Boundary Descriptions and Names of Regions, Subregions,
                 Accounting Units and Cataloging Units


Region 01  New England Region -- The drainage within the United States
           that ultimately discharges into: (a) the Bay of Fundy; (b)
           the Atlantic Ocean within and between the states of Maine
           and Connecticut; (c) Long Island Sound north of the New
           York-Connecticut state line; and (d) the Riviere St. Francois,
           a tributary of the St. Lawrence River. Includes all of Maine,
           New Hampshire and Rhode Island and parts of Connecticut,
           Massachusetts, New York, and Vermont.


  Subregion  0101 -- St. John: The St. John River Basin within the
                     United States. Maine.
                       Area =     7330 sq.mi.

    Accounting Unit 010100 -- St. John. Maine.
                                Area =     7330 sq.mi.

      Cataloging Units  01010001 -- Upper St. John. Maine.
                                      Area =     2120 sq.mi.
                        01010002 -- Allagash. Maine.
                                      Area =     1250 sq.mi.
                        01010003 -- Fish. Maine.
                                      Area =      908 sq.mi.
                        01010004 -- Aroostook. Maine.
                                      Area =     2420 sq.mi.
                        01010005 -- Meduxnekeag. Maine.
                                      Area =      634 sq.mi.


  Subregion  0102 -- Penobscot: The Penobscot River Basin. Maine.
                       Area =     8610 sq.mi.

    Accounting Unit 010200 -- Penobscot. Maine.
                                Area =     8610 sq.mi.

      Cataloging Units  01020001 -- West Branch Penobscot. Maine.
                                      Area =     2150 sq.mi.
                        01020002 -- East Branch Penobscot. Maine.
                                      Area =     1130 sq.mi.
                        01020003 -- Mattawamkeag. Maine.
                                      Area =     1510 sq.mi.
                        01020004 -- Piscataquis. Maine.
                                      Area =     1460 sq.mi.
                        01020005 -- Lower Penobscot. Maine.
                                      Area =     2360 sq.mi.

  Subregion  0103 -- Kennebec: The Kennebec River Basin,
                     including part of Merrymeeting Bay. Maine.
                       Area =     5900 sq.mi.

    Accounting Unit 010300 -- Kennebec. Maine.
                                Area =     5900 sq.mi.

      Cataloging Units  01030001 -- Upper Kennebec. Maine.
                                      Area =     1570 sq.mi.
                        01030002 -- Dead. Maine.
                                      Area =      878 sq.mi.
                        01030003 -- Lower Kennebec. Maine.
                                      Area =     3450 sq.mi.


  Subregion  0104 -- Androscoggin: The Androscoggin River Basin,
                     including part of Merrymeeting Bay. Maine,
                     New Hampshire.
                       Area =     3530 sq.mi.

    Accounting Unit 010400 -- Androscoggin. Maine, New Hampshire.
                                Area =     3530 sq.mi.

      Cataloging Units  01040001 -- Upper Androscoggin. Maine,
                                    New Hampshire.
                                      Area =     1470 sq.mi.
                        01040002 -- Lower Androscoggin. Maine,
                                    New Hampshire.
                                      Area =     2060 sq.mi.


  Subregion  0105 -- Maine Coastal: The coastal drainage and associated
                     waters from the Maine-New Brunswick international
                     boundary to Cape Small, Maine, including the
                     St. Croix River Basin within the United States.
                     Maine.
                       Area =     7130 sq.mi.

    Accounting Unit 010500 -- Maine Coastal. Maine.
                                Area =     7130 sq.mi.

      Cataloging Units  01050001 -- St. Croix. Maine.
                                      Area =      999 sq.mi.
                        01050002 -- Maine Coastal. Maine.
                                      Area =     4880 sq.mi.
                        01050003 -- St. George-Sheepscot. Maine.
                                      Area =     1250 sq.mi.


  Subregion  0106 -- Saco: The coastal drainage and associated waters
                     from Cape Small, Maine to the Merrimack River
                     Basin Boundary. Maine, New Hampshire,
                     Massachusetts.
                       Area =     4330 sq.mi.

    Accounting Unit 010600 -- Saco. Maine, New Hampshire, Massachusetts.
                                Area =     4330 sq.mi.

      Cataloging Units  01060001 -- Presumpscot. Maine.
                                      Area =     1240 sq.mi.
                        01060002 -- Saco. Maine, New Hampshire.
                                      Area =     1690 sq.mi.
                        01060003 -- Piscataqua-Salmon Falls. Maine,
                                    New Hampshire, Massachusetts.
                                      Area =     1400 sq.mi.


  Subregion  0107 -- Merrimack: The Merrimack River Basin.
                     Massachusetts, New Hampshire.
                       Area =     4980 sq.mi.

    Accounting Unit 010700 -- Merrimack. Massachusetts, New Hampshire.
                                Area =     4980 sq.mi.

      Cataloging Units  01070001 -- Pemigewasset. New Hampshire.
                                      Area =     1000 sq.mi.
                        01070002 -- Merrimack. Massachusetts,
                                    New Hampshire.
                                      Area =     2300 sq.mi.
                        01070003 -- Contoocook. New Hampshire.
                                      Area =      757 sq.mi.
                        01070004 -- Nashua. Massachusetts,
                                    New Hampshire.
                                      Area =      525 sq.mi.
                        01070005 -- Concord. Massachusetts.
                                      Area =      401 sq.mi.


  Subregion  0108 -- Connecticut: The Connecticut River Basin.
                     Connecticut, Massachusetts, New Hampshire,
                     Vermont.
                       Area =    11100 sq.mi.

    Accounting Unit 010801 -- Upper Connecticut: The Connecticut River
                              Basin above Vernon Dam. New Hamsphire,
                              Vermont.
                                Area =     6120 sq.mi.


    Cataloging Units    01080101 -- Upper Connecticut. New Hampshire,
                                    Vermont.
                                      Area =     1990 sq.mi.
                        01080102 -- Passumpsic. Vermont.
                                      Area =      496 sq.mi.
                        01080103 -- Waits. Vermont.
                                      Area =      441 sq.mi.
                        01080104 -- Upper Connecticut-Mascoma.
                                    New Hampshire, Vermont.
                                      Area =     1460 sq.mi.
                        01080105 -- White. Vermont.
                                      Area =      703 sq.mi.
                        01080106 -- Black-Ottauquechee. Vermont.
                                      Area =      418 sq.mi.
                        01080107 -- West. Vermont.
                                      Area =      612 sq.mi.

    Accounting Unit 010802 -- Lower Connecticut: The Connecticut River
                              Basin below Vernon Dam. Connecticut,
                              Massachusetts, New Hampshire, Vermont.
                                Area =     4960 sq.mi.

      Cataloging Units  01080201 -- Middle Connecticut. Massachusetts,
                                    New Hampshire, Vermont.
                                      Area =      999 sq.mi.
                        01080202 -- Miller. Massachusetts,
                                    New Hampshire.
                                      Area =      391 sq.mi.
                        01080203 -- Deerfield. Massachusetts, Vermont.
                                      Area =      658 sq.mi.
                        01080204 -- Chicopee. Massachusetts.
                                      Area =      725 sq.mi.
                        01080205 -- Lower Connecticut. Connecticut,
                                    Massachusetts.
                                      Area =     1090 sq.mi.
                        01080206 -- Westfield. Connecticut,
                                    Massachusetts.
                                      Area =      505 sq.mi.
                        01080207 -- Farmington. Connecticut,
                                    Massachusetts.
                                      Area =      590 sq.mi.


  Subregion  0109 -- Massachusetts-Rhode Island Coastal: The coastal
                     drainage and associated waters from the Merrimack
                     River Basin boundary to and including the
                     Pawcatuck River Basin. Connecticut, Massachusetts,
                     Rhode Island.
                       Area =     5510 sq.mi.

    Accounting Unit 010900 -- Massachusetts-Rhode Island Coastal.
                              Connecticut, Massachusetts, Rhode Island.
                                Area =     5510 sq.mi.

      Cataloging Units  01090001 -- Charles. Massachusetts.
                                      Area =     1130 sq.mi.
                        01090002 -- Cape Cod. Massachusetts,
                                    Rhode Island.
                                      Area =     2220 sq.mi.
                        01090003 -- Blackstone. Massachusetts,
                                    Rhode Island.
                                      Area =      451 sq.mi.
                        01090004 -- Narragansett. Massachusetts,
                                    Rhode Island.
                                      Area =     1330 sq.mi.
                        01090005 -- Pawcatuck-Wood. Connecticut,
                                    Rhode Island.
                                      Area =      383 sq.mi.


  Subregion  0110 -- Connecticut Coastal: The coastal drainage into
                     Long Island Sound from the Pawcatuck River Basin
                     boundary to and including the Byram River Basin,
                     excluding the Connecticut River Basin,
                     and including Long Island Sound north of the
                     New York-Connecticut state line. Connecticut,
                     Massachusetts, New York, Rhode Island.
                       Area =     5080 sq.mi.

    Accounting Unit 011000 -- Connecticut Coastal. Connecticut,
                              Massachusetts, New York, Rhode Island.
                                Area =     5080 sq.mi.

      Cataloging Units  01100001 -- Quinebaug. Connecticut,
                                    Massachusetts, Rhode Island.
                                      Area =      729 sq.mi.
                        01100002 -- Shetucket. Connecticut,
                                    Massachusetts.
                                      Area =      517 sq.mi.
                        01100003 -- Thames. Connecticut.
                                      Area =      381 sq.mi.
                        01100004 -- Quinnipiac. Connecticut.
                                      Area =      516 sq.mi.
                        01100005 -- Housatonic. Connecticut,
                                    Massachusetts, New York.
                                      Area =     1930 sq.mi.
                        01100006 -- Saugatuck. Connecticut, New York.
                                      Area =      436 sq.mi.
                        01100007 -- Long Island Sound. Connecticut.
                                      Area =      568 sq.mi.


  Subregion  0111 -- St. Francois: The Riviere St. Francois Basin within
                     the United States. Vermont.
                       Area =      590 sq.mi.

    Accounting Unit 011100 -- St. Francois. Vermont.
                                Area =      590 sq.mi.

      Cataloging Unit   01110000 -- St. Francois. Vermont.
                                      Area =      590 sq.mi.


Region 02  Mid-Atlantic Region -- The drainage within the United States
           that ultimately discharges into: (a) the Atlantic Ocean
           within and between the states of New York and Virginia; (b)
           Long Island Sound south of the New York-Connecticut State
           Line; and (c) the Riviere Richelieu, a tributary of the St.
           Lawrence River. Includes all of Delaware and New Jersey and
           the District of Columbia, and parts of Connecticut, Maryland,
           Massachusetts, New York, Pennsylvania, Vermont, Virginia, and
           West Virginia.


  Subregion  0201 -- Richelieu: The Riviere Richelieu Basin, including
                     Lake Champlain drainage, within the United States.
                     New York, Vermont.
                       Area =     7720 sq.mi.

    Accounting Unit 020100 -- Richelieu. New York, Vermont.
                                Area =     7720 sq.mi.

      Cataloging Units  02010001 -- Lake George. New York, Vermont.
                                      Area =     1390 sq.mi.
                        02010002 -- Otter. Vermont.
                                      Area =     1090 sq.mi.
                        02010003 -- Winooski. Vermont.
                                      Area =     1220 sq.mi.
                        02010004 -- Ausable. New York.
                                      Area =     1070 sq.mi.
                        02010005 -- Lamoille. Vermont.
                                      Area =     1130 sq.mi.
                        02010006 -- Great Chazy-Saranac. New York.
                                      Area =     1110 sq.mi.
                        02010007 -- Missisquoi. Vermont.
                                      Area =      707 sq.mi.


  Subregion  0202 -- Upper Hudson: The Hudson River Basin to and
                     including the Popolopen Brook Basin just upstream
                     from Bear Mountain Bridge. New Jersey, New York,
                     Massachusetts, Vermont.
                       Area =    12500 sq.mi.

    Accounting Unit 020200 -- Upper Hudson. New Jersey, New York,
                              Massachusetts, Vermont.
                                Area =    12500 sq.mi.

      Cataloging Units  02020001 -- Upper Hudson. New York.
                                      Area =     1630 sq.mi.
                        02020002 -- Sacandaga. New York.
                                      Area =     1050 sq.mi.
                        02020003 -- Hudson-Hoosic. New York,
                                    Massachusetts, Vermont.
                                      Area =     1880 sq.mi.
                        02020004 -- Mohawk. New York.
                                      Area =     2550 sq.mi.
                        02020005 -- Schoharie. New York.
                                      Area =      927 sq.mi.
                        02020006 -- Middle Hudson. Massachusetts,
                                    New York.
                                      Area =     2390 sq.mi.
                        02020007 -- Rondout. New Jersey, New York.
                                      Area =     1190 sq.mi.
                        02020008 -- Hudson-Wappinger. New York.
                                      Area =      928 sq.mi.


  Subregion  0203 -- Lower Hudson-Long Island: The coastal drainage and
                     associated waters from the Byram River Basin
                     boundary, to the Manasquan River Basin boundary,
                     including the Hudson River Basin downstream from
                     the Popolopen Brook Basin boundary, Long Island
                     and Block Island Sounds south of the New York-
                     Connecticut state line, and Long Island.
                     Connecticut, New Jersey, New York.
                       Area =     6360 sq.mi.

    Accounting Unit 020301 -- Lower Hudson: The coastal drainage and
                              associated waters from the Byram River
                              Basin boundary, to the Manasquan River
                              Basin boundary, including the Hudson
                              River Basin downstream from the Popolopen
                              Brook Basin boundary, and Long Island
                              Sound in Westchester and Bronx Counties,
                              New York, but excluding Long Island and
                              Block Island Sounds south of the New York-
                              Connecticut state line and Long Island.
                              Connecticut, New Jersey, New York.
                                Area =     3790 sq.mi.

      Cataloging Units  02030101 -- Lower Hudson. Connecticut, New
                                    Jersey, New York.
                                      Area =      720 sq.mi.
                        02030102 -- Bronx. New York.
                                      Area =      190 sq.mi.
                        02030103 -- Hackensack-Passaic. New Jersey,
                                    New York.
                                      Area =     1120 sq.mi.
                        02030104 -- Sandy Hook-Staten Island.
                                    New Jersey, New York.
                                      Area =      679 sq.mi.
                        02030105 -- Raritan. New Jersey.
                                      Area =     1080 sq.mi.

    Accounting Unit 020302 -- Long Island: Long Island and Long Island
                              and Block Island Sounds south of the New
                              York-Connecticut state line, but excluding
                              Long Island Sound in Westchester and Bronx
                              Counties, New York. New York.
                                Area =     2580 sq.mi.

      Cataloging Units  02030201 -- Northern Long Island. New York.
                                      Area =      915 sq.mi.
                        02030202 -- Southern Long Island. New York.
                                      Area =     1660 sq.mi.


  Subregion  0204 -- Delaware: The coastal drainage and associated waters
                     from and including the Manasquan River Basin to and
                     including the Delaware River Basin which includes
                     Delaware Bay. Delaware, Maryland, New Jersey,
                     New York, Pennsylvania.
                       Area =     15500 sq.mi.

    Accounting Unit 020401 -- Upper Delaware: The Delaware River Basin
                              upstream from the fall line (highest tidal
                              effect of the Delaware River) at Trenton,
                              New Jersey. New Jersey, New York,
                              Pennsylvania.
                                Area =     6800 sq.mi.

      Cataloging Units  02040101 -- Upper Delaware. New York,
                                    Pennsylvania.
                                      Area =     1180 sq.mi.
                        02040102 -- East Branch Delaware. New York.
                                      Area =      828 sq.mi.
                        02040103 -- Lackawaxen. Pennsylvania.
                                      Area =      587 sq.mi.
                        02040104 -- Middle Delaware-Mongaup-Brodhead.
                                    New Jersey, New York, Pennsylvania.
                                      Area =     1520 sq.mi.
                        02040105 -- Middle Delaware-Musconetcong. New
                                    Jersey, Pennsylvania.
                                      Area =     1330 sq.mi.
                        02040106 -- Lehigh. Pennsylvania.
                                      Area =     1350 sq.mi.

    Accounting Unit 020402 -- Lower Delaware: The Delaware River Basin
                              downstream from the fall line at Trenton,
                              New Jersey, including Delaware Bay.
                              Delaware, Maryland, New Jersey,
                              Pennsylvania.
                                Area =     6650 sq.mi.

      Cataloging Units  02040201 -- Crosswicks-Neshaminy. New Jersey,
                                    Pennsylvania.
                                      Area =      521 sq.mi.
                        02040202 -- Lower Delaware. New Jersey,
                                    Pennsylvania.
                                      Area =     1050 sq.mi.
                        02040203 -- Schuylkill. Pennsylvania.
                                      Area =     1900 sq.mi.
                        02040204 -- Delaware Bay. New Jersey.
                                      Area =      744 sq.mi.
                        02040205 -- Brandywine-Christina. Delaware,
                                    Maryland, Pennsylvania.
                                      Area =      745 sq.mi.
                        02040206 -- Cohansey-Maurice. New Jersey.
                                      Area =     1060 sq.mi.
                        02040207 -- Broadkill-Smyrna. Delaware.
                                      Area =      628 sq.mi.

    Accounting Unit 020403 -- New Jersey Coastal: The coastal drainage
                              in New Jersey from and including the
                              Manasquan River Basin to the Delaware Bay
                              drainage boundary. New Jersey.
                                Area =     2070 sq.mi.

      Cataloging Units  02040301 -- Mullica-Toms. New Jersey
                                      Area =     1350 sq.mi.
                        02040302 -- Great Egg Harbor. New Jersey.
                                      Area =      717 sq.mi.


  Subregion  0205 -- Susquehanna: The Susquehanna River Basin. Maryland,
                     New York, Pennsylvania.
                       Area =    27200 sq.mi.

    Accounting Unit 020501 -- Upper Susquehanna: The Susquehanna River
                              Basin above the confluence with the West
                              Branch Susquenhanna River Basin. New York,
                              Pennsylvania.
                                Area =   11200 sq.mi.

      Cataloging Units  02050101 -- Upper Susquehanna. New York,
                                    Pennsylvania.
                                      Area =     2260 sq.mi.
                        02050102 -- Chenango. New York.
                                      Area =     1580 sq.mi.
                        02050103 -- Owego-Wappasening. New York,
                                    Pennsylvania.
                                      Area =     1040 sq.mi.
                        02050104 -- Tioga. New York, Pennsylvania.
                                      Area =     1370 sq.mi.

                        02050105 -- Chemung. New York, Pennsylvania.
                                      Area =     1200 sq.mi.
                        02050106 -- Upper Susquehanna-Tunkhannock.
                                    Pennsylvania.
                                      Area =     1980 sq.mi.
                        02050107 -- Upper Susquehanna-Lackawanna.
                                    Pennsylvania.
                                      Area =     1760 sq.mi.

    Accounting Unit 020502 -- West Branch Susquehanna: The West Branch
                              Susquehanna River Basin.
                              Pennsylvania.
                                Area =     6920 sq.mi.

      Cataloging Units  02050201 -- Upper West Branch Susquehanna.
                                    Pennsylvania.
                                      Area =     1590 sq.mi.
                        02050202 -- Sinnemahoning. Pennsylvania.
                                      Area =     1020 sq.mi.
                        02050203 -- Middle West Branch Susquehanna.
                                    Pennsylvania.
                                      Area =      768 sq.mi.
                        02050204 -- Bald Eagle. Pennsylvania.
                                      Area =      765 sq.mi.
                        02050205 -- Pine. Pennsylvania.
                                      Area =      970 sq.mi.
                        02050206 -- Lower West Branch Susquehanna.
                                    Pennsylvania.
                                      Area =     1810 sq.mi.

    Accounting Unit 020503 -- Lower Susquehanna: The Susquehanna River
                              Basin below the confluence with the West
                              Branch Susquehanna River Basin. Maryland,
                              Pennsylvania.
                                Area =     9080 sq.mi.

      Cataloging Units  02050301 -- Lower Susquehanna-Penns.
                                    Pennsylvania.
                                      Area =     1430 sq.mi.
                        02050302 -- Upper Juniata. Pennsylvania.
                                      Area =      973 sq.mi.
                        02050303 -- Raystown. Pennsylvania.
                                      Area =      937 sq.mi.
                        02050304 -- Lower Juniata. Pennsylvania.
                                      Area =     1450 sq.mi.
                        02050305 -- Lower Susquehanna-Swatara.
                                    Pennsylvania.
                                      Area =     1850 sq.mi.
                        02050306 -- Lower Susquehanna. Maryland,
                                    Pennsylvania.
                                      Area =     2440 sq.mi.


  Subregion  0206 -- Upper Chesapeake: The Chesapeake Bay and its
                     tributary drainage north of the Maryland-Virginia
                     state line including the Pocomoke River drainage,
                     excluding the Susquehanna and Potomac River Basins;
                     and the Coastal drainage from the Delaware Bay
                     drainage boundary to Chincoteague Inlet on the
                     Delmarva Peninsula. Delaware, Maryland, Virginia,
                     and Pennsylvania.
                       Area =     8980 sq.mi.

    Accounting Unit 020600 -- Upper Chesapeake. Delaware, Maryland,
                              Virginia, and Pennsylvania.
                                Area =     8980 sq.mi.

      Cataloging Units  02060001 -- Upper Chesapeake Bay. Maryland.
                                      Area =     1270 sq.mi.
                        02060002 -- Chester-Sassafras. Delaware,
                                    Maryland, Pennsylvania.
                                      Area =     1290 sq.mi.
                        02060003 -- Gunpowder-Patapsco. Maryland,
                                    Pennsylvania.
                                      Area =     1370 sq.mi.
                        02060004 -- Severn. Maryland.
                                      Area =      325 sq.mi.
                        02060005 -- Choptank. Delaware, Maryland.
                                      Area =      931 sq.mi.
                        02060006 -- Patuxent. Maryland.
                                      Area =      922 sq.mi.
                        02060007 -- Blackwater-Wicomico. Delaware,
                                    Maryland.
                                      Area =      537 sq.mi.
                        02060008 -- Nanticoke. Delaware, Maryland.
                                      Area =      821 sq.mi.
                        02060009 -- Pocomoke. Delaware, Maryland,
                                    Virginia.
                                      Area =      771 sq.mi.
                        02060010 -- Chincoteague. Delaware, Maryland,
                                    Virginia.
                                      Area =      742 sq.mi.


  Subregion  0207 -- Potomac: The Potomac River Basin. District of
                     Columbia, Maryland, Pennsylvania, Virginia, West
                     Virginia.
                       Area =    14600 sq.mi.

    Accounting Unit 020700 -- Potomac. District of Columbia, Maryland,
                              Pennsylvania, Virginia, West Virginia.
                                Area =    14600 sq.mi.

      Cataloging Units  02070001 -- South Branch Potomac. West Virginia,
                                    Virginia.
                                      Area =     1490 sq.mi.
                        02070002 -- North Branch Potomac. Maryland, West
                                    Virginia, Pennsylvania.
                                      Area =     1360 sq.mi.
                        02070003 -- Cacapon-Town. Maryland,
                                    Pennsylvania, West Virginia.
                                      Area =     1200 sq.mi.
                        02070004 -- Conococheague-Opequon. Maryland,
                                    Pennsylvania, Virginia,
                                    West Virginia.
                                      Area =     2250 sq.mi.
                        02070005 -- South Fork Shenandoah. Virginia.
                                      Area =     1660 sq.mi.
                        02070006 -- North Fork Shenandoah. Virginia,
                                    West Virginia.
                                      Area =     1040 sq.mi.
                        02070007 -- Shenandoah. Virginia, West Virginia.
                                      Area =      359 sq.mi.
                        02070008 -- Middle Potomac-Catoctin.
                                    District of Columbia, Virginia,
                                    Maryland.
                                      Area =     1210 sq.mi.
                        02070009 -- Monocacy. Maryland, Pennsylvania.
                                      Area =      962 sq.mi.
                        02070010 -- Middle Potomac-Anacostia-Occoquan.
                                    District of Columbia, Maryland,
                                    Virginia.
                                      Area =     1280 sq.mi.
                        02070011 -- Lower Potomac. Maryland, Virginia.
                                      Area =     1800 sq.mi.


  Subregion  0208 -- Lower Chesapeake: The Chesapeake Bay and its
                     tributary drainage south of the Maryland-Virginia
                     state line excluding the Pocomoke River drainage;
                     and the Coastal drainage from Chincoteague Inlet on
                     the Delmarva Peninsula to the Back Bay drainage
                     boundary. Virginia, West Virginia.
                       Area =    18500 sq.mi.

    Accounting Unit 020801 -- Lower Chesapeake.--The Chesapeake Bay and
                              its tributary drainage south of the
                              Maryland-Virginia state line excluding the
                              Pocomoke River drainage, and excluding the
                              James River Basin; and the Coastal drainage
                              from Chincoteague Inlet on the Delmarva
                              Peninsula to the Back Bay drainage
                              boundary. Virginia.
                                Area =     8320 sq.mi.

      Cataloging Units  02080101 -- Lower Chesapeake Bay. Virginia.
                                      Area =     1390 sq.mi.
                        02080102 -- Great Wicomico-Piankatank. Virginia.
                                      Area =      605 sq.mi.
                        02080103 -- Rapidan-Upper Rappahannock.
                                    Virginia.
                                      Area =     1530 sq.mi.
                        02080104 -- Lower Rappahannock. Virginia.
                                      Area =     1160 sq.mi.
                        02080105 -- Mattaponi. Virginia.
                                      Area =      901 sq.mi.
                        02080106 -- Pamunkey. Virginia.
                                      Area =     1450 sq.mi.
                        02080107 -- York. Virginia.
                                      Area =      275 sq.mi.
                        02080108 -- Lynnhaven-Poquoson. Virginia.
                                      Area =      213 sq.mi.
                        02080109 -- Western Lower Delmarva. Virginia.
                                      Area =      338 sq.mi.
                        02080110 -- Eastern Lower Delmarva. Virginia.
                                      Area =      457 sq.mi.

    Accounting Unit 020802 -- James: The James River Basin. Virginia,
                              West Virginia.
                                Area =    10200 sq.mi.

      Cataloging Units  02080201 -- Upper James. Virginia,
                                    West Virginia.
                                      Area =     2210 sq.mi.
                        02080202 -- Maury. Virginia.
                                      Area =      818 sq.mi.
                        02080203 -- Middle James-Buffalo. Virginia.
                                      Area =     1990 sq.mi.
                        02080204 -- Rivanna. Virginia.
                                      Area =      758 sq.mi.
                        02080205 -- Middle James-Willis. Virginia.
                                      Area =      948 sq.mi.
                        02080206 -- Lower James. Virginia.
                                      Area =     1440 sq.mi.
                        02080207 -- Appomattox. Virginia.
                                      Area =     1590 sq.mi.
                        02080208 -- Hampton Roads. Virginia.
                                      Area =      425 sq.mi.


Region 03  South Atlantic-Gulf Region--The drainage that ultimately
           discharges into: (a) the Atlantic Ocean within and between
           the states of Virginia and Florida; (b) the Gulf of Mexico
           within and between the states of Florida and Louisiana; and
           (c) the associated waters. Includes all of Florida and South
           Carolina, and parts of Alabama, Georgia, Louisiana,
           Mississippi, North Carolina, Tennessee, and Virginia.


  Subregion  0301 -- Chowan-Roanoke: The coastal drainage and
                     associated waters from and including the Back Bay
                     drainage to Oregon Inlet. Virginia, North Carolina.
                       Area =    18300 sq.mi.

    Accounting Unit 030101 -- Roanoke: The Roanoke River Basin.
                              North Carolina, Virginia.
                                Area =     9680 sq.mi.

      Cataloging Units  03010101 -- Upper Roanoke. Virginia.
                                      Area =     2180 sq.mi.
                        03010102 -- Middle Roanoke. North Carolina,
                                    Virginia.
                                      Area =     1750 sq.mi.
                        03010103 -- Upper Dan. North Carolina,
                                    Virginia.
                                      Area =     2040 sq.mi.
                        03010104 -- Lower Dan. North Carolina,
                                    Virginia.
                                      Area =     1240 sq.mi.
                        03010105 -- Banister. Virginia.
                                      Area =      590 sq.mi.
                        03010106 -- Roanoke Rapids. North Carolina,
                                    Virginia.
                                      Area =      590 sq.mi.
                        03010107 -- Lower Roanoke. North Carolina.
                                      Area =     1290 sq.mi.

    Accounting Unit 030102 -- Albemarle-Chowan: The coastal drainage
                              and associated waters from and including
                              the Back Bay drainage to Oregon Inlet,
                              excluding the Roanoke River Basin.
                              North Carolina, Virginia.
                                Area =     8650 sq.mi.

      Cataloging Units  03010201 -- Nottoway. North Carolina, Virginia.
                                      Area =     1700 sq.mi.
                        03010202 -- Blackwater. North Carolina,
                                    Virginia.
                                      Area =      744 sq.mi.
                        03010203 -- Chowan. North Carolina, Virginia.
                                      Area =      857 sq.mi.
                        03010204 -- Meherrin. North Carolina,
                                    Virginia.
                                      Area =     1600 sq.mi.
                        03010205 -- Albemarle. North Carolina,
                                    Virginia.
                                      Area =     3750 sq.mi.


  Subregion  0302 -- Neuse-Pamlico: The coastal drainage and
                     associated waters from Oregon Inlet to Browns
                     Inlet. North Carolina.
                       Area =    13100 sq.mi.

    Accounting Unit 030201 -- Pamlico: The coastal drainage and
                              associated waters from Oregon Inlet to
                              Browns Inlet, excluding the Neuse River
                              Basin. North Carolina.
                                Area =     7470 sq.mi.

      Cataloging Units  03020101 -- Upper Tar. North Carolina.
                                      Area =     1280 sq.mi.
                        03020102 -- Fishing. North Carolina
                                      Area =      876 sq.mi.
                        03020103 -- Lower Tar. North Carolina.
                                      Area =      967 sq.mi.
                        03020104 -- Pamlico. North Carolina
                                      Area =     1140 sq.mi.
                        03020105 -- Pamlico Sound. North Carolina.
                                      Area =     2060 sq.mi.
                        03020106 -- Bogue-Core Sounds. North Carolina.
                                      Area =     1150 sq.mi.

    Accounting Unit 030202 -- Neuse: The Neuse River Basin.
                              North Carolina.
                                Area =     5590 sq.mi.

      Cataloging Units  03020201 -- Upper Neuse. North Carolina.
                                      Area =     2380 sq.mi.
                        03020202 -- Middle Neuse. North Carolina.
                                      Area =     1080 sq.mi.
                        03020203 -- Contentnea. North Carolina.
                                      Area =     1010 sq.mi.
                        03020204 -- Lower Neuse. North Carolina.
                                      Area =     1120 sq.mi.


  Subregion  0303 -- Cape Fear: The coastal drainage and associated
                     waters from Browns Inlet to and including the Cape
                     Fear River Basin. North Carolina.
                       Area =     9700 sq.mi.

    Accounting Unit 030300 -- Cape Fear. North Carolina.
                                Area =    9700 sq.mi.

      Cataloging Units  03030001 -- New. North Carolina.
                                      Area =      613 sq.mi.
                        03030002 -- Haw. North Carolina.
                                      Area =     1690 sq.mi.
                        03030003 -- Deep. North Carolina.
                                      Area =     1430 sq.mi.
                        03030004 -- Upper Cape Fear. North Carolina.
                                      Area =     1630 sq.mi.
                        03030005 -- Lower Cape Fear. North Carolina.
                                      Area =     1030 sq.mi.
                        03030006 -- Black. North Carolina.
                                      Area =     1570 sq.mi.
                        03030007 -- Northeast Cape Fear. North Carolina.
                                      Area =     1740 sq.mi.


  Subregion  0304 -- Pee Dee: The coastal drainage and associated
                     waters from the Cape Fear River Basin boundary to
                     the Santee River Basin boundary.
                     North Carolina, South Carolina, Virginia.
                       Area =    18500 sq.mi.

    Accounting Unit 030401 -- Upper Pee Dee: The Pee Dee River Basin
                              above Blewett Falls Lake Dam.
                              North Carolina, South Carolina, Virginia.
                                Area =     6800 sq.mi.

      Cataloging Units  03040101 -- Upper Yadkin. North Carolina,
                                    Virginia.
                                      Area =     2420 sq.mi.
                        03040102 -- South Yadkin. North Carolina.
                                      Area =      915 sq.mi.
                        03040103 -- Lower Yadkin. North Carolina.
                                      Area =     1180 sq.mi.
                        03040104 -- Upper Pee Dee. North Carolina,
                                    South Carolina.
                                      Area =      861 sq.mi.
                        03040105 -- Rocky. North Carolina,
                                    South Carolina.
                                      Area =     1420 sq.mi.

    Accounting Unit 030402 -- Lower Pee Dee: The coastal drainage and
                              associated waters from the Cape Fear
                              River Basin boundary to the Santee River
                              Basin boundary, excluding the Pee Dee
                              River Basin above Blewett Falls Dam.
                              North Carolina, South Carolina.
                                Area =    11700 sq.mi.


      Cataloging Units  03040201 -- Lower Pee Dee. North Carolina,
                                    South Carolina.
                                      Area =     2830 sq.mi.
                        03040202 -- Lynches. North Carolina,
                                    South Carolina.
                                      Area =     1390 sq.mi.
                        03040203 -- Lumber. North Carolina,
                                    South Carolina.
                                      Area =     1750 sq.mi.
                        03040204 -- Little Pee Dee. North Carolina,
                                    South Carolina.
                                      Area =     1340 sq.mi.
                        03040205 -- Black. South Carolina.
                                      Area =     2040 sq.mi.
                        03040206 -- Waccamaw. North Carolina,
                                    South Carolina.
                                      Area =     1640 sq.mi.
                        03040207 -- Carolina Coastal-Sampit.
                                    North Carolina, South Carolina.
                                      Area =      682 sq.mi.


  Subregion  0305 -- Edisto-Santee: The coastal drainage and associated
                     waters from and including the Santee River Basin to
                     the Savannah River Basin boundary. Georgia,
                     North Carolina, South Carolina.
                       Area =    23600 sq.mi.

    Accounting Unit 030501 -- Santee: The Santee River Basin.
                              North Carolina, South Carolina.
                                Area =    15300 sq.mi.

      Cataloging Units  03050101 -- Upper Catawba. North Carolina,
                                    South Carolina.
                                      Area =     2350 sq.mi.
                        03050102 -- South Fork Catawba.
                                    North Carolina.
                                      Area =      657 sq.mi.
                        03050103 -- Lower Catawba. North Carolina,
                                    South Carolina.
                                      Area =     1370 sq.mi.
                        03050104 -- Wateree. South Carolina.
                                      Area =     1210 sq.mi.
                        03050105 -- Upper Broad. North Carolina,
                                    South Carolina.
                                      Area =     2480 sq.mi.
                        03050106 -- Lower Broad. South Carolina.
                                      Area =     1290 sq.mi.
                        03050107 -- Tyger. South Carolina.
                                      Area =      809 sq.mi.
                        03050108 -- Enoree. South Carolina.
                                      Area =      731 sq.mi.
                        03050109 -- Saluda. South Carolina.
                                      Area =     2480 sq.mi.
                        03050110 -- Congaree. South Carolina.
                                      Area =      708 sq.mi.
                        03050111 -- Lake Marion. South Carolina.
                                      Area =      543 sq.mi.
                        03050112 -- Santee. South Carolina.
                                      Area =      718 sq.mi.

    Accounting Unit 030502 -- Edisto-South Carolina Coastal: The
                              Coastal drainage and associated waters
                              from the Santee River Basin boundary to
                              the Savannah River Basin boundary.
                              South Carolina.
                                Area =     8210 sq.mi.

      Cataloging Units  03050201 -- Cooper. South Carolina.
                                      Area =      837 sq.mi.
                        03050202 -- South Carolina Coastal.
                                    South Carolina.
                                      Area =      955 sq.mi.
                        03050203 -- North Fork Edisto. South Carolina.
                                      Area =      750 sq.mi.
                        03050204 -- South Fork Edisto. South Carolina.
                                      Area =      865 sq.mi.
                        03050205 -- Edisto. South Carolina.
                                      Area =      846 sq.mi.
                        03050206 -- Four Hole Swamp. South Carolina.
                                      Area =      627 sq.mi.
                        03050207 -- Salkehatchie. South Carolina.
                                      Area =     1000 sq.mi.
                        03050208 -- Broad-St. Helena. South Carolina.
                                      Area =     2330 sq.mi.


  Subregion  0306 -- Ogeechee-Savannah: The coastal drainage and
                     associated waters from and including the Savannah
                     River Basin to the Altamaha River Basin boundary.
                     Georgia, North Carolina, South Carolina.
                       Area =    16300 sq.mi.

    Accounting Unit 030601 -- Savannah: The Savannah River Basin.
                              Georgia, North Carolina, South Carolina.
                                Area =    10400 sq.mi.

      Cataloging Units  03060101 -- Seneca. North Carolina,
                                    South Carolina.
                                      Area =     1020 sq.mi.
                        03060102 -- Tugaloo. Georgia, North Carolina,
                                    South Carolina.
                                      Area =      995 sq.mi.
                        03060103 -- Upper Savannah. Georgia,
                                    South Carolina.
                                      Area =     1830 sq.mi.
                        03060104 -- Broad. Georgia.
                                      Area =     1500 sq.mi.
                        03060105 -- Little. Georgia.
                                      Area =      766 sq.mi.
                        03060106 -- Middle Savannah. Georgia,
                                    South Carolina.
                                      Area =     1850 sq.mi.
                        03060107 -- Stevens. South Carolina.
                                      Area =      734 sq.mi.
                        03060108 -- Brier. Georgia.
                                      Area =      830 sq.mi.
                        03060109 -- Lower Savannah. Georgia,
                                    South Carolina.
                                      Area =      916 sq.mi.

    Accounting Unit 030602 -- Ogeechee: The coastal drainage and
                              associated waters from the Savannah River
                              Basin boundary to the Altamaha River Basin
                              boundary. Georgia.
                                Area =     5830 sq.mi.

      Cataloging Units  03060201 -- Upper Ogeechee. Georgia.
                                      Area =     1820 sq.mi.
                        03060202 -- Lower Ogeechee. Georgia.
                                      Area =     1220 sq.mi.
                        03060203 -- Canoochee. Georgia.
                                      Area =     1420 sq.mi.
                        03060204 -- Ogeechee Coastal. Georgia.
                                      Area =     1370 sq.mi.


  Subregion  0307 -- Altamaha - St. Marys: The coastal drainage and
                     associated waters from and including the
                     Altamaha River Basin to the St. Johns River Basin
                     boundary. Florida, Georgia.
                       Area =    20500 sq.mi.

    Accounting Unit 030701 -- Altamaha: The Altamaha River Basin.
                              Georgia.
                                Area =    14200 sq.mi.

      Cataloging Units  03070101 -- Upper Oconee. Georgia.
                                      Area =     2920 sq.mi.
                        03070102 -- Lower Oconee. Georgia.
                                      Area =     2400 sq.mi.
                        03070103 -- Upper Ocmulgee. Georgia.
                                      Area =     2980 sq.mi.
                        03070104 -- Lower Ocmulgee. Georgia.
                                      Area =     2280 sq.mi.
                        03070105 -- Little Ocmulgee. Georgia.
                                      Area =      818 sq.mi.
                        03070106 -- Altamaha. Georgia.
                                      Area =     1510 sq.mi.
                        03070107 -- Ohoopee. Georgia.
                                      Area =     1340 sq.mi.

    Accounting Unit 030702 -- St. Marys - Satilla: The coastal drainage
                              and associated waters from the Altamaha
                              River Basin boundary to the St. Johns
                              River Basin boundary. Florida, Georgia.
                                Area =     6220 sq.mi.

      Cataloging Units  03070201 -- Satilla. Georgia.
                                      Area =     2630 sq.mi.
                        03070202 -- Little Satilla. Georgia.
                                      Area =      773 sq.mi.
                        03070203 -- Cumberland-St. Simons. Georgia.
                                      Area =      768 sq.mi.
                        03070204 -- St. Marys. Florida, Georgia.
                                      Area =     1610 sq.mi.
                        03070205 -- Nassau. Florida.
                                      Area =      439 sq.mi.


  Subregion  0308 -- St. Johns: The coastal drainage and associated
                     waters from and including the St. Johns River Basin
                     to St. Lucie Inlet. Florida.
                       Area =    11600 sq.mi.

    Accounting Unit 030801 -- St. Johns: The St. Johns River Basin.
                              Florida.
                                Area =     9360 sq.mi.

      Cataloging Units  03080101 -- Upper St. Johns. Florida.
                                      Area =     3700 sq.mi.
                        03080102 -- Oklawaha. Florida.
                                      Area =     2860 sq.mi.
                        03080103 -- Lower St. Johns. Florida.
                                      Area =     2800 sq.mi.

    Accounting Unit 030802 -- East Florida Coastal: The coastal
                              drainage and associated waters from the
                              St. Johns River Basin boundary to
                              St. Lucie Inlet. Florida.
                                Area =     2190 sq.mi.

      Cataloging Units  03080201 -- Daytona - St. Augustine. Florida.
                                      Area =      760 sq.mi.
                        03080202 -- Cape Canaveral. Florida.
                                      Area =      760 sq.mi.
                        03080203 -- Vero Beach. Florida.
                                      Area =      670 sq.mi.


  Subregion  0309 -- Southern Florida: The coastal drainage and
                     associated waters from St. Lucie Inlet to and
                     including the Caloosahatchee River Basin, and
                     interior drainage south of the St. Johns and Peace
                     River Basins. Florida.
                       Area =    18700 sq.mi.

    Accounting Unit 030901 -- Kissimmee: The Kissimmee River Basin and
                              interior drainage into Lake Okeechobee
                              from the North. Florida.
                                Area =     4210 sq.mi.

      Cataloging Units  03090101 -- Kissimmee. Florida.
                                      Area =     3010 sq.mi.
                        03090102 -- Northern Okeechobee Inflow. Florida.
                                      Area =      282 sq.mi.
                        03090103 -- Western Okeechobee Inflow. Florida.
                                      Area =      918 sq.mi.

    Accounting Unit 030902 -- Southern Florida: The coastal drainage and
                              associated waters from St. Lucie Inlet to
                              and including the Caloosahatchee River
                              Basin, and interior drainage south of the
                              St. Johns and Peace River Basins,
                              excluding the Kissimmee River Basin and
                              interior drainage into Lake Okeechobee
                              from the North. Florida.
                                Area =    14500 sq.mi.

      Cataloging Units  03090201 -- Lake Okeechobee. Florida.
                                      Area =      727 sq.mi.
                        03090202 -- Everglades. Florida.
                                      Area =     8400 sq.mi.
                        03090203 -- Florida Bay-Florida Keys. Florida.
                                      Area =     1230 sq.mi.
                        03090204 -- Big Cypress Swamp. Florida.
                                      Area =     2710 sq.mi.
                        03090205 -- Caloosahatchee. Florida.
                                      Area =     1420 sq.mi.


  Subregion  0310 -- Peace-Tampa Bay: The coastal drainage and
                     associated waters from the Caloosahatchee River
                     Basin boundary to and including the withlacoochee
                     River Basin. Florida.
                       Area =    10000 sq.mi.

    Accounting Unit 031001 -- Peace: The coastal drainage and associated
                              waters from the Caloosahatchee
                              River Basin boundary to Gasparilla Pass.
                              Florida.
                                Area =     3610 sq.mi.

      Cataloging Units  03100101 -- Peace. Florida.
                                      Area =     2420 sq.mi.
                        03100102 -- Myakka. Florida.
                                      Area =      606 sq.mi.
                        03100103 -- Charlotte Harbor. Florida.
                                      Area =      587 sq.mi.

     Accounting Unit 031002 -- Tampa Bay: The coastal drainage and
                               associated waters from Gasparilla Pass to and
                               including the Withlacoochee River Basin. Florida.
                                 Area =     6410 sq.mi.

      Cataloging Units  03100201 -- Sarasota Bay. Florida.
                                      Area =      428 sq.mi.
                        03100202 -- Manatee. Florida.
                                      Area =      375 sq.mi.
                        03100203 -- Little Manatee. Florida.
                                      Area =      217 sq.mi.
                        03100204 -- Alafia. Florida.
                                      Area =      434 sq.mi.
                        03100205 -- Hillsborough. Florida.
                                      Area =      678 sq.mi.
                        03100206 -- Tampa Bay. Florida.
                                      Area =      894 sq.mi.
                        03100207 -- Crystal-Pithlachascotee.
                                    Florida.
                                      Area =     1290 sq.mi.
                        03100208 -- Withlacoochee. Florida.
                                      Area =     2090 sq.mi.


  Subregion  0311 -- Suwannee: The coastal drainage and associated
                     waters from the Withlacoochee River Basin boundary
                     to and including the Aucilla River Basin. Florida,
                     Georgia.
                       Area =   13800 sq.mi.

    Accounting Unit 031101 -- Aucilla-Waccasassa: The coastal drainage
                              and associated waters from the
                              Withlacoochee River Basin boundary to and
                              including the Aucilla River Basin,
                              excluding the Suwannee River Basin.
                              Florida, Georgia.
                                Area =     3870 sq.mi.

      Cataloging Units  03110101 -- Waccasassa. Florida.
                                      Area =      936 sq.mi.
                        03110102 -- Econfina-Steinhatchee. Florida.
                                      Area =     1930 sq.mi.
                        03110103 -- Aucilla. Florida, Georgia.
                                      Area =     1000 sq.mi.

    Accounting Unit 031102 -- Suwannee: The Suwannee River Basin.
                              Florida, Georgia.
                                Area =     9930 sq.mi.

      Cataloging Units  03110201 -- Upper Suwannee.  Florida, Georgia.
                                      Area =     2720 sq.mi.
                        03110202 -- Alapaha. Florida, Georgia.
                                      Area =     1840 sq.mi.
                        03110203 -- withlacoochee. Florida, Georgia.
                                      Area =     1510 sq.mi.
                        03110204 -- Little. Georgia.
                                      Area =      884 sq.mi.
                        03110205 -- Lower Suwannee. Florida.
                                      Area =     1590 sq.mi.
                        03110206 -- Santa Fe. Florida.
                                      Area =     1390 sq.mi.


  Subregion  0312 -- Ochlockonee: The coastal drainage and associated
                     waters from the Aucilla River Basin boundary to and
                     including the Ochlockonee River Basin. Florida,
                     Georgia.
                       Area =     3650 sq.mi.

    Accounting Unit 031200 -- Ochlockonee. Florida. Georgia.
                                Area =     3650 sq.mi.

      Cataloging Units  03120001 -- Apalachee Bay-St. Marks. Florida,
                                    Georgia.
                                      Area =     1180 sq.mi.
                        03120002 -- Upper Ochlockonee. Georgia.
                                      Area =      925 sq.mi.
                        03120003 -- Lower Ochlockonee. Florida,
                                    Georgia.
                                      Area =     1540 sq.mi.

  Subregion  0313 -- Apalachicola: The coastal drainage and
                     associated waters from the Ochlockonee River Basin
                     boundary to and including the Apalachicola River
                     Basin and the drainage into Apalachicola Bay.
                     Alabama, Florida, Georgia.
                       Area =    20500 sq.mi.

    Accounting Unit 031300 -- Apalachicola. Alabama, Florida,
                              Georgia.
                                Area =    20500 sq.mi.

      Cataloging Units  03130001 -- Upper Chattahoochee. Georgia.
                                      Area =     1560 sq.mi.
                        03130002 -- Middle Chattahoochee-Lake Harding.
                                    Alabama, Georgia.
                                      Area =     3060 sq.mi.
                        03130003 -- Middle Chattahoochee-Walter F.
                                    George Reservoir. Alabama, Georgia.
                                      Area =     2880 sq.mi.
                        03130004 -- Lower Chattahoochee. Alabama,
                                    Florida, Georgia.
                                      Area =     1300 sq.mi.
                        03130005 -- Upper Flint. Georgia.
                                      Area =     2630 sq.mi.
                        03130006 -- Middle Flint. Georgia.
                                      Area =     1570 sq.mi.
                        03130007 -- Kinchafoonee-Muckalee. Georgia.
                                      Area =     1090 sq.mi.
                        03130008 -- Lower Flint. Georgia.
                                      Area =     1290 sq.mi.
                        03130009 -- Ichawaynochaway. Georgia.
                                      Area =     1110 sq.mi.
                        03130010 -- Spring. Georgia.
                                      Area =      778 sq.mi.
                        03130011 -- Apalachicola. Florida, Georgia.
                                      Area =     1130 sq.mi.
                        03130012 -- Chipola. Alabama, Florida.
                                      Area =     1270 sq.mi.
                        03130013 -- New. Florida.
                                      Area =      569 sq.mi.
                        03130014 -- Apalachicola Bay. Florida.
                                      Area =      266 sq.mi.


  Subregion  0314 -- Choctawhatchee - Escambia: The coastal drainage and
                     associated waters from the Apalachicola Bay
                     drainage boundary to the Mobile Bay drainage
                     boundary. Alabama, Florida.
                       Area =    15000 sq.mi.

    Accounting Unit 031401 -- Florida Panhandle Coastal: The coastal
                              drainage and associated waters from the
                              Apalachicola Bay drainage boundary to the
                              Mobile Bay drainage boundary, excluding
                              the Choctawhatchee and Escambia River
                              Basins. Alabama, Florida, Georgia.
                                Area =     6060 sq.mi.

      Cataloging Units  03140101 -- St. Andrew-St. Joseph Bays. Florida.
                                      Area =     1350 sq.mi.
                        03140102 -- Choctawhatchee Bay. Florida.
                                      Area =      699 sq.mi.
                        03140103 -- Yellow. Alabama, Florida.
                                      Area =     1380 sq.mi.
                        03140104 -- Blackwater. Alabama, Florida.
                                      Area =      860 sq.mi.
                        03140105 -- Pensacola Bay. Florida.
                                      Area =      543 sq.mi.
                        03140106 -- Perdido. Alabama, Florida.
                                      Area =      913 sq.mi.
                        03140107 -- Perdido Bay. Alabama, Florida.
                                      Area =      313 sq.mi.

    Accounting Unit 031402 -- Choctawhatchee: The Choctawhatchee River
                              Basin. Alabama, Florida.
                                Area =     4670 sq.mi.

      Cataloging Units  03140201 -- Upper Choctawhatchee. Alabama.
                                      Area =     1560 sq.mi.
                        03140202 -- Pea. Alabama, Florida.
                                      Area =     1550 sq.mi.
                        03140203 -- Lower Choctawhatchee. Alabama,
                                    Florida.
                                      Area =     1560 sq.mi.

    Accounting Unit 031403 -- Escambia: The Escambia River Basin.
                              Alabama, Florida.
                                Area =     4290 sq.mi.

      Cataloging Units  03140301 -- Upper Conecuh. Alabama.
                                      Area =      853 sq.mi.
                        03140302 -- Patsaliga. Alabama.
                                      Area =      593 sq.mi.
                        03140303 -- Sepulga. Alabama.
                                      Area =     1050 sq.mi.
                        03140304 -- Lower Conecuh. Alabama, Florida.
                                      Area =     1010 sq.mi.
                        03140305 -- Escambia. Alabama, Florida.
                                      Area =      780 sq.mi.


  Subregion  0315 -- Alabama: The Alabama River Basin. Alabama, Georgia,
                     Tennessee.
                       Area =    22700 sq.mi.

    Accounting Unit 031501 -- Coosa-Tallapoosa: The Alabama River Basin
                              above the confluence of and including the
                              Coosa and Tallapoosa River Basins.
                              Alabama, Georgia, Tennessee.
                                Area =    14800 sq.mi.

      Cataloging Units  03150101 -- Conasauga. Georgia, Tennessee.
                                      Area =      723 sq.mi.
                        03150102 -- Coosawattee. Georgia.
                                      Area =      848 sq.mi.
                        03150103 -- Oostanaula. Georgia.
                                      Area =      557 sq.mi.
                        03150104 -- Etowah. Georgia.
                                      Area =     1850 sq.mi.
                        03150105 -- Upper Coosa. Alabama, Georgia.
                                      Area =     1610 sq.mi.
                        03150106 -- Middle Coosa. Alabama.
                                      Area =     2580 sq.mi.
                        03150107 -- Lower Coosa. Alabama.
                                      Area =     1910 sq.mi.
                        03150108 -- Upper Tallapoosa. Alabama,
                                    Georgia.
                                      Area =     1400 sq.mi.
                        03150109 -- Middle Tallapoosa. Alabama.
                                      Area =     1590 sq.mi.
                        03150110 -- Lower Tallapoosa. Alabama.
                                      Area =     1700 sq.mi.


    Accounting Unit 031502 -- Alabama: The Alabama River Basin below the
                              confluence of the Coosa and Tallapoosa
                              River Basins. Alabama.
                                Area =     7950 sq.mi.

      Cataloging Units  03150201 -- Upper Alabama. Alabama.
                                      Area =     2430 sq.mi.
                        03150202 -- Cahaba. Alabama.
                                      Area =     1850 sq.mi.
                        03150203 -- Middle Alabama. Alabama.
                                      Area =     2250 sq.mi.
                        03150204 -- Lower Alabama. Alabama.
                                      Area =     1420 sq.mi.


  Subregion  0316 -- Mobile - Tombigbee: The drainage into Mobile Bay
                     excluding the Alabama River Basin. Alabama,
                     Mississippi.
                       Area =    21900 sq.mi.

    Accounting Unit 031601 -- Black Warrior - Tombigbee: the
                              Tombigbee River Basin above the confluence
                              with and including the Black Warrior River
                              Basin. Alabama, Mississippi.
                                Area =    15400 sq.mi.

      Cataloging Units  03160101 -- Upper Tombigbee.  Alabama,
                                    Mississippi.
                                      Area =     1790 sq.mi.
                        03160102 -- Town. Mississippi.
                                      Area =      689 sq.mi.
                        03160103 -- Buttahatchee. Alabama,
                                    Mississippi.
                                      Area =      863 sq.mi.
                        03160104 -- Tibbee. Mississippi.
                                      Area =     1100 sq.mi.
                        03160105 -- Luxapallila. Alabama,
                                    Mississippi.
                                      Area =      798 sq.mi.
                        03160106 -- Middle Tombigbee-Lubbub. Alabama,
                                    Mississippi.
                                      Area =     1650 sq.mi.
                        03160107 -- Sipsey. Alabama.
                                      Area =      788 sq.mi.
                        03160108 -- Noxubee. Alabama, Mississippi.
                                      Area =     1400 sq.mi.
                        03160109 -- Mulberry. Alabama.
                                      Area =     1380 sq.mi.
                        03160110 -- Sipsey Fork. Alabama.
                                      Area =     1010 sq.mi.
                        03160111 -- Locust. Alabama.
                                      Area =     1210 sq.mi.
                        03160112 -- Upper Black Warrior. Alabama.
                                      Area =     1250 sq.mi.
                        03160113 -- Lower Black Warrior. Alabama.
                                      Area =     1450 sq.mi.

    Accounting Unit 031602 -- Mobile Bay- Tombigbee: The drainage into
                              Mobile Bay excluding the Alabama River
                              Basin, the Tombigbee River Basin above
                              the confluence with the Black Warrior
                              River, and the Black Warrior River Basin.
                              Alabama, Mississippi.
                                Area =     6500 sq.mi.

      Cataloging Units  03160201 -- Middle Tombigbee-Chickasaw.
                                    Alabama, Mississippi.
                                      Area =     2090 sq.mi.
                        03160202 -- Sucarnoochee. Alabama, Mississippi.
                                      Area =      956 sq.mi.
                        03160203 -- Lower Tambigbee. Alabama.
                                      Area =     1600 sq.mi.
                        03160204 -- Mobile - Tensaw. Alabama.
                                      Area =      972 sq.mi.
                        03160205 -- Mobile Bay. Alabama.
                                      Area =      883 sq.mi.


  Subregion  0317 -- Pascagoula: The coastal drainage and associated
                     waters in Alabama and Mississippi north and east
                     of the Louisiana-Mississippi state line from the
                     Mobile Bay drainage boundary to the Pearl River
                     Basin boundary. Alabama, Mississippi.
                       Area =    12100 sq.mi.

    Accounting Unit 031700 -- Pascagoula. Alabama. Mississippi.
                                Area =    12100 sq.mi.

      Cataloging Units  03170001 -- Chunky-Okatibbee. Mississippi.
                                      Area =      907 sq.mi.
                        03170002 -- Upper Chickasawhay. Alabama,
                                    Mississippi.
                                      Area =     1480 sq.mi.
                        03170003 -- Lower Chickasawhay. Alabama,
                                    Mississippi.
                                      Area =      671 sq.mi.
                        03170004 -- Upper Leaf. Mississippi.
                                      Area =     1760 sq.mi.
                        03170005 -- Lower Leaf. Mississippi.
                                      Area =     1820 sq.mi.
                        03170006 -- Pascagoula. Mississippi.
                                      Area =      620 sq.mi.
                        03170007 -- Black. Mississippi.
                                      Area =     1290 sq.mi.
                        03170008 -- Escatawpa. Alabama, Mississippi.
                                      Area =     1080 sq.mi.
                        03170009 -- Mississippi Coastal. Alabama,
                                    Mississippi.
                                      Area =     2480 sq.mi.

  Subregion  0318 -- Pearl: The Pearl River Basin. Louisiana,
                     Mississippi.
                       Area =     8730 sq.mi.

    Accounting Unit 031800 -- Pearl. Louisiana, Mississippi.
                                Area =     8730 sq.mi.

      Cataloging Units  03180001 -- Upper Pearl. Mississippi.
                                      Area =     2490 sq.mi.
                        03180002 -- Middle Pearl-Strong. Mississippi.
                                      Area =     1990 sq.mi.
                        03180003 -- Middle Pearl-Silver. Mississippi.
                                      Area =     1220 sq.mi.
                        03180004 -- Lower Pearl. Louisiana. Mississippi.
                                      Area =     1810 sq.mi.
                        03180005 -- Bogue Chitto. Louisiana,
                                    Mississippi.
                                      Area =     1220 sq.mi.


Region 04  Great Lakes Region -- The drainage within the United States
           that ultimately discharges into: (a) the Great Lakes
           system, including the lake surfaces, bays, and islands; and
           (b) the St. Lawrence River to the Riviere Richelieu drainage
           boundary. Includes parts of Illinois, Indiana,
           Michigan, Minnesota, New York, Ohio, Pennsylvania, and
           Wisconsin.


  Subregion  0401 -- Western Lake Superior: The drainage into Lake
                     Superior within the United States from the Ontario-
                     Minnesota international boundary to and including
                     the Montreal River Basin. Michigan, Minnesota,
                     Wisconsin.
                       Area =     9240 sq.mi.

    Accounting Unit 040101 -- Northwestern Lake Superior: The drainage
                              into Lake Superior within the United
                              States from the Ontario-Minnesota
                              international boundary to the St. Louis
                              River Basin boundary. Minnesota.
                                Area =     2260 sq.mi.

      Cataloging Units  04010101 -- Baptism-Brule. Minnesota.
                                      Area =     1620 sq.mi.
                        04010102 -- Beaver-Lester. Minnesota.
                                      Area =      635 sq.mi.

    Accounting Unit 040102 -- St. Louis: The St. Louis River Basin.
                              Minnesota, Wisconsin.
                                Area =     3810 sq.mi.

      Cataloging Units  04010201 -- St. Louis. Minnesota, Wisconsin.
                                      Area =     3010 sq.mi.
                        04010202 -- Cloquet. Minnesota.
                                      Area =      796 sq.mi.

    Accounting Unit 040103 -- Southwestern Lake Superior: The drainage
                              into Lake Superior from the St. Louis
                              River Basin boundary to and including
                              the Montreal River Basin. Michigan,
                              Minnesota, Wisconsin.
                                Area =     3180 sq.mi.

      Cataloging Units  04010301 -- Beartrap-Nemadji. Minnesota,
                                    Wisconsin.
                                      Area =     1850 sq.mi.
                        04010302 -- Bad-Montreal. Michigan, Wisconsin.
                                      Area =     1330 sq.mi.


  Subregion  0402 -- Southern Lake Superior-Lake Superior: The drainage
                     into Lake Superior within the United States from
                     the Montreal River Basin boundary to the Soo Locks
                     at Sault Sainte Marie, and Lake Superior within the
                     United States, including its bays and islands.
                     Michigan, Minnesota, Wisconsin.
                       Area =    28600 sq.mi.

    Accounting Unit 040201 -- Southcentral Lake Superior: The drainage
                              into Lake Superior from the Montreal River
                              Basin boundary to and including the Carp
                              River Basin. Michigan, Wisconsin.
                                Area =     5210 sq.mi.

      Cataloging Units  04020101 -- Black-Presque Isle. Michigan,
                                    Wisconsin.
                                      Area =     1030 sq.mi.
                        04020102 -- Ontonagon. Michigan, Wisconsin.
                                      Area =     1390 sq.mi.
                        04020103 -- Keweenaw Peninsula. Michigan.
                                      Area =     1130 sq.mi.
                        04020104 -- Sturgeon. Michigan.
                                      Area =      710 sq.mi.
                        04020105 -- Dead-Kelsey. Michigan.
                                      Area =      946 sq.mi.

    Accounting Unit 040202 -- Southeastern Lake Superior: The drainage
                              into Lake Superior within the United
                              States from the Carp River Basin boundary
                              to the Soo Locks at Sault Sainte Marie.
                              Michigan.
                                Area =     2340 sq.mi.

      Cataloging Units  04020201 -- Betsy-Chocolay. Michigan.
                                      Area =     1180 sq.mi.
                        04020202 -- Tahquamenon. Michigan.
                                      Area =      832 sq.mi.
                        04020203 -- Waiska. Michigan.
                                      Area =      324 sq.mi.

    Accounting Unit 040203 -- Lake Superior: Lake Superior within the
                              United States, including its bays and
                              islands. Michigan, Minnesota, Wisconsin.
                                Area =    21100 sq.mi.


      Cataloging Unit   04020300 -- Lake Superior. Michigan. Minnesota,
                                    Wisconsin.
                                      Area =    21100 sq.mi.


  Subregion  0403 -- Northwestern Lake Michigan: The drainage into
                     Lake Michigan from the Milwaukee River Basin
                     boundary to the Manistique River Basin boundary.
                     Michigan, Wisconsin.
                       Area =    18700 sq.mi.

    Accounting Unit 040301 -- Northwestern Lake Michigan: The drainage
                              into Lake Michigan from the Milwaukee
                              River Basin boundary to the Manistique
                              River Basin boundary, excluding the Fox
                              River Basin. Michigan, Wisconsin.
                                Area =    12400 sq.mi.

      Cataloging Units  04030101 -- Manitowoc-Sheboygan. Wisconsin.
                                      Area =     1650 sq.mi.
                        04030102 -- Door-Kewaunee. Wisconsin.
                                      Area =      776 sq.mi.
                        04030103 -- Duck-Pensaukee. Wisconsin.
                                      Area =      483 sq.mi.
                        04030104 -- Oconto. Wisconsin.
                                      Area =     1040 sq.mi.
                        04030105 -- Peshtigo. Wisconsin.
                                      Area =     1170 sq.mi.
                        04030106 -- Brule. Michigan, Wisconsin.
                                      Area =     1060 sq.mi.
                        04030107 -- Michigamme. Michigan.
                                      Area =      734 sq.mi.
                        04030108 -- Menominee. Michigan, Wisconsin.
                                      Area =     2310 sq.mi.
                        04030109 -- Cedar-Ford. Michigan.
                                      Area =     1010 sq.mi.
                        04030110 -- Escanaba. Michigan.
                                      Area =      935 sq.mi.
                        04030111 -- Tacoosh-Whitefish. Michigan.
                                      Area =      656 sq.mi.
                        04030112 -- Fishdam-Sturgeon. Michigan.
                                      Area =      556 sq.mi.

    Accounting Unit 040302 -- Fox: The Fox River Basin. Wisconsin.
                                Area =     6340 sq.mi.

      Cataloging Units  04030201 -- Upper Fox. Wisconsin.
                                      Area =     1610 sq.mi.
                        04030202 -- Wolf. Wisconsin.
                                      Area =     3720 sq.mi.
                        04030203 -- Lake Winnebago. Wisconsin.
                                      Area =      570 sq.mi.
                        04030204 -- Lower Fox. Wisconsin.
                                      Area =      438 sq.mi.


  Subregion  0404 -- Southwestern Lake Michigan. The drainage into Lake
                     Michigan from the St. Joseph River Basin boundary
                     to and including the Milwaukee River Basin.
                     Illinois, Indiana, Michigan, Wisconsin.
                       Area =     1970 sq.mi.

    Accounting Unit 040400 -- Southwestern Lake Michigan. Illinois,
                              Indiana, Michigan, Wisconsin.
                                Area =     1970 sq.mi.

      Cataloging Units  04040001 -- Little Calumet-Galien. Illinois,
                                    Indiana, Michigan.
                                      Area =      705 sq.mi.
                        04040002 -- Pike-Root. Illinois, Wisconsin.
                                      Area =      399 sq.mi.
                        04040003 -- Milwaukee. Wisconsin.
                                      Area =      861 sq.mi.


  Subregion  0405 -- Southeastern Lake Michigan: The drainage into Lake
                     Michigan from and including the St. Joseph River
                     Basin to and including the Grand River Basin.
                     Indiana, Michigan.
                       Area =    12800 sq.mi.

    Accounting Unit 040500 -- Southeastern Lake Michigan. Indiana,
                              Michigan.
                                Area =    12800 sq.mi.

      Cataloging Units  04050001 -- St. Joseph. Indiana, Michigan
                                      Area =     4670 sq.mi.
                        04050002 -- Black-Macatawa. Michigan.
                                      Area =      600 sq.mi.
                        04050003 -- Kalamazoo. Michigan.
                                      Area =     2030 sq.mi.
                        04050004 -- Upper Grand. Michigan.
                                      Area =     1730 sq.mi.
                        04050005 -- Maple. Michigan.
                                      Area =      924 sq.mi.
                        04050006 -- Lower Grand. Michigan.
                                      Area =     1990 sq.mi.
                        04050007 -- Thornapple. Michigan.
                                      Area =      874 sq.mi.


  Subregion  0406 -- Northeastern Lake Michigan-Lake Michigan: the
                     drainage into Lake Michigan from the Grand River
                     Basin boundary to and including the Manistique
                     River Basin, and Lake Michigan, including its Bays
                     and Islands. Illinois, Indiana, Michigan,
                     Wisconsin.
                       Area =    33600 sq.mi.

    Accounting Unit 040601 -- Northeastern Lake Michigan: The drainage
                              into Lake Michigan from the Grand River
                              Basin boundary to and including the
                              Manistique River Basin. Michigan.
                                Area =    11300 sq.mi.

      Cataloging Units  04060101 -- Pere Marquette-White. Michigan.
                                      Area =     2100 sq.mi.
                        04060102 -- Muskegon. Michigan.
                                      Area =     2680 sq.mi.
                        04060103 -- Manistee. Michigan.
                                      Area =     1970 sq.mi.
                        04060104 -- Betsie-Platte. Michigan.
                                      Area =      819 sq.mi.
                        04060105 -- Boardman-Charlevoix. Michigan.
                                      Area =     1650 sq.mi.
                        04060106 -- Manistique. Michigan.
                                      Area =     1480 sq.mi.
                        04060107 -- Brevoort-Millecoquins. Michigan.
                                      Area =      578 sq.mi.

    Accounting Unit 040602 -- Lake Michigan: Lake Michigan, including
                              its bays and islands. Illinois, Indiana,
                              Michigan, Wisconsin.
                                Area =    22300 sq.mi.

      Cataloging Units  04060200 -- Lake Michigan. Illinois, Indiana,
                                    Michigan, Wisconsin.
                                      Area =   22300 sq.mi.


  Subregion  0407 -- Northwestern Lake Huron: The drainage into Lake
                     Huron within the United States from the Soo Locks
                     at Sault Sainte Marie to and including the Au Sable
                     River Basin. Michigan.
                       Area =     7110 sq.mi.

    Accounting Unit 040700 -- Northwestern Lake Huron. Michigan.
                                Area =     7110 sq.mi.

      Cataloging Units  04070001 -- St. Marys. Michigan.
                                      Area =      853 sq.mi.
                        04070002 -- Carp-Pine. Michigan.
                                      Area =      641 sq.mi.
                        04070003 -- Lone Lake-Ocqueoc. Michigan.
                                      Area =      810 sq.mi.
                        04070004 -- Cheboygan. Michigan.
                                      Area =      918 sq.mi.
                        04070005 -- Black. Michigan.
                                      Area =      618 sq.mi.
                        04070006 -- Thunder Bay. Michigan.
                                      Area =     1270 sq.mi.
                        04070007 -- Au Sable. Michigan.
                                      Area =     2000 sq.mi.


  Subregion  0408 --  Southwestern Lake Huron-Lake Huron: The drainage
                      into Lake Huron within the United States, from the
                      Au Sable River Basin boundary to the St. Clair
                      River Basin boundary at the mouth of Lake Huron,
                      and Lake Huron within the United States, including
                      its bays and islands. Michigan.
                        Area =    18000 sq.mi.

    Accounting Unit 040801 -- Southwestern Lake Huron: The drainage into
                              Lake Huron within the United States from
                              the Au Sable River Basin boundary to the
                              St. Clair River Basin boundary at the
                              mouth of Lake Huron, excluding the
                              Saginaw River Basin. Michigan.
                                Area =     2960 sq.mi.

      Cataloging Units  04080101 -- Au Gres-Rifle. Michigan.
                                      Area =     1030 sq.mi.
                        04080102 -- Kawkawlin-Pine. Michigan.
                                      Area =      503 sq.mi.
                        04080103 -- Pigeon-Wiscoggin. Michigan.
                                      Area =      853 sq.mi.
                        04080104 -- Birch-Willow. Michigan.
                                      Area =      572 sq.mi.

    Accounting Unit 040802 -- Saginaw: The Saginaw River Basin.
                              Michigan.
                                Area =     6160 sq.mi.

      Cataloging Units  04080201 -- Tittabawassee. Michigan.
                                      Area =     1430 sq.mi.
                        04080202 -- Pine. Michigan.
                                      Area =     1040 sq.mi.
                        04080203 -- Shiawassee. Michigan.
                                      Area =     1220 sq.mi.
                        04080204 -- Flint. Michigan.
                                      Area =     1340 sq.mi.
                        04080205 -- Cass. Michigan.
                                      Area =      881 sq.mi.
                        04080206 -- Saginaw. Michigan.
                                      Area =      250 sq.mi.

    Accounting Unit 040803 -- Lake Huron: Lake Huron within the
                              United States, including its Bays and
                              Islands. Michigan.
                                Area =     8920 sq.mi.

      Cataloging Unit   04080300 -- Lake Huron. Michigan.
                                      Area =     8920 sq.mi.


  Subregion  0409 -- St. Clair-Detroit: The St. Clair and Detroit River
                     Basins within the United States from the mouth of
                     Lake Huron to and including the Huron River Basin,
                     and Lake St. Clair within the United States.
                     Michigan.
                       Area =     3960 sq.mi.

    Accounting Unit 040900 -- St. Clair-Detroit. Michigan.
                                Area =     3960 sq.mi.

      Cataloging Units  04090001 -- St. Clair. Michigan.
                                      Area =     1210 sq.mi.
                        04090002 -- Lake St. Clair. Michigan.
                                      Area =      413 sq.mi.
                        04090003 -- Clinton. Michigan.
                                      Area =      742 sq.mi.
                        04090004 -- Detroit. Michigan.
                                      Area =      685 sq.mi.
                        04090005 -- Huron. Michigan.
                                      Area =      909 sq.mi.


  Subregion  0410 -- Western Lake Erie: The drainage into Lake Erie from
                     the Huron River Basin boundary to and including the
                     Vermilion River Basin. Indiana, Michigan, Ohio.
                       Area =    11900 sq.mi.

    Accounting Unit 041000 -- Western Lake Erie. Indiana, Michigan,
                              Ohio.
                                Area =    11900 sq.mi.

      Cataloging Units  04100001 -- Ottawa-Stony. Michigan, Ohio.
                                      Area =      689 sq.mi.
                        04100002 -- Raisin. Michigan, Ohio.
                                      Area =     1070 sq.mi.
                        04100003 -- St. Joseph. Indiana, Michigan, Ohio.
                                      Area =     1060 sq.mi.
                        04100004 -- St. Marys. Indiana, Ohio.
                                      Area =      820 sq.mi.
                        04100005 -- Upper Maumee. Indiana, Ohio.
                                      Area =      385 sq.mi.
                        04100006 -- Tiffin. Michigan, Ohio.
                                      Area =      781 sq.mi.
                        04100007 -- Auglaize. Indiana, Ohio.
                                      Area =     1660 sq.mi.
                        04100008 -- Blanchard. Ohio.
                                      Area =      757 sq.mi.
                        04100009 -- Lower Maumee. Ohio.
                                      Area =     1080 sq.mi.
                        04100010 -- Cedar-Portage. Ohio.
                                      Area =      958 sq.mi.
                        04100011 -- Sandusky. Ohio.
                                      Area =     1850 sq.mi.
                        04100012 -- Huron-Vermilion. Ohio.
                                      Area =      754 sq.mi.


  Subregion  0411 -- Southern Lake Erie: The drainage into Lake Erie
                     from the Vermilion River Basin boundary to and
                     including the Ashtabula River Basin. Ohio,
                     Pennsylvania.
                       Area =     3030 sq.mi.

    Accounting Unit 041100 -- Southern Lake Erie. Ohio, Pennsylvania.
                                Area =     3030 sq.mi.

      Cataloging Units  04110001 -- Black-Rocky. Ohio.
                                      Area =      888 sq.mi.
                        04110002 -- Cuyahoga. Ohio.
                                      Area =      804 sq.mi.
                        04110003 -- Ashtabula-Chagrin. Ohio,
                                    Pennsylvania.
                                      Area =      630 sq.mi.
                        04110004 -- Grand. Ohio.
                                      Area =      710 sq.mi.


  Subregion  0412 -- Eastern Lake Erie-Lake Erie: The drainage into Lake
                     Erie within the United States from the Ashtabula
                     River Basin boundary to and including the
                     Niagara River Basin, and Lake Erie within the
                     United States, including its bays and islands.
                     Michigan, New York, Ohio, Pennsylvania.
                       Area =     7740 sq.mi.

    Accounting Unit 041201 -- Eastern Lake Erie: The drainage into Lake
                              Erie within the United States from the
                              Ashtabula River Basin boundary to and
                              including the Niagara River Basin.
                              New York, Ohio, Pennsylvania.
                                Area =     2930 sq.mi.

      Cataloging Units  04120101 -- Chautauqua-Conneaut. New York, Ohio,
                                    Pennsylvania.
                                      Area =      874 sq.mi.
                        04120102 -- Cattaraugus. New York.
                                      Area =      548 sq.mi.
                        04120103 -- Buffalo-Eighteenmile. New York.
                                      Area =      732 sq.mi.
                        04120104 -- Niagara. New York.
                                      Area =      774 sq.mi.

    Accounting Unit 041202 -- Lake Erie: Lake Erie within the
                              United States, including its bays and
                              islands. Michigan, New York, Ohio,
                              Pennsylvania.
                                Area =     4810 sq.mi.

      Cataloging Unit   04120200 -- Lake Erie. Michigan, New York, Ohio,
                                    Pennsylvania.
                                      Area =     4810 sq.mi.


  Subregion  0413 -- Southwestern Lake Ontario: The drainage into
                     Lake Ontario from the Niagara River Basin
                     boundary to and including the Genesee River Basin.
                     New York, Pennsylvania.
                       Area =     3540 sq.mi.

    Accounting Unit 041300 -- Southwestern Lake Ontario. New York,
                              Pennsylvania.
                                Area =     3540 sq.mi.

      Cataloging Units  04130001 -- Oak Orchard-Twelvemile. New York.
                                      Area =     1040 sq.mi.
                        04130002 -- Upper Genesee. New York,
                                    Pennsylvania.
                                      Area =     1430 sq.mi.
                        04130003 -- Lower Genesee. New York.
                                      Area =     1070 sq.mi.


  Subregion  0414 -- Southeastern Lake Ontario: The drainage into
                     Lake Ontario from the Genesee River Basin boundary
                     to and including the Stony Creek Basin. New York.
                       Area =     6710 sq.mi.

    Accounting Unit 041401 -- Southeastern Lake Ontario: The drainage
                              into Lake Ontario from the Genesee River
                              Basin boundary to and including the
                              Stony Creek Basin, excluding the Oswego
                              River Basin. New York.
                                Area =     1680 sq.mi.

      Cataloging Units  04140101 -- Irondequoit-Ninemile. New York.
                                      Area =      708 sq.mi.
                        04140102 -- Salmon-Sandy. New York.
                                      Area =      969 sq.mi.

    Accounting Unit 041402 -- Oswego: The Oswego River Basin. New York.
                                Area =     5030 sq.mi.

      Cataloging Units  04140201 -- Seneca. New York.
                                      Area =     3430 sq.mi.
                        04140202 -- Oneida. New York.
                                      Area =     1470 sq.mi.
                        04140203 -- Oswego. New York.
                                      Area =      131 sq.mi.


  Subregion  0415 -- Northeastern Lake Ontario-Lake
                     Ontario-St. Lawrence: The drainage into
                     Lake Ontario and the St. Lawrence River Basin
                     within the United States from the Stony Creek
                     Basin boundary to and including the English River
                     Basin, and Lake Ontario within the United States,
                     including its bays and islands. New York.
                       Area =    11400 sq.mi.

    Accounting Unit 041501 -- Northeastern Lake Ontario: The drainage
                              into Lake Ontario from the Stony Creek
                              Basin boundary to the drainage boundary of
                              the St. Lawrence River at the mouth of
                              Lake Ontario. New York.
                                Area =     2300 sq.mi.

      Cataloging Units  04150101 -- Black. New York.
                                      Area =     1920 sq.mi.
                        04150102 -- Chaumont-Perch. New York.
                                      Area =      380 sq.mi.


    Accounting Unit 041502 -- Lake Ontario: Lake Ontario within the
                              United States, including its Bays and
                              Islands. New York.
                                Area =     3430 sq.mi.

      Cataloging Unit   04150200 -- Lake Ontario. New York.
                                      Area =     3430 sq.mi.

    Accounting Unit 041503 -- St. Lawrence: The drainage into the
                              St. Lawrence River Basin within the
                              United States from the mouth of
                              Lake Ontario to and including the English
                              River Basin. New York.
                                Area =     5650 sq.mi.

      Cataloging Units  04150301 -- Upper St. Lawrence. New York.
                                      Area =      506 sq.mi.
                        04150302 -- Oswegatchie. New York.
                                      Area =     1040 sq.mi.
                        04150303 -- Indian. New York.
                                      Area =      558 sq.mi.
                        04150304 -- Grass. New York.
                                      Area =      630 sq.mi.
                        04150305 -- Raquette. New York.
                                      Area =     1250 sq.mi.
                        04150306 -- St. Regis. New York.
                                      Area =      853 sq.mi.
                        04150307 -- English-Salmon. New York.
                                      Area =      811 sq.mi.


Region 05  Ohio Region -- The drainage of the Ohio River Basin,
           excluding the Tennessee River Basin. Includes parts of
           Illinois, Indiana, Kentucky, Maryland, New York,
           North Carolina, Ohio, Pennsylvania, Tennessee, Virginia and
           West Virginia.


  Subregion  0501 -- Allegheny: The Allegheny River Basin. Pennsylvania,
                     New York.
                       Area =    11600 sq.mi.

    Accounting Unit 050100 -- Allegheny. Pennsylvania, New York.
                                Area =    11600 sq.mi.

      Cataloging Units  05010001 -- Upper Allegheny. Pennsylvania,
                                    New York.
                                      Area =     2560 sq.mi.
                        05010002 -- Conewango. Pennsylvania, New York.
                                      Area =      888 sq.mi.
                        05010003 -- Middle Allegheny-Tionesta.
                                    Pennsylvania.
                                      Area =     1670 sq.mi.
                        05010004 -- French. Pennsylvania, New York.
                                      Area =     1210 sq.mi.
                        05010005 -- Clarion. Pennsylvania.
                                      Area =     1230 sq.mi.
                        05010006 -- Middle Allegheny-Redbank.
                                    Pennsylvania.
                                      Area =     1680 sq.mi.
                        05010007 -- Conemaugh. Pennsylvania.
                                      Area =     1350 sq.mi.
                        05010008 -- Kiskiminetas. Pennsylvania.
                                      Area =      500 sq.mi.
                        05010009 -- Lower Allegheny. Pennsylvania.
                                      Area =      479 sq.mi.


  Subregion  0502 -- Monongahela: The Monongahela River Basin. Maryland,
                     Pennsylvania, West Virginia.
                       Area =     7310 sq.mi.

    Accounting Unit 050200 -- Monongahela. Maryland, Pennsylvania,
                              West Virginia.
                                Area =     7310 sq.mi.

      Cataloging Units  05020001 -- Tygart Valley. West Virginia.
                                      Area =     1380 sq.mi.
                        05020002 -- West Fork. West Virginia.
                                      Area =      877 sq.mi.
                        05020003 -- Upper Monongahela. Pennsylvania,
                                    West Virginia.
                                      Area =      463 sq.mi.
                        05020004 -- Cheat. Pennsylvania, West Virginia.
                                      Area =     1410 sq.mi.
                        05020005 -- Lower Monongahela. Pennsylvania,
                                    West Virginia.
                                      Area =     1450 sq.mi.
                        05020006 -- Youghiogheny. Maryland,
                                    Pennsylvania, West Virginia.
                                      Area =     1730 sq.mi.


  Subregion  0503 -- Upper Ohio: The Ohio River Basin below the
                     confluence of the Allegheny and Monongahela River
                     Basins to the confluence with the Kanawha River
                     Basin, excluding the Muskingum River Basin. Ohio,
                     Pennsylvania, West Virginia.
                       Area =    13200 sq.mi.

    Accounting Unit 050301 -- Upper Ohio-Beaver. The Ohio River Basin
                              below the confluence of the Allegheny and
                              Monongahela River Basins to Lock and
                              Dam 14. Ohio, Pennsylvania, West Virginia.
                                Area =     6570 sq.mi.

      Cataloging Units  05030101 -- Upper Ohio. Ohio, Pennsylvania,
                                    West Virginia.
                                      Area =     1950 sq.mi.
                        05030102 -- Shenango. Ohio, Pennsylvania.
                                      Area =     1050 sq.mi.
                        05030103 -- Mahoning. Ohio, Pennsylvania.
                                      Area =     1130 sq.mi.
                        05030104 -- Beaver. Pennsylvania.
                                      Area =      108 sq.mi.
                        05030105 -- Connoquenessing. Pennsylvania.
                                      Area =      837 sq.mi.
                        05030106 -- Upper Ohio-Wheeling. Ohio,
                                    Pennsylvania, West Virginia.
                                      Area =     1490 sq.mi.

    Accounting Unit 050302 -- Upper Ohio-Little Kanawha: The Ohio River
                              Basin from Lock and Dam 14 to the
                              confluence with the Kanawha River Basin,
                              excluding the Muskingum River Basin. Ohio,
                              West Virginia.
                                Area =     6660 sq.mi.

      Cataloging Units  05030201 -- Little Muskingum-Middle Island.
                                    Ohio, West Virginia.
                                      Area =     1800 sq.mi.
                        05030202 -- Upper Ohio-Shade. Ohio,
                                    West Virginia.
                                      Area =     1390 sq.mi.
                        05030203 -- Little Kanawha. West Virginia.
                                      Area =     2300 sq.mi.
                        05030204 -- Hocking. Ohio.
                                      Area =     1170 sq.mi.


  Subregion  0504 -- Muskingum: The Muskingum River Basin. Ohio.
                       Area =     7980 sq.mi.

    Accounting Unit 050400 -- Muskingum. Ohio.
                                Area =     7980 sq.mi.

      Cataloging Units  05040001 -- Tuscarawas. Ohio.
                                      Area =     2580 sq.mi.
                        05040002 -- Mohican. Ohio.
                                      Area =      981 sq.mi.
                        05040003 -- Walhonding. Ohio.
                                      Area =     1250 sq.mi.
                        05040004 -- Muskingum. Ohio.
                                      Area =     1540 sq.mi.
                        05040005 -- Wills. Ohio.
                                      Area =      843 sq.mi.
                        05040006 -- Licking. Ohio.
                                      Area =      786 sq.mi.


  Subregion  0505 -- Kanawha: The Kanawha River Basin. North Carolina,
                     Virginia, West Virginia.
                       Area =    12200 sq.mi.

    Accounting Unit 050500 -- Kanawha. North Carolina, Virginia,
                              West Virginia.
                                Area =    12200 sq.mi.

      Cataloging Units  05050001 -- Upper New. North Carolina, Virginia.
                                      Area =     2900 sq.mi.
                        05050002 -- Middle New. Virginia, West Virginia.
                                      Area =     1650 sq.mi.
                        05050003 -- Greenbrier. West Virginia.
                                      Area =     1650 sq.mi.
                        05050004 -- Lower New. West Virginia.
                                      Area =      692 sq.mi.
                        05050005 -- Gauley. West Virginia.
                                      Area =     1420 sq.mi.
                        05050006 -- Upper Kanawha. West Virginia.
                                      Area =      522 sq.mi.
                        05050007 -- Elk. West Virginia.
                                      Area =     1530 sq.mi.
                        05050008 -- Lower Kanawha. West Virginia.
                                      Area =      940 sq.mi.
                        05050009 -- Coal. West Virginia.
                                      Area =      893 sq.mi.


  Subregion  0506 -- Scioto: The Scioto River Basin. Ohio.
                       Area =     6440 sq.mi.

    Accounting Unit 050600 -- Scioto. Ohio.
                                Area =     6440 sq.mi.

      Cataloging Units  05060001 -- Upper Scioto. Ohio.
                                      Area =     3160 sq.mi.
                        05060002 -- Lower Scioto. Ohio.
                                      Area =     2150 sq.mi.
                        05060003 -- Paint. Ohio.
                                      Area =     1130 sq.mi.


  Subregion  0507 -- Big Sandy-Guyandotte: The Big Sandy and Guyandotte
                     River Basins. Kentucky, Virginia, West Virginia.
                       Area =     5900 sq.mi.

    Accounting Unit 050701 -- Guyandotte: The Guyandotte River Basin.
                              West Virginia.
                                Area =     1680 sq.mi.

      Cataloging Units  05070101 -- Upper Guyandotte. West Virginia.
                                      Area =      945 sq.mi.
                        05070102 -- Lower Guyandotte. West Virginia.
                                      Area =      738 sq.mi.

    Accounting Unit 050702 -- Big Sandy: The Big Sandy River Basin.
                              Kentucky, Virginia, West Virginia.
                                Area =     4210 sq.mi.

      Cataloging Units  05070201 -- Tug. Kentucky, Virginia,
                                    West Virginia.
                                      Area =     1520 sq.mi.
                        05070202 -- Upper Levisa. Kentucky, Virginia.
                                      Area =     1200 sq.mi.
                        05070203 -- Lower Levisa. Kentucky.
                                      Area =     1090 sq.mi.
                        05070204 -- Big Sandy. Kentucky, West Virginia.
                                      Area =      402 sq.mi.


  Subregion  0508 -- Great Miami: The Great Miami River Basin. Indiana,
                     Ohio.
                       Area =     5330 sq.mi.

    Accounting Unit 050800 -- Great Miami. Indiana, Ohio.
                                Area =     5330 sq.mi.

      Cataloging Units  05080001 -- Upper Great Miami. Indiana, Ohio.
                                      Area =     2480 sq.mi.
                        05080002 -- Lower Great Miami. Indiana, Ohio.
                                      Area =     1390 sq.mi.
                        05080003 -- Whitewater. Indiana, Ohio.
                                      Area =     1460 sq.mi.


  Subregion  0509 -- Middle Ohio: The Ohio River Basin below the
                     confluence with the Kanawha River Basin to the
                     confluence with the Kentucky River Basin, excluding
                     the Big Sandy, Great Miami, Guyandotte, Kentucky,
                     Licking and Scioto River Basins. Indiana, Kentucky,
                     Ohio, West Virginia.
                       Area =     8850 sq.mi.

    Accounting Unit 050901 -- Middle Ohio-Raccoon: The Ohio River Basin
                              below the confluence with the
                              Kanawha River Basin to  river mile 359.3
                              (formerly Lock and Dam 31) on the Ohio
                              River, excluding the Big Sandy,
                              Guyandotte, and Scioto River Basins.
                              Kentucky, Ohio, West Virginia.
                                Area =     3630 sq.mi.

      Cataloging Units  05090101 -- Raccoon-Symmes. Ohio, West Virginia.
                                      Area =     1450 sq.mi.
                        05090102 -- Twelvepole. West Virginia.
                                      Area =      444 sq.mi.
                        05090103 -- Little Scioto-Tygarts. Kentucky,
                                    Ohio.
                                      Area =     1020 sq.mi.
                        05090104 -- Little Sandy. Kentucky.
                                      Area =      713 sq.mi.

    Accounting Unit 050902 -- Middle Ohio-Little Miami: The Ohio River
                              Basin from  river mile 359.3 (formerly Lock
                              and Dam 31) on the Ohio River to the
                              confluence with the Kentucky River Basin,
                              excluding the Great Miami, Kentucky and
                              Licking River Basins. Indiana, Kentucky,
                              Ohio.
                                Area =     5220 sq.mi.

      Cataloging Units  05090201 -- Ohio Brush-Whiteoak. Kentucky, Ohio.
                                      Area =     2110 sq.mi.
                        05090202 -- Little Miami. Ohio.
                                      Area =     1710 sq.mi.
                        05090203 -- Middle Ohio-Laughery. Indiana,
                                    Kentucky, Ohio.
                                      Area =     1400 sq.mi.


  Subregion  0510 -- Kentucky-Licking: The Licking and Kentucky River
                     Basins. Kentucky.
                       Area =    10500 sq.mi.

    Accounting Unit 051001 -- Licking: The Licking River Basin.
                              Kentucky.
                                Area =     3660 sq.mi.

      Cataloging Units  05100101 -- Licking. Kentucky.
                                      Area =     2740 sq.mi.
                        05100102 -- South Fork Licking. Kentucky.
                                      Area =      915 sq.mi.

    Accounting Unit 051002 -- Kentucky: The Kentucky River Basin.
                              Kentucky.
                                Area =     6870 sq.mi.

      Cataloging Units  05100201 -- North Fork Kentucky. Kentucky.
                                      Area =     1310 sq.mi.
                        05100202 -- Middle Fork Kentucky. Kentucky.
                                      Area =      552 sq.mi.
                        05100203 -- South Fork Kentucky. Kentucky.
                                      Area =      741 sq.mi.
                        05100204 -- Upper Kentucky. Kentucky.
                                      Area =     1070 sq.mi.
                        05100205 -- Lower Kentucky. Kentucky.
                                      Area =     3200 sq.mi.


  Subregion  0511 -- Green: The Green River Basin. Kentucky, Tennessee.
                       Area =     9140 sq.mi.

    Accounting Unit 051100 -- Green. Kentucky, Tennessee.
                                Area =     9140 sq.mi.

      Cataloging Units  05110001 -- Upper Green. Kentucky.
                                      Area =     3130 sq.mi.
                        05110002 -- Barren. Kentucky, Tennessee.
                                      Area =     2230 sq.mi.
                        05110003 -- Middle Green. Kentucky.
                                      Area =     1010 sq.mi.
                        05110004 -- Rough. Kentucky.
                                      Area =     1070 sq.mi.
                        05110005 -- Lower Green. Kentucky.
                                      Area =      911 sq.mi.
                        05110006 -- Pond. Kentucky.
                                      Area =      784 sq.mi.


  Subregion  0512 -- Wabash: The Wabash River Basin. Illinois,
                     Indiana, Ohio.
                       Area =    32600 sq.mi.

    Accounting Unit 051201 -- Wabash: The Wabash River Basin, excluding
                              the Patoka and White River Basins.
                              Illinois, Indiana, Ohio.
                                Area =    20500 sq.mi.

      Cataloging Units  05120101 -- Upper Wabash. Indiana, Ohio.
                                      Area =     1570 sq.mi.
                        05120102 -- Salamonie. Indiana.
                                      Area =      541 sq.mi.
                        05120103 -- Mississinewa. Indiana, Ohio.
                                      Area =      811 sq.mi.
                        05120104 -- Eel. Indiana.
                                      Area =      811 sq.mi.
                        05120105 -- Middle Wabash-Deer. Indiana.
                                      Area =      654 sq.mi.
                        05120106 -- Tippecanoe. Indiana.
                                      Area =     1930 sq.mi.
                        05120107 -- Wildcat. Indiana.
                                      Area =      797 sq.mi.
                        05120108 -- Middle Wabash-Little Vermilion.
                                    Illinois, Indiana.
                                      Area =     2230 sq.mi.
                        05120109 -- Vermilion. Illinois, Indiana.
                                      Area =     1410 sq.mi.
                        05120110 -- Sugar. Indiana.
                                      Area =      818 sq.mi.
                        05120111 -- Middle Wabash-Busseron. Illinois,
                                    Indiana.
                                      Area =     2000 sq.mi.
                        05120112 -- Embarras. Illinois.
                                      Area =     2430 sq.mi.
                        05120113 -- Lower Wabash. Illinois, Indiana.
                                      Area =     1300 sq.mi.
                        05120114 -- Little Wabash. Illinois.
                                      Area =     2120 sq.mi.
                        05120115 -- Skillet. Illinois.
                                      Area =     1060 sq.mi.

    Accounting Unit 051202 -- Patoka-White. The Patoka and White River
                              Basins. Indiana.
                                Area =    12100 sq.mi.

      Cataloging Units  05120201 -- Upper White. Indiana.
                                      Area =     2700 sq.mi.
                        05120202 -- Lower White. Indiana.
                                      Area =     1650 sq.mi.
                        05120203 -- Eel. Indiana.
                                      Area =     1200 sq.mi.
                        05120204 -- Driftwood. Indiana.
                                      Area =     1150 sq.mi.
                        05120205 -- Flatrock-Haw. Indiana.
                                      Area =      578 sq.mi.
                        05120206 -- Upper East Fork White. Indiana.
                                      Area =      806 sq.mi.
                        05120207 -- Muscatatuck. Indiana.
                                      Area =     1130 sq.mi.
                        05120208 -- Lower East Fork White. Indiana.
                                      Area =     2030 sq.mi.
                        05120209 -- Patoka. Indiana.
                                      Area =      854 sq.mi.


  Subregion  0513 -- Cumberland: The Cumberland River Basin. Kentucky,
                     Tennessee.
                       Area =    17700 sq.mi.

    Accounting Unit 051301 -- Upper Cumberland: The Cumberland River
                              Basin above the confluence with and
                              including the Caney Fork
                              Basin. Kentucky, Tennessee.
                                Area =    10600 sq.mi.

      Cataloging Units  05130101 -- Upper Cumberland. Kentucky,
                                    Tennessee.
                                      Area =     2300 sq.mi.
                        05130102 -- Rockcastle. Kentucky.
                                      Area =      760 sq.mi.
                        05130103 -- Upper Cumberland-Lake Cumberland.
                                    Kentucky, Tennessee.
                                      Area =     1870 sq.mi.
                        05130104 -- South Fork Cumberland. Kentucky,
                                    Tennessee.
                                      Area =     1360 sq.mi.
                        05130105 -- Obey. Kentucky, Tennessee.
                                      Area =      932 sq.mi.
                        05130106 -- Upper Cumberland-Cordell Hull
                                    Reservoir. Tennessee.
                                      Area =      782 sq.mi.
                        05130107 -- Collins. Tennessee.
                                      Area =      795 sq.mi.
                        05130108 -- Caney. Tennessee.
                                      Area =     1780 sq.mi.

    Accounting Unit 051302 -- Lower Cumberland: The Cumberland River
                              Basin below the confluence with the
                              Caney Fork Basin. Kentucky, Tennessee.
                                Area =     7150 sq.mi.

      Cataloging Units  05130201 -- Lower Cumberland-Old Hickory Lake.
                                    Tennessee.
                                      Area =      975 sq.mi.
                        05130202 -- Lower Cumberland-Sycamore.
                                    Tennessee.
                                      Area =      642 sq.mi.
                        05130203 -- Stones. Tennessee.
                                      Area =      921 sq.mi.
                        05130204 -- Harpeth. Tennessee.
                                      Area =      861 sq.mi.
                        05130205 -- Lower Cumberland. Kentucky,
                                    Tennessee.
                                      Area =     2300 sq.mi.
                        05130206 -- Red. Kentucky, Tennessee.
                                      Area =     1450 sq.mi.

  Subregion  0514 -- Lower Ohio: The Ohio River Basin below the
                     confluence with the Kentucky River Basin, to the
                     confluence with the Mississippi River, excluding
                     the Cumberland, Green, Tennessee, and Wabash River
                     Basins. Illinois, Indiana, Kentucky.
                       Area =    12500 sq.mi.

    Accounting Unit 051401 -- Lower Ohio-Salt. The Ohio River Basin
                              below the confluence with the
                              Kentucky River Basin, to  river mile 703.0
                              (formerly Lock and Dam 45) on the
                              Ohio River. Indiana, Kentucky.
                                Area =     6000 sq.mi.

      Cataloging Units  05140101 -- Silver-Little Kentucky. Indiana,
                                    Kentucky.
                                      Area =     1240 sq.mi.
                        05140102 -- Salt. Kentucky.
                                      Area =     1450 sq.mi.
                        05140103 -- Rolling Fork. Kentucky.
                                      Area =     1430 sq.mi.
                        05140104 -- Blue-Sinking. Kentucky, Indiana.
                                      Area =     1880 sq.mi.

    Accounting Unit 051402 -- Lower Ohio: The Ohio River Basin from
                               river mile 703.0 (formerly Lock and
                              Dam 45) on the Ohio River to the
                              confluence with the Mississippi River,
                              excluding the Cumberland, Green,
                              Tennessee, and Wabash River Basins.
                              Illinois, Indiana, Kentucky.
                                Area =     6480 sq.mi.

      Cataloging Units  05140201 -- Lower Ohio-Little Pigeon. Indiana, Kentucky.
                                      Area =     1370 sq.mi.
                        05140202 -- Highland-Pigeon. Indiana, Kentucky.
                                      Area =     1000 sq.mi.
                        05140203 -- Lower Ohio-Bay. Illinois, Kentucky.
                                      Area =     1090 sq.mi.
                        05140204 -- Saline. Illinois.
                                      Area =     1160 sq.mi.
                        05140205 -- Tradewater. Kentucky.
                                      Area =      936 sq.mi.
                        05140206 -- Lower Ohio. Illinois, Kentucky.
                                      Area =      928 sq.mi.


Region 06  Tennessee Region -- The drainage of the Tennessee River
           Basin. Includes parts of Alabama, Georgia, Kentucky,
           Mississippi, North Carolina, Tennessee, and Virginia.


  Subregion  0601 -- Upper Tennessee: The Tennessee River Basin above
                     Watts Bar Dam. Georgia, North Carolina, Tennessee,
                     Virginia.
                       Area =    17200 sq.mi.

    Accounting Unit 060101 -- French Broad-Holston: The Tennessee River
                              Basin above the confluence of and including
                              the French Broad and Holston River Basins.
                              North Carolina, Tennessee, Virginia.
                                Area =     8820 sq.mi.

      Cataloging Units  06010101 -- North Fork Holston. Tennessee,
                                    Virginia.
                                      Area =      708 sq.mi.
                        06010102 -- South Fork Holston. Tennessee,
                                    Virginia.
                                      Area =     1170 sq.mi.
                        06010103 -- Watauga. North Carolina, Tennessee.
                                      Area =      870 sq.mi.
                        06010104 -- Holston. Tennessee.
                                      Area =      990 sq.mi.
                        06010105 -- Upper French Broad. North Carolina,
                                    Tennessee.
                                      Area =     1870 sq.mi.
                        06010106 -- Pigeon. North Carolina, Tennessee.
                                      Area =      679 sq.mi.
                        06010107 -- Lower French Broad. Tennessee.
                                      Area =      792 sq.mi.
                        06010108 -- Nolichucky. North Carolina,
                                    Tennessee.
                                      Area =     1740 sq.mi.

    Accounting Unit 060102 -- Upper Tennessee: The Tennessee River
                              Basin above Watts Bar Dam, excluding the
                              French Broad and Holston River Basins.
                              Georgia, North Carolina, Tennessee,
                              Virginia.
                                Area =     8360 sq.mi.

      Cataloging Units  06010201 -- Watts Bar Lake. Tennessee.
                                      Area =     1340 sq.mi.
                        06010202 -- Upper Little Tennessee. Georgia,
                                    North Carolina.
                                      Area =      839 sq.mi.
                        06010203 -- Tuckasegee. North Carolina.
                                      Area =      731 sq.mi.
                        06010204 -- Lower Little Tennessee.
                                    North Carolina, Tennessee.
                                      Area =     1050 sq.mi.
                        06010205 -- Upper Clinch. Tennessee, Virginia.
                                      Area =     1970 sq.mi.
                        06010206 -- Powell. Tennessee, Virginia.
                                      Area =      939 sq.mi.
                        06010207 -- Lower Clinch. Tennessee.
                                      Area =      620 sq.mi.
                        06010208 -- Emory. Tennessee.
                                      Area =      866 sq.mi.


  Subregion  0602 -- Middle Tennessee-Hiwassee: The Tennessee River
                     Basin below Watts Bar Dam to and including the
                     Sequatchie River Basin. Alabama, Georgia,
                     North Carolina, Tennessee.
                       Area =     5160 sq.mi.

    Accounting Unit 060200 -- Middle Tennessee-Hiwassee. Alabama,
                              Georgia, North Carolina, Tennessee.
                                Area =     5160 sq.mi.

      Cataloging Units  06020001 -- Middle Tennessee-Chickamauga.
                                    Alabama, Georgia, Tennessee.
                                      Area =     1870 sq.mi.
                        06020002 -- Hiwassee. Georgia, North Carolina,
                                    Tennessee.
                                      Area =     2060 sq.mi.
                        06020003 -- Ocoee. Georgia, North Carolina,
                                    Tennessee.
                                      Area =      648 sq.mi.
                        06020004 -- Sequatchie. Tennessee.
                                      Area =      586 sq.mi.


  Subregion  0603 -- Middle Tennessee-Elk: The Tennessee River Basin
                     below the confluence with the Sequatchie River
                     Basin to Pickwick Dam. Alabama, Georgia,
                     Mississippi, Tennessee.
                       Area =    10300 sq.mi.

    Accounting Unit 060300 -- Middle Tennessee-Elk. Alabama, Georgia,
                              Mississippi, Tennessee.
                                Area =    10300 sq.mi.


      Cataloging Units  06030001 -- Guntersville Lake. Alabama, Georgia,
                                    Tennessee.
                                      Area =     1990 sq.mi.
                        06030002 -- Wheeler Lake. Alabama, Tennessee.
                                      Area =     2890 sq.mi.
                        06030003 -- Upper Elk. Alabama, Tennessee.
                                      Area =     1270 sq.mi.
                        06030004 -- Lower Elk. Alabama, Tennessee.
                                      Area =      950 sq.mi.
                        06030005 -- Pickwick Lake. Alabama, Mississippi,
                                    Tennessee.
                                      Area =     2270 sq.mi.
                        06030006 -- Bear. Alabama, Mississippi.
                                      Area =      930 sq.mi.


  Subregion  0604 -- Lower Tennessee: The Tennessee River Basin below
                     Pickwick Dam. Kentucky, Mississippi, Tennessee.
                       Area =     8010 sq.mi.

    Accounting Unit 060400 -- Lower Tennessee: Kentucky, Mississippi,
                              Tennessee.
                                Area =     8010 sq.mi.

      Cataloging Units  06040001 -- Lower Tennessee-Beech. Mississippi,
                                    Tennessee.
                                      Area =     2080 sq.mi.
                        06040002 -- Upper Duck. Tennessee.
                                      Area =     1160 sq.mi.
                        06040003 -- Lower Duck. Tennessee.
                                      Area =     1540 sq.mi.
                        06040004 -- Buffalo. Tennessee.
                                      Area =      731 sq.mi.
                        06040005 -- Kentucky Lake. Kentucky, Tennessee.
                                      Area =     1810 sq.mi.
                        06040006 -- Lower Tennessee. Kentucky,
                                    Tennessee.
                                      Area =      689 sq.mi.


Region 07  Upper Mississippi Region -- The drainage of the Mississippi
           River Basin above the confluence with the Ohio River,
           excluding the Missouri River Basin. Includes parts of
           Illinois, Indiana, Iowa, Michigan, Minnesota,
           Missouri, South Dakota, and Wisconsin.


  Subregion  0701 -- Mississippi Headwaters: The Mississippi River Basin
                     above the confluence with the St. Croix River
                     Basin, excluding the Minnesota River Basin.
                     Minnesota.
                       Area =    20200 sq.mi.

    Accounting Unit 070101 -- Mississippi Headwaters: The Mississippi
                              River Basin above Blanchard Dam.
                              Minnesota.
                                Area =    11700 sq.mi.

      Cataloging Units  07010101 -- Mississippi Headwaters. Minnesota.
                                      Area =     2010 sq.mi.
                        07010102 -- Leech Lake. Minnesota.
                                      Area =     1390 sq.mi.
                        07010103 -- Prairie-Willow. Minnesota.
                                      Area =     2060 sq.mi.
                        07010104 -- Elk-Nokasippi. Minnesota.
                                      Area =     1680 sq.mi.
                        07010105 -- Pine. Minnesota.
                                      Area =      774 sq.mi.
                        07010106 -- Crow Wing. Minnesota.
                                      Area =     1970 sq.mi.
                        07010107 -- Redeye. Minnesota.
                                      Area =      893 sq.mi.
                        07010108 -- Long Prairie. Minnesota.
                                      Area =      904 sq.mi.

    Accounting Unit 070102 -- Upper Mississippi-Crow-Rum: The
                              Mississippi River Basin below Blanchard
                              Dam and above the confluence with the
                              St. Croix River Basin, excluding the
                              Minnesota River Basin. Minnesota.
                                Area =     8520 sq.mi.

      Cataloging Units  07010201 -- Platte-Spunk. Minnesota.
                                      Area =     1020 sq.mi.
                        07010202 -- Sauk. Minnesota.
                                      Area =     1020 sq.mi.
                        07010203 -- Clearwater-Elk. Minnesota.
                                      Area =     1100 sq.mi.
                        07010204 -- Crow. Minnesota.
                                      Area =     1460 sq.mi.
                        07010205 -- South Fork Crow. Minnesota.
                                      Area =     1280 sq.mi.
                        07010206 -- Twin Cities. Minnesota.
                                      Area =     1080 sq.mi.
                        07010207 -- Rum. Minnesota.
                                      Area =     1560 sq.mi.


  Subregion  0702 -- Minnesota: The Minnesota River Basin. Iowa,
                     Minnesota, South Dakota.
                       Area =    16800 sq.mi.

    Accounting Unit 070200 -- Minnesota. Iowa, Minnesota, South Dakota.
                                Area =    16800 sq.mi.

      Cataloging Units  07020001 -- Upper Minnesota. Minnesota,
                                    South Dakota.
                                      Area =     1980 sq.mi.
                        07020002 -- Pomme De Terre. Minnesota.
                                      Area =      901 sq.mi.
                        07020003 -- Lac Qui Parle. South Dakota,
                                    Minnesota.
                                      Area =     1070 sq.mi.
                        07020004 -- Hawk-Yellow Medicine. Minnesota.
                                      Area =     2040 sq.mi.
                        07020005 -- Chippewa. Minnesota.
                                      Area =     2070 sq.mi.
                        07020006 -- Redwood. Minnesota.
                                      Area =      715 sq.mi.
                        07020007 -- Middle Minnesota. Minnesota.
                                      Area =     1360 sq.mi.
                        07020008 -- Cottonwood. Minnesota.
                                      Area =     1290 sq.mi.
                        07020009 -- Blue Earth. Iowa, Minnesota.
                                      Area =     1570 sq.mi.
                        07020010 -- Watonwan. Minnesota.
                                      Area =      835 sq.mi.
                        07020011 -- Le Sueur. Minnesota.
                                      Area =     1110 sq.mi.
                        07020012 -- Lower Minnesota. Minnesota.
                                      Area =     1810 sq.mi.


  Subregion  0703 -- St. Croix: The St. Croix River Basin. Minnesota,
                     Wisconsin.
                       Area =     7750 sq.mi.

    Accounting Unit 070300 -- St. Croix. Minnesota, Wisconsin.
                                Area =     7750 sq.mi.

      Cataloging Units  07030001 -- Upper St. Croix. Minnesota,
                                    Wisconsin.
                                      Area =     2030 sq.mi.
                        07030002 -- Namekagon. Wisconsin.
                                      Area =     1030 sq.mi.
                        07030003 -- Kettle. Minnesota.
                                      Area =     1060 sq.mi.
                        07030004 -- Snake. Minnesota.
                                      Area =     1020 sq.mi.
                        07030005 -- Lower St. Croix. Minnesota,
                                    Wisconsin.
                                      Area =     2610 sq.mi.


  Subregion  0704 -- Upper Mississippi-Black-Root: The Mississippi River
                     Basin below the confluence with the St. Croix River
                     Basin to and including the Root River Basin west of
                     the Mississippi River and the La Crosse River Basin
                     east of the Mississippi River, excluding the
                     Chippewa River Basin. Iowa, Minnesota, Wisconsin.
                       Area =    10700 sq.mi.

    Accounting Unit 070400 -- Upper Mississippi-Black-Root. Iowa,
                              Minnesota, Wisconsin.
                                Area =    10700 sq.mi.

      Cataloging Units  07040001 -- Rush-Vermillion. Minnesota,
                                    Wisconsin.
                                      Area =     1100 sq.mi.
                        07040002 -- Cannon. Minnesota.
                                      Area =     1480 sq.mi.
                        07040003 -- Buffalo-Whitewater. Minnesota,
                                    Wisconsin.
                                      Area =     1370 sq.mi.
                        07040004 -- Zumbro. Minnesota.
                                      Area =     1430 sq.mi.
                        07040005 -- Trempealeau. Wisconsin.
                                      Area =      720 sq.mi.
                        07040006 -- La Crosse-Pine. Minnesota,
                                    Wisconsin.
                                      Area =      678 sq.mi.
                        07040007 -- Black. Wisconsin.
                                      Area =     2270 sq.mi.
                        07040008 -- Root. Iowa, Minnesota.
                                      Area =     1670 sq.mi.


   Suregion  0705 -- Chippewa: The Chippewa River Basin. Michigan,
                     Wisconsin.
                       Area =     9570 sq.mi.

    Accounting Unit 070500 -- Chippewa. Michigan, Wisconsin.
                                Area =     9570 sq.mi.

      Cataloging Units  07050001 -- Upper Chippewa. Wisconsin.
                                      Area =     1940 sq.mi.
                        07050002 -- Flambeau. Michigan, Wisconsin.
                                      Area =     1190 sq.mi.
                        07050003 -- South Fork Flambeau. Wisconsin.
                                      Area =      767 sq.mi.
                        07050004 -- Jump. Wisconsin.
                                      Area =      848 sq.mi.
                        07050005 -- Lower Chippewa. Wisconsin.
                                      Area =     2040 sq.mi.
                        07050006 -- Eau Claire. Wisconsin.
                                      Area =      871 sq.mi.
                        07050007 -- Red Cedar. Wisconsin.
                                      Area =     1910 sq.mi.


  Subregion  0706 -- Upper Mississippi-Maquoketa-Plum: The Mississippi
                     River Basin below the Root River Basin west of the
                     Mississippi River and the La Crosse River Basin east
                     of the Mississippi River to Lock and Dam 13,
                     excluding the Wisconsin River Basin. Illinois,
                     Iowa, Minnestoa, Wisconsin.
                       Area =     8610 sq.mi.

    Accounting Unit 070600 -- Upper Mississippi-Maquoketa-Plum.
                              Illinois, Iowa, Minnesota, Wisconsin.
                                Area =     8610 sq.mi.

      Cataloging Units  07060001 -- Coon-Yellow. Iowa, Minnesota,
                                    Wisconsin.
                                      Area =     1440 sq.mi.
                        07060002 -- Upper Iowa. Iowa, Minnesota.
                                      Area =     1010 sq.mi.
                        07060003 -- Grant-Little Maquoketa. Iowa,
                                    Wisconsin.
                                      Area =     1110 sq.mi.
                        07060004 -- Turkey. Iowa.
                                      Area =     1690 sq.mi.
                        07060005 -- Apple-Plum. Illinois, Iowa,
                                    Wisconsin.
                                      Area =     1490 sq.mi.
                        07060006 -- Maquoketa. Iowa.
                                      Area =     1870 sq.mi.


  Subregion  0707 -- Wisconsin: The Wisconsin River Basin. Michigan,
                     Wisconsin.
                       Area =    11900 sq.mi.

    Accounting Unit 070700 -- Wisconsin. Michigan, Wisconsin.
                                Area =    11900 sq.mi.

      Cataloging Units  07070001 -- Upper Wisconsin. Michigan,
                                    Wisconsin.
                                      Area =     2190 sq.mi.
                        07070002 -- Lake Dubay. Wisconsin.
                                      Area =     2690 sq.mi.
                        07070003 -- Castle Rock. Wisconsin.
                                      Area =     3250 sq.mi.
                        07070004 -- Baraboo. Wisconsin.
                                      Area =      660 sq.mi.
                        07070005 -- Lower Wisconsin. Wisconsin.
                                      Area =     2360 sq.mi.
                        07070006 -- Kickapoo. Wisconsin.
                                      Area =      753 sq.mi.


  Subregion  0708 -- Upper Mississippi-Iowa-Skunk-Wapsipinicon: The
                     Mississippi River Basin below Lock and Dam 13 to
                     the confluence with the Des Moines River Basin,
                     excluding the Rock River Basin. Illinois, Iowa,
                     Minnesota.
                       Area =    22800 sq.mi.

    Accounting Unit 070801 -- Upper Mississippi-Skunk-Wapsipinicon:
                              the Mississippi River Basin below Lock and
                              Dam 13 to the confluence with the
                              Des Moines River Basin, excluding the
                              Iowa and Rock River Basins. Illinois,
                              Iowa, Minnesota.
                                Area =    10200 sq.mi.

      Cataloging Units  07080101 -- Copperas-Duck. Illinois, Iowa.
                                      Area =     1040 sq.mi.
                        07080102 -- Upper Wapsipinicon. Iowa, Minnesota.
                                      Area =     1550 sq.mi.
                        07080103 -- Lower Wapsipinicon. Iowa.
                                      Area =      967 sq.mi.
                        07080104 -- Flint-Henderson. Illinois, Iowa.
                                      Area =     2350 sq.mi.
                        07080105 -- South Skunk. Iowa.
                                      Area =     1840 sq.mi.
                        07080106 -- North Skunk. Iowa.
                                      Area =      883 sq.mi.
                        07080107 -- Skunk. Iowa.
                                      Area =     1610 sq.mi.

    Accounting Unit 070802 -- Iowa: The Iowa River Basin. Iowa,
                              Minnesota.
                                Area =    12600 sq.mi.

      Cataloging Units  07080201 -- Upper Cedar. Iowa, Minnesota.
                                      Area =     1730 sq.mi.
                        07080202 -- Shell Rock. Iowa, Minnesota.
                                      Area =     1060 sq.mi.
                        07080203 -- Winnebago. Iowa, Minnesota.
                                      Area =      704 sq.mi.
                        07080204 -- West Fork Cedar. Iowa.
                                      Area =      850 sq.mi.
                        07080205 -- Middle Cedar. Iowa.
                                      Area =     2410 sq.mi.
                        07080206 -- Lower Cedar. Iowa.
                                      Area =     1060 sq.mi.
                        07080207 -- Upper Iowa. Iowa.
                                      Area =     1430 sq.mi.
                        07080208 -- Middle Iowa. Iowa.
                                      Area =     1670 sq.mi.
                        07080209 -- Lower Iowa. Iowa.
                                      Area =     1670 sq.mi.


  Subregion  0709 -- Rock: The Rock River Basin. Illinois, Wisconsin.
                       Area =    10900 sq.mi.

    Accounting Unit 070900 -- Rock. Illinois, Wisconsin.
                                Area =    10900 sq.mi.

      Cataloging Units  07090001 -- Upper Rock. Illinois, Wisconsin.
                                      Area =     2920 sq.mi.
                        07090002 -- Crawfish. Wisconsin.
                                      Area =      788 sq.mi.
                        07090003 -- Pecatonica. Illinois, Wisconsin.
                                      Area =     1870 sq.mi.
                        07090004 -- Sugar. Illinois, Wisconsin.
                                      Area =      748 sq.mi.
                        07090005 -- Lower Rock. Illinois, Wisconsin.
                                      Area =     2180 sq.mi.
                        07090006 -- Kishwaukee. Illinois, Wisconsin.
                                      Area =     1260 sq.mi.
                        07090007 -- Green. Illinois.
                                      Area =     1120 sq.mi.


  Subregion  0710 -- Des Moines: The Des Moines River Basin. Iowa,
                     Minnesota, Missouri.
                       Area =    14400 sq.mi.

    Accounting Unit 071000 -- Des Moines. Iowa, Minnesota, Missouri.
                                Area =    14400 sq.mi.

      Cataloging Units  07100001 -- Des Moines Headwaters. Minnesota.
                                      Area =     1250 sq.mi.
                        07100002 -- Upper Des Moines. Iowa, Minnesota.
                                      Area =     1100 sq.mi.
                        07100003 -- East Fork Des Moines. Iowa,
                                    Minnesota.
                                      Area =     1310 sq.mi.
                        07100004 -- Middle Des Moines. Iowa.
                                      Area =     1690 sq.mi.
                        07100005 -- Boone. Iowa.
                                      Area =      910 sq.mi.
                        07100006 -- North Raccoon. Iowa.
                                      Area =     2460 sq.mi.
                        07100007 -- South Raccoon. Iowa.
                                      Area =     1130 sq.mi.
                        07100008 -- Lake Red Rock. Iowa.
                                      Area =     2400 sq.mi.
                        07100009 -- Lower Des Moines. Iowa, Missouri.
                                      Area =     2110 sq.mi.


  Subregion  0711 -- Upper Mississippi-Salt: The Mississippi River Basin
                     below the confluence with the Des Moines River
                     Basin to the confluence with the Missouri River
                     Basin, excluding the Illinois River Basin.
                     Illinois, Iowa, Missouri.
                       Area =     9970 sq.mi.

    Accounting Unit 071100 -- Upper Mississippi-Salt. Illinois, Iowa,
                              Missouri.
                                Area =     9970 sq.mi.

      Cataloging Units  07110001 -- Bear-Wyaconda. Illinois, Iowa,
                                    Missouri.
                                      Area =     1710 sq.mi.
                        07110002 -- North Fabius. Iowa, Missouri.
                                      Area =      930 sq.mi.
                        07110003 -- South Fabius. Missouri.
                                      Area =      623 sq.mi.
                        07110004 -- The Sny. Illinois, Missouri.
                                      Area =     1960 sq.mi.
                        07110005 -- North Fork Salt. Missouri.
                                      Area =      895 sq.mi.
                        07110006 -- South Fork Salt. Missouri.
                                      Area =     1190 sq.mi.
                        07110007 -- Salt. Missouri.
                                      Area =      780 sq.mi.
                        07110008 -- Cuivre. Missouri.
                                      Area =     1250 sq.mi.
                        07110009 -- Peruque-Piasa. Illinois, Missouri.
                                      Area =      633 sq.mi.


  Subregion  0712 -- Upper Illinois: The Illinois River Basin above the
                     confluence of and including the Fox River Basin.
                     Illinois, Indiana, Michigan, Wisconsin.
                       Area =    10900 sq.mi.

    Accounting Unit 071200 -- Upper Illinois. Illinois, Indiana,
                              Michigan, Wisconsin.
                                Area =    10900 sq.mi.

      Cataloging Units  07120001 -- Kankakee. Illinois, Indiana,
                                    Michigan.
                                      Area =     3010 sq.mi.
                        07120002 -- Iroquois. Illinois, Indiana.
                                      Area =     2110 sq.mi.
                        07120003 -- Chicago. Illinois, Indiana.
                                      Area =      622 sq.mi.
                        07120004 -- Des Plaines. Illinois, Wisconsin.
                                      Area =     1440 sq.mi.
                        07120005 -- Upper Illinois. Illinois.
                                      Area =     1010 sq.mi.
                        07120006 -- Upper Fox. Illinois, Wisconsin.
                                      Area =     1570 sq.mi.
                        07120007 -- Lower Fox. Illinois.
                                      Area =     1090 sq.mi.


  Subregion  0713 -- Lower Illinois: The Illinois River Basin below the
                     confluence of the Fox River Basin. Illinois.
                       Area =    17700 sq.mi.

    Accounting Unit 071300 -- Lower Illinois. Illinois.
                                Area =    17700 sq.mi.

      Cataloging Units  07130001 -- Lower Illinois-Senachwine Lake.
                                    Illinois.
                                      Area =     1950 sq.mi.
                        07130002 -- Vermilion. Illinois.
                                      Area =     1290 sq.mi.
                        07130003 -- Lower Illinois-Lake Chautauqua.
                                    Illinois.
                                      Area =     1520 sq.mi.
                        07130004 -- Mackinaw. Illinois.
                                      Area =     1130 sq.mi.
                        07130005 -- Spoon. Illinois.
                                      Area =     1860 sq.mi.
                        07130006 -- Upper Sangamon. Illinois.
                                      Area =     1420 sq.mi.
                        07130007 -- South Fork Sangamon. Illinois.
                                      Area =     1130 sq.mi.
                        07130008 -- Lower Sangamon. Illinois.
                                      Area =      928 sq.mi.
                        07130009 -- Salt. Illinois.
                                      Area =     1890 sq.mi.
                        07130010 -- La Moine. Illinois.
                                      Area =     1340 sq.mi.
                        07130011 -- Lower Illinois. Illinois.
                                      Area =     2280 sq.mi.
                        07130012 -- Macoupin. Illinois.
                                      Area =      966 sq.mi.


  Subregion  0714 -- Upper Mississippi-Kaskaskia-Meramec: The
                     Mississippi River Basin below the confluence with
                     and excluding the Missouri River Basin to the
                     confluence with the Ohio River. Illinois, Missouri.
                       Area =    16900 sq.mi.

    Accounting Unit 071401 -- Upper Mississippi-Meramec: The
                              Mississippi River Basin below the
                              confluence with and excluding the Missouri
                              River Basin to the confluence with the
                              Ohio River, excluding the Kaskaskia River
                              Basin. Illinois, Missouri.
                                Area =    11200 sq.mi.

      Cataloging Units  07140101 -- Cahokia-Joachim. Illinois, Missouri.
                                      Area =     1650 sq.mi.
                        07140102 -- Meramec. Missouri.
                                      Area =     2130 sq.mi.
                        07140103 -- Bourbeuse. Missouri.
                                      Area =      838 sq.mi.
                        07140104 -- Big. Missouri.
                                      Area =      955 sq.mi.
                        07140105 -- Upper Mississippi-Cape Girardeau.
                                    Illinois. Missouri.
                                      Area =     1690 sq.mi.
                        07140106 -- Big Muddy. Illinois.
                                      Area =     2350 sq.mi.
                        07140107 -- Whitewater. Missouri.
                                      Area =     1210 sq.mi.
                        07140108 -- Cache. Illinois.
                                      Area =      352 sq.mi.

    Accounting Unit 071402 -- Kaskaskia: The Kaskaskia River Basin.
                              Illinois.
                                Area =     5700 sq.mi.

      Cataloging Units  07140201 -- Upper Kaskaskia. Illinois.
                                      Area =     1540 sq.mi.
                        07140202 -- Middle Kaskaskia. Illinois.
                                      Area =     1680 sq.mi.
                        07140203 -- Shoal. Illinois.
                                      Area =      879 sq.mi.
                        07140204 -- Lower Kaskaskia. Illinois.
                                      Area =     1600 sq.mi.


Region 08  Lower Mississippi Region -- The drainage of: (a) the
           Mississippi River below its confluence with the Ohio River,
           excluding the Arkansas, Red, and White River Basins
           above the points of highest backwater effect of the
           Mississippi River in those basins; and (b) coastal streams
           that ultimately discharge into the Gulf of Mexico from the
           Pearl River Basin boundary to the Sabine River and Sabine Lake
           drainage boundary. Includes parts of Arkansas, Kentucky
           Louisiana, Mississippi, Missouri, and Tennessee.


  Subregion  0801 -- Lower Mississippi-Hatchie: The Mississippi River
                     Basin from the confluence of the Ohio River
                     to and including the Horn Lake Creek
                     Basin, but excluding the drainage west of the
                     West-Bank Levee along the Mississippi River.
                     Arkansas, Kentucky, Mississippi, Missouri, and
                     Tennessee.
                       Area =    11000 sq.mi.

    Accounting Unit 080101 -- Lower Mississippi-Memphis: The
                              Mississippi alluvial lands lying in the
                              flood plain of the present channel of the
                              Mississippi River between the West-Bank
                              Levee and the drainage Boundaries of the
                              Major Tributaries along the East Bank,
                              from the confluence of the Ohio River to
                              Horn Lake Creek. Arkansas, Kentucky,
                              Mississippi, Missouri, and Tennessee.
                                Area =     1110 sq.mi.

      Cataloging Unit   08010100 -- Lower Mississippi-Memphis. Arkansas,
                                    Kentucky, Mississippi, Missouri,
                                    and Tennessee.
                                      Area =     1110 sq.mi.

    Accounting Unit 080102 -- Hatchie-Obion: The drainage basins east of
                              the Mississippi River from the Ohio River
                              Basin to and including the Horn Lake Creek
                              Basin, but excluding the alluvial
                              lands lying in the flood plain of the
                              present channel of the Mississippi River
                              east of the West-Bank Levee.
                              Kentucky, Mississippi, and Tennessee.
                                Area =     9910 sq.mi.

      Cataloging Units  08010201 -- Bayou De Chien-Mayfield. Kentucky,
                                    Tennessee.
                                      Area =      957 sq.mi.
                        08010202 -- Obion. Kentucky, Tennessee.
                                      Area =     1310 sq.mi.
                        08010203 -- South Fork Obion. Tennessee.
                                      Area =     1150 sq.mi.
                        08010204 -- North Fork Forked Deer. Tennessee.
                                      Area =      952 sq.mi.
                        08010205 -- South Fork Forked Deer. Tennessee.
                                      Area =     1050 sq.mi.
                        08010206 -- Forked Deer. Tennessee.
                                      Area =       70 sq.mi.
                        08010207 -- Upper Hatchie. Mississippi,
                                    Tennessee.
                                      Area =     1130 sq.mi.
                        08010208 -- Lower Hatchie. Mississippi,
                                    Tennessee.
                                      Area =     1460 sq.mi.
                        08010209 -- Loosahatchie. Tennessee.
                                      Area =      736 sq.mi.
                        08010210 -- Wolf. Mississippi, Tennessee.
                                      Area =      813 sq.mi.
                        08010211 -- Horn Lake-Nonconnah. Mississippi,
                                    Tennessee.
                                      Area =      281 sq.mi.


  Subregion  0802 -- Lower Mississippi - St. Francis: The Mississippi
                     River Basin from the Horn Lake Creek Basin
                     on the east bank to and including the Arkansas and
                     White River Basins below the points of highest
                     backwater effect of the Mississippi River; excluding
                     all drainage east of the East-Bank Levee below the
                     Horn Lake Creek Basin.
                     Arkansas, Mississippi, and Missouri.
                       Area =    16700 sq.mi.

    Accounting Unit 080201 -- Lower Mississippi-Helena: The Mississippi
                              alluvial lands lying in the flood plain of
                              the present channel of the Mississippi
                              River between the East-Bank Levee and the
                              levees or the drainage boundaries of the
                              major tributaries along the west bank,
                              from Horn Lake Creek to the Arkansas River.
                              Arkansas, Mississippi.
                                Area =      566 sq.mi.

      Cataloging Unit   08020100 -- Lower Mississippi-Helena. Arkansas,
                                    Mississippi.
                                      Area =      566 sq.mi.

    Accounting Unit 080202 -- St. Francis: The St. Francis River Basin
                              and all man-made diversions into the
                              Basin. Arkansas, Missouri.
                                Area =     9040 sq.mi.

      Cataloging Units  08020201 -- New Madrid-St. Johns. Missouri.
                                      Area =      703 sq.mi.
                        08020202 -- Upper St. Francis. Missouri.
                                      Area =     1280 sq.mi.
                        08020203 -- Lower St. Francis. Arkansas,
                                    Missouri.
                                      Area =     3480 sq.mi.
                        08020204 -- Little River Ditches. Arkansas, Missouri.
                                      Area =     2620 sq.mi.
                        08020205 -- L'anguille. Arkansas.
                                      Area =      961 sq.mi.

    Accounting Unit 080203 -- Lower White: The White River Basin below
                              the Little Red River Basin.
                              Arkansas, Missouri.
                                Area =     5410 sq.mi.

      Cataloging Units  08020301 -- Lower White-Bayou Des Arc. Arkansas.
                                      Area =     1110 sq.mi.
                        08020302 -- Cache. Arkansas, Missouri.
                                      Area =     2000 sq.mi.
                        08020303 -- Lower White. Arkansas.
                                      Area =     1360 sq.mi.
                        08020304 -- Big. Arkansas.
                                      Area =      943 sq.mi.

    Accounting Unit 080204 -- Lower Arkansas: The Arkansas River Basin
                              below the Plum Bayou Basin.
                              Arkansas.
                                Area =     1690 sq.mi.

      Cataloging Units  08020401 -- Lower Arkansas. Arkansas.
                                      Area =      700 sq.mi.
                        08020402 -- Bayou Meto. Arkansas.
                                      Area =      993 sq.mi.


  Subregion  0803 -- Lower Mississippi - Yazoo: The Mississippi River
                     Basin from the Arkansas River Basin to and
                     including the Yazoo River Basin; excluding all
                     drainage west of the West-Bank Levee below the
                     Arkansas River Basin. Arkansas, Louisiana,
                     Mississippi, and Tennessee.
                       Area =    14100 sq.mi.

    Accounting Unit 080301 -- Lower Mississippi-Greenville: The
                              Mississippi alluvial lands lying in the
                              flood plain of the present channel of the
                              Mississippi River between the East-Bank
                              and the West-Bank Levees, from the Arkansas
                              River to the Yazoo River. Arkansas,
                              Mississippi.
                                Area =      629 sq.mi.

      Cataloging Unit   08030100 -- Lower Mississippi-Greenville.
                                   Arkansas, Louisiana, Mississippi.
                                      Area =      629 sq.mi.

    Accounting Unit 080302 -- Yazoo: The Yazoo River Basin. Louisiana,
                              Mississippi, Tennessee.
                                Area =    13500 sq.mi.

      Cataloging Units  08030201 -- Little Tallahatchie. Mississippi.
                                      Area =     1640 sq.mi.
                        08030202 -- Tallahatchie. Mississippi.
                                      Area =     1010 sq.mi.
                        08030203 -- Yocona. Mississippi.
                                      Area =      752 sq.mi.
                        08030204 -- Coldwater. Mississippi, Tennessee.
                                      Area =     1920 sq.mi.
                        08030205 -- Yalobusha. Mississippi.
                                      Area =     2310 sq.mi.
                        08030206 -- Upper Yazoo. Mississippi.
                                      Area =     1560 sq.mi.
                        08030207 -- Big Sunflower. Mississippi.
                                      Area =     3120 sq.mi.
                        08030208 -- Lower Yazoo. Louisiana, Mississippi.
                                      Area =      222 sq.mi.
                        08030209 -- Deer-Steele. Louisiana, Mississippi.
                                      Area =      938 sq.mi.


  Subregion  0804 -- Lower Red - Ouachita: The Red River Basin below the
                     Bayou Rigolette Basin, excluding the Boeuf
                     and Tensas River Basins. Arkansas, Louisiana.
                       Area =    20500 sq.mi.

    Accounting Unit 080401 -- Upper Ouachita: The Ouachita River Basin
                              above the Two Bayou Basin.
                              Arkansas.
                                Area =     5380 sq.mi.

      Cataloging Units  08040101 -- Ouachita Headwaters. Arkansas.
                                      Area =     1550 sq.mi.
                        08040102 -- Upper Ouachita. Arkansas.
                                      Area =     1750 sq.mi.
                        08040103 -- Little Missouri. Arkansas.
                                      Area =     2080 sq.mi.

    Accounting Unit 080402 -- Lower Ouachita: The Ouachita River Basin
                              below and including the Two Bayou
                              Basin. Arkansas, Louisiana.
                                Area =    10700 sq.mi.

      Cataloging Units  08040201 -- Lower Ouachita-Smackover. Arkansas.
                                      Area =     1810 sq.mi.
                        08040202 -- Lower Ouachita-Bayou De Loutre.
                                    Arkansas, Louisiana.
                                      Area =     1300 sq.mi.
                        08040203 -- Upper Saline. Arkansas.
                                      Area =     1710 sq.mi.
                        08040204 -- Lower Saline. Arkansas.
                                      Area =     1510 sq.mi.
                        08040205 -- Bayou Bartholomew. Arkansas,
                                    Louisiana.
                                      Area =     1680 sq.mi.
                        08040206 -- Bayou D'arbonne. Arkansas,
                                    Louisiana.
                                      Area =     1930 sq.mi.
                        08040207 -- Lower Ouachita. Louisiana.
                                      Area =      759 sq.mi.

    Accounting Unit 080403 -- Lower Red: The Red River Basin below the
                              Bayou Rigolette Basin, excluding
                              the Boeuf, Ouachita, and Tensas River
                              Basins. Louisiana.
                                Area =     4400 sq.mi.

      Cataloging Units  08040301 -- Lower Red. Louisiana.
                                      Area =      898 sq.mi.
                        08040302 -- Castor. Louisiana.
                                      Area =      966 sq.mi.
                        08040303 -- Dugdemona. Louisiana.
                                      Area =      927 sq.mi.
                        08040304 -- Little. Louisiana.
                                      Area =      987 sq.mi.
                        08040305 -- Black. Louisiana.
                                      Area =       84 sq.mi.
                        08040306 -- Bayou Cocodrie. Louisiana.
                                      Area =      542 sq.mi.


  Subregion  0805 -- Boeuf-Tensas: The Boeuf and Tensas River Basins.
                     Arkansas, Louisiana.
                       Area =     5300 sq.mi.

    Accounting Unit 080500 -- Boeuf-Tensas. Arkansas, Louisiana.
                                Area =     5300 sq.mi.

      Cataloging Units  08050001 -- Boeuf. Arkansas, Louisiana.
                                      Area =     2890 sq.mi.
                        08050002 -- Bayou Macon. Arkansas, Louisiana.
                                      Area =     1060 sq.mi.
                        08050003 -- Tensas. Louisiana.
                                      Area =     1350 sq.mi.


  Subregion  0806 -- Lower Mississippi - Big Black: The Mississippi
                     River Basin from the Yazoo River Basin to the Lower
                     Old River drainage boundary, but excluding all the
                     drainage west of the West-Bank Levee along the
                     Mississippi River. Louisiana, Mississippi.
                       Area =     7100 sq.mi.

    Accounting Unit 080601 -- Lower Mississippi-Natchez: The Mississippi
                              alluvial lands lying in the flood plain of
                              the present channel of the Mississippi
                              River between the West-Bank Levee and the
                              drainage Boundaries of the major
                              tributaries along the East Bank, from the
                              the Yazoo River to the Lower Old River.
                              Louisiana, Mississippi.
                                Area =      548 sq.mi.

      Cataloging Unit   08060100 -- Lower Mississippi-Natchez. Louisiana,
                                    Mississippi.
                                      Area =      548 sq.mi.

    Accounting Unit 080602 -- Big Black - Homochitto: The drainage
                              Basins east of the Mississippi River from
                              the Yazoo River Basin to and including the
                              Buffalo River Basin, but excluding
                              the alluvial lands lying in the flood plain
                              of the present channel of the Mississippi
                              River east of West-Bank Levee.
                              Louisiana, Mississippi.
                                Area =     6550 sq.mi.

      Cataloging Units  08060201 -- Upper Big Black. Mississippi.
                                      Area =     1470 sq.mi.
                        08060202 -- Lower Big Black. Louisiana,
                                    Mississippi.
                                      Area =     1900 sq.mi.
                        08060203 -- Bayou Pierre. Louisiana,
                                    Mississippi.
                                      Area =     1070 sq.mi.

                        08060204 -- Coles Creek. Louisiana, Mississippi.
                                      Area =      551 sq.mi.
                        08060205 -- Homochitto. Mississippi.
                                      Area =     1220 sq.mi.
                        08060206 -- Buffalo. Mississippi.
                                      Area =      343 sq.mi.


  Subregion  0807 -- Lower Mississippi-Lake Maurepas: The Mississippi
                     River Basin from the Lower Old River drainage
                     boundary to the Bonnet Carre Floodway, and including
                     the Lower Grand River Basin west of the
                     West-Bank Levee. Louisiana, Mississippi.
                       Area =     5870 sq.mi.

    Accounting Unit 080701 -- Lower Mississippi-Baton Rouge: The
                              Mississippi alluvial lands lying in the
                              flood plain of the present channel of the
                              Mississippi River between the West-Bank
                              Levee and the East-Bank Levee or the
                              drainage boundaries of the major
                              tributaries along the east bank, from the
                              Lower Old River to the Bonnet Carre
                              Floodway. Louisiana.
                                Area =      270 sq.mi.

      Cataloging Unit   08070100 -- Lower Mississippi-Baton Rouge.
                                    Louisiana.
                                      Area =      270 sq.mi.

    Accounting Unit 080702 -- Lake Maurepas: The drainage basins east of
                              the Mississippi River from the Buffalo
                              River Basin to the Bonnet Carre
                              Floodway, but excluding the Mississippi
                              alluvial lands east of the West-Bank Levee;
                              and including drainage from the north into
                              Lake Pontchartrain, east to and including
                              the Tangipahoa River Basin.
                              Louisiana, Mississippi.
                                Area =     4810 sq.mi.

      Cataloging Units  08070201 -- Bayou Sara-Thompson. Louisiana,
                                    Mississippi.
                                      Area =      698 sq.mi.
                        08070202 -- Amite. Louisiana, Mississippi.
                                      Area =     1890 sq.mi.
                        08070203 -- Tickfaw. Louisiana, Mississippi.
                                      Area =      729 sq.mi.
                        08070204 -- Lake Maurepas. Louisiana.
                                      Area =      719 sq.mi.
                        08070205 -- Tangipahoa. Louisiana, Mississippi.
                                      Area =      771 sq.mi.

    Accounting Unit 080703 -- Lower Grand: The Lower Grand River Basin.
                              Louisiana.
                                Area =      792 sq.mi.

      Cataloging Unit   08070300 -- Lower Grand. Louisiana.
                                      Area =      792 sq.mi.


  Subregion  0808 -- Louisiana Coastal: The Louisiana coastal drainage,
                     including islands and associated waters, south of
                     the Red River Basin boundary and west of the
                     East-Bank Levee of the Atchafalaya Basin Floodway,
                     to the Sabine River and Sabine Lake drainage
                     boundary. Louisiana.
                       Area =    14000 sq.mi.

    Accounting Unit 080801 -- Atchafalaya - Vermilion: The Louisiana
                              Coastal drainage, including islands and
                              associated waters, south of the Red River
                              Basin boundary and west of the East-Bank
                              Levee of the Atchafalaya Basin Floodway, to
                              and including the drainage into Vermilion
                              Bay. Louisiana.
                                Area =     5900 sq.mi.

      Cataloging Units  08080101 -- Atchafalaya. Louisiana.
                                      Area =     1930 sq.mi.
                        08080102 -- Bayou Teche. Louisiana.
                                      Area =     2210 sq.mi.
                        08080103 -- Vermilion. Louisiana.
                                      Area =     1760 sq.mi.

    Accounting Unit 080802 -- Calcasieu - Mermentau: The Louisiana
                              Coastal drainage and associated waters,
                              from the Vermilion Bay drainage boundary
                              to the Sabine River and Sabine Lake
                              drainage boundary. Louisiana.
                                Area =     8120 sq.mi.

      Cataloging Units  08080201 -- Mermentau Headwaters. Louisiana.
                                      Area =     1400 sq.mi.
                        08080202 -- Mermentau. Louisiana.
                                      Area =     2390 sq.mi.
                        08080203 -- Upper Calcasieu. Louisiana.
                                      Area =     1550 sq.mi.
                        08080204 -- Whisky Chitto. Louisiana.
                                      Area =      884 sq.mi.
                        08080205 -- West Fork Calcasieu. Louisiana.
                                      Area =      818 sq.mi.
                        08080206 -- Lower Calcasieu. Louisiana.
                                      Area =     1080 sq.mi.


  Subregion  0809 -- Lower Mississippi: The Mississippi River below the
                     Bonnet Carre Floodway, and the Coastal drainage,
                     including islands and associated waters, from the
                     Pearl River Basin boundary and the Mississippi-
                     Louisiana state line to the East-Bank Levee of the
                     Atchafalaya Basin Floodway, excluding the drainage
                     from the north into Lake Pontchartrain, east to the
                     Tchefuncta River drainage boundary; and excluding
                     the Lower Grand River Basin. Louisiana.
                       Area =     9460 sq.mi.

    Accounting Unit 080901 -- Lower Mississippi-New Orleans: The
                              Mississippi River below the Bonnet Carre
                              Floodway,including the Mississippi Delta.
                              Louisiana.
                                Area =      587 sq.mi.

      Cataloging Unit   08090100 -- Lower Mississippi-New Orleans.
                                    Louisiana.
                                      Area =      587 sq.mi.

    Accounting Unit 080902 -- Lake Pontchartrain: Lake Pontchartrain and
                              the Coastal drainage, including islands
                              and associated waters, from the Pearl
                              River Basin boundary and the Mississippi-
                              Louisiana state line to the East-Bank
                              Levee of the Mississippi River, excluding
                              the drainage from the north into Lake
                              Pontchartrain, East to the Tchefuncta
                              River drainage boundary. Louisiana.
                                Area =     3520 sq.mi.

      Cataloging Units  08090201 -- Liberty Bayou-Tchefuncta. Louisiana.
                                      Area =      708 sq.mi.
                        08090202 -- Lake Pontchartrain. Louisiana.
                                      Area =      648 sq.mi.
                        08090203 -- Eastern Louisiana Coastal.
                                    Louisiana.
                                      Area =     2160 sq.mi.

    Accounting Unit 080903 -- Central Louisiana Coastal: The coastal
                              drainage, including islands and
                              associated waters, from the West-Bank
                              Levee of the Mississippi River to the
                              East-Bank Levee of the Atchafalaya Basin
                              Floodway; excluding the Lower Grand River
                              Basin. Louisiana.
                                Area =     5350 sq.mi.

      Cataloging Units  08090301 -- East Central Louisiana Coastal.
                                    Louisiana.
                                      Area =     2460 sq.mi.
                        08090302 -- West Central Louisiana Coastal.
                                    Louisiana.
                                      Area =     2890 sq.mi.


Region 09  Souris-Red-Rainy Region -- The drainage within the United
           states of the Lake of the Woods and the Rainy, Red, and
           Souris River Basins that ultimately discharges into Lake
           Winnipeg and Hudson Bay. Includes parts of Minnesota,
           North Dakota, and South Dakota.


  Subregion  0901 -- Souris: The Souris River Basin within the United
                     States. North Dakota.
                       Area =     9150 sq.mi.

    Accounting Unit 090100 -- Souris. North Dakota.
                                Area =     9150 sq.mi.

      Cataloging Units  09010001 -- Upper Souris. North Dakota.
                                      Area =     2340 sq.mi.
                        09010002 -- Des Lacs. North Dakota.
                                      Area =     1030 sq.mi.
                        09010003 -- Lower Souris. North Dakota.
                                      Area =     2260 sq.mi.
                        09010004 -- Willow. North Dakota.
                                      Area =     1850 sq.mi.
                        09010005 -- Deep. North Dakota.
                                      Area =     1670 sq.mi.


  Subregion  0902 -- Red: The Red River Basin within the United States
                     including the Devils Lake closed basin.
                     Minnesota, North Dakota, South Dakota.
                       Area =    39800 sq.mi.

    Accounting Unit 090201 -- Upper Red: The Red River Basin above the
                              confluence of and including the Goose and
                              Marsh River Basins, excluding the Sheyenne
                              River Basin and the Devils Lake closed
                              basin. Minnesota, North Dakota,
                              South Dakota.
                                Area =    12200 sq.mi.

      Cataloging Units  09020101 -- Bois De Sioux. Minnesota,
                                    North Dakota, South Dakota.
                                      Area =     1140 sq.mi.
                        09020102 -- Mustinka. Minnesota.
                                      Area =      825 sq.mi.
                        09020103 -- Otter Tail. Minnesota.
                                      Area =     1980 sq.mi.
                        09020104 -- Upper Red. Minnesota,
                                    North Dakota.
                                      Area =      594 sq.mi.
                        09020105 -- Western Wild Rice. North Dakota,
                                    South Dakota.
                                      Area =     2380 sq.mi.
                        09020106 -- Buffalo. Minnesota.
                                      Area =     1150 sq.mi.
                        09020107 -- Elm-Marsh. Minnesota, North Dakota.
                                      Area =     1150 sq.mi.
                        09020108 -- Eastern Wild Rice. Minnesota.
                                      Area =     1670 sq.mi.
                        09020109 -- Goose. North Dakota.
                                      Area =     1280 sq.mi.

    Accounting Unit 090202 -- Devils Lake-Sheyenne: The Sheyenne River
                              Basin and the Devils Lake closed basin
                              drainage. North Dakota.
                                Area =    11000 sq.mi.

      Cataloging Units  09020201 -- Devils Lake. North Dakota.
                                      Area =     3700 sq.mi.
                        09020202 -- Upper Sheyenne. North Dakota.
                                      Area =     1940 sq.mi.
                        09020203 -- Middle Sheyenne. North Dakota.
                                      Area =     2070 sq.mi.
                        09020204 -- Lower Sheyenne. North Dakota.
                                      Area =     1640 sq.mi.
                        09020205 -- Maple. North Dakota.
                                      Area =     1620 sq.mi.

    Accounting Unit 090203 -- Lower Red: The Red River Basin within the
                              United States below the confluence of the
                              Goose and Marsh River Basins. Minnesota,
                              North Dakota.
                                Area =    16600 sq.mi.

      Cataloging Units  09020301 -- Sandhill-Wilson. Minnesota,
                                    North Dakota.
                                      Area =     1130 sq.mi.
                        09020302 -- Red Lakes. Minnesota.
                                      Area =     2040 sq.mi.
                        09020303 -- Red Lake. Minnesota.
                                      Area =     1450 sq.mi.
                        09020304 -- Thief. Minnesota.
                                      Area =      994 sq.mi.
                        09020305 -- Clearwater. Minnesota.
                                      Area =     1350 sq.mi.
                        09020306 -- Grand Marais-Red. Minnesota,
                                    North Dakota.
                                      Area =      482 sq.mi.
                        09020307 -- Turtle. North Dakota.
                                      Area =      714 sq.mi.
                        09020308 -- Forest. North Dakota.
                                      Area =      875 sq.mi.
                        09020309 -- Snake. Minnesota.
                                      Area =      953 sq.mi.
                        09020310 -- Park. North Dakota.
                                      Area =     1080 sq.mi.
                        09020311 -- Lower Red. Minnesota, North Dakota.
                                      Area =     1320 sq.mi.
                        09020312 -- Two Rivers. Minnesota.
                                      Area =      958 sq.mi.
                        09020313 -- Pembina. North Dakota.
                                      Area =     2020 sq.mi.
                        09020314 -- Roseau. Minnesota.
                                      Area =     1230 sq.mi.


  Subregion  0903 -- Rainy: The Rainy River Basin and Lake of the Woods
                     drainage within the United States. Minnesota.
                       Area =    11400 sq.mi.

    Accounting Unit 090300 -- Rainy. Minnesota.
                                Area =    11400 sq.mi.

      Cataloging Units  09030001 -- Rainy Headwaters. Minnesota.
                                      Area =     2540 sq.mi.
                        09030002 -- Vermilion. Minnesota.
                                      Area =     1080 sq.mi.
                        09030003 -- Rainy Lake. Minnesota.
                                      Area =      908 sq.mi.
                        09030004 -- Upper Rainy. Minnesota.
                                      Area =      529 sq.mi.
                        09030005 -- Little Fork. Minnesota.
                                      Area =     1880 sq.mi.
                        09030006 -- Big Fork. Minnesota.
                                      Area =     2070 sq.mi.
                        09030007 -- Rapid. Minnesota.
                                      Area =      867 sq.mi.
                        09030008 -- Lower Rainy. Minnesota.
                                      Area =      292 sq.mi.
                        09030009 -- Lake of the Woods. Minnesota.
                                      Area =     1220 sq.mi.


Region 10  Missouri Region -- The drainage within the United states of:
           (a) the Missouri River Basin, (b) the Saskatchewan River
           Basin, and (c) several small closed basins.
           Includes all of Nebraska and parts of Colorado, Iowa, Kansas,
           Minnesota, Missouri, Montana, North Dakota, South Dakota,
           and Wyoming.


  Subregion  1001 -- Saskatchewan: The Saskatchewan River Basin within
                     the United States. Montana.
                       Area =      697 sq.mi.

    Accounting Unit 100100 -- Saskatchewan. Montana.
                                Area =      697 sq.mi.

      Cataloging Units  10010001 -- Belly. Montana.
                                      Area =      192 sq.mi.
                        10010002 -- St. Mary. Montana.
                                      Area =      505 sq.mi.


  Subregion  1002 -- Missouri Headwaters: The Headwaters of the Missouri
                     River Basin above the confluence of and including
                     the Gallatin, Jefferson, and Madison River Basins.
                     Montana, Wyoming.
                       Area =    14100 sq.mi.

    Accounting Unit 100200 -- Missouri Headwaters. Montana,
                              Wyoming.
                                Area =    14100 sq.mi.

      Cataloging Units  10020001 -- Red Rock. Montana.
                                      Area =     2330 sq.mi.
                        10020002 -- Beaverhead. Montana.
                                      Area =     1460 sq.mi.
                        10020003 -- Ruby. Montana.
                                      Area =      988 sq.mi.
                        10020004 -- Big Hole. Montana.
                                      Area =     2790 sq.mi.
                        10020005 -- Jefferson. Montana.
                                      Area =     1340 sq.mi.
                        10020006 -- Boulder. Montana.
                                      Area =      754 sq.mi.
                        10020007 -- Madison. Montana, Wyoming.
                                      Area =     2570 sq.mi.
                        10020008 -- Gallatin. Montana, Wyoming.
                                      Area =     1820 sq.mi.


  Subregion  1003 -- Missouri-Marias: The Missouri River Basin below the
                     confluence of the Gallatin, Jefferson, and
                     Madison River Basins to and including the Marias
                     River Basin. Montana.
                       Area =    20100 sq.mi.

    Accounting Unit 100301 -- Upper Missouri: The Missouri River Basin
                              below the confluence of the Gallatin,
                              Jefferson, and Madison River Basins to,
                              but excluding the Marias River Basin.
                              Montana.
                                Area =    10900 sq.mi.

      Cataloging Units  10030101 -- Upper Missouri. Montana.
                                      Area =     3370 sq.mi.
                        10030102 -- Upper Missouri-Dearborn. Montana.
                                      Area =     2680 sq.mi.
                        10030103 -- Smith. Montana.
                                      Area =     2020 sq.mi.
                        10030104 -- Sun. Montana.
                                      Area =     2000 sq.mi.
                        10030105 -- Belt. Montana.
                                      Area =      806 sq.mi.

    Accounting Unit 100302 -- Marias: The Marias River Basin.
                              Montana.
                                Area =     9180 sq.mi.

      Cataloging Units  10030201 -- Two Medicine. Montana.
                                      Area =     1320 sq.mi.
                        10030202 -- Cut Bank. Montana.
                                      Area =     1230 sq.mi.
                        10030203 -- Marias. Montana.
                                      Area =     3680 sq.mi.
                        10030204 -- Willow. Montana.
                                      Area =      985 sq.mi.
                        10030205 -- Teton. Montana.
                                      Area =     1960 sq.mi.


  Subregion  1004 -- Missouri-Musselshell: The Missouri River Basin
                     below the confluence of the Marias River Basin to
                     Fort Peck Dam. Montana.
                       Area =    23700 sq.mi.

    Accounting Unit 100401 -- Fort Peck Lake. The Missouri River Basin
                              below the confluence of the Marias River
                              Basin to Fort Peck Dam, excluding the
                              Musselshell River Basin. Montana.
                                Area =    14100 sq.mi.

      Cataloging Units  10040101 -- Bullwhacker-Dog. Montana.
                                      Area =     1930 sq.mi.
                        10040102 -- Arrow. Montana.
                                      Area =     1220 sq.mi.
                        10040103 -- Judith. Montana.
                                      Area =     2780 sq.mi.
                        10040104 -- Fort Peck Reservoir. Montana.
                                      Area =     5350 sq.mi.
                        10040105 -- Big Dry. Montana.
                                      Area =     1550 sq.mi.
                        10040106 -- Little Dry. Montana.
                                      Area =     1250 sq.mi.

    Accounting Unit 100402 -- Musselshell: The Musselshell River Basin.
                              Montana.
                                Area =     9570 sq.mi.

      Cataloging Units  10040201 -- Upper Musselshell. Montana.
                                      Area =     4050 sq.mi.
                        10040202 -- Middle Musselshell. Montana.
                                      Area =     1920 sq.mi.
                        10040203 -- Flatwillow. Montana.
                                      Area =      692 sq.mi.
                        10040204 -- Box Elder. Montana.
                                      Area =     1190 sq.mi.
                        10040205 -- Lower Musselshell. Montana.
                                      Area =     1720 sq.mi.


  Subregion  1005 -- Milk: The Milk River Basin within the United
                     States, including the Wild Horse Lake closed basin.
                     Montana.
                       Area =    15300 sq.mi.

    Accounting Unit 100500 -- Milk. Montana.
                                Area =    15300 sq.mi.

      Cataloging Units  10050001 -- Milk Headwaters. Montana.
                                      Area =      520 sq.mi.
                        10050002 -- Upper Milk. Montana.
                                      Area =     1040 sq.mi.
                        10050003 -- Wild Horse Lake. Montana.
                                      Area =       91 sq.mi.
                        10050004 -- Middle Milk. Montana.
                                      Area =     3390 sq.mi.
                        10050005 -- Big Sandy. Montana.
                                      Area =      851 sq.mi.
                        10050006 -- Sage. Montana.
                                      Area =     1050 sq.mi.
                        10050007 -- Lodge. Montana.
                                      Area =      244 sq.mi.
                        10050008 -- Battle. Montana.
                                      Area =      485 sq.mi.
                        10050009 -- Peoples. Montana.
                                      Area =      735 sq.mi.
                        10050010 -- Cottonwood. Montana.
                                      Area =      926 sq.mi.
                        10050011 -- Whitewater. Montana.
                                      Area =      536 sq.mi.
                        10050012 -- Lower Milk. Montana.
                                      Area =     1740 sq.mi.
                        10050013 -- Frenchman. Montana.
                                      Area =      286 sq.mi.
                        10050014 -- Beaver. Montana.
                                      Area =     1750 sq.mi.
                        10050015 -- Rock. Montana.
                                      Area =      878 sq.mi.
                        10050016 -- Porcupine. Montana.
                                      Area =      750 sq.mi.


  Subregion  1006 -- Missouri-Poplar: The Missouri River Basin within
                     the United States from Fort Peck Dam to the
                     confluence with the Yellowstone River Basin.
                     Montana.
                       Area =   10800 sq.mi.

    Accounting Unit 100600 -- Missouri-Poplar. Montana.
                                Area =   10800 sq.mi.

      Cataloging Units  10060001 -- Prarie Elk-Wolf. Montana.
                                      Area =     2040 sq.mi.
                        10060002 -- Redwater. Montana.
                                      Area =     2140 sq.mi.
                        10060003 -- Poplar. Montana.
                                      Area =     1310 sq.mi.
                        10060004 -- West Fork Poplar. Montana.
                                      Area =      863 sq.mi.
                        10060005 -- Charlie-Little Muddy. Montana,
                                    North Dakota.
                                      Area =     1200 sq.mi.
                        10060006 -- Big Muddy. Montana, North Dakota.
                                      Area =     2590 sq.mi.
                        10060007 -- Brush Lake closed basin. Montana,
                                    North Dakota.
                                      Area =      680 sq.mi.


  Subregion  1007 -- Upper Yellowstone: The Yellowstone River Basin
                     above the confluence with the Bighorn River Basin.
                     Montana, Wyoming.
                       Area =    14400 sq.mi.

    Accounting Unit 100700 -- Upper Yellowstone. Montana, Wyoming.
                                Area =    14400 sq.mi.

      Cataloging Units  10070001 -- Yellowstone Headwaters. Montana,
                                    Wyoming.
                                      Area =     2600 sq.mi.
                        10070002 -- Upper Yellowstone. Montana,
                                    Wyoming.
                                      Area =     2940 sq.mi.
                        10070003 -- Shields. Montana.
                                      Area =      853 sq.mi.
                        10070004 -- Upper Yellowstone-Lake Basin.
                                    Montana.
                                      Area =     1580 sq.mi.
                        10070005 -- Stillwater. Montana.
                                      Area =     1060 sq.mi.
                        10070006 -- Clarks Fork Yellowstone. Montana,
                                    Wyoming.
                                      Area =     2770 sq.mi.
                        10070007 -- Upper Yellowstone-Pompeys Pillar.
                                    Montana.
                                      Area =     2000 sq.mi.
                        10070008 -- Pryor. Montana.
                                      Area =      608 sq.mi.


  Subregion  1008 -- Big Horn: The Big Horn River Basin. Montana,
                     Wyoming.
                       Area =    22800 sq.mi.

    Accounting Unit 100800 -- Big Horn. Montana, Wyoming.
                                Area =    22800 sq.mi.

      Cataloging Units  10080001 -- Upper Wind. Wyoming.
                                      Area =     2540 sq.mi.
                        10080002 -- Little Wind. Wyoming.
                                      Area =     1090 sq.mi.
                        10080003 -- Popo Agie. Wyoming.
                                      Area =      798 sq.mi.
                        10080004 -- Muskrat. Wyoming.
                                      Area =      735 sq.mi.
                        10080005 -- Lower Wind. Wyoming.
                                      Area =     1710 sq.mi.
                        10080006 -- Badwater. Wyoming.
                                      Area =      844 sq.mi.
                        10080007 -- Upper Bighorn. Wyoming.
                                      Area =     3450 sq.mi.
                        10080008 -- Nowood. Wyoming.
                                      Area =     1990 sq.mi.
                        10080009 -- Greybull. Wyoming.
                                      Area =     1150 sq.mi.
                        10080010 -- Big Horn Lake. Montana, Wyoming.
                                      Area =     1800 sq.mi.
                        10080011 -- Dry. Wyoming.
                                      Area =      438 sq.mi.
                        10080012 -- North Fork Shoshone. Wyoming.
                                      Area =      853 sq.mi.
                        10080013 -- South Fork Shoshone. Wyoming.
                                      Area =      659 sq.mi.
                        10080014 -- Shoshone. Montana, Wyoming.
                                      Area =     1490 sq.mi.
                        10080015 -- Lower Bighorn. Montana.
                                      Area =     1970 sq.mi.
                        10080016 -- Little Bighorn. Montana, Wyoming.
                                      Area =     1290 sq.mi.


  Subregion  1009 -- Powder-Tongue: The Powder and Tongue River
                     Basins. Montana, Wyoming.
                       Area =    18800 sq.mi.

    Accounting Unit 100901 -- Tongue: The Tongue River Basin.
                              Montana, Wyoming.
                                Area =     5390 sq.mi.

      Cataloging Units  10090101 -- Upper Tongue. Montana, Wyoming.
                                      Area =     2530 sq.mi.
                        10090102 -- Lower Tongue. Montana.
                                      Area =     2860 sq.mi.

    Accounting Unit 100902 -- Powder: The Powder River Basin.
                              Montana, Wyoming.
                                Area =    13400 sq.mi.

      Cataloging Units  10090201 -- Middle Fork Powder. Wyoming.
                                      Area =     1020 sq.mi.
                        10090202 -- Upper Powder. Wyoming.
                                      Area =     2500 sq.mi.
                        10090203 -- South Fork Powder. Wyoming.
                                      Area =     1210 sq.mi.
                        10090204 -- Salt. Wyoming.
                                      Area =      800 sq.mi.
                        10090205 -- Crazy Woman. Wyoming.
                                      Area =      921 sq.mi.
                        10090206 -- Clear. Wyoming.
                                      Area =     1150 sq.mi.
                        10090207 -- Middle Powder. Montana, Wyoming.
                                      Area =     1060 sq.mi.
                        10090208 -- Little Powder. Montana, Wyoming.
                                      Area =     2030 sq.mi.
                        10090209 -- Lower Powder. Montana.
                                      Area =     1890 sq.mi.
                        10090210 -- Mizpah. Montana.
                                      Area =      802 sq.mi.


  Subregion  1010 -- Lower Yellowstone: The Yellowstone River Basin
                     below the confluence with the Big Horn River Basin,
                     excluding the Tongue and Powder River Basins.
                     Montana, North Dakota.
                       Area =    14000 sq.mi.

    Accounting Unit 101000 -- Lower Yellowstone. Montana, North Dakota.
                                Area =    14000 sq.mi.

      Cataloging Units  10100001 -- Lower Yellowstone-Sunday. Montana.
                                      Area =     4800 sq.mi.
                        10100002 -- Big Porcupine. Montana.
                                      Area =      879 sq.mi.
                        10100003 -- Rosebud. Montana.
                                      Area =     1310 sq.mi.
                        10100004 -- Lower Yellowstone. Montana,
                                    North Dakota.
                                      Area =     5430 sq.mi.
                        10100005 -- O'fallon. Montana.
                                      Area =     1590 sq.mi.


  Subregion  1011 -- Missouri-Little Missouri: The Missouri River Basin
                     below the confluence with the Yellowstone River
                     Basin to Garrison Dam. Montana, North Dakota,
                     South Dakota, Wyoming.
                       Area =    17300 sq.mi.

    Accounting Unit 101101 -- Lake Sakakawea: The Missouri River Basin
                              below the confluence with the Yellowstone
                              River Basin to Garrison Dam, excluding
                              the Little Missouri River Basin.
                              North Dakota.
                                Area =     7740 sq.mi.

      Cataloging Units  10110101 -- Lake Sakakawea. North Dakota.
                                      Area =     6790 sq.mi.
                        10110102 -- Little Muddy. North Dakota.
                                      Area =      953 sq.mi.

    Accounting Unit 101102 -- Little Missouri: The Little Missouri River
                              Basin. Montana, North Dakota,
                              South Dakota, Wyoming.
                                Area =     9550 sq.mi.

      Cataloging Units  10110201 -- Upper Little Missouri. Montana,
                                    North Dakota, South Dakota, Wyoming.
                                      Area =     3490 sq.mi.
                        10110202 -- Boxelder. Montana, North Dakota,
                                    South Dakota.
                                      Area =     1210 sq.mi.
                        10110203 -- Middle Little Missouri. Montana,
                                    North Dakota.
                                      Area =     2180 sq.mi.
                        10110204 -- Beaver. Montana, North Dakota.
                                      Area =      871 sq.mi.
                        10110205 -- Lower Little Missouri.
                                    North Dakota.
                                      Area =     1800 sq.mi.


  Subregion  1012 -- Cheyenne: The Cheyenne River Basin above the
                     normal operating pool of Lake Oahe. Montana,
                     Nebraska, South Dakota, Wyoming.
                       Area =    24300 sq.mi.

    Accounting Unit 101201 -- Cheyenne: The Cheyenne River Basin above
                              the normal operating pool of Lake Oahe,
                              excluding the Belle Fourche River Basin.
                              Nebraska, South Dakota, Wyoming.
                                Area =    17000 sq.mi.

      Cataloging Units  10120101 -- Antelope. Wyoming.
                                      Area =     1030 sq.mi.
                        10120102 -- Dry Fork Cheyenne. Wyoming.
                                      Area =      484 sq.mi.
                        10120103 -- Upper Cheyenne. Wyoming.
                                      Area =     1430 sq.mi.
                        10120104 -- Lance. Wyoming.
                                      Area =     1090 sq.mi.
                        10120105 -- Lightning. Wyoming.
                                      Area =     1010 sq.mi.
                        10120106 -- Angostura Reservoir. Nebraska,
                                    South Dakota, Wyoming.
                                      Area =     1410 sq.mi.
                        10120107 -- Beaver. South Dakota, Wyoming.
                                      Area =     1700 sq.mi.
                        10120108 -- Hat. Nebraska, South Dakota,
                                    Wyoming.
                                      Area =      971 sq.mi.
                        10120109 -- Middle Cheyenne-Spring.
                                    South Dakota.
                                      Area =     2110 sq.mi.
                        10120110 -- Rapid. South Dakota.
                                      Area =      725 sq.mi.
                        10120111 -- Middle Cheyenne-Elk. South Dakota.
                                      Area =     1560 sq.mi.
                        10120112 -- Lower Cheyenne. South Dakota.
                                      Area =     1630 sq.mi.
                        10120113 -- Cherry. South Dakota.
                                      Area =     1870 sq.mi.

    Accounting Unit 101202 -- Belle Fourche: The Belle Fourche River
                              Basin. Montana, South Dakota, Wyoming.
                                Area =     7290 sq.mi.

      Cataloging Units  10120201 -- Upper Belle Fourche. South Dakota,
                                    Wyoming.
                                      Area =     2920 sq.mi.
                        10120202 -- Lower Belle Fourche. Montana,
                                    South Dakota, Wyoming.
                                      Area =     3290 sq.mi.
                        10120203 -- Redwater. South Dakota, Wyoming.
                                      Area =     1080 sq.mi.


  Subregion  1013 -- Missouri-Oahe: The Missouri River Basin from
                     Garrison Dam to Oahe Dam, excluding the Cheyenne
                     River Basin above the normal operating pool of Lake
                     Oahe. North Dakota, South Dakota.
                       Area =    37400 sq.mi.

    Accounting Unit 101301 -- Lake Oahe: The Missouri River Basin from
                              Garrison Dam to Oahe Dam, excluding the
                              Cheyenne River Basin above the normal
                              operating pool of Lake Oahe and the
                              Cannonball, Grand, Heart, Knife, and
                              Moreau River Basins. North Dakota,
                              South Dakota.
                                Area =    16700 sq.mi.

      Cataloging Units  10130101 -- Painted Woods-Square Butte.
                                    North Dakota.
                                      Area =     2410 sq.mi.
                        10130102 -- Upper Lake Oahe. North Dakota,
                                    South Dakota.
                                      Area =     3860 sq.mi.
                        10130103 -- Apple. North Dakota.
                                      Area =     3670 sq.mi.
                        10130104 -- Beaver. North Dakota.
                                      Area =     1050 sq.mi.
                        10130105 -- Lower Lake Oahe. South Dakota.
                                      Area =     3570 sq.mi.
                        10130106 -- West Missouri Coteau. North Dakota,
                                    South Dakota.
                                      Area =     2100 sq.mi.

    Accounting Unit 101302 -- Cannonball-Heart-Knife: The Cannonball,
                              Heart, and Knife River Basins.
                              North Dakota, South Dakota.
                                Area =    10300 sq.mi.

      Cataloging Units  10130201 -- Knife. North Dakota.
                                      Area =     2530 sq.mi.
                        10130202 -- Upper Heart. North Dakota.
                                      Area =     1730 sq.mi.
                        10130203 -- Lower Heart. North Dakota.
                                      Area =     1640 sq.mi.
                        10130204 -- Upper Cannonball. North Dakota.
                                      Area =     1640 sq.mi.
                        10130205 -- Cedar. North Dakota, South Dakota.
                                      Area =     1840 sq.mi.
                        10130206 -- Lower Cannonball. North Dakota.
                                      Area =      899 sq.mi.

    Accounting Unit 101303 -- Grand-Moreau: The Grand and Moreau River
                              Basins above the normal operating pool
                              of Lake Oahe. North Dakota, South Dakota.
                                Area =    10400 sq.mi.

      Cataloging Units  10130301 -- North Fork Grand. North Dakota,
                                    South Dakota.
                                      Area =     1280 sq.mi.
                        10130302 -- South Fork Grand. South Dakota.
                                      Area =     1820 sq.mi.
                        10130303 -- Grand. North Dakota, South Dakota.
                                      Area =     2430 sq.mi.
                        10130304 -- South Fork Moreau. South Dakota.
                                      Area =     1010 sq.mi.
                        10130305 -- Upper Moreau. South Dakota.
                                      Area =     1550 sq.mi.
                        10130306 -- Lower Moreau. South Dakota.
                                      Area =     2340 sq.mi.


  Subregion  1014 -- Missouri-White: The Missouri River Basin from
                     Oahe Dam to Fort Randall Dam. Nebraska,
                     South Dakota.
                       Area =    20200 sq.mi.

    Accounting Unit 101401 -- Fort Randall Reservoir: The Missouri
                              River Basin from Oahe Dam to Fort Randall
                              Dam, excluding the White River Basin
                              above the normal operating pool of the
                              Fort Randall Reservoir. South Dakota.
                                Area =    10400 sq.mi.

      Cataloging Units  10140101 -- Fort Randall Reservoir.
                                    South Dakota.
                                      Area =     4390 sq.mi.


                        10140102 -- Bad. South Dakota.
                                      Area =     3170 sq.mi.
                        10140103 -- Medicine Knoll. South Dakota.
                                      Area =      941 sq.mi.
                        10140104 -- Medicine. South Dakota.
                                      Area =      687 sq.mi.
                        10140105 -- Crow. South Dakota.
                                      Area =     1170 sq.mi.

    Accounting Unit 101402 -- White: The White River Basin above the
                              normal operating pool of the Fort Randall
                              Reservoir. Nebraska, South Dakota.
                                Area =     9870 sq.mi.

      Cataloging Units  10140201 -- Upper White. Nebraska, South Dakota.
                                      Area =     3810 sq.mi.
                        10140202 -- Middle White. South Dakota.
                                      Area =     2400 sq.mi.
                        10140203 -- Little White. Nebraska,
                                    South Dakota.
                                      Area =     1580 sq.mi.
                        10140204 -- Lower White. South Dakota.
                                      Area =     2080 sq.mi.


  Subregion  1015 -- Niobrara: The Niobrara River Basin and the Ponca
                     Creek Basin. Nebraska, South Dakota, Wyoming.
                       Area =    13900 sq.mi.

    Accounting Unit 101500 -- Niobrara. Nebraska, South Dakota, Wyoming.
                                Area =    13900 sq.mi.

      Cataloging Units  10150001 -- Ponca. Nebraska, South Dakota.
                                      Area =      776 sq.mi.
                        10150002 -- Niobrara Headwaters. Nebraska,
                                    Wyoming.
                                      Area =     1460 sq.mi.
                        10150003 -- Upper Niobrara. Nebraska,
                                    South Dakota.
                                      Area =     4180 sq.mi.
                        10150004 -- Middle Niobrara. Nebraska,
                                    South Dakota.
                                      Area =     3480 sq.mi.
                        10150005 -- Snake. Nebraska.
                                      Area =      876 sq.mi.
                        10150006 -- Keya Paha. Nebraska, South Dakota.
                                      Area =     1710 sq.mi.
                        10150007 -- Lower Niobrara. Nebraska.
                                      Area =     1460 sq.mi.

  Subregion  1016 -- James: The James River Basin. North Dakota, South
                     Dakota.
                       Area =    21500 sq.mi.

    Accounting Unit 101600 -- James. North Dakota, South Dakota.
                                Area =    21500 sq.mi.

      Cataloging Units  10160001 -- James Headwaters. North Dakota.
                                      Area =     1780 sq.mi.
                        10160002 -- Pipestem. North Dakota.
                                      Area =     1050 sq.mi.
                        10160003 -- Upper James. North Dakota,
                                    South Dakota.
                                      Area =     4280 sq.mi.
                        10160004 -- Elm. North Dakota, South Dakota.
                                      Area =     1600 sq.mi.
                        10160005 -- Mud. South Dakota.
                                      Area =      648 sq.mi.
                        10160006 -- Middle James. South Dakota.
                                      Area =     3610 sq.mi.
                        10160007 -- East Missouri Coteau.
                                    South Dakota.
                                      Area =      904 sq.mi.
                        10160008 -- Snake. South Dakota.
                                      Area =     1500 sq.mi.
                        10160009 -- Turtle. South Dakota.
                                      Area =     1380 sq.mi.
                        10160010 -- North Big Sioux Coteau.
                                    South Dakota.
                                      Area =     1250 sq.mi.
                        10160011 -- Lower James. South Dakota.
                                      Area =     3480 sq.mi.


  Subregion  1017 -- Missouri-Big Sioux: The Missouri River Basin from
                     Fort Randall Dam to and including the Big Sioux
                     River Basin, but excluding the Ponca Creek,
                     Niobrara River, and James River Basins. Iowa,
                     Minnesota, Nebraska, South Dakota.
                       Area =    13900 sq.mi.

    Accounting Unit 101701 -- Lewis and Clark Lake: The Missouri
                              River Basin from Fort Randall Dam to the
                              Big Sioux River Basin, but excluding the
                              Ponca Creek, Niobrara River, and James
                              River Basins. Nebraska, South Dakota.
                                Area =     5860 sq.mi.

      Cataloging Units  10170101 -- Lewis and Clark Lake. Nebraska,
                                    South Dakota.
                                      Area =     3210 sq.mi.
                        10170102 -- Vermillion. South Dakota.
                                      Area =     2240 sq.mi.
                        10170103 -- South Big Sioux Coteau. South Dakota.
                                      Area =      405 sq.mi.

    Accounting Unit 101702 -- Big Sioux: The Big Sioux River Basin.
                              Iowa, Minnesota, South Dakota.
                                Area =     8030 sq.mi.

      Cataloging Units  10170201 -- Middle Big Sioux Coteau.
                                    South Dakota.
                                      Area =     1210 sq.mi.
                        10170202 -- Upper Big Sioux. Minnesota,
                                    South Dakota.
                                      Area =     1970 sq.mi.
                        10170203 -- Lower Big Sioux. Iowa,
                                    Minnesota, South Dakota.
                                      Area =     3110 sq.mi.
                        10170204 -- Rock. Iowa, Minnesota.
                                      Area =     1740 sq.mi.


  Subregion  1018 -- North Platte: The North Platte River Basin.
                     Colorado, Nebraska, Wyoming.
                       Area =    30900 sq.mi.

    Accounting Unit 101800 -- North Platte. Colorado, Nebraska,
                              Wyoming.
                                Area =    30900 sq.mi.

      Cataloging Units  10180001 -- North Platte Headwaters. Colorado.
                                      Area =     1420 sq.mi.
                        10180002 -- Upper North Platte. Colorado,
                                    Wyoming.
                                      Area =     2880 sq.mi.
                        10180003 -- Pathfinder-Seminoe Reservoirs.
                                    Wyoming.
                                      Area =      980 sq.mi.
                        10180004 -- Medicine Bow. Wyoming.
                                      Area =     1430 sq.mi.
                        10180005 -- Little Medicine Bow. Wyoming.
                                      Area =     1030 sq.mi.
                        10180006 -- Sweetwater. Wyoming.
                                      Area =     2880 sq.mi.
                        10180007 -- Middle North Platte-Casper.
                                    Wyoming.
                                      Area =     3490 sq.mi.
                        10180008 -- Glendo Reservoir. Wyoming.
                                      Area =     2090 sq.mi.
                        10180009 -- Middle North Platte-Scotts Bluff.
                                    Nebraska, Wyoming.
                                      Area =     5190 sq.mi.
                        10180010 -- Upper Laramie. Colorado, Wyoming.
                                      Area =     2180 sq.mi.
                        10180011 -- Lower Laramie. Wyoming.
                                      Area =     2370 sq.mi.
                        10180012 -- Horse. Nebraska, Wyoming.
                                      Area =     1650 sq.mi.
                        10180013 -- Pumpkin. Nebraska, Wyoming.
                                      Area =     1020 sq.mi.
                        10180014 -- Lower North Platte. Nebraska.
                                      Area =     2270 sq.mi.


  Subregion  1019 -- South Platte: The South Platte River Basin.
                     Colorado, Nebraska, Wyoming.
                       Area =    23900 sq.mi.

    Accounting Unit 101900 -- South Platte. Colorado, Nebraska,
                              Wyoming.
                                Area =    23900 sq.mi.

      Cataloging Units  10190001 -- South Platte Headwaters. Colorado.
                                      Area =     1590 sq.mi.
                        10190002 -- Upper South Platte. Colorado.
                                      Area =     1820 sq.mi.
                        10190003 -- Middle South Platte-Cherry Creek.
                                    Colorado.
                                      Area =     2870 sq.mi.
                        10190004 -- Clear. Colorado.
                                      Area =      558 sq.mi.
                        10190005 -- St. Vrain. Colorado.
                                      Area =      978 sq.mi.
                        10190006 -- Big Thompson. Colorado.
                                      Area =      819 sq.mi.
                        10190007 -- Cache La Poudre. Colorado,
                                    Wyoming.
                                      Area =     1910 sq.mi.
                        10190008 -- Lone Tree-Owl. Colorado,
                                    Wyoming.
                                      Area =      573 sq.mi.
                        10190009 -- Crow. Colorado, Wyoming.
                                      Area =     1410 sq.mi.
                        10190010 -- Kiowa. Colorado.
                                      Area =      720 sq.mi.
                        10190011 -- Bijou. Colorado.
                                      Area =     1360 sq.mi.
                        10190012 -- Middle South Platte-Sterling.
                                    Colorado, Nebraska.
                                      Area =     2900 sq.mi.
                        10190013 -- Beaver. Colorado.
                                      Area =     1080 sq.mi.
                        10190014 -- Pawnee. Colorado.
                                      Area =      728 sq.mi.
                        10190015 -- Upper Lodgepole. Colorado,
                                    Nebraska, Wyoming.
                                      Area =     1130 sq.mi.
                        10190016 -- Lower Lodgepole. Colorado,
                                    Nebraska, Wyoming.
                                      Area =     1350 sq.mi.
                        10190017 -- Sidney Draw. Colorado, Nebraska,
                                    Wyoming.
                                      Area =      744 sq.mi.
                        10190018 -- Lower South Platte. Colorado,
                                    Nebraska.
                                      Area =     1380 sq.mi.


  Subregion  1020 -- Platte: The Platte River Basin below the confluence
                     of the North and South Platte River Basins,
                     excluding the Elkhorn and Loup River Basins.
                     Nebraska.
                       Area =     8160 sq.mi.

    Accounting Unit 102001 -- Middle Platte: The Platte River Basin
                              below the confluence of the North and South
                              Platte River Basins to the confluence
                              with the Loup River Basin. Nebraska.
                                Area =     5130 sq.mi.

      Cataloging Units  10200101 -- Middle Platte-Buffalo. Nebraska.
                                      Area =     3270 sq.mi.
                        10200102 -- Wood. Nebraska.
                                      Area =      736 sq.mi.
                        10200103 -- Middle Platte-Prairie. Nebraska.
                                      Area =     1120 sq.mi.

    Accounting Unit 102002 -- Lower Platte: The Platte River Basin
                     below the confluence with the Loup River Basin,
                     excluding the Elkhorn River Basin. Nebraska.
                                Area =     3030 sq.mi.

      Cataloging Units  10200201 -- Lower Platte-Shell. Nebraska.
                                      Area =      879 sq.mi.
                        10200202 -- Lower Platte. Nebraska.
                                      Area =      531 sq.mi.
                        10200203 -- Salt. Nebraska.
                                      Area =     1620 sq.mi.

  Subregion  1021 -- Loup: The Loup River Basin. Nebraska.
                       Area =    15000 sq.mi.

    Accounting Unit 102100 -- Loup. Nebraska.
                                Area =    15000 sq.mi.

      Cataloging Units  10210001 -- Upper Middle Loup. Nebraska.
                                      Area =     1800 sq.mi.
                        10210002 -- Dismal. Nebraska.
                                      Area =     2050 sq.mi.
                        10210003 -- Lower Middle Loup. Nebraska.
                                      Area =     1490 sq.mi.
                        10210004 -- South Loup. Nebraska.
                                      Area =     1700 sq.mi.
                        10210005 -- Mud. Nebraska.
                                      Area =     1000 sq.mi.
                        10210006 -- Upper North Loup. Nebraska.
                                      Area =     2250 sq.mi.
                        10210007 -- Lower North Loup. Nebraska.
                                      Area =      955 sq.mi.
                        10210008 -- Calamus. Nebraska.
                                      Area =     1080 sq.mi.
                        10210009 -- Loup. Nebraska.
                                      Area =     1430 sq.mi.
                        10210010 -- Cedar. Nebraska.
                                      Area =     1240 sq.mi.

  Subregion  1022 -- Elkhorn: The Elkhorn River Basin. Nebraska.
                       Area =     6950 sq.mi.

    Accounting Unit 102200 -- Elkhorn. Nebraska.
                                Area =     6950 sq.mi.

      Cataloging Units  10220001 -- Upper Elkhorn. Nebraska.
                                      Area =     2880 sq.mi.
                        10220002 -- North Fork Elkhorn. Nebraska.
                                      Area =      843 sq.mi.
                        10220003 -- Lower Elkhorn. Nebraska.
                                      Area =     2180 sq.mi.
                        10220004 -- Logan. Nebraska.
                                      Area =     1050 sq.mi.


  Subregion  1023 -- Missouri-Little Sioux: The Missouri River Basin
                     below the confluence with the Big Sioux River Basin
                     to the confluence with the Platte River Basin.
                     Iowa, Minnesota, Nebraska.
                       Area =     9140 sq.mi.

    Accounting Unit 102300 -- Missouri-Little Sioux. Iowa, Minnesota,
                              Nebraska.
                                Area =     9140 sq.mi.

      Cataloging Units  10230001 -- Blackbird-Soldier. Iowa, Nebraska.
                                      Area =     1500 sq.mi.
                        10230002 -- Floyd. Iowa.
                                      Area =      902 sq.mi.
                        10230003 -- Little Sioux. Iowa, Minnesota.
                                      Area =     2800 sq.mi.
                        10230004 -- Monona-Harrison Ditch. Iowa.
                                      Area =      954 sq.mi.
                        10230005 -- Maple. Iowa.
                                      Area =      747 sq.mi.
                        10230006 -- Big Papillion-Mosquito. Iowa,
                                    Nebraska.
                                      Area =     1160 sq.mi.
                        10230007 -- Boyer. Iowa.
                                      Area =     1080 sq.mi.


  Subregion  1024 -- Missouri-Nishnabotna: The Missouri River Basin
                     below the confluence with the Platte River Basin to
                     the confluence with the Kansas River Basin. Iowa,
                     Kansas, Missouri, Nebraska.
                       Area =    13300 sq.mi.

    Accounting Unit 102400 -- Missouri-Nishnabotna. Iowa, Kansas,
                              Missouri, Nebraska.
                                Area =    13300 sq.mi.

      Cataloging Units  10240001 -- Keg-Weeping Water. Iowa, Missouri,
                                    Nebraska.
                                      Area =      783 sq.mi.
                        10240002 -- West Nishnabotna. Iowa.
                                      Area =     1650 sq.mi.
                        10240003 -- East Nishnabotna. Iowa.
                                      Area =     1140 sq.mi.
                        10240004 -- Nishnabotna. Iowa, Missouri.
                                      Area =      173 sq.mi.
                        10240005 -- Tarkio-Wolf. Iowa, Kansas, Missouri,
                                    Nebraska.
                                      Area =     1640 sq.mi.
                        10240006 -- Little Nemaha. Nebraska.
                                      Area =      881 sq.mi.
                        10240007 -- South Fork Big Nemaha. Kansas,
                                    Nebraska.
                                      Area =      705 sq.mi.
                        10240008 -- Big Nemaha. Kansas, Nebraska.
                                      Area =     1190 sq.mi.
                        10240009 -- West Nodaway. Iowa.
                                      Area =      782 sq.mi.
                        10240010 -- Nodaway. Iowa, Missouri.
                                      Area =      968 sq.mi.
                        10240011 -- Independence-Sugar. Kansas,
                                    Missouri.
                                      Area =      915 sq.mi.
                        10240012 -- Platte. Iowa, Missouri.
                                      Area =     1670 sq.mi.
                        10240013 -- One Hundred and Two. Iowa, Missouri.
                                      Area =      773 sq.mi.


  Subregion  1025 -- Republican: The Republican River Basin.
                     Colorado, Kansas, Nebraska.
                       Area =    24700 sq.mi.

    Accounting Unit 102500 -- Republican. Colorado, Kansas,
                              Nebraska.
                                Area =    24700 sq.mi.

      Cataloging Units  10250001 -- Arikaree. Colorado, Kansas,
                                    Nebraska.
                                      Area =     1710 sq.mi.
                        10250002 -- North Fork Republican. Colorado,
                                    Kansas, Nebraska.
                                      Area =     3290 sq.mi.
                        10250003 -- South Fork Republican. Colorado,
                                    Kansas, Nebraska.
                                      Area =     2720 sq.mi.
                        10250004 -- Upper Republican. Colorado,
                                    Kansas, Nebraska.
                                      Area =     2160 sq.mi.
                        10250005 -- Frenchman. Colorado, Nebraska.
                                      Area =     1350 sq.mi.
                        10250006 -- Stinking Water. Colorado, Nebraska.
                                      Area =     1470 sq.mi.
                        10250007 -- Red Willow. Nebraska.
                                      Area =      783 sq.mi.
                        10250008 -- Medicine. Nebraska.
                                      Area =      916 sq.mi.
                        10250009 -- Harlan County Reservoir. Kansas,
                                    Nebraska.
                                      Area =     1350 sq.mi.
                        10250010 -- Upper Sappa. Kansas.
                                      Area =     1020 sq.mi.
                        10250011 -- Lower Sappa. Kansas, Nebraska.
                                      Area =      644 sq.mi.
                        10250012 -- South Fork Beaver. Colorado,
                                    Kansas.
                                      Area =      771 sq.mi.
                        10250013 -- Little Beaver. Colorado, Kansas.
                                      Area =      604 sq.mi.
                        10250014 -- Beaver. Kansas, Nebraska.
                                      Area =      731 sq.mi.
                        10250015 -- Prairie Dog. Kansas, Nebraska.
                                      Area =     1060 sq.mi.
                        10250016 -- Middle Republican. Kansas, Nebraska.
                                      Area =     2130 sq.mi.
                        10250017 -- Lower Republican. Kansas.
                                      Area =     1960 sq.mi.


  Subregion  1026 -- Smoky Hill: The Smoky Hill River Basin. Colorado,
                     Kansas.
                       Area =    19800 sq.mi.

    Accounting Unit 102600 -- Smoky Hill. Colorado, Kansas.
                                Area =    19800 sq.mi.

      Cataloging Units  10260001 -- Smoky Hill Headwaters. Colorado,
                                    Kansas.
                                      Area =     1070 sq.mi.
                        10260002 -- North Fork Smoky Hill. Colorado,
                                    Kansas.
                                      Area =      734 sq.mi.
                        10260003 -- Upper Smoky Hill. Kansas.
                                      Area =     1470 sq.mi.
                        10260004 -- Ladder. Colorado, Kansas.
                                      Area =     1430 sq.mi.
                        10260005 -- Hackberry. Kansas.
                                      Area =      622 sq.mi.
                        10260006 -- Middle Smoky Hill. Kansas.
                                      Area =     1590 sq.mi.
                        10260007 -- Big. Kansas.
                                      Area =      852 sq.mi.
                        10260008 -- Lower Smoky Hill. Kansas.
                                      Area =     1980 sq.mi.
                        10260009 -- Upper Saline. Kansas.
                                      Area =     1910 sq.mi.
                        10260010 -- Lower Saline. Kansas.
                                      Area =     1360 sq.mi.
                        10260011 -- Upper North Fork Solomon. Kansas.
                                      Area =     1350 sq.mi.
                        10260012 -- Lower North Fork Solomon. Kansas.
                                      Area =     1330 sq.mi.
                        10260013 -- Upper South Fork Solomon. Kansas.
                                      Area =     1150 sq.mi.
                        10260014 -- Lower South Fork Solomon. Kansas.
                                      Area =     1040 sq.mi.
                        10260015 -- Solomon. Kansas.
                                      Area =     1880 sq.mi.


  Subregion  1027 -- Kansas: The Kansas River Basin, excluding the
                     Republican and Smoky Hill River Basins. Kansas,
                     Nebraska, Missouri.
                       Area =    15000 sq.mi.

    Accounting Unit 102701 -- Kansas: The Kansas River Basin, excluding
                              the Big Blue, Republican, and Smoky Hill
                              River Basins. Kansas, Missouri.
                                Area =     5500 sq.mi.

      Cataloging Units  10270101 -- Upper Kansas. Kansas.
                                      Area =      548 sq.mi.
                        10270102 -- Middle Kansas. Kansas.
                                      Area =     2160 sq.mi.
                        10270103 -- Delaware. Kansas.
                                      Area =     1150 sq.mi.
                        10270104 -- Lower Kansas. Kansas, Missouri.
                                      Area =     1640 sq.mi.

    Accounting Unit 102702 -- Big Blue: The Big Blue River Basin.
                              Kansas, Nebraska.
                                Area =     9540 sq.mi.

      Cataloging Units  10270201 -- Upper Big Blue. Nebraska.
                                      Area =     1080 sq.mi.
                        10270202 -- Middle Big Blue. Nebraska.
                                      Area =     1260 sq.mi.
                        10270203 -- West Fork Big Blue. Nebraska.
                                      Area =     1330 sq.mi.
                        10270204 -- Turkey. Nebraska.
                                      Area =      725 sq.mi.
                        10270205 -- Lower Big Blue. Kansas, Nebraska.
                                      Area =     1650 sq.mi.
                        10270206 -- Upper Little Blue. Kansas,
                                    Nebraska.
                                      Area =     2160 sq.mi.
                        10270207 -- Lower Little Blue. Kansas,
                                    Nebraska.
                                      Area =     1330 sq.mi.


  Subregion  1028 -- Chariton-Grand: The Chariton, Grand, and Little
                     Chariton River Basins. Iowa, Missouri.
                       Area =    10900 sq.mi.

    Accounting Unit 102801 -- Grand: The Grand River Basin. Iowa,
                              Missouri.
                                Area =     7810 sq.mi.

      Cataloging Units  10280101 -- Upper Grand. Iowa, Missouri.
                                      Area =     3280 sq.mi.
                        10280102 -- Thompson. Iowa, Missouri.
                                      Area =     2200 sq.mi.
                        10280103 -- Lower Grand. Iowa, Missouri.
                                      Area =     2330 sq.mi.

    Accounting Unit 102802 -- Chariton: The Chariton and Little Chariton
                              River Basins. Iowa, Missouri.
                                Area =     3070 sq.mi.

      Cataloging Units  10280201 -- Upper Chariton. Iowa, Missouri.
                                      Area =     1370 sq.mi.
                        10280202 -- Lower Chariton. Missouri.
                                      Area =     1020 sq.mi.
                        10280203 -- Little Chariton. Missouri.
                                      Area =      679 sq.mi.


  Subregion  1029 -- Gasconade-Osage: The Gasconade and Osage River
                     Basins. Kansas, Missouri.
                       Area =    18400 sq.mi.

    Accounting Unit 102901 -- Osage: The Osage River Basin.
                              Kansas, Missouri.
                                Area =    14800 sq.mi.

      Cataloging Units  10290101 -- Upper Marais Des Cygnes. Kansas.
                                      Area =     2150 sq.mi.
                        10290102 -- Lower Marais Des Cygnes. Kansas,
                                    Missouri.
                                      Area =     1560 sq.mi.
                        10290103 -- Little Osage. Kansas, Missouri.
                                      Area =      535 sq.mi.
                        10290104 -- Marmaton. Kansas, Missouri.
                                      Area =     1080 sq.mi.
                        10290105 -- Harry S. Truman Reservoir. Missouri.
                                      Area =     1210 sq.mi.
                        10290106 -- Sac. Missouri.
                                      Area =     1950 sq.mi.
                        10290107 -- Pomme De Terre. Missouri.
                                      Area =      840 sq.mi.
                        10290108 -- South Grand. Kansas, Missouri.
                                      Area =     1990 sq.mi.
                        10290109 -- Lake of the Ozarks. Missouri.
                                      Area =     1370 sq.mi.
                        10290110 -- Niangua. Missouri.
                                      Area =     1040 sq.mi.
                        10290111 -- Lower Osage. Missouri.
                                      Area =     1080 sq.mi.

    Accounting Unit 102902 -- Gasconade. The Gasconade River Basin.
                              Missouri.
                                Area =     3550 sq.mi.

      Cataloging Units  10290201 -- Upper Gasconade. Missouri.
                                      Area =     1780 sq.mi.
                        10290202 -- Big Piney. Missouri.
                                      Area =      754 sq.mi.
                        10290203 -- Lower Gasconade. Missouri.
                                      Area =     1020 sq.mi.


  Subregion  1030 -- Lower Missouri: The Missouri River Basin below the
                     confluence with the Kansas River Basin to the
                     confluence with the Mississippi River, excluding
                     the Chariton, Gasconade, Grand, and Osage River
                     Basins. Kansas, Missouri.
                       Area =    10200 sq.mi.

    Accounting Unit 103001 -- Lower Missouri-Blackwater. The Missouri
                              River Basin below the confluence with the
                              Kansas River Basin to the confluence with
                              the Gasconade River Basin, excluding the
                              Chariton, Gasconade, Grand, and Osage
                              River Basins.   Kansas, Missouri.
                                Area =     8640 sq.mi.

      Cataloging Units  10300101 -- Lower Missouri-Crooked. Kansas,
                                    Missouri.
                                      Area =     2650 sq.mi.
                        10300102 -- Lower Missouri-Moreau. Missouri.
                                      Area =     3360 sq.mi.
                        10300103 -- Lamine. Missouri.
                                      Area =     1120 sq.mi.
                        10300104 -- Blackwater. Missouri.
                                      Area =     1510 sq.mi.

    Accounting Unit 103002 -- Lower Missouri. The Missouri River
                              Basin below the confluence with the
                              Gasconade River Basin to the confluence
                              with the Mississippi River. Missouri.
                                Area =     1590 sq.mi.

      Cataloging Unit   10300200 -- Lower Missouri. Missouri.
                                      Area =     1590 sq.mi.


Region 11  Arkansas-White-Red Region -- The drainage of the Arkansas,
           White, and Red River Basins above the points of highest
           backwater effect of the Mississippi River. Includes all of
           Oklahoma and parts of Arkansas, Colorado, Kansas, Louisiana,
           Missouri, New Mexico, and Texas.


  Subregion  1101 -- Upper White: The White River Basin above and
                     including the Little Red River Basin to the point
                     of highest backwater effect of the Mississippi
                     River. Arkansas, Missouri.
                       Area =    22200 sq.mi.

    Accounting Unit 110100 -- Upper White. Arkansas, Missouri.
                                Area =    22200 sq.mi.

      Cataloging Units  11010001 -- Beaver Reservoir. Arkansas, Missouri.
                                      Area =     2540 sq.mi.
                        11010002 -- James. Missouri.
                                      Area =     1420 sq.mi.
                        11010003 -- Bull Shoals Lake. Arkansas,
                                    Missouri.
                                      Area =     2600 sq.mi.
                        11010004 -- Middle White. Arkansas.
                                      Area =     1490 sq.mi.
                        11010005 -- Buffalo. Arkansas.
                                      Area =     1330 sq.mi.
                        11010006 -- North Fork White. Arkansas,
                                    Missouri.
                                      Area =     1810 sq.mi.
                        11010007 -- Upper Black. Arkansas,
                                    Missouri.
                                      Area =     1900 sq.mi.
                        11010008 -- Current. Arkansas, Missouri.
                                      Area =     2600 sq.mi.
                        11010009 -- Lower Black. Arkansas, Missouri.
                                      Area =      760 sq.mi.
                        11010010 -- Spring. Arkansas, Missouri.
                                      Area =     1210 sq.mi.
                        11010011 -- Eleven Point. Arkansas, Missouri.
                                      Area =     1210 sq.mi.
                        11010012 -- Strawberry. Arkansas.
                                      Area =      761 sq.mi.
                        11010013 -- Upper White-Village. Arkansas.
                                      Area =      758 sq.mi.
                        11010014 -- Little Red. Arkansas.
                                      Area =     1790 sq.mi.


  Subregion  1102 -- Upper Arkansas: The Arkansas River Basin above Its
                     intersect with the Colorado-Kansas state Line.
                     Colorado, Kansas, New Mexico.
                       Area =    24600 sq.mi.

    Accounting Unit 110200 -- Upper Arkansas. Colorado, Kansas,
                              New Mexico.
                                Area =    24600 sq.mi.

      Cataloging Units  11020001 -- Arkansas Headwaters. Colorado.
                                      Area =     3020 sq.mi.
                        11020002 -- Upper Arkansas. Colorado.
                                      Area =     2280 sq.mi.
                        11020003 -- Fountain. Colorado.
                                      Area =      917 sq.mi.
                        11020004 -- Chico. Colorado.
                                      Area =      729 sq.mi.
                        11020005 -- Upper Arkansas-Lake Meredith.
                                    Colorado.
                                      Area =     2170 sq.mi.
                        11020006 -- Huerfano. Colorado.
                                      Area =     1830 sq.mi.
                        11020007 -- Apishapa. Colorado.
                                      Area =     1060 sq.mi.
                        11020008 -- Horse. Colorado.
                                      Area =     1400 sq.mi.
                        11020009 -- Upper Arkansas-John Martin
                                    Reservoir. Colorado, Kansas.
                                      Area =     3770 sq.mi.
                        11020010 -- Purgatoire. Colorado, New Mexico.
                                      Area =     3440 sq.mi.
                        11020011 -- Big Sandy. Colorado.
                                      Area =     1880 sq.mi.
                        11020012 -- Rush. Colorado.
                                      Area =     1350 sq.mi.
                        11020013 -- Two Butte. Colorado.
                                      Area =      798 sq.mi.


  Subregion  1103 -- Middel Arkansas: The Arkansas River Basin below
                     its intersect with the Colorado-Kansas state line
                     to and including the Walnut River Basin,
                     including the Whitewoman Creek closed basin.
                     Colorado, Kansas.
                        Area =   20200 sq.mi.

    Accounting Unit 110300 -- Middle Arkansas. Colorado, Kansas.
                                Area =    20200 sq.mi.

      Cataloging Units  11030001 -- Middle Arkansas-Lake Mckinney.
                                    Colorado, Kansas.
                                      Area =     2330 sq.mi.
                        11030002 -- Whitewoman. Colorado, Kansas.
                                      Area =     1370 sq.mi.
                        11030003 -- Arkansas-Dodge City. Kansas.
                                      Area =      970 sq.mi.
                        11030004 -- Coon-Pickerel. Kansas.
                                      Area =     1600 sq.mi.
                        11030005 -- Pawnee. Kansas.
                                      Area =     1810 sq.mi.
                        11030006 -- Buckner. Kansas.
                                      Area =      902 sq.mi.
                        11030007 -- Upper Walnut Creek. Kansas.
                                      Area =      885 sq.mi.
                        11030008 -- Lower Walnut Creek. Kansas.
                                      Area =      935 sq.mi.
                        11030009 -- Rattlesnake. Kansas.
                                      Area =     1280 sq.mi.
                        11030010 -- Gar-Peace. Kansas.
                                      Area =      559 sq.mi.
                        11030011 -- Cow. Kansas.
                                      Area =      938 sq.mi.
                        11030012 -- Little Arkansas. Kansas.
                                      Area =     1320 sq.mi.
                        11030013 -- Middle Arkansas-Slate. Kansas.
                                      Area =     1010 sq.mi.
                        11030014 -- North Fork Ninnescah. Kansas.
                                      Area =      941 sq.mi.
                        11030015 -- South Fork Ninnescah. Kansas.
                                      Area =      964 sq.mi.
                        11030016 -- Ninnescah. Kansas.
                                      Area =      392 sq.mi.
                        11030017 -- Upper Walnut River. Kansas.
                                      Area =      957 sq.mi.
                        11030018 -- Lower Walnut River. Kansas.
                                      Area =     1000 sq.mi.


  Subregion  1104 -- Upper Cimarron: The Cimarron River Basin from its
                     headwaters to the river's most downstream intersect
                     with the Kansas-Oklahoma state line, including the
                     Bear Creek closed basin. Colorado, Kansas,
                     New Mexico, Oklahoma.
                       Area =    12000 sq.mi.

    Accounting Unit 110400 -- Upper Cimarron. Colorado, Kansas,
                              New Mexico, Oklahoma.
                                Area =    12000 sq.mi.

      Cataloging Units  11040001 -- Cimarron headwaters. Colorado,
                                    New Mexico, Oklahoma.
                                      Area =     1730 sq.mi.
                        11040002 -- Upper Cimarron. Colorado, Kansas,
                                    New Mexico, Oklahoma.
                                      Area =     1750 sq.mi.
                        11040003 -- North Fork Cimarron. Colorado,
                                    Kansas.
                                      Area =      987 sq.mi.
                        11040004 -- Sand Arroyo. Colorado, Kansas.
                                      Area =      728 sq.mi.
                        11040005 -- Bear. Colorado, Kansas.
                                      Area =     1870 sq.mi.
                        11040006 -- Upper Cimarron-Liberal. Kansas,
                                    Oklahoma.
                                      Area =     1720 sq.mi.
                        11040007 -- Crooked. Kansas, Oklahoma.
                                      Area =     1430 sq.mi.
                        11040008 -- Upper Cimarron-Bluff. Kansas,
                                    Oklahoma.
                                      Area =     1800 sq.mi.


  Subregion  1105 -- Lower Cimarron: The Cimarron River Basin below the
                     river's most downstream intersect with the
                     Kansas-Oklahoma state line to the confluence with
                     the Arkansas River, including that portion inundated
                     by Keystone Reservoir. Kansas, Oklahoma.
                       Area =     7050 sq.mi.

    Accounting Unit 110500 -- Lower Cimarron. Kansas, Oklahoma.
                                Area =     7050 sq.mi.

      Cataloging Units  11050001 -- Lower Cimarron-Eagle Chief. Kansas,
                                    Okalhoma.
                                      Area =     2490 sq.mi.
                        11050002 -- Lower Cimarron-Skeleton. Oklahoma.
                                      Area =     3180 sq.mi.
                        11050003 -- Lower Cimarron. Oklahoma.
                                      Area =     1380 sq.mi.


  Subregion  1106 -- Arkansas - Keystone: The Arkansas River Basin below
                     the Walnut River Basin to Keystone Dam,
                     excluding the Cimarron River Basin.
                     Kansas, Oklahoma.
                       Area =     9750 sq.mi.

    Accounting Unit 110600 -- Arkansas - Keystone. Kansas, Oklahoma.
                                Area =     9750 sq.mi.

      Cataloging Units  11060001 -- Kaw Lake. Kansas, Oklahoma.
                                      Area =      926 sq.mi.
                        11060002 -- Upper Salt Fork Arkansas. Kansas,
                                    Oklahoma.
                                      Area =     1080 sq.mi.
                        11060003 -- Medicine Lodge. Kansas, Oklahoma.
                                      Area =     1280 sq.mi.
                        11060004 -- Lower Salt Fork Arkansas. Kansas,
                                    Oklahoma.
                                      Area =     2340 sq.mi.
                        11060005 -- Chikaskia. Kansas, Oklahoma.
                                      Area =     2000 sq.mi.
                        11060006 -- Black Bear-Red Rock. Oklahoma.
                                      Area =     2120 sq.mi.


  Subregion  1107 -- Neosho - Verdigris. The Neosho and Verdigris River
                     Basins. Arkansas, Kansas, Missouri, Oklahoma.
                       Area =    20500 sq.mi.

    Accounting Unit 110701 -- Verdigris: The Verdigris River Basin.
                              Kansas, Oklahoma.
                                Area =     8100 sq.mi.

      Cataloging Units  11070101 -- Upper Verdigris. Kansas.
                                      Area =     1160 sq.mi.
                        11070102 -- Fall. Kansas.
                                      Area =      868 sq.mi.
                        11070103 -- Middle Verdigris. Kansas, Oklahoma.
                                      Area =     1500 sq.mi.
                        11070104 -- Elk. Kansas.
                                      Area =      673 sq.mi.
                        11070105 -- Lower Verdigris. Oklahoma.
                                      Area =      692 sq.mi.
                        11070106 -- Caney. Kansas, Oklahoma.
                                      Area =     2080 sq.mi.
                        11070107 -- Bird. Oklahoma.
                                      Area =     1130 sq.mi.

    Accounting Unit 110702 -- Neosho: The Neosho River Basin.
                              Arkansas, Kansas, Missouri, Oklahoma.
                                Area =    12400 sq.mi.

      Cataloging Units  11070201 -- Neosho headwaters. Kansas.
                                      Area =     1110 sq.mi.
                        11070202 -- Upper Cottonwood. Kansas.
                                      Area =      927 sq.mi.
                        11070203 -- Lower Cottonwood. Kansas.
                                      Area =      968 sq.mi.
                        11070204 -- Upper Neosho. Kansas.
                                      Area =     1360 sq.mi.
                        11070205 -- Middle Neosho. Kansas, Oklahoma.
                                      Area =     1420 sq.mi.
                        11070206 -- Lake O' the Cherokees. Arkansas,
                                    Kansas, Missouri, Oklahoma.
                                      Area =      911 sq.mi.
                        11070207 -- Spring. Kansas, Missouri,
                                    Oklahoma.
                                      Area =     2500 sq.mi.
                        11070208 -- Elk. Arkansas, Missouri, Oklahoma.
                                      Area =     1010 sq.mi.
                        11070209 -- Lower Neosho. Arkansas, Oklahoma.
                                      Area =     2170 sq.mi.


  Subregion  1108 -- Upper Canadian: The Canadian River Basin above its
                     intersect with the New Mexico-Texas state line.
                     Colorado, New Mexico.
                       Area =    12500 sq.mi.

    Accounting Unit 110800 -- Upper Canadian. Colorado, New Mexico.
                                Area =    12500 sq.mi.

      Cataloging Units  11080001 -- Canadian headwaters. Colorado,
                                    New Mexico.
                                      Area =     1730 sq.mi.
                        11080002 -- Cimarron. New Mexico.
                                      Area =     1040 sq.mi.
                        11080003 -- Upper Canadian. New Mexico.
                                      Area =     2020 sq.mi.
                        11080004 -- Mora. New Mexico.
                                      Area =     1470 sq.mi.
                        11080005 -- Conchas. New Mexico.
                                      Area =     1030 sq.mi.
                        11080006 -- Upper Canadian-Ute Reservoir.
                                    New Mexico, Texas.
                                      Area =     2390 sq.mi.
                        11080007 -- Ute. New Mexico.
                                      Area =     2070 sq.mi.
                        11080008 -- Revuelto. New Mexico.
                                      Area =      780 sq.mi.


  Subregion  1109 -- Lower Canadian: The Canadian River Basin below its
                     intersect with the New Mexico-Texas state line
                     to the confluence with the Arkansas River,
                     including that portion inundated by Eufaula Lake
                     and Robert S. Kerr Reservoir, but excluding the
                     North Canadian River Basin. New Mexico,
                     Oklahoma, Texas.
                       Area =    16800 sq.mi.

    Accounting Unit 110901 -- Middle Canadian: The Canadian River Basin
                              below its intersect with the
                              New Mexico-Texas state line to its
                              intersect with the Oklahoma-Texas state
                              line. New Mexico, Oklahoma, Texas.
                                Area =    10100 sq.mi.

      Cataloging Units  11090101 -- Middle Canadian-Trujillo. New
                                    Mexico, Texas.
                                      Area =     1700 sq.mi.
                        11090102 -- Punta De Agua. New Mexico, Texas.
                                      Area =     1560 sq.mi.
                        11090103 -- Rita Blanca. New Mexico, Oklahoma,
                                    Texas.
                                      Area =     1130 sq.mi.
                        11090104 -- Carrizo. New Mexico, Texas.
                                      Area =      864 sq.mi.
                        11090105 -- Lake Meredith. Texas.
                                      Area =     2060 sq.mi.
                        11090106 -- Middle Canadian-Spring. Texas.
                                      Area =     2780 sq.mi.

    Accounting Unit 110902 -- Lower Canadian: The Canadian River Basin
                              below its intersect with the Oklahoma-
                              Texas state line to the confluence with
                              the Arkansas River, including that portion
                              inundated by Eufaula Lake and Robert S.
                              Kerr Reservoir, but excluding the North
                              Canadian River Basin. Oklahoma, Texas.
                                Area =     6750 sq.mi.

      Cataloging Units  11090201 -- Lower Canadian-Deer. Oklahoma,
                                    Texas.
                                      Area =     2010 sq.mi.
                        11090202 -- Lower Canadian-Walnut. Oklahoma.
                                      Area =     1800 sq.mi.
                        11090203 -- Little. Oklahoma.
                                      Area =      976 sq.mi.
                        11090204 -- Lower Canadian. Oklahoma.
                                      Area =     1960 sq.mi.


  Subregion  1110 -- North Canadian: The North Canadian River Basin,
                     including that portion inundated by Eufaula Lake.
                     Kansas, New Mexico, Oklahoma, Texas.
                       Area =    17500 sq.mi.

    Accounting Unit 111001 -- Upper Beaver. The Beaver River Basin to
                              and including the Home Creek Basin.
                              Kansas, New Mexico, Oklahoma,
                              Texas.
                                Area =     7800 sq.mi.

      Cataloging Units  11100101 -- Upper Beaver. New Mexico,
                                    Oklahoma, Texas.
                                      Area =     2710 sq.mi.
                        11100102 -- Middle Beaver. Kansas, Oklahoma.
                                      Area =     1280 sq.mi.
                        11100103 -- Coldwater. Oklahoma, Texas.
                                      Area =     1780 sq.mi.
                        11100104 -- Palo Duro. Oklahoma, Texas.
                                      Area =     2030 sq.mi.

    Accounting Unit 111002 -- Lower Beaver: The Beaver River Basin below
                              the Home Creek Basin to and
                              including the Wolf Creek Basin.
                              Oklahoma, Texas.
                                Area =     3590 sq.mi.

      Cataloging Units  11100201 -- Lower Beaver. Oklahoma, Texas.
                                      Area =     1740 sq.mi.
                        11100202 -- Upper Wolf. Texas.
                                      Area =      779 sq.mi.
                        11100203 -- Lower Wolf. Oklahoma, Texas.
                                      Area =     1070 sq.mi.

    Accounting Unit 111003 -- Lower North Canadian: The North
                              Canadian River Basin, including that
                              portion inundated by Eufaula Lake, but
                              excluding the Beaver River Basin above its
                              confluence with the Wolf Creek Basin.
                              Oklahoma.
                                Area =     6160 sq.mi.

      Cataloging Units  11100301 -- Middle North Canadian. Oklahoma.
                                      Area =     1770 sq.mi.
                        11100302 -- Lower North Canadian. Oklahoma.
                                      Area =     1830 sq.mi.
                        11100303 -- Deep Fork. Oklahoma.
                                      Area =     2560 sq.mi.


  Subregion  1111 -- Lower Arkansas: The Arkansas River Basin below
                     Keystone Dam to the point of highest backwater
                     effect of the Mississippi River below Lock and Dam 4
                     on the Arkansas River, but excluding the Canadian,
                     Neosho, and Verdigris River Basins. Arkansas,
                     Oklahoma.
                       Area =    15600 sq.mi.

    Accounting Unit 111101 -- Robert S. Kerr Reservoir: The Arkansas
                              River Basin below Keystone Dam to Lock and
                              Dam 13, but excluding the Canadian,
                              Neosho, and Verdigris River Basins.
                              Arkansas. Oklahoma.
                                Area =     7340 sq.mi.

      Cataloging Units  11110101 -- Polecat-Snake. Oklahoma.
                                      Area =     1310 sq.mi.
                        11110102 -- Dirty-Greenleaf. Oklahoma.
                                      Area =      769 sq.mi.
                        11110103 -- Illinois. Arkansas, Oklahoma.
                                      Area =     1620 sq.mi.
                        11110104 -- Robert S. Kerr Reservoir.
                                    Arkansas, Oklahoma.
                                      Area =     1780 sq.mi.
                        11110105 -- Poteau. Arkansas, Oklahoma.
                                      Area =     1860 sq.mi.

    Accounting Unit 111102 -- Lower Arkansas-Fourche La Fave: The
                              Arkansas River Basin below Lock and Dam
                              13 to the point of highest backwater
                              effect of the Mississippi River below Lock
                              and Dam 4 on the Arkansas River.
                              Arkansas.
                                Area =     8300 sq.mi.

      Cataloging Units  11110201 -- Frog-Mulberry. Arkansas.
                                      Area =     1270 sq.mi.
                        11110202 -- Dardanelle Reservoir. Arkansas.
                                      Area =     1860 sq.mi.
                        11110203 -- Lake Conway-Point Remove.
                                    Arkansas.
                                      Area =     1140 sq.mi.
                        11110204 -- Petit Jean. Arkansas.
                                      Area =     1070 sq.mi.
                        11110205 -- Cadron. Arkansas.
                                      Area =      751 sq.mi.
                        11110206 -- Fourche La Fave. Arkansas.
                                      Area =     1100 sq.mi.
                        11110207 -- Lower Arkansas-Maumelle.
                                    Arkansas.
                                      Area =     1100 sq.mi.


  Subregion  1112 -- Red headwaters: The North Fork Red River,
                     Prairie Dog Town Fork Red River, and the Salt Fork
                     Red River Basins. New Mexico, Oklahoma, Texas.
                       Area =    14600 sq.mi.

    Accounting Unit 111201 -- Prairie Dog Town Fork Red: The Prairie Dog
                              Town Fork Red River Basin. New Mexico,
                              Oklahoma, Texas.
                                Area =     7630 sq.mi.

      Cataloging Units  11120101 -- Tierra Blanca. New Mexico,
                                    Texas.
                                      Area =     1910 sq.mi.
                        11120102 -- Palo Duro. New Mexico, Texas.
                                      Area =      966 sq.mi.
                        11120103 -- Upper Prairie Dog Town Fork Red.
                                    Texas.
                                      Area =     2120 sq.mi.
                        11120104 -- Tule. Texas.
                                      Area =     1100 sq.mi.
                        11120105 -- Lower Prairie Dog Town Fork Red.
                                    Oklahoma, Texas.
                                      Area =     1530 sq.mi.

    Accounting Unit 111202 -- Salt Fork Red: The Salt Fork Red River
                              Basin. Oklahoma, Texas.
                                Area =     2000 sq.mi.

      Cataloging Units  11120201 -- Upper Salt Fork Red. Texas.
                                      Area =      740 sq.mi.
                        11120202 -- Lower Salt Fork Red. Oklahoma,
                                    Texas.
                                      Area =     1260 sq.mi.

    Accounting Unit 111203 -- North Fork Red: The North Fork Red River
                              Basin. Oklahoma, Texas.
                                Area =     5000 sq.mi.

      Cataloging Units  11120301 -- Upper North Fork Red. Texas.
                                      Area =     1160 sq.mi.
                        11120302 -- Middle North Fork Red. Oklahoma,
                                    Texas.
                                      Area =     1630 sq.mi.
                        11120303 -- Lower North Fork Red. Oklahoma.
                                      Area =     1330 sq.mi.
                        11120304 -- Elm Fork Red. Oklahoma, Texas.
                                      Area =      878 sq.mi.


  Subregion  1113 -- Red - Washita: The Red River Basin above
                     Denison Dam, excluding the North Fork Red
                     River, Prairie Dog Town Fork Red River, and the
                     Salt Fork Red River Basins. Oklahoma, Texas.
                       Area =    24600 sq.mi.

    Accounting Unit 111301 -- Red-Pease: The Red River Basin
                              from the Prairie Dog Town Fork Red River
                              Basin to the Cache Creek Basin,
                              excluding the North Fork Red River and the
                              Salt Fork Red River Basins. Oklahoma,
                              Texas.
                                Area =     5730 sq.mi.

      Cataloging Units  11130101 -- Groesbeck-Sandy. Oklahoma,
                                    Texas.
                                      Area =     1300 sq.mi.
                        11130102 -- Blue-China. Oklahoma, Texas.
                                      Area =      794 sq.mi.
                        11130103 -- North Pease. Texas.
                                      Area =     1460 sq.mi.
                        11130104 -- Middle Pease. Texas.
                                      Area =     1420 sq.mi.
                        11130105 -- Pease. Texas.
                                      Area =      760 sq.mi.

    Accounting Unit 111302 -- Red-Lake Texoma: The Red River Basin from
                              and including the Cache Creek
                              Basin to Denison
                              Dam, including that portion inundated by
                              Lake Texoma, but excluding the Washita
                              River Basin. Oklahoma, Texas.
                                Area =    11000 sq.mi.

      Cataloging Units  11130201 -- Farmers-Mud. Oklahoma, Texas.
                                      Area =     2340 sq.mi.
                        11130202 -- Cache. Oklahoma.
                                      Area =      785 sq.mi.
                        11130203 -- West Cache. Oklahoma.
                                      Area =     1120 sq.mi.
                        11130204 -- North Wichita. Texas.
                                      Area =     1090 sq.mi.
                        11130205 -- South Wichita. Texas.
                                      Area =      702 sq.mi.
                        11130206 -- Wichita. Texas.
                                      Area =     1010 sq.mi.
                        11130207 -- Southern Beaver. Texas.
                                      Area =      679 sq.mi.
                        11130208 -- Northern Beaver. Oklahoma.
                                      Area =      847 sq.mi.
                        11130209 -- Little Wichita. Texas.
                                      Area =     1470 sq.mi.
                        11130210 -- Lake Texoma. Oklahoma, Texas.
                                      Area =      982 sq.mi.

    Accounting Unit 111303 -- Washita. The Washita River Basin,
                              including that portion inundated by Lake
                              Texoma. Oklahoma.
                                Area =     7870 sq.mi.

      Cataloging Units  11130301 -- Washita headwaters. Oklahoma,
                                    Texas.
                                      Area =     1460 sq.mi.
                        11130302 -- Upper Washita. Oklahoma.
                                      Area =     3190 sq.mi.
                        11130303 -- Middle Washita. Oklahoma.
                                      Area =     2490 sq.mi.
                        11130304 -- Lower Washita. Oklahoma.
                                      Area =      727 sq.mi.


  Subregion  1114 -- Red-Sulphur: The Red River Basin below Denison Dam
                     to and including the Bayou Rigolette Basin at the
                     point of highest backwater effect of the
                     Mississippi River. Arkansas, Louisiana,
                     Oklahoma, Texas.
                       Area =    27600 sq.mi.

    Accounting Unit 111401 -- Red-Little: The Red River Basin below
                              Denison Dam to and including the Little
                              River Basin. Arkansas, Oklahoma,
                              Texas.
                                Area =    12500 sq.mi.

      Cataloging Units  11140101 -- Bois D'arc-Island. Oklahoma,
                                    Texas.
                                      Area =     2010 sq.mi.
                        11140102 -- Blue. Oklahoma.
                                      Area =      643 sq.mi.
                        11140103 -- Muddy Boggy. Oklahoma.
                                      Area =     1420 sq.mi.
                        11140104 -- Clear Boggy. Oklahoma.
                                      Area =     1000 sq.mi.
                        11140105 -- Kiamichi. Arkansas, Oklahoma.
                                      Area =     1820 sq.mi.
                        11140106 -- Pecan-Waterhole. Arkansas,
                                    Oklahoma, Texas.
                                      Area =     1460 sq.mi.
                        11140107 -- Upper Little. Oklahoma.
                                      Area =     1400 sq.mi.
                        11140108 -- Mountain Fork. Arkansas, Oklahoma.
                                      Area =      821 sq.mi.
                        11140109 -- Lower Little. Arkansas, Oklahoma.
                                      Area =     1950 sq.mi.

    Accounting Unit 111402 -- Red-Saline: The Red River Basin below
                              the Little River Basin to and
                              including the Bayou Rigolette Basin at the
                              point of highest backwater effect of the
                              Mississippi River, excluding the Big
                              Cypress and Sulphur River Basins.
                              Arkansas, Louisiana.
                                Area =     7740 sq.mi.

      Cataloging Units  11140201 -- Mckinney-Posten Bayous. Arkansas,
                                    Louisiana, Texas.
                                      Area =      906 sq.mi.
                        11140202 -- Middle Red-Coushatta. Louisiana.
                                      Area =      276 sq.mi.
                        11140203 -- Loggy Bayou. Arkansas, Louisiana.
                                      Area =     1470 sq.mi.
                        11140204 -- Red Chute. Louisiana.
                                      Area =      381 sq.mi.
                        11140205 -- Bodcau Bayou. Arkansas, Louisiana.
                                      Area =      766 sq.mi.
                        11140206 -- Bayou Pierre. Louisiana.
                                      Area =     1110 sq.mi.
                        11140207 -- Lower Red-Lake Iatt. Louisiana.
                                      Area =     1450 sq.mi.
                        11140208 -- Saline Bayou. Louisiana.
                                      Area =      477 sq.mi.
                        11140209 -- Black Lake Bayou. Louisiana.
                                      Area =      908 sq.mi.

    Accounting Unit 111403 -- Big Cypress - Sulphur. The Cross Bayou and
                              Sulphur River Basins, including
                              the Big Cypress Creek Basin.
                              Arkansas, Louisiana.
                                Area =     7310 sq.mi.

      Cataloging Units  11140301 -- Sulphur headwaters. Texas.
                                      Area =     1160 sq.mi.
                        11140302 -- Lower Sulphur. Arkansas, Texas.
                                      Area =     1810 sq.mi.
                        11140303 -- White Oak Bayou. Texas.
                                      Area =      783 sq.mi.
                        11140304 -- Cross Bayou. Arkansas, Louisiana,
                                    Texas.
                                      Area =      756 sq.mi.
                        11140305 -- Lake O'the Pines. Texas.
                                      Area =      901 sq.mi.
                        11140306 -- Caddo Lake. Louisiana, Texas.
                                      Area =     1180 sq.mi.
                        11140307 -- Little Cypress. Texas.
                                      Area =      720 sq.mi.


Region 12  Texas-Gulf Region -- The drainage that discharges into the
           Gulf of Mexico from and including Sabine Pass to
           the Rio Grande Basin boundary. Includes parts of
           Louisiana, New Mexico, and Texas.


  Subregion  1201 -- Sabine: The Sabine River Basin above Sabine Lake.
                     Louisiana, Texas.
                       Area =     9860 sq.mi.

    Accounting Unit 120100 -- Sabine. Louisiana, Texas.
                                Area =     9860 sq.mi.

      Cataloging Units  12010001 -- Upper Sabine. Texas.
                                      Area =     1380 sq.mi.
                        12010002 -- Middle Sabine. Louisiana, Texas.
                                      Area =     2760 sq.mi.
                        12010003 -- Lake Fork. Texas.
                                      Area =      689 sq.mi.
                        12010004 -- Toledo Bend Reservoir. Louisiana,
                                    Texas.
                                      Area =     2390 sq.mi.
                        12010005 -- Lower Sabine. Louisiana, Texas.
                                      Area =     2640 sq.mi.


  Subregion  1202 -- Neches: The Neches River Basin above Sabine Lake.
                     Texas.
                       Area =    10000 sq.mi.

    Accounting Unit 120200 -- Neches. Texas.
                                Area =    10000 sq.mi.

      Cataloging Units  12020001 -- Upper Neches. Texas.
                                      Area =     1940 sq.mi.
                        12020002 -- Middle Neches. Texas.
                                      Area =     1630 sq.mi.
                        12020003 -- Lower Neches. Texas.
                                      Area =     1130 sq.mi.
                        12020004 -- Upper Angelina. Texas.
                                      Area =     1610 sq.mi.
                        12020005 -- Lower Angelina. Texas.
                                      Area =     1940 sq.mi.
                        12020006 -- Village. Texas.
                                      Area =     1100 sq.mi.
                        12020007 -- Pine Island Bayou. Texas.
                                      Area =      670 sq.mi.


  Subregion  1203 -- Trinity: The Trinity River Basin above Trinity
                     Bay. Texas.
                       Area =   18000 sq.mi.

    Accounting Unit 120301 -- Upper Trinity: The Trinity River Basin
                              above and including the Richland Creek
                              Basin. Texas.
                                Area =    11800 sq.mi.

      Cataloging Units  12030101 -- Upper West Fork Trinity. Texas.
                                      Area =     1970 sq.mi.
                        12030102 -- Lower West Fork Trinity. Texas.
                                      Area =     1510 sq.mi.
                        12030103 -- Elm Fork Trinity. Texas.
                                      Area =     1840 sq.mi.
                        12030104 -- Denton. Texas.
                                      Area =      727 sq.mi.
                        12030105 -- Upper Trinity. Texas.
                                      Area =     1370 sq.mi.
                        12030106 -- East Fork Trinity. Texas.
                                      Area =     1300 sq.mi.
                        12030107 -- Cedar. Texas.
                                      Area =     1070 sq.mi.
                        12030108 -- Richland. Texas.
                                      Area =      917 sq.mi.
                        12030109 -- Chambers. Texas.
                                      Area =     1070 sq.mi.

    Accounting Unit 120302 -- Lower Trinity: The Trinity River Basin
                     below the Richland Creek Basin to but
                     excluding Trinity Bay. Texas.
                                Area =     6210 sq.mi.

      Cataloging Units  12030201 -- Lower Trinity-Tehuacana. Texas.
                                      Area =     2140 sq.mi.
                        12030202 -- Lower Trinity-Kickapoo. Texas.
                                      Area =     3250 sq.mi.
                        12030203 -- Lower Trinity. Texas.
                                      Area =      815 sq.mi.


  Subregion  1204 -- Galveston Bay-San Jacinto: The coastal drainage
                     and associated waters from and including Sabine
                     Pass to the Brazos River Basin boundary, but
                     excluding the Neches and Sabine River Basins above
                     Sabine Lake and the Trinity River Basin above
                     Trinity Bay. Louisiana, Texas.
                       Area =     7980 sq.mi.

    Accounting Unit 120401 -- San Jacinto: The San Jacinto River Basin
                              above Galveston Bay. Texas.
                                Area =     3980 sq.mi.

      Cataloging Units  12040101 -- West Fork San Jacinto. Texas.
                                      Area =     1080 sq.mi.
                        12040102 -- Spring. Texas.
                                      Area =      760 sq.mi.
                        12040103 -- East Fork San Jacinto. Texas.
                                      Area =     1010 sq.mi.
                        12040104 -- Buffalo-San Jacinto. Texas.
                                      Area =     1130 sq.mi.

    Accounting Unit 120402 -- Galveston Bay-Sabine Lake: The coastal
                              drainage and associated waters from and
                              including Sabine Pass to the Brazos River
                              Basin boundary, but excluding the Neches
                              and Sabine River Basins above the Sabine Lake,
                              the Trinity River Basin above Trinity
                              Bay, and the San Jacinto River above
                              Galveston Bay. Louisiana, Texas.
                                Area =     4000 sq.mi.

      Cataloging Units  12040201 -- Sabine Lake. Louisiana, Texas.
                                      Area =     1040 sq.mi.
                        12040202 -- East Galveston Bay. Texas.
                                      Area =      795 sq.mi.
                        12040203 -- North Galveston Bay. Texas.
                                      Area =      395 sq.mi.
                        12040204 -- West Galveston Bay. Texas.
                                      Area =     1130 sq.mi.
                        12040205 -- Austin-Oyster. Texas.
                                      Area =      637 sq.mi.


  Subregion  1205 -- Brazos headwaters: The Brazos River Basin above the
                     confluence of and including the Double Mountain Fork
                     Brazos River and the Salt Fork Brazos River Basins.
                     New Mexico, Texas.
                       Area =    14600 sq.mi.

    Accounting Unit 120500 -- Brazos headwaters. New Mexico, Texas.
                                Area =    14600 sq.mi.

      Cataloging Units  12050001 -- Yellow House Draw. New Mexico,
                                    Texas.
                                      Area =     3780 sq.mi.
                        12050002 -- Blackwater Draw. New Mexico, Texas.
                                      Area =     1560 sq.mi.
                        12050003 -- North Fork Double Mountain Fork
                                    Brazos. Texas.
                                      Area =     1050 sq.mi.
                        12050004 -- Double Moutain Fork Brazos. Texas.
                                      Area =     2740 sq.mi.
                        12050005 -- Running Water Draw. New Mexico,
                                    Texas.
                                      Area =     1620 sq.mi.
                        12050006 -- White. Texas.
                                      Area =     1690 sq.mi.
                        12050007 -- Salt Fork Brazos. Texas.
                                      Area =     2150 sq.mi.


  Subregion  1206 -- Middle Brazos: The Brazos River Basin below the
                     confluence of the Double Mountain Fork Brazos River
                     and the Salt Fork Brazos River Basins to and
                     including the Castleman Creek Basin.
                     Texas.
                       Area =    15500 sq.mi.

    Accounting Unit 120601 -- Middle Brazos-Clear Fork: The Brazos River
                              Basin below the confluence of the Double
                              Mountain Fork Brazos River and the
                              Salt Fork Brazos River Basins to and
                              including the Clear Fork Brazos River
                              Basin. Texas.
                                Area =     8220 sq.mi.

      Cataloging Units  12060101 -- Middle Brazos-Millers. Texas.
                                      Area =     2490 sq.mi.
                        12060102 -- Upper Clear Fork Brazos. Texas.
                                      Area =     2730 sq.mi.
                        12060103 -- Paint. Texas.
                                      Area =     1080 sq.mi.
                        12060104 -- Lower Clear Fork Brazos. Texas.
                                      Area =      620 sq.mi.
                        12060105 -- Hubbard. Texas.
                                      Area =     1300 sq.mi.

    Accounting Unit 120602 -- Middle Brazos-Bosque: The Brazos River
                              Basin below the Clear Fork Brazos
                              River Basin to and including the
                              Castleman Creek Basin. Texas.
                                Area =     7320 sq.mi.

      Cataloging Units  12060201 -- Middle Brazos-Palo Pinto. Texas.
                                      Area =     3160 sq.mi.
                        12060202 -- Middle Brazos-Lake Whitney. Texas.
                                      Area =     2500 sq.mi.
                        12060203 -- Bosque. Texas.
                                      Area =      418 sq.mi.
                        12060204 -- North Bosque. Texas.
                                      Area =     1240 sq.mi.

  Subregion  1207 -- Lower Brazos: The Brazos River Basin below
                     the Castleman Creek Basin.
                     Texas.
                       Area =    15600 sq.mi.

    Accounting Unit 120701 -- Lower Brazos: The Brazos River Basin
                              below the Castleman Creek
                              Basin, excluding the Little
                              River Basin. Texas.
                                Area =     7960 sq.mi.

      Cataloging Units  12070101 -- Lower Brazos-Little Brazos. Texas.
                                      Area =     2720 sq.mi.
                        12070102 -- Yegua. Texas.
                                      Area =     1330 sq.mi.
                        12070103 -- Navasota. Texas.
                                      Area =     2260 sq.mi.
                        12070104 -- Lower Brazos. Texas.
                                      Area =     1650 sq.mi.

    Accounting Unit 120702 -- Little: The Little River Basin. Texas.
                                Area =     7610 sq.mi.

      Cataloging Units  12070201 -- Leon. Texas.
                                      Area =     3000 sq.mi.
                        12070202 -- Cowhouse. Texas.
                                      Area =      743 sq.mi.
                        12070203 -- Lampasas. Texas.
                                      Area =     1510 sq.mi.
                        12070204 -- Little. Texas.
                                      Area =     1000 sq.mi.
                        12070205 -- San Gabriel. Texas.
                                      Area =     1360 sq.mi.


  Subregion  1208 -- Upper Colorado: The Colorado River Basin above and
                     including the Oak Creek Basin. New Mexico,
                     Texas.
                       Area =    16000 sq.mi.

    Accounting Unit 120800 -- Upper Colorado. New Mexico, Texas.
                                Area =    16000 sq.mi.

      Cataloging Units  12080001 -- Lost Draw. New Mexico, Texas.
                                      Area =     2370 sq.mi.
                        12080002 -- Colorado headwaters. Texas.
                                      Area =     2680 sq.mi.
                        12080003 -- Monument-Seminole Draws.
                                    New Mexico, Texas.
                                      Area =     2680 sq.mi.
                        12080004 -- Mustang Draw. New Mexico, Texas.
                                      Area =     2640 sq.mi.
                        12080005 -- Johnson Draw. Texas.
                                      Area =     1910 sq.mi.
                        12080006 -- Sulphur Springs Draw. New Mexico,
                                    Texas.
                                      Area =     1720 sq.mi.
                        12080007 -- Beals. Texas.
                                      Area =      632 sq.mi.
                        12080008 -- Upper Colorado. Texas.
                                      Area =     1380 sq.mi.


  Subregion  1209 -- Lower Colorado-San Bernard Coastal: The Colorado
                     River Basin below the Oak Creek
                     Basin; and the Coastal drainage and
                     associated waters from the Brazos River Basin
                     boundary to the Colorado River Basin boundary.
                     Texas.
                       Area =    28400 sq.mi.

    Accounting Unit 120901 -- Middle Colorado-Concho: The Colorado
                              River Basin below the Oak
                              Creek Basin to and including
                              the San Saba River Basin. Texas.
                                Area =    15200 sq.mi.

      Cataloging Units  12090101 -- Middle Colorado-Elm. Texas.
                                      Area =     1160 sq.mi.
                        12090102 -- South Concho. Texas.
                                      Area =     1350 sq.mi.
                        12090103 -- Middle Concho. Texas.
                                      Area =     2650 sq.mi.
                        12090104 -- North Concho. Texas.
                                      Area =     1510 sq.mi.
                        12090105 -- Concho. Texas.
                                      Area =     1240 sq.mi.
                        12090106 -- Middle Colorado. Texas.
                                      Area =     1980 sq.mi.
                        12090107 -- Pecan Bayou. Texas.
                                      Area =     1410 sq.mi.
                        12090108 -- Jim Ned. Texas.
                                      Area =      780 sq.mi.
                        12090109 -- San Saba. Texas.
                                      Area =     2330 sq.mi.
                        12090110 -- Brady. Texas.
                                      Area =      786 sq.mi.

    Accounting Unit 120902 -- Middle Colorado-Llano: The Colorado River
                              Basin below the San Saba
                              River Basin to and including the
                              Onion Creek Basin. Texas.
                                Area =     8350 sq.mi.

      Cataloging Units  12090201 -- Buchanan-Lyndon B. Johnson Lakes.
                                    Texas.
                                      Area =     1260 sq.mi.
                        12090202 -- North Llano. Texas.
                                      Area =      942 sq.mi.
                        12090203 -- South Llano. Texas.
                                      Area =      937 sq.mi.
                        12090204 -- Llano. Texas.
                                      Area =     2650 sq.mi.
                        12090205 -- Austin-Travis Lakes. Texas.
                                      Area =     1260 sq.mi.
                        12090206 -- Pedernales. Texas.
                                      Area =     1300 sq.mi.

    Accounting Unit 120903 -- Lower Colorado: The Colorado River Basin
                              below the Onion Creek
                              Basin to its point of discharge
                              into the Gulf of Mexico. Texas.
                                Area =     2930 sq.mi.

      Cataloging Units  12090301 -- Lower Colorado-Cummins. Texas.
                                      Area =     2220 sq.mi.
                        12090302 -- Lower Colorado. Texas.
                                      Area =      706 sq.mi.

    Accounting Unit 120904 -- San Bernard Coastal: The coastal drainage
                              and associated waters from the Brazos
                              River Basin boundary to the Colorado
                              River Basin boundary. Texas.
                                Area =     1920 sq.mi.

      Cataloging Units  12090401 -- San Bernard. Texas.
                                      Area =     1050 sq.mi.
                        12090402 -- East Matagorda Bay. Texas.
                                      Area =      865 sq.mi.


  Subregion  1210 -- Central Texas Coastal: The coastal drainage and
                     associated waters from the Colorado River Basin
                     boundary to Aransas Pass and the Corpus Christi
                     Bay drainage boundary. Texas.
                       Area =    18200 sq.mi.

    Accounting Unit 121001 -- Lavaca: The Lavaca River Basin. Texas.
                                Area =     2340 sq.mi.

      Cataloging Units  12100101 -- Lavaca. Texas.
                                      Area =      903 sq.mi.
                        12100102 -- Navidad. Texas.
                                      Area =     1440 sq.mi.

    Accounting Unit 121002 -- Guadalupe: The Guadalupe River Basin,
                              excluding the San Antonio River Basin.
                              Texas.
                                Area =     6040 sq.mi.

      Cataloging Units  12100201 -- Upper Guadalupe. Texas.
                                      Area =     1450 sq.mi.
                        12100202 -- Middle Guadalupe. Texas.
                                      Area =     2160 sq.mi.
                        12100203 -- San Marcos. Texas.
                                      Area =     1370 sq.mi.
                        12100204 -- Lower Guadalupe. Texas.
                                      Area =     1060 sq.mi.

    Accounting Unit 121003 -- San Antonio: The San Antonio River Basin.
                              Texas.
                                Area =     4270 sq.mi.

      Cataloging Units  12100301 -- Upper San Antonio. Texas.
                                      Area =      524 sq.mi.
                        12100302 -- Medina. Texas.
                                      Area =     1380 sq.mi.
                        12100303 -- Lower San Antonio. Texas.
                                      Area =     1500 sq.mi.
                        12100304 -- Cibolo. Texas.
                                      Area =      861 sq.mi.

    Accounting Unit 121004 -- Central Texas Coastal: The coastal
                              drainage and associated waters from the
                              Colorado River Basin boundary to
                              Aransas Pass and the Corpus Christi Bay
                              drainage boundary, excluding the Guadalupe,
                              Lavaca, and San Antonio River Basins.
                              Texas.
                                Area =     5540 sq.mi.

      Cataloging Units  12100401 -- Central Matagorda Bay. Texas.
                                      Area =     1300 sq.mi.
                        12100402 -- West Matagorda Bay. Texas.
                                      Area =      922 sq.mi.
                        12100403 -- East San Antonio Bay. Texas.
                                      Area =      392 sq.mi.
                        12100404 -- West San Antonio Bay. Texas.
                                      Area =      155 sq.mi.
                        12100405 -- Aransas Bay. Texas.
                                      Area =      855 sq.mi.
                        12100406 -- Mission. Texas.
                                      Area =     1050 sq.mi.
                        12100407 -- Aransas. Texas.
                                      Area =      863 sq.mi.


  Subregion  1211 -- Nueces-Southwestern Texas Coastal: The coastal
                     drainage and associated waters from Aransas Pass,
                     including the Corpus Christi Bay and Nueces River
                     drainages, to the Rio Grande Basin boundary.
                     Texas.
                       Area =    29000 sq.mi.

    Accounting Unit 121101 -- Nueces: The Nueces River Basin. Texas.
                                Area =    17000 sq.mi.

      Cataloging Units  12110101 -- Nueces headwaters. Texas.
                                      Area =      813 sq.mi.
                        12110102 -- West Nueces. Texas.
                                      Area =      911 sq.mi.
                        12110103 -- Upper Nueces. Texas.
                                      Area =     1900 sq.mi.
                        12110104 -- Turkey. Texas.
                                      Area =     1590 sq.mi.
                        12110105 -- Middle Nueces. Texas.
                                      Area =     3400 sq.mi.
                        12110106 -- Upper Frio. Texas.
                                      Area =     2390 sq.mi.
                        12110107 -- Hondo. Texas.
                                      Area =     1100 sq.mi.
                        12110108 -- Lower Frio. Texas.
                                      Area =     1250 sq.mi.
                        12110109 -- San Miguel. Texas.
                                      Area =      869 sq.mi.
                        12110110 -- Atascosa. Texas.
                                      Area =     1420 sq.mi.
                        12110111 -- Lower Nueces. Texas
                                      Area =     1370

    Accounting Unit 121102 -- Southwestern Texas Coastal: The coastal
                              drainage and associated waters from
                              Aransas Pass, including the Corpus Christi
                              Bay drainage, to the Rio Grande Basin
                              boundary, excluding the Nueces River
                              Basin. Texas.
                                Area =    12000 sq.mi.

      Cataloging Units  12110201 -- North Corpus Christi Bay. Texas.
                                      Area =      170 sq.mi.
                        12110202 -- South Corpus Christi Bay. Texas.
                                      Area =      451 sq.mi.
                        12110203 -- North Laguna Madre. Texas.
                                      Area =      229 sq.mi.
                        12110204 -- San Fernando. Texas.
                                      Area =     1350 sq.mi.
                        12110205 -- Baffin Bay. Texas.
                                      Area =     2150 sq.mi.
                        12110206 -- Palo Blanco. Texas.
                                      Area =     1010 sq.mi.
                        12110207 -- Central Laguna Madre. Texas.
                                      Area =     3650 sq.mi.
                        12110208 -- South Laguna Madre. Texas.
                                      Area =     2960 sq.mi.


Region 13  Rio Grande Region -- The drainage within the United states of:
           (a) the Rio Grande Basin, and (b) the San Luis Valley, North
           Plains, Plains of San Agustin, Mimbres River, Estancia,
           Jornada Del Muerto, Tularosa Valley, Salt Basin, and Other
           Closed  Basins. Includes parts of Colorado, New Mexico,
           and Texas.


  Subregion  1301 -- Rio Grande headwaters: The Rio Grande Basin from
                     its headwaters to the river's intersect with the
                     Colorado-New Mexico state line, including the San
                     Luis Valley closed basin. Colorado, New Mexico.
                       Area =     7580 sq.mi.

    Accounting Unit 130100 -- Rio Grande headwaters. Colorado,
                              New Mexico.
                                Area =     7580 sq.mi.

      Cataloging Units  13010001 -- Rio Grande headwaters. Colorado.
                                      Area =     1320 sq.mi.
                        13010002 -- Alamosa-Trinchera. Colorado,
                                    New Mexico.
                                      Area =     2560 sq.mi.
                        13010003 -- San Luis. Colorado.
                                      Area =     1590 sq.mi.
                        13010004 -- Saguache. Colorado.
                                      Area =     1320 sq.mi.
                        13010005 -- Conejos. Colorado, New Mexico.
                                      Area =      790 sq.mi.


  Subregion  1302 -- Rio Grande-Elephant Butte: The Rio Grande Basin
                     from the Colorado-New Mexico state line to and
                     including Elephant Butte Reservoir, and including
                     the North Plains, Jornada Del Muerto, and Plains of
                     San Agustin closed basins. Colorado, New Mexico.
                       Area =    26900 sq.mi.

    Accounting Unit 130201 -- Upper Rio Grande: The Rio Grande Basin
                              from the Colorado-New Mexico state line
                              to and including the Guaje Canyon drainage
                              Basin. Colorado, New Mexico.
                                Area =     6370 sq.mi.

      Cataloging Units  13020101 -- Upper Rio Grande. Colorado,
                                    New Mexico.
                                      Area =     3220 sq.mi.
                        13020102 -- Rio Chama. Colorado, New Mexico.
                                      Area =     3150 sq.mi.

    Accounting Unit 130202 -- Rio Grande-Elephant Butte: The Rio Grande
                              Basin below the Guaje Canyon drainage basin
                              to and including Elephant Butte Reservoir,
                              and including the North Plains, Jornada
                              Del Muerto, and Plains of San Agustin
                              closed basins. New Mexico.
                                Area =    20500 sq.mi.

      Cataloging Units  13020201 -- Rio Grande-Santa Fe. New Mexico.
                                      Area =     1830 sq.mi.
                        13020202 -- Jemez. New Mexico.
                                      Area =     1040 sq.mi.
                        13020203 -- Rio Grande-Albuquerque. New Mexico.
                                      Area =     3200 sq.mi.
                        13020204 -- Rio Puerco. New Mexico.
                                      Area =     2090 sq.mi.
                        13020205 -- Arroyo Chico. New Mexico.
                                      Area =     1360 sq.mi.
                        13020206 -- North Plains. New Mexico.
                                      Area =     1130 sq.mi.
                        13020207 -- Rio San Jose. New Mexico.
                                      Area =     2620 sq.mi.
                        13020208 -- Plains of San Agustin.
                                    New Mexico.
                                      Area =     1970 sq.mi.
                        13020209 -- Rio Salado. New Mexico.
                                      Area =     1390 sq.mi.
                        13020210 -- Jornada Del Muerto. New Mexico.
                                      Area =     1800 sq.mi.
                        13020211 -- Elephant Butte Reservoir.
                                    New Mexico.
                                      Area =     2110 sq.mi.


  Subregion  1303 -- Rio Grande-Mimbres: The drainage within the
                     United states of the Rio Grande Basin from Elephant
                     Butte Reservoir to the junction of the Mexico,
                     New Mexico, and Texas international boundary, and
                     including the Jornada Draw, Mimbres River, and
                     Other closed basins west of the Rio Grande.
                     New Mexico, Texas.
                       Area =    11100 sq.mi.

    Accounting Unit 130301 -- Rio Grande-Caballo: The drainage within
                              the United states of the Rio Grande Basin
                              from Elephant Butte Reservoir to the
                              junction of the Mexico, New Mexico, and
                              Texas international boundary, and
                              including the Jornada Draw closed basin.
                              New Mexico, Texas.
                                Area =     4890 sq.mi.

      Cataloging Units  13030101 -- Caballo. New Mexico.
                                      Area =     1230 sq.mi.
                        13030102 -- El Paso-Las Cruces. New Mexico,
                                    Texas.
                                      Area =     2400 sq.mi.
                        13030103 -- Jornada Draw. New Mexico.
                                      Area =     1260 sq.mi.

    Accounting Unit 130302 -- Mimbres: The drainage within the
                              United states of the Mimbres River and
                              Other closed basins west of the Rio Grande.
                              New Mexico.
                                Area =     6250 sq.mi.

      Cataloging Units  13030201 -- Playas Lake. New Mexico.
                                      Area =     1690 sq.mi.
                        13030202 -- Mimbres. New Mexico.
                                      Area =     4560 sq.mi.


  Subregion  1304 -- Rio Grande-Amistad: The drainage within the
                     United states of the Rio Grande Basin from the
                     Junction of the Mexico, New Mexico, and Texas
                     international boundary to and including Amistad
                     Reservoir, but excluding the Pecos River Basin.
                     Texas.
                       Area =    18700 sq.mi.

    Accounting Unit 130401 -- Rio Grande-Fort Quitman: The drainage
                              within the United states of the Rio Grande
                              Basin from the Junction of the Mexico,
                              New Mexico, and Texas international
                              boundary to the compact point near Fort
                              Quitman.  Texas.
                                Area =     1780 sq.mi.

      Cataloging Unit   13040100 -- Rio Grande-Fort Quitman. Texas.
                                      Area =     1780 sq.mi.

    Accounting Unit 130402 -- Rio Grande-Amistad: The drainage
                              within the United states of the Rio Grande
                              Basin from the compact point near Fort
                              Quitman to and including Amistad Reservoir,
                              but excluding the Pecos and Devils River
                              Basins. Texas.
                                Area =    12700 sq.mi.

      Cataloging Units  13040201 -- Cibolo-Red Light. Texas.
                                      Area =     2170 sq.mi.
                        13040202 -- Alamito. Texas.
                                      Area =     1570 sq.mi.
                        13040203 -- Black Hills-Fresno. Texas.
                                      Area =      617 sq.mi.
                        13040204 -- Terlingua. Texas.
                                      Area =     1290 sq.mi.
                        13040205 -- Big Bend. Texas.
                                      Area =     1100 sq.mi.
                        13040206 -- Maravillas. Texas.
                                      Area =     1320 sq.mi.
                        13040207 -- Santiago Draw. Texas.
                                      Area =      686 sq.mi.
                        13040208 -- Reagan-Sanderson. Texas.
                                      Area =      724 sq.mi.
                        13040209 -- San Francisco. Texas.
                                      Area =     1020 sq.mi.
                        13040210 -- Lozier Canyon. Texas.
                                      Area =      926 sq.mi.
                        13040211 -- Big Canyon. Texas.
                                      Area =      823 sq.mi.
                        13040212 -- Amistad Reservoir. Texas.
                                      Area =      410 sq.mi.

    Accounting Unit 130403 -- Devils: The Devils River Basin. Texas.
                                Area =     4270 sq.mi.

      Cataloging Units  13040301 -- Upper Devils. Texas.
                                      Area =     2650 sq.mi.
                        13040302 -- Lower Devils. Texas.
                                      Area =      893 sq.mi.
                        13040303 -- Dry Devils. Texas.
                                      Area =      729 sq.mi.


  Subregion  1305 -- Rio Grande closed basins: The Estancia, Tularosa
                     Valley, Salt Basin and other closed basins lying
                     between the Rio Grande and the Pecos River
                     Basins. New Mexico, Texas.
                       Area =    17500 sq.mi.

    Accounting Unit 130500 -- Rio Grande closed basins. New Mexico,
                              Texas.
                                Area =    17500 sq.mi.

      Cataloging Units  13050001 -- Western Estancia. New Mexico.
                                      Area =     2400 sq.mi.
                        13050002 -- Eastern Estancia. New Mexico.
                                      Area =      517 sq.mi.
                        13050003 -- Tularosa Valley. New Mexico, Texas.
                                      Area =     6720 sq.mi.
                        13050004 -- Salt Basin. New Mexico, Texas.
                                      Area =     7900 sq.mi.


  Subregion  1306 -- Upper Pecos: The Pecos River Basin to but
                     excluding the Delaware River Basin.
                     New Mexico, Texas.
                       Area =    23500 sq.mi.

    Accounting Unit 130600 -- Upper Pecos. New Mexico, Texas.
                                Area =    23500 sq.mi.

      Cataloging Units  13060001 -- Pecos headwaters. New Mexico.
                                      Area =     3610 sq.mi.
                        13060002 -- Pintada Arroyo. New Mexico.
                                      Area =      884 sq.mi.
                        13060003 -- Upper Pecos. New Mexico.
                                      Area =     4870 sq.mi.
                        13060004 -- Taiban. New Mexico.
                                      Area =      725 sq.mi.
                        13060005 -- Arroyo Del Macho. New Mexico.
                                      Area =     1870 sq.mi.
                        13060006 -- Gallo Arroyo. New Mexico.
                                      Area =      745 sq.mi.
                        13060007 -- Upper Pecos-Long Arroyo. New Mexico.
                                      Area =     2700 sq.mi.
                        13060008 -- Rio Hondo. New Mexico.
                                      Area =     1680 sq.mi.
                        13060009 -- Rio Felix. New Mexico.
                                      Area =      994 sq.mi.
                        13060010 -- Rio Penasco. New Mexico.
                                      Area =     1080 sq.mi.
                        13060011 -- Upper Pecos-Black. New Mexico,
                                    Texas.
                                      Area =     4360 sq.mi.


  Subregion  1307 -- Lower Pecos: The Pecos River Basin from and
                     including the Delaware River Basin to the
                     confluence with the Rio Grande. New Mexico,
                     Texas.
                       Area =    20800 sq.mi.

    Accounting Unit 130700 -- Lower Pecos. New Mexico, Texas.
                                Area =    20800 sq.mi.

      Cataloging Units  13070001 -- Lower Pecos-Red Bluff Reservoir.
                                    New Mexico, Texas.
                                      Area =     4430 sq.mi.
                        13070002 -- Delaware. New Mexico, Texas.
                                      Area =      772 sq.mi.
                        13070003 -- Toyah. Texas.
                                      Area =     1030 sq.mi.
                        13070004 -- Salt Draw. Texas.
                                      Area =     2040 sq.mi.
                        13070005 -- Barrilla Draw. Texas.
                                      Area =      850 sq.mi.
                        13070006 -- Coyanosa-Hackberry Draws. Texas.
                                      Area =     1500 sq.mi.
                        13070007 -- Landreth-Monument Draws. New Mexico,
                                    Texas.
                                      Area =     4270 sq.mi.
                        13070008 -- Lower Pecos. Texas.
                                      Area =     2970 sq.mi.
                        13070009 -- Tunas. Texas.
                                      Area =     1010 sq.mi.
                        13070010 -- Independence. Texas.
                                      Area =      765 sq.mi.
                        13070011 -- Howard Draw. Texas.
                                      Area =     1120 sq.mi.


  Subregion  1308 -- Rio Grande-Falcon: The drainage within
                     the United states of the Rio Grande Basin from
                     Amistad Reservoir to and including Falcon
                     Reservoir. Texas.
                       Area =     5170 sq.mi.

    Accounting Unit 130800 -- Rio Grande-Falcon. Texas.
                                Area =     5170 sq.mi.

      Cataloging Units  13080001 -- Elm-Sycamore. Texas.
                                      Area =     1580 sq.mi.
                        13080002 -- San Ambrosia-Santa Isabel. Texas.
                                      Area =     1760 sq.mi.
                        13080003 -- International Falcon Reservoir.
                                    Texas.
                                      Area =     1830 sq.mi.


  Subregion  1309 -- Lower Rio Grande: The drainage within the
                     United states of the Rio Grande Basin from Falcon
                     Reservoir to the Gulf of Mexico. Texas.
                       Area =     1260 sq.mi.


    Accounting Unit 130900 -- Lower Rio Grande. Texas.
                                Area =     1260 sq.mi.

      Cataloging Units  13090001 -- Los Olmos. Texas.
                                      Area =     1170 sq.mi.
                        13090002 -- Lower Rio Grande. Texas.
                                      Area =       93 sq.mi.


Region 14  Upper Colorado Region -- The drainage of: (a) the Colorado
           River Basin above the Lee Ferry compact point which is
           one mile below the mouth of the Paria River; and (b) the
           Great Divide closed basin. Includes parts of Arizona,
           Colorado, New Mexico, Utah, and Wyoming.


  Subregion  1401 -- Colorado headwaters: The Colorado River Basin to
                     but excluding the Bitter Creek Basin, and
                     excluding the Gunnison River Basin. Colorado, Utah.
                       Area =     9730 sq.mi.

    Accounting Unit 140100 -- Colorado headwaters: Colorado, Utah.
                                Area =     9730 sq.mi.

      Cataloging Units  14010001 -- Colorado headwaters. Colorado.
                                      Area =     2860 sq.mi.
                        14010002 -- Blue. Colorado.
                                      Area =      675 sq.mi.
                        14010003 -- Eagle. Colorado.
                                      Area =      963 sq.mi.
                        14010004 -- Roaring Fork. Colorado.
                                      Area =     1440 sq.mi.
                        14010005 -- Colorado headwaters-Plateau.
                                    Utah.
                                      Area =     3090 sq.mi.
                        14010006 -- Parachute-Roan. Colorado.
                                      Area =      698 sq.mi.


  Subregion  1402 -- Gunnison: The Gunnison River Basin. Colorado.
                       Area =     7930 sq.mi.

    Accounting Unit 140200 -- Gunnison. Colorado.
                                Area =     7930 sq.mi.

      Cataloging Units  14020001 -- East-Taylor. Colorado.
                                      Area =      760 sq.mi.
                        14020002 -- Upper Gunnison. Colorado.
                                      Area =     2380 sq.mi.
                        14020003 -- Tomichi. Colorado.
                                      Area =     1090 sq.mi.
                        14020004 -- North Fork Gunnison. Colorado.
                                      Area =      959 sq.mi.
                        14020005 -- Lower Gunnison. Colorado.
                                      Area =     1630 sq.mi.
                        14020006 -- Uncompahange. Colorado.
                                      Area =     1110 sq.mi.


  Subregion  1403 -- Upper Colorado-Dolores: The Colorado River Basin
                     from and including the Bitter Creek Basin
                     to the confluence with the Green River Basin.
                     Colorado, Utah.
                       Area =     8250 sq.mi.

    Accounting Unit 140300 -- Upper Colorado-Dolores. Colorado, Utah.
                                Area =     8250 sq.mi.

      Cataloging Units  14030001 -- Westwater Canyon. Colorado, Utah.
                                      Area =     1440 sq.mi.
                        14030002 -- Upper Dolores. Colorado, Utah.
                                      Area =     2140 sq.mi.
                        14030003 -- San Miguel. Colorado.
                                      Area =     1530 sq.mi.
                        14030004 -- Lower Dolores. Colorado, Utah.
                                      Area =      904 sq.mi.
                        14030005 -- Upper Colorado-Kane Springs.
                                    Colorado, Utah.
                                      Area =     2240 sq.mi.


  Subregion  1404 -- Great Divide - Upper Green: The Green River Basin
                     above the confluence with the Yampa River Basin; and
                     the Great Divide closed basin. Utah, Wyoming.
                       Area =    20600 sq.mi.

    Accounting Unit 140401 -- Upper Green: The Green River Basin above
                     the confluence with the Yampa River Basin. Utah,
                     Wyoming.
                                Area =    16700 sq.mi.

      Cataloging Units  14040101 -- Upper Green. Wyoming.
                                      Area =     2930 sq.mi.
                        14040102 -- New Fork. Wyoming.
                                      Area =     1220 sq.mi.
                        14040103 -- Upper Green-Slate. Wyoming.
                                      Area =     1480 sq.mi.
                        14040104 -- Big Sandy. Wyoming.
                                      Area =     1810 sq.mi.
                        14040105 -- Bitter. Wyoming.
                                      Area =     2200 sq.mi.
                        14040106 -- Upper Green-Flaming Gorge Reservoir.
                                    Colorado. Utah, Wyoming.
                                      Area =     2460 sq.mi.
                        14040107 -- Blacks Fork. Utah, Wyoming.
                                      Area =     2700 sq.mi.
                        14040108 -- Muddy. Utah, Wyoming.
                                      Area =      968 sq.mi.
                        14040109 -- Vermilion. Colorado, Wyoming.
                                      Area =      961 sq.mi.

    Accounting Unit 140402 -- Great Divide closed basin: The
                              Great Divide closed basin. Wyoming.
                                Area =     3870 sq.mi.

      Cataloging Unit   14040200 -- Great Divide closed basin. Wyoming.
                                      Area =     3870 sq.mi.


  Subregion  1405 -- White-Yampa: The White and Yampa River Basins.
                     Colorado, Utah, Wyoming.
                       Area =    13100 sq.mi.

    Accounting Unit 140500 -- White - Yampa. Colorado, Utah, Wyoming.
                                Area =    13100 sq.mi.

      Cataloging Units  14050001 -- Upper Yampa. Colorado.
                                      Area =     2590 sq.mi.
                        14050002 -- Lower Yampa. Colorado.
                                      Area =     1550 sq.mi.
                        14050003 -- Little Snake. Colorado, Wyoming.
                                      Area =     3060 sq.mi.
                        14050004 -- Muddy. Wyoming.
                                      Area =     1010 sq.mi.
                        14050005 -- Upper White. Colorado.
                                      Area =     1360 sq.mi.
                        14050006 -- Piceance-Yellow. Colorado.
                                      Area =      904 sq.mi.
                        14050007 -- Lower White. Colorado, Utah.
                                      Area =     2670 sq.mi.


  Subregion  1406 -- Lower Green: The Green River Basin below the
                     confluence with the Yampa River Basin, but excluding
                     the Yampa and White River Basins. Colorado, Utah.
                       Area =    14400 sq.mi.

    Accounting Unit 140600 -- Lower Green. Colorado, Utah.
                                Area =    14400 sq.mi.

      Cataloging Units  14060001 -- Lower Green-Diamond. Colorado, Utah.
                                      Area =      961 sq.mi.
                        14060002 -- Ashley-Brush. Utah.
                                      Area =      637 sq.mi.
                        14060003 -- Duchesne. Utah.
                                      Area =     2640 sq.mi.
                        14060004 -- Strawberry. Utah.
                                      Area =     1150 sq.mi.
                        14060005 -- Lower Green-Desolation Canyon. Utah.
                                      Area =     1910 sq.mi.
                        14060006 -- Willow. Utah.
                                      Area =      957 sq.mi.
                        14060007 -- Price. Utah.
                                      Area =     1870 sq.mi.
                        14060008 -- Lower Green. Utah.
                                      Area =     1840 sq.mi.
                        14060009 -- San Rafael. Utah.
                                      Area =     2390 sq.mi.


  Subregion  1407 -- Upper Colorado-Dirty Devil: The Colorado River
                     Basin below the confluence with the Green River
                     Basin to the Lee Ferry compact point, but excluding
                     the San Juan River Basin. Arizona, Utah.
                       Area =    13500 sq.mi.

    Accounting Unit 140700 -- Upper Colorado-Dirty Devil. Arizona, Utah.
                                Area =    13500 sq.mi.

      Cataloging Units  14070001 -- Upper Lake Powell. Utah.
                                      Area =     2820 sq.mi.
                        14070002 -- Muddy. Utah.
                                      Area =     1530 sq.mi.
                        14070003 -- Fremont. Utah.
                                      Area =     1940 sq.mi.
                        14070004 -- Dirty Devil. Utah.
                                      Area =      839 sq.mi.
                        14070005 -- Escalante. Utah.
                                      Area =     2000 sq.mi.
                        14070006 -- Lower Lake Powell. Arizona, Utah.
                                      Area =     2930 sq.mi.
                        14070007 -- Paria. Arizona, Utah.
                                      Area =     1420 sq.mi.


  Subregion  1408 -- San Juan: The San Juan River Basin. Arizona,
                     Colorado, New Mexico, Utah.
                       Area =    24600 sq.mi.

    Accounting Unit 140801 -- Upper San Juan: The San Juan River Basin to
                              and including the Mancos River Basin.
                              Arizona, Colorado, New Mexico.
                                Area =    14400 sq.mi.

      Cataloging Units  14080101 -- Upper San Juan. Colorado,
                                    New Mexico.
                                      Area =     3430 sq.mi.
                        14080102 -- Piedra. Colorado.
                                      Area =      662 sq.mi.
                        14080103 -- Blanco Canyon. New Mexico.
                                      Area =     1690 sq.mi.
                        14080104 -- Animas. Colorado, New Mexico.
                                      Area =     1370 sq.mi.
                        14080105 -- Middle San Juan. Arizona, Colorado,
                                    New Mexico.
                                      Area =     1920 sq.mi.
                        14080106 -- Chaco. Arizona, New Mexico.
                                      Area =     4510 sq.mi.
                        14080107 -- Mancos. Colorado, New Mexico.
                                      Area =      795 sq.mi.

    Accounting Unit 140802 -- Lower San Juan: The San Juan River Basin
                              below the Mancos River Basin to
                              the confluence with the Colorado River.
                              Arizona, Colorado, New Mexico, Utah.
                                Area =    10300 sq.mi.

      Cataloging Units  14080201 -- Lower San Juan-Four Corners.
                                    Arizona, Colorado, New Mexico, Utah.
                                      Area =     2000 sq.mi.
                        14080202 -- Mcelmo. Colorado, Utah.
                                      Area =      702 sq.mi.
                        14080203 -- Montezuma. Colorado, Utah.
                                      Area =     1160 sq.mi.
                        14080204 -- Chinle. Arizona, New Mexico, Utah.
                                      Area =     4090 sq.mi.
                        14080205 -- Lower San Juan. Arizona, Utah.
                                      Area =     2320 sq.mi.


Region 15  Lower Colorado Region--The drainage within the United States
           of: (a) the Colorado River Basin below the Lee Ferry compact
           point which is one mile below the mouth of the Paria River;
           (b) streams that originate within the United States and
           ultimately discharge into the Gulf of California; and
           (c) the Animas Valley, Willcox Playa, and other smaller closed
           basins. Includes parts of Arizona, California,
           Nevada, New Mexico, and Utah.


  Subregion  1501 -- Lower Colorado-Lake Mead: The Colorado River Basin
                     from the Lee Ferry compact point to Hoover Dam,
                     but excluding the Little Colorado River Basin.
                     Arizona, Nevada, Utah.
                       Area =    29900 sq.mi.

    Accounting Unit 150100 -- Lower Colorado-Lake Mead: Arizona,
                              Nevada, Utah.
                                Area =    29900 sq.mi.

      Cataloging Units  15010001 -- Lower Colorado-Marble Canyon.
                                    Arizona.
                                      Area =     1430 sq.mi.
                        15010002 -- Grand Canyon. Arizona.
                                      Area =     2530 sq.mi.
                        15010003 -- Kanab. Arizona, Utah.
                                      Area =     2350 sq.mi.
                        15010004 -- Havasu Canyon. Arizona.
                                      Area =     2920 sq.mi.
                        15010005 -- Lake Mead. Arizona, Nevada.
                                      Area =     2710 sq.mi.
                        15010006 -- Grand Wash. Arizona, Nevada.
                                      Area =      922 sq.mi.
                        15010007 -- Hualapai Wash. Arizona.
                                      Area =     1540 sq.mi.
                        15010008 -- Upper Virgin. Utah.
                                      Area =     2130 sq.mi.
                        15010009 -- Fort Pierce Wash. Arizona, Utah.
                                      Area =     1690 sq.mi.
                        15010010 -- Lower Virgin. Arizona, Nevada, Utah.
                                      Area =     2070 sq.mi.
                        15010011 -- White. Nevada.
                                      Area =     2840 sq.mi.
                        15010012 -- Muddy. Nevada.
                                      Area =     1750 sq.mi.
                        15010013 -- Meadow Valley Wash. Nevada, Utah.
                                      Area =     2540 sq.mi.
                        15010014 -- Detrital Wash. Arizona.
                                      Area =      650 sq.mi.
                        15010015 -- Las Vegas Wash. Nevada.
                                      Area =     1860 sq.mi.


  Subregion  1502 -- Little Colorado: The Little Colorado River Basin.
                     Arizona, New Mexico.
                       Area =    26900 sq.mi.

    Accounting Unit 150200 -- Little Colorado. Arizona, New Mexico.
                                Area =    26900 sq.mi.

      Cataloging Units  15020001 -- Little Colorado headwaters. Arizona,
                                    New Mexico.
                                      Area =      783 sq.mi.
                        15020002 -- Upper Little Colorado. Arizona,
                                    New Mexico.
                                      Area =     1590 sq.mi.
                        15020003 -- Carrizo Wash. Arizona, New Mexico.
                                      Area =     2210 sq.mi.
                        15020004 -- Zuni. Arizona, New Mexico.
                                      Area =     2730 sq.mi.
                        15020005 -- Silver. Arizona.
                                      Area =      934 sq.mi.
                        15020006 -- Upper Puerco. Arizona, New Mexico.
                                      Area =     1890 sq.mi.
                        15020007 -- Lower Puerco. Arizona.
                                      Area =     1100 sq.mi.
                        15020008 -- Middle Little Colorado. Arizona.
                                      Area =     2450 sq.mi.
                        15020009 -- Leroux Wash. Arizona.
                                      Area =      801 sq.mi.
                        15020010 -- Chevelon Canyon. Arizona.
                                      Area =      839 sq.mi.
                        15020011 -- Cottonwood Wash. Arizona.
                                      Area =     1610 sq.mi.
                        15020012 -- Corn-Oraibi. Arizona.
                                      Area =      864 sq.mi.
                        15020013 -- Polacca Wash. Arizona.
                                      Area =     1070 sq.mi.
                        15020014 -- Jadito Wash. Arizona.
                                      Area =     1050 sq.mi.
                        15020015 -- Canyon Diablo. Arizona.
                                      Area =     1200 sq.mi.
                        15020016 -- Lower Little Colorado. Arizona.
                                      Area =     2390 sq.mi.
                        15020017 -- Dinnebito Wash. Arizona.
                                      Area =      737 sq.mi.
                        15020018 -- Moenkopi Wash. Arizona.
                                      Area =     2640 sq.mi.


  Subregion  1503 -- Lower Colorado: The Colorado River Basin within
                     the United States below Hoover Dam, excluding the
                     Gila River Basin. Arizona, California, Nevada.
                       Area =    17000 sq.mi.

    Accounting Unit 150301 -- Lower Colorado: The Colorado River Basin
                              within the United States below Hoover Dam,
                              excluding the Gila and Bill Williams
                              River Basins. Arizona, California,
                              Nevada.
                                Area =    11600 sq.mi.

      Cataloging Units  15030101 -- Havasu-Mohave Lakes. Arizona,
                                    California, Nevada.
                                      Area =     2740 sq.mi.
                        15030102 -- Piute Wash. California, Nevada.
                                      Area =     1030 sq.mi.
                        15030103 -- Sacramento Wash. Arizona.
                                      Area =     1290 sq.mi.
                        15030104 -- Imperial Reservoir. Arizona,
                                    California.
                                      Area =     3320 sq.mi.
                        15030105 -- Bouse Wash. Arizona.
                                      Area =     1630 sq.mi.
                        15030106 -- Tyson Wash. Arizona.
                                      Area =      717 sq.mi.
                        15030107 -- Lower Colorado. Arizona, California.
                                      Area =      267 sq.mi.
                        15030108 -- Yuma Desert. Arizona.
                                      Area =      626 sq.mi.

    Accounting Unit 150302 -- Bill Williams: The Bill Williams River
                              Basin. Arizona.
                                Area =     5370 sq.mi.

      Cataloging Units  15030201 -- Big Sandy. Arizona.
                                      Area =     2120 sq.mi.
                        15030202 -- Burro. Arizona.
                                      Area =      708 sq.mi.
                        15030203 -- Santa Maria. Arizona.
                                      Area =     1440 sq.mi.
                        15030204 -- Bill Williams. Arizona.
                                      Area =     1100 sq.mi.


  Subregion  1504 -- Upper Gila: The Gila River Basin above Coolidge
                     Dam, including the Animas Valley closed basin.
                     Arizona, New Mexico.
                       Area =    15100 sq.mi.

    Accounting Unit 150400 -- Upper Gila. Arizona, New Mexico.
                                Area =    15100 sq.mi.

      Cataloging Units  15040001 -- Upper Gila. New Mexico.
                                      Area =     2000 sq.mi.
                        15040002 -- Upper Gila-Mangas. Arizona,
                                    New Mexico.
                                      Area =     2030 sq.mi.
                        15040003 -- Animas Valley. Arizona, New Mexico.
                                      Area =     2250 sq.mi.
                        15040004 -- San Francisco. Arizona, New Mexico.
                                      Area =     2740 sq.mi.
                        15040005 -- Upper Gila-San Carlos Reservoir.
                                    Arizona.
                                      Area =     2820 sq.mi.
                        15040006 -- San Simon. Arizona, New Mexico.
                                      Area =     2230 sq.mi.
                        15040007 -- San Carlos. Arizona.
                                      Area =     1070 sq.mi.


  Subregion  1505 -- Middle Gila: The Gila River Basin within
                     the United States from Coolidge Dam to the
                     confluence with the Salt River Basin, including
                     the Willcox closed basin. Arizona.
                       Area =    16900 sq.mi.

    Accounting Unit 150501 -- Middle Gila: The Gila River Basin
                              from Coolidge Dam to the confluence
                              with the Salt River Basin, excluding the
                              Santa Cruz and San Pedro River Basins and
                              the Willcox closed basin. Arizona.
                                Area =     3310 sq.mi.

      Cataloging Unit   15050100 -- Middle Gila. Arizona.
                                      Area =     3310 sq.mi.

    Accounting Unit 150502 -- San Pedro-Willcox: The San Pedro River
                              Basin within the United States and the
                              Willcox closed basin. Arizona.
                                Area =     5440 sq.mi.

      Cataloging Units  15050201 -- Willcox Playa. Arizona.
                                      Area =     1680 sq.mi.
                        15050202 -- Upper San Pedro. Arizona.
                                      Area =     1780 sq.mi.
                        15050203 -- Lower San Pedro. Arizona.
                                      Area =     1980 sq.mi.

    Accounting Unit 150503 -- Santa Cruz: The Santa Cruz River Basin
                              within the United States. Arizona.
                                Area =     8190 sq.mi.

      Cataloging Units  15050301 -- Upper Santa Cruz. Arizona.
                                      Area =     2210 sq.mi.
                        15050302 -- Rillito. Arizona.
                                      Area =      928 sq.mi.
                        15050303 -- Lower Santa Cruz. Arizona.
                                      Area =     1580 sq.mi.
                        15050304 -- Brawley Wash. Arizona.
                                      Area =     1390 sq.mi.
                        15050305 -- Aguirre Valley. Arizona.
                                      Area =      790 sq.mi.
                        15050306 -- Santa Rosa Wash. Arizona.
                                      Area =     1290 sq.mi.


  Subregion  1506 -- Salt: The Salt River Basin. Arizona.
                       Area =    13700 sq.mi.

    Accounting Unit 150601 -- Salt: The Salt River Basin, excluding the
                              Verde River Basin. Arizona.
                                Area =     7120 sq.mi.

      Cataloging Units  15060101 -- Black. Arizona.
                                      Area =     1240 sq.mi.
                        15060102 -- White. Arizona.
                                      Area =      656 sq.mi.
                        15060103 -- Upper Salt. Arizona.
                                      Area =     2160 sq.mi.
                        15060104 -- Carrizo. Arizona.
                                      Area =      695 sq.mi.
                        15060105 -- Tonto. Arizona.
                                      Area =     1030 sq.mi.
                        15060106 -- Lower Salt. Arizona.
                                      Area =     1340 sq.mi.

    Accounting Unit 150602 -- Verde: The Verde River Basin. Arizona.
                                Area =     6590 sq.mi.

      Cataloging Units  15060201 -- Big Chino-Williamson Valley.
                                    Arizona.
                                      Area =     2170 sq.mi.
                        15060202 -- Upper Verde. Arizona.
                                      Area =     2480 sq.mi.
                        15060203 -- Lower Verde. Arizona.
                                      Area =     1940 sq.mi.


  Subregion  1507 -- Lower Gila: The Gila River Basin below the
                     confluence with the Salt River Basin to the
                     confluence with the Colorado River. Arizona.
                       Area =    14800 sq.mi.

    Accounting Unit 150701 -- Lower Gila-Agua Fria: The Gila River Basin
                              below the confluence with the Salt River
                              Basin to Painted Rock Dam. Arizona.
                                Area =     7860 sq.mi.

      Cataloging Units  15070101 -- Lower Gila-Painted Rock Reservoir.
                                    Arizona.
                                      Area =     2090 sq.mi.
                        15070102 -- Agua Fria. Arizona.
                                      Area =     2420 sq.mi.
                        15070103 -- Hassayampa. Arizona.
                                      Area =     1410 sq.mi.
                        15070104 -- Centennial Wash. Arizona.
                                      Area =     1940 sq.mi.

    Accounting Unit 150702 -- Lower Gila: The Gila River Basin
                              below Painted Rock Dam. Arizona.
                                Area =     6960 sq.mi.

      Cataloging Units  15070201 -- Lower Gila. Arizona.
                                      Area =     4170 sq.mi.
                        15070202 -- Tenmile Wash. Arizona.
                                      Area =     1220 sq.mi.
                        15070203 -- San Cristobal Wash. Arizona.
                                      Area =     1570 sq.mi.


  Subregion  1508 -- Sonora: The drainage that originates within the
                     United States east of the Colorado River Basin and
                     ultimately discharges into the Gulf of California.
                     Arizona, New Mexico.
                       Area =     4830 sq.mi.

    Accounting Unit 150801 -- Rio Sonoyta: The drainage within the
                              United states of the Rio Sonoyta Basin.
                              Arizona.
                                Area =     2960 sq.mi.

      Cataloging Units  15080101 -- San Simon Wash. Arizona.
                                      Area =     2130 sq.mi.
                        15080102 -- Rio Sonoyta. Arizona.
                                      Area =      420 sq.mi.
                        15080103 -- Tule Desert. Arizona.
                                      Area =      412 sq.mi.

    Accounting Unit 150802 -- Rio De La Concepcion: The drainage within
                              the United states of the Rio De La
                              Concepcion Basin. Arizona.
                                Area =      125 sq.mi.

      Cataloging Unit   15080200 -- Rio De La Concepcion. Arizona.
                                      Area =      125 sq.mi.

    Accounting Unit 150803 -- Rio De Bavispe: The drainage within the
                              United states of the Rio De Bavispe
                              Basin. Arizona, New Mexico.
                                Area =     1740 sq.mi.

      Cataloging Units  15080301 -- Whitewater Draw. Arizona.
                                      Area =     1180 sq.mi.
                        15080302 -- San Bernardino Valley. Arizona,
                                    New Mexico.
                                      Area =      416 sq.mi.
                        15080303 -- Cloverdale. New Mexico.
                                      Area =      145 sq.mi.


Region 16  Great Basin Region -- The drainage of the Great Basin that
           discharges into the states of Utah and Nevada. Includes Parts
           of California, Idaho, Nevada, Oregon, Utah, and Wyoming.


  Subregion  1601 -- Bear: The Bear River Basin. Idaho, Utah, Wyoming.
                       Area =     7310 sq.mi.

    Accounting Unit 160101 -- Upper Bear: The Bear River Basin above
                              Stewart Dam. Idaho, Utah, Wyoming.
                                Area =     2800 sq.mi.

      Cataloging Units  16010101 -- Upper Bear. Utah, Wyoming.
                                      Area =     1970 sq.mi.
                        16010102 -- Central Bear. Idaho, Utah, Wyoming.
                                      Area =      834 sq.mi.

    Accounting Unit 160102 -- Lower Bear: The Bear River Basin below
                              Stewart Dam. Idaho, Utah.
                                Area =     4510 sq.mi.

      Cataloging Units  16010201 -- Bear Lake. Idaho, Utah.
                                      Area =     1220 sq.mi.
                        16010202 -- Middle Bear. Idaho, Utah.
                                      Area =     1210 sq.mi.
                        16010203 -- Little Bear-Logan. Idaho, Utah.
                                      Area =      928 sq.mi.
                        16010204 -- Lower Bear-Malad. Idaho, Utah.
                                      Area =     1150 sq.mi.


  Subregion  1602 -- Great Salt Lake: The Great Salt Lake Basin
                     excluding the Bear River Basin. Idaho, Nevada,
                     Utah, Wyoming.
                       Area =    28700 sq.mi.

    Accounting Unit 160201 -- Weber: The Weber River Basin. Utah,
                              Wyoming.
                                Area =     2430 sq.mi.

      Cataloging Units  16020101 -- Upper Weber. Utah, Wyoming.
                                      Area =     1170 sq.mi.
                        16020102 -- Lower Weber. Utah.
                                      Area =     1260 sq.mi.

    Accounting Unit 160202 -- Jordan: The Jordan River Basin. Utah.
                                Area =     3830 sq.mi.

      Cataloging Units  16020201 -- Utah Lake. Utah.
                                      Area =     1340 sq.mi.
                        16020202 -- Spanish Fork. Utah.
                                      Area =      993 sq.mi.
                        16020203 -- Provo. Utah.
                                      Area =      710 sq.mi.
                        16020204 -- Jordan. Utah.
                                      Area =      791 sq.mi.

    Accounting Unit 160203 -- Great Salt Lake: The Great Salt Lake
                              Basin, excluding the Bear, Weber,  and
                              Jordan River Basins. Idaho, Nevada,
                              Utah.
                                Area =    22400 sq.mi.

      Cataloging Units  16020301 -- Hamlin-Snake Valleys. Nevada, Utah.
                                      Area =     3100 sq.mi.
                        16020302 -- Pine Valley. Utah.
                                      Area =      732 sq.mi.
                        16020303 -- Tule Valley. Utah.
                                      Area =      928 sq.mi.
                        16020304 -- Rush-Tooele Valleys. Utah.
                                      Area =     1180 sq.mi.
                        16020305 -- Skull Valley. Utah.
                                      Area =      798 sq.mi.
                        16020306 -- Southern Great Salt Lake Desert.
                                    Nevada, Utah.
                                      Area =     5420 sq.mi.
                        16020307 -- Pilot-Thousand Springs, Nevada,
                                    Utah.
                                      Area =     1780 sq.mi.
                        16020308 -- Northern Great Salt Lake Desert.
                                    Nevada, Utah.
                                      Area =     4650 sq.mi.
                        16020309 -- Curlew Valley. Idaho, Utah.
                                      Area =     1930 sq.mi.
                        16020310 -- Great Salt Lake. Utah.
                                      Area =     1880 sq.mi.


  Subregion  1603 -- Escalante Desert-Sevier Lake: The Escalante Desert
                     and the Sevier Lake closed basins. Nevada, Utah.
                       Area =    16200 sq.mi.

    Accounting Unit 160300 -- Escalante Desert-Sevier Lake: Nevada,
                              Utah.
                                Area =    16200 sq.mi.

      Cataloging Units  16030001 -- Upper Sevier. Utah.
                                      Area =     1180 sq.mi.
                        16030002 -- East Fork Sevier. Utah.
                                      Area =     1250 sq.mi.
                        16030003 -- Middle Sevier. Utah.
                                      Area =     1850 sq.mi.
                        16030004 -- San Pitch. Utah.
                                      Area =      858 sq.mi.
                        16030005 -- Lower Sevier. Utah.
                                      Area =     3970 sq.mi.
                        16030006 -- Escalante Desert. Nevada,
                                    Utah.
                                      Area =     3270 sq.mi.
                        16030007 -- Beaver Bottoms-Upper Beaver. Utah.
                                      Area =     1720 sq.mi.
                        16030008 -- Lower Beaver. Utah.
                                      Area =      746 sq.mi.
                        16030009 -- Sevier Lake. Utah.
                                      Area =     1330 sq.mi.


  Subregion  1604 -- Black Rock Desert-Humboldt: The Humboldt River
                     Basin, the Black Rock Desert, and other closed
                     basins that discharge into
                     Northwestern Nevada. California, Nevada, Oregon.
                       Area =    28300 sq.mi.

    Accounting Unit 160401 -- Humboldt: The Humboldt River Basin.
                              Nevada.
                                Area =    16700 sq.mi.

      Cataloging Units  16040101 -- Upper Humboldt. Nevada.
                                      Area =     2720 sq.mi.
                        16040102 -- North Fork Humboldt. Nevada.
                                      Area =      988 sq.mi.
                        16040103 -- South Fork Humboldt. Nevada.
                                      Area =     1270 sq.mi.
                        16040104 -- Pine. Nevada.
                                      Area =      985 sq.mi.
                        16040105 -- Middle Humboldt. Nevada.
                                      Area =     3180 sq.mi.
                        16040106 -- Rock. Nevada.
                                      Area =      888 sq.mi.
                        16040107 -- Reese. Nevada.
                                      Area =     2310 sq.mi.
                        16040108 -- Lower Humboldt. Nevada.
                                      Area =     2590 sq.mi.
                        16040109 -- Little Humboldt. Nevada.
                                      Area =     1740 sq.mi.

    Accounting Unit 160402 -- Black Rock Desert: The Black Rock Desert
                              and other closed basins that
                              discharge into Northwestern Nevada.
                              California, Nevada, Oregon.
                                Area =    11600 sq.mi.

      Cataloging Units  16040201 -- Upper Quinn. Nevada, Oregon.
                                      Area =     3480 sq.mi.
                        16040202 -- Lower Quinn. Nevada.
                                      Area =     3230 sq.mi.
                        16040203 -- Smoke Creek Desert. California,
                                    Nevada.
                                      Area =     2430 sq.mi.
                        16040204 -- Massacre Lake. California, Nevada,
                                      Area =     1300 sq.mi.
                        16040205 -- Thousand-Virgin. Nevada, Oregon.
                                      Area =     1150 sq.mi.


  Subregion  1605 -- Central Lahontan: The Central Lahontan Basin
                     Consisting of the Carson, Truckee, and Walker River
                     Basins. California, Nevada.
                       Area =    12500 sq.mi.

    Accounting Unit 160501 -- Truckee: The Truckee River Basin.
                              California, Nevada.
                                Area =     4710 sq.mi.

      Cataloging Units  16050101 -- Lake Tahoe. California, Nevada.
                                      Area =      505 sq.mi.
                        16050102 -- Truckee. California, Nevada.
                                      Area =     1190 sq.mi.
                        16050103 -- Pyramid-Winnemucca Lakes. Nevada.
                                      Area =     1370 sq.mi.
                        16050104 -- Granite Springs Valley. Nevada.
                                      Area =     1640 sq.mi.

    Accounting Unit 160502 -- Carson: The Carson River Basin.
                              California, Nevada.
                                Area =     3930 sq.mi.

      Cataloging Units  16050201 -- Upper Carson. California, Nevada.
                                      Area =      934 sq.mi.
                        16050202 -- Middle Carson. Nevada.
                                      Area =      843 sq.mi.
                        16050203 -- Carson Desert. Nevada.
                                      Area =     2150 sq.mi.

    Accounting Unit 160503 -- Walker: The Walker River Basin.
                              California, Nevada.
                                Area =     3920 sq.mi.

      Cataloging Units  16050301 -- East Walker. California, Nevada.
                                      Area =     1080 sq.mi.
                        16050302 -- West Walker. California, Nevada.
                                      Area =      992 sq.mi.
                        16050303 -- Walker. Nevada.
                                      Area =     1010 sq.mi.
                        16050304 -- Walker Lake. Nevada.
                                      Area =      835 sq.mi.


  Subregion  1606 -- Central Nevada Desert Basins: The Closed Desert
                     Basins that discharge into South Central Nevada.
                     California, Nevada.
                       Area =    47100 sq.mi.

    Accounting Unit 160600 -- Central Nevada Desert Basins: California,
                              Nevada.
                                Area =    47100 sq.mi.

      Cataloging Units  16060001 -- Dixie Valley. Nevada.
                                      Area =     3990 sq.mi.
                        16060002 -- Gabbs Valley. Nevada.
                                      Area =     2060 sq.mi.
                        16060003 -- Southern Big Smoky Valley. Nevada.
                                      Area =     2030 sq.mi.
                        16060004 -- Northern Big Smoky Valley. Nevada.
                                      Area =     1890 sq.mi.
                        16060005 -- Diamond-Monitor Valleys. Nevada.
                                      Area =     3070 sq.mi.
                        16060006 -- Little Smoky-Newark Valleys. Nevada.
                                      Area =     1430 sq.mi.
                        16060007 -- Long-Ruby Valleys. Nevada.
                                      Area =     4060 sq.mi.
                        16060008 -- Spring-Steptoe Valleys. Nevada.
                                      Area =     5240 sq.mi.
                        16060009 -- Dry Lake Valley. Nevada.
                                      Area =     2160 sq.mi.
                        16060010 -- Fish Lake-Soda Spring Valleys.
                                    California, Nevada.
                                      Area =     2720 sq.mi.
                        16060011 -- Ralston-Stone Cabin Valleys. Nevada.
                                      Area =     3190 sq.mi.
                        16060012 -- Hot Creek-Railroad Valleys. Nevada.
                                      Area =     4660 sq.mi.
                        16060013 -- Cactus-Sarcobatus Flats. Nevada.
                                      Area =     2720 sq.mi.
                        16060014 -- Sand Spring-Tikaboo Valleys. Nevada.
                                      Area =     5070 sq.mi.
                        16060015 -- Ivanpah-Pahrump Valleys. California,
                                    Nevada.
                                      Area =     2830 sq.mi.


Region 17  Pacific Northwest Region -- The drainage within the United
           States that ultimately discharges into: (a) the Straits of
           Georgia and of Juan De Fuca, and (b) the Pacific Ocean within
           the states of Oregon and Washington; and that part of the
           Great Basin whose discharge is into the state of Oregon.
           Includes all of Washington and parts of California,
           Idaho, Montana, Nevada, Oregon, Utah, and Wyoming.


  Subregion  1701 -- Kootenai-Pend Oreille-Spokane: The Kootenai, Pend
                     Oreille, and Spokane River Basins within the United
                     States. Idaho, Montana, and Washington.
                       Area =    36600 sq.mi.

    Accounting Unit 170101 -- Kootenai: The Kootenai River Basin within
                              the United States. Idaho, Montana.
                                Area =     4850 sq.mi.

      Cataloging Units  17010101 -- Upper Kootenai. Idaho, Montana.
                                      Area =     2290 sq.mi.
                        17010102 -- Fisher. Montana.
                                      Area =      843 sq.mi.
                        17010103 -- Yaak. Montana.
                                      Area =      630 sq.mi.
                        17010104 -- Lower Kootenai. Idaho, Montana.
                                      Area =      887 sq.mi.
                        17010105 -- Moyie. Idaho, Montana.
                                      Area =      203 sq.mi.

    Accounting Unit 170102 -- Pend Oreille: The Pend Oreille River Basin
                              within the United States. Idaho, Montana,
                              and Washington.
                                Area =    25100 sq.mi.

      Cataloging Units  17010201 -- Upper Clark Fork. Montana.
                                      Area =     2320 sq.mi.
                        17010202 -- Flint-Rock. Montana.
                                      Area =     1400 sq.mi.
                        17010203 -- Blackfoot. Montana.
                                      Area =     2340 sq.mi.
                        17010204 -- Middle Clark Fork. Montana.
                                      Area =     1970 sq.mi.
                        17010205 -- Bitterroot. Montana.
                                      Area =     2860 sq.mi.
                        17010206 -- North Fork Flathead. Montana.
                                      Area =      967 sq.mi.
                        17010207 -- Middle Fork Flathead. Montana.
                                      Area =     1160 sq.mi.
                        17010208 -- Flathead Lake. Montana.
                                      Area =     1160 sq.mi.
                        17010209 -- South Fork Flathead. Montana.
                                      Area =     1690 sq.mi.
                        17010210 -- Stillwater. Montana.
                                      Area =      830 sq.mi.
                        17010211 -- Swan. Montana.
                                      Area =      748 sq.mi.
                        17010212 -- Lower Flathead. Montana.
                                      Area =     2010 sq.mi.
                        17010213 -- Lower Clark Fork. Idaho, Montana.
                                      Area =     2330 sq.mi.
                        17010214 -- Pend Oreille Lake. Idaho, Washington.
                                      Area =     1240 sq.mi.
                        17010215 -- Priest. Idaho, Washington.
                                      Area =      983 sq.mi.
                        17010216 -- Pend Oreille. Idaho, Washington.
                                      Area =     1080 sq.mi.

    Accounting Unit 170103 -- Spokane: The Spokane River Basin. Idaho,
                              Washington.
                                Area =     6680 sq.mi.

      Cataloging Units  17010301 -- Upper Coeur d'Alene. Idaho
                                      Area =      905 sq.mi.
                        17010302 -- South Fork Coeur d'Alene. Idaho.
                                      Area =      297 sq.mi.
                        17010303 -- Coeur d'Alene Lake. Idaho,
                                    Washington.
                                      Area =      663 sq.mi.
                        17010304 -- St. Joe. Idaho.
                                      Area =     1860 sq.mi.
                        17010305 -- Upper Spokane. Idaho, Washington.
                                      Area =      609 sq.mi.
                        17010306 -- Hangman. Idaho, Washington.
                                      Area =      714 sq.mi.
                        17010307 -- Lower Spokane. Washington.
                                      Area =      904 sq.mi.
                        17010308 -- Little Spokane. Idaho, Washington.
                                      Area =      723 sq.mi.


  Subregion  1702 -- Upper Columbia: The Columbia River Basin within the
                     the United States above the confluence with the
                     Snake River Basin, excluding the Yakima River
                     Basin. Washington.
                       Area =    22600 sq.mi.

    Accounting Unit 170200 -- Upper Columbia. Washington.
                                Area =    22600 sq.mi.

      Cataloging Units  17020001 -- Franklin D. Roosevelt Lake.
                                    Washington.
                                      Area =     2170 sq.mi.
                        17020002 -- Kettle. Washington.
                                      Area =      966 sq.mi.
                        17020003 -- Colville. Washington.
                                      Area =     1030 sq.mi.
                        17020004 -- Sanpoil. Washington.
                                      Area =     1080 sq.mi.
                        17020005 -- Chief Joseph. Washington.
                                      Area =     1390 sq.mi.
                        17020006 -- Okanogan. Washington.
                                      Area =     1640 sq.mi.
                        17020007 -- Similkameen. Washington.
                                      Area =      671 sq.mi.
                        17020008 -- Methow. Washington.
                                      Area =     1820 sq.mi.
                        17020009 -- Lake Chelan. Washington.
                                      Area =      955 sq.mi.
                        17020010 -- Upper Columbia-Entiat. Washington.
                                      Area =     1520 sq.mi.
                        17020011 -- Wenatchee. Washington.
                                      Area =     1350 sq.mi.
                        17020012 -- Moses Coulee. Washington.
                                      Area =      926 sq.mi.
                        17020013 -- Upper Crab. Washington.
                                      Area =     1860 sq.mi.
                        17020014 -- Banks Lake. Washington.
                                      Area =      609 sq.mi.
                        17020015 -- Lower Crab. Washington.
                                      Area =     2510 sq.mi.
                        17020016 -- Upper Columbia-Priest Rapids.
                                    Washington.
                                      Area =     2070 sq.mi.


  Subregion  1703 -- Yakima. The Yakima River Basin. Washington.
                       Area =     6210 sq.mi.

    Accounting Unit 170300 -- Yakima. Washington.
                                Area =     6210 sq.mi.

      Cataloging Units  17030001 -- Upper Yakima. Washington.
                                      Area =     2130 sq.mi.
                        17030002 -- Naches. Washington.
                                      Area =     1130 sq.mi.
                        17030003 -- Lower Yakima, Washington.
                                      Area =     2950 sq.mi.


  Subregion  1704 -- Upper Snake: The Snake River Basin to and
                     including the Clover Creek Basin.
                     Idaho, Nevada, Utah, Wyoming.
                       Area =    35600 sq.mi.

    Accounting Unit 170401 -- Snake headwaters: The Snake River Basin
                              above Kelly Mountain. Idaho, Wyoming.
                                Area =     5690 sq.mi.

      Cataloging Units  17040101 -- Snake headwaters. Wyoming.
                                      Area =     1680 sq.mi.
                        17040102 -- Gros Ventre. Wyoming.
                                      Area =      638 sq.mi.
                        17040103 -- Greys-Hobock. Wyoming.
                                      Area =     1570 sq.mi.
                        17040104 -- Palisades. Idaho, Wyoming.
                                      Area =      915 sq.mi.
                        17040105 -- Salt. Idaho, Wyoming.
                                      Area =      887 sq.mi.

    Accounting Unit 170402 -- Upper Snake: The Snake River Basin from
                              Kelly Mountain to and including the
                              Clover Creek Basin. Idaho, Nevada,
                              Utah, Wyoming.
                                Area =    29900 sq.mi.

      Cataloging Units  17040201 -- Idaho Falls. Idaho.
                                      Area =     1140 sq.mi.
                        17040202 -- Upper Henrys. Idaho, Wyoming.
                                      Area =     1090 sq.mi.
                        17040203 -- Lower Henrys. Idaho, Wyoming.
                                      Area =     1040 sq.mi.
                        17040204 -- Teton. Idaho, Wyoming.
                                      Area =     1130 sq.mi.
                        17040205 -- Willow. Idaho.
                                      Area =      645 sq.mi.
                        17040206 -- American Falls. Idaho.
                                      Area =     2850 sq.mi.
                        17040207 -- Blackfoot. Idaho.
                                      Area =     1080 sq.mi.
                        17040208 -- Portneuf. Idaho.
                                      Area =     1320 sq.mi.
                        17040209 -- Lake Walcott. Idaho.
                                      Area =     3670 sq.mi.
                        17040210 -- Raft. Idaho, Utah.
                                      Area =     1470 sq.mi.
                        17040211 -- Goose. Idaho, Nevada, Utah.
                                      Area =     1150 sq.mi.
                        17040212 -- Upper Snake-Rock. Idaho.
                                      Area =     2440 sq.mi.
                        17040213 -- Salmon Falls. Idaho, Nevada.
                                      Area =     2120 sq.mi.
                        17040214 -- Beaver-Camas. Idaho.
                                      Area =      982 sq.mi.
                        17040215 -- Medicine Lodge. Idaho.
                                      Area =      952 sq.mi.
                        17040216 -- Birch. Idaho.
                                      Area =      692 sq.mi.
                        17040217 -- Little Lost. Idaho.
                                      Area =      957 sq.mi.
                        17040218 -- Big Lost. Idaho.
                                      Area =     1900 sq.mi.
                        17040219 -- Big Wood. Idaho.
                                      Area =     1460 sq.mi.
                        17040220 -- Camas. Idaho.
                                      Area =      672 sq.mi.
                        17040221 -- Little Wood. Idaho.
                                      Area =     1120 sq.mi.


  Subregion  1705 -- Middle Snake: The Snake River Basin below the Clover
                     Creek Basin to Hells Canyon Dam. Idaho,
                     Nevada, Oregon.
                       Area =    36700 sq.mi.

    Accounting Unit 170501 -- Middle Snake-Boise: The Snake River Basin
                              below the Clover Creek Basin to and
                              including the Weiser River Basin.
                              Idaho, Nevada, Oregon.
                                Area =    32600 sq.mi.

      Cataloging Units  17050101 -- C. J. Strike Reservoir. Idaho.
                                      Area =     2150 sq.mi.
                        17050102 -- Bruneau. Idaho, Nevada.
                                      Area =     3290 sq.mi.
                        17050103 -- Middle Snake-Succor. Idaho, Oregon.
                                      Area =     2280 sq.mi.
                        17050104 -- Upper Owyhee. Idaho, Nevada.
                                      Area =     2110 sq.mi.
                        17050105 -- South Fork Owyhee. Idaho, Nevada,
                                    Oregon.
                                      Area =     1860 sq.mi.
                        17050106 -- East Little Owyhee. Idaho. Nevada,
                                    Oregon.
                                      Area =      910 sq.mi.
                        17050107 -- Middle Owyhee. Idaho, Nevada,
                                    Oregon.
                                      Area =     1460 sq.mi.
                        17050108 -- Jordan. Idaho, Oregon.
                                      Area =     1270 sq.mi.
                        17050109 -- Crooked-Rattlesnake. Oregon.
                                      Area =     1340 sq.mi.
                        17050110 -- Lower Owyhee. Oregon.
                                      Area =     2000 sq.mi.
                        17050111 -- North and Middle Forks Boise. Idaho.
                                      Area =      761 sq.mi.
                        17050112 -- Boise-Mores. Idaho.
                                      Area =      620 sq.mi.
                        17050113 -- South Fork Boise. Idaho.
                                      Area =     1300 sq.mi.
                        17050114 -- Lower Boise. Idaho.
                                      Area =     1330 sq.mi.
                        17050115 -- Middle Snake-Payette. Idaho,
                                    Oregon.
                                      Area =      294 sq.mi.
                        17050116 -- Upper Malheur. Oregon.
                                      Area =     2430 sq.mi.
                        17050117 -- Lower Malheur. Oregon.
                                      Area =      927 sq.mi.
                        17050118 -- Bully. Oregon.
                                      Area =      577 sq.mi.
                        17050119 -- Willow. Oregon.
                                      Area =      773 sq.mi.
                        17050120 -- South Fork Payette. Idaho.
                                      Area =      813 sq.mi.
                        17050121 -- Middle Fork Payette. Idaho.
                                      Area =      338 sq.mi.
                        17050122 -- Payette. Idaho.
                                      Area =     1240 sq.mi.
                        17050123 -- North Fork Payette. Idaho.
                                      Area =      912 sq.mi.
                        17050124 -- Weiser. Idaho.
                                      Area =     1660 sq.mi.

    Accounting Unit 170502 -- Middle Snake-Powder: The Snake River Basin
                              below the Weiser River Basin
                              to Hells Canyon Dam. Idaho, Oregon.
                                Area =     4100 sq.mi.

      Cataloging Units  17050201 -- Brownlee Reservoir. Idaho, Oregon.
                                      Area =     1290 sq.mi.
                        17050202 -- Burnt. Oregon.
                                      Area =     1090 sq.mi.
                        17050203 -- Powder. Oregon.
                                      Area =     1720 sq.mi.


  Subregion  1706 -- Lower Snake: The Snake River Basin below Hells
                     Canyon Dam to its confluence with the Columbia
                     River. Idaho, Oregon, Washington.
                       Area =    35200 sq.mi.

    Accounting Unit 170601 -- Lower Snake: The Snake River Basin below
                              Hells Canyon Dam to its confluence with
                              the Columbia River, excluding the Salmon
                              and Clearwater River Basins. Idaho,
                              Oregon, Washington.
                                Area =    11800 sq.mi.

      Cataloging Units  17060101 -- Hells Canyon. Idaho, Oregon.
                                      Area =      545 sq.mi.
                        17060102 -- Imnaha. Oregon.
                                      Area =      855 sq.mi.
                        17060103 -- Lower Snake-Asotin. Idaho, Oregon,
                                    Washington.
                                      Area =      711 sq.mi.
                        17060104 -- Upper Grande Ronde. Oregon.
                                      Area =     1650 sq.mi.
                        17060105 -- Wallowa. Oregon.
                                      Area =      950 sq.mi.
                        17060106 -- Lower Grande Ronde. Oregon,
                                    Washington.
                                      Area =     1530 sq.mi.
                        17060107 -- Lower Snake-Tucannon. Washington.
                                      Area =     1480 sq.mi.
                        17060108 -- Palouse. Idaho, Washington.
                                      Area =     2360 sq.mi.
                        17060109 -- Rock. Idaho, Washington.
                                      Area =      962 sq.mi.
                        17060110 -- Lower Snake. Washington.
                                      Area =      731 sq.mi.

    Accounting Unit 170602 -- Salmon: The Salmon River Basin. Idaho.
                                Area =    14000 sq.mi.

      Cataloging Units  17060201 -- Upper Salmon. Idaho.
                                      Area =     2410 sq.mi.
                        17060202 -- Pahsimeroi. Idaho.
                                      Area =      825 sq.mi.
                        17060203 -- Middle Salmon-Panther. Idaho.
                                      Area =     1810 sq.mi.
                        17060204 -- Lemhi. Idaho.
                                      Area =     1270 sq.mi.
                        17060205 -- Upper Middle Fork Salmon. Idaho.
                                      Area =     1490 sq.mi.
                        17060206 -- Lower Middle Fork Salmon. Idaho.
                                      Area =     1370 sq.mi.
                        17060207 -- Middle Salmon-Chamberlain. Idaho.
                                      Area =     1700 sq.mi.
                        17060208 -- South Fork Salmon. Idaho.
                                      Area =     1310 sq.mi.
                        17060209 -- Lower Salmon. Idaho.
                                      Area =     1240 sq.mi.
                        17060210 -- Little Salmon. Idaho.
                                      Area =      582 sq.mi.

    Accounting Unit 170603 -- Clearwater: The Clearwater River Basin.
                              Idaho, Washington.
                                Area =     9420 sq.mi.

      Cataloging Units  17060301 -- Upper Selway. Idaho.
                                      Area =      997 sq.mi.
                        17060302 -- Lower Selway. Idaho.
                                      Area =     1030 sq.mi.
                        17060303 -- Lochsa. Idaho.
                                      Area =     1180 sq.mi.
                        17060304 -- Middle Fork Clearwater. Idaho.
                                      Area =      213 sq.mi.
                        17060305 -- South Fork Clearwater. Idaho.
                                      Area =     1170 sq.mi.
                        17060306 -- Clearwater. Idaho, Washington.
                                      Area =     2340 sq.mi.
                        17060307 -- Upper North Fork Clearwater. Idaho.
                                      Area =     1320 sq.mi.
                        17060308 -- Lower North Fork Clearwater. Idaho.
                                      Area =     1170 sq.mi.


  Subregion  1707 -- Middle Columbia: The Columbia River Basin below the
                     confluence with the Snake River Basin to Bonneville
                     Dam. Oregon, Washington.
                       Area =    29800 sq.mi.

    Accounting Unit 170701 -- Middle Columbia: The Columbia River Basin
                              below the confluence with the Snake River
                              Basin to Bonneville Dam, excluding the
                              Deschutes and John Day River Basins.
                              Oregon, Washington.
                                Area =    11200 sq.mi.

      Cataloging Units  17070101 -- Middle Columbia-Lake Wallula.
                                    Oregon, Washington.
                                      Area =     2550 sq.mi.
                        17070102 -- Walla Walla. Oregon, Washington.
                                      Area =     1750 sq.mi.
                        17070103 -- Umatilla. Oregon.
                                      Area =     2540 sq.mi.
                        17070104 -- Willow. Oregon.
                                      Area =      881 sq.mi.
                        17070105 -- Middle Columbia-Hood. Oregon,
                                    Washington.
                                      Area =     2170 sq.mi.
                        17070106 -- Klickitat. Washington.
                                      Area =     1330 sq.mi.

    Accounting Unit 170702 -- John Day: The John Day River Basin.
                              Oregon.
                                Area =     7910 sq.mi.

      Cataloging Units  17070201 -- Upper John Day. Oregon.
                                      Area =     2130 sq.mi.
                        17070202 -- North Fork John Day. Oregon.
                                      Area =     1830 sq.mi.
                        17070203 -- Middle Fork John Day. Oregon.
                                      Area =      785 sq.mi.
                        17070204 -- Lower John Day. Oregon.
                                      Area =     3160 sq.mi.

    Accounting Unit 170703 -- Deschutes: The Deschutes River Basin.
                              Oregon.
                                Area =    10700 sq.mi.

      Cataloging Units  17070301 -- Upper Deschutes. Oregon.
                                      Area =     2140 sq.mi.
                        17070302 -- Little Deschutes. Oregon.
                                      Area =     1020 sq.mi.
                        17070303 -- Beaver-South Fork. Oregon.
                                      Area =     1530 sq.mi.
                        17070304 -- Upper Crooked. Oregon.
                                      Area =     1150 sq.mi.
                        17070305 -- Lower Crooked. Oregon.
                                      Area =     1840 sq.mi.
                        17070306 -- Lower Deschutes. Oregon.
                                      Area =     2300 sq.mi.
                        17070307 -- Trout. Oregon.
                                      Area =      695 sq.mi.


  Subregion  1708 -- Lower Columbia: The Columbia River Basin below
                     Bonneville Dam, excluding the Willamette River
                     Basin. Oregon, Washington.
                       Area =     6250 sq.mi.

    Accounting Unit 170800 -- Lower Columbia. Oregon, Washington.
                                Area =     6250 sq.mi.

      Cataloging Units  17080001 -- Lower Columbia-Sandy. Oregon,
                                    Washington.
                                      Area =     1110 sq.mi.
                        17080002 -- Lewis. Washington.
                                      Area =     1080 sq.mi.
                        17080003 -- Lower Columbia-Clatskanie. Oregon,
                                    Washington.
                                      Area =      896 sq.mi.
                        17080004 -- Upper Cowlitz. Washington.
                                      Area =     1030 sq.mi.
                        17080005 -- Lower Cowlitz. Washington.
                                      Area =     1460 sq.mi.
                        17080006 -- Lower Columbia. Oregon, Washington.
                                      Area =      672 sq.mi.


  Subregion  1709 -- Willamette: The Willamette River Basin. Oregon.
                       Area =    11400 sq.mi.

    Accounting Unit 170900 -- Willamette. Oregon.
                                Area =    11400 sq.mi.

      Cataloging Units  17090001 -- Middle Fork Willamette. Oregon.
                                      Area =     1350 sq.mi.
                        17090002 -- Coast Fork Willamette. Oregon.
                                      Area =      664 sq.mi.
                        17090003 -- Upper Willamette. Oregon.
                                      Area =     1830 sq.mi.
                        17090004 -- Mckenzie. Oregon.
                                      Area =     1360 sq.mi.
                        17090005 -- North Santiam. Oregon.
                                      Area =      771 sq.mi.
                        17090006 -- South Santiam. Oregon.
                                      Area =     1050 sq.mi.
                        17090007 -- Middle Willamette. Oregon.
                                      Area =      700 sq.mi.
                        17090008 -- Yamhill. Oregon.
                                      Area =      770 sq.mi.
                        17090009 -- Molalla-Pudding. Oregon.
                                      Area =      883 sq.mi.
                        17090010 -- Tualatin. Oregon.
                                      Area =      718 sq.mi.
                        17090011 -- Clackamas. Oregon.
                                      Area =      935 sq.mi.
                        17090012 -- Lower Willamette. Oregon.
                                      Area =      407 sq.mi.


  Subregion  1710 -- Oregon-Washington Coastal: The drainage into the
                     drainage boundary to the Smith River Basin boundary,
                     excluding the Columbia River Basin. California,
                     Oregon, Washington.
                       Area =    23200 sq.mi.

    Accounting Unit 171001 -- Washington Coastal: The drainage into the
                              Pacific Ocean from the Strait of Juan De
                              Fuca drainage boundary to the Columbia
                              River Basin boundary. Washington.
                                Area =    6240 sq.mi.

      Cataloging Units  17100101 -- Hoh-Quillayute. Washington.
                                      Area =     1230 sq.mi.
                        17100102 -- Queets-Quinault. Washington.
                                      Area =     1190 sq.mi.
                        17100103 -- Upper Chehalis. Washington.
                                      Area =     1310 sq.mi.
                        17100104 -- Lower Chehalis. Washington.
                                      Area =      838 sq.mi.
                        17100105 -- Grays Harbor. Washington.
                                      Area =      568 sq.mi.
                        17100106 -- Willapa Bay. Washington.
                                      Area =     1100 sq.mi.

    Accounting Unit 171002 -- Northern Oregon Coastal: The drainage into
                              the Pacific Ocean from the Columbia River
                              Basin boundary to the Umpqua River Basin
                              boundary. Oregon.
                                Area =     4310 sq.mi.

      Cataloging Units  17100201 -- Necanicum. Oregon.
                                      Area =      129 sq.mi.
                        17100202 -- Nehalem. Oregon.
                                      Area =      860 sq.mi.
                        17100203 -- Wilson-Trask-Nestucca. Oregon.
                                      Area =      973 sq.mi.
                        17100204 -- Siletz-Yaquina. Oregon.
                                      Area =      753 sq.mi.
                        17100205 -- Alsea. Oregon.
                                      Area =      697 sq.mi.
                        17100206 -- Siuslaw. Oregon.
                                      Area =      769 sq.mi.
                        17100207 -- Siltcoos. Oregon.
                                      Area =      129 sq.mi.

    Accounting Unit 171003 -- Southern Oregon Coastal: The drainage into
                              the Pacific Ocean from and including the
                              Umpqua River Basin to the Smith River
                              Basin boundary. California, Oregon.
                                Area =    12600 sq.mi.

      Cataloging Units  17100301 -- North Umpqua. Oregon.
                                      Area =     1350 sq.mi.
                        17100302 -- South Umpqua. Oregon.
                                      Area =     1790 sq.mi.
                        17100303 -- Umpqua. Oregon.
                                      Area =     1500 sq.mi.
                        17100304 -- Coos. Oregon.
                                      Area =      739 sq.mi.
                        17100305 -- Coquille. Oregon.
                                      Area =     1030 sq.mi.
                        17100306 -- Sixes. Oregon.
                                      Area =      467 sq.mi.
                        17100307 -- Upper Rogue. Oregon.
                                      Area =     1610 sq.mi.
                        17100308 -- Middle Rogue. Oregon.
                                      Area =      885 sq.mi.
                        17100309 -- Applegate. California, Oregon.
                                      Area =      759 sq.mi.
                        17100310 -- Lower Rogue. Oregon.
                                      Area =      898 sq.mi.
                        17100311 -- Illinois. California, Oregon.
                                      Area =      981 sq.mi.
                        17100312 -- Chetco. California, Oregon.
                                      Area =      630 sq.mi.


  Subregion  1711 -- Puget Sound: The drainage within the United States
                     that discharges into: (a) Puget Sound and the
                     Straits of Georgia and of Juan De Fuca; and (b) the
                     Fraser River Basin. Washington.
                       Area =    16800 sq.mi.

    Accounting Unit 171100 -- Puget Sound. Washington.
                                Area =    16800 sq.mi.

      Cataloging Units  17110001 -- Fraser. Washington.
                                      Area =      249 sq.mi.
                        17110002 -- Strait of Georgia. Washington.
                                      Area =      955 sq.mi.
                        17110003 -- San Juan Islands. Washington.
                                      Area =      626 sq.mi.
                        17110004 -- Nooksack. Washington.
                                      Area =      795 sq.mi.
                        17110005 -- Upper Skagit. Washington.
                                      Area =     1630 sq.mi.
                        17110006 -- Sauk. Washington.
                                      Area =      741 sq.mi.
                        17110007 -- Lower Skagit. Washington.
                                      Area =      447 sq.mi.
                        17110008 -- Stillaguamish. Washington.
                                      Area =      704 sq.mi.
                        17110009 -- Skykomish. Washington.
                                      Area =      853 sq.mi.
                        17110010 -- Snoqualmie. Washington.
                                      Area =      693 sq.mi.
                        17110011 -- Snohomish. Washington.
                                      Area =      278 sq.mi.
                        17110012 -- Lake Washington. Washington.
                                      Area =      619 sq.mi.
                        17110013 -- Duwamish. Washington.
                                      Area =      487 sq.mi.
                        17110014 -- Puyallup. Washington.
                                      Area =      996 sq.mi.
                        17110015 -- Nisqually. Washington.
                                      Area =      726 sq.mi.
                        17110016 -- Deschutes. Washington.
                                      Area =      168 sq.mi.
                        17110017 -- Skokomish. Washington.
                                      Area =      248 sq.mi.
                        17110018 -- Hood Canal. Washington.
                                      Area =      957 sq.mi.
                        17110019 -- Puget Sound. Washington.
                                      Area =     2550 sq.mi.
                        17110020 -- Dungeness-Elwha. Washington.
                                      Area =     1270 sq.mi.
                        17110021 -- Crescent-Hoko. Washington.
                                      Area =      774 sq.mi.


  Subregion  1712 -- Oregon closed basins: The drainage of the Great
                     Basin that discharges into the state
                     of Oregon. California, Nevada, Oregon.
                       Area =    17300 sq.mi.

    Accounting Unit 171200 -- Oregon closed basins. California,
                              Nevada, Oregon.
                                Area =    17300 sq.mi.

      Cataloging Units  17120001 -- Harney-Malheur Lakes. Oregon.
                                      Area =     1420 sq.mi.
                        17120002 -- Silvies. Oregon.
                                      Area =     1310 sq.mi.
                        17120003 -- Donner Und Blitzen. Oregon.
                                      Area =      765 sq.mi.
                        17120004 -- Silver. Oregon.
                                      Area =     1670 sq.mi.
                        17120005 -- Summer Lake. Oregon.
                                      Area =     4100 sq.mi.
                        17120006 -- Lake Abert. Oregon.
                                      Area =     1020 sq.mi.
                        17120007 -- Warner Lakes. California, Nevada,
                                    Oregon.
                                      Area =     1900 sq.mi.
                        17120008 -- Guano. Nevada, Oregon.
                                      Area =     2970 sq.mi.
                        17120009 -- Alvord Lake. Nevada, Oregon.
                                      Area =     2110 sq.mi.


Region 18  California Region -- (a) the drainage within the United States
           that ultimately discharges into the Pacific Ocean within
           the state of California; and (b) those parts of the Great Basin
           (or other closed basins) that discharge into the state of
           California. Includes parts of California, Nevada, and Oregon.


  Subregion  1801 -- Klamath-Northern California Coastal: The drainage
                     into the Pacific Ocean from and including the Smith
                     River Basin to and including the Stemple
                     Creek Basin. California, Oregon.
                       Area =    24800 sq.mi.

    Accounting Unit 180101 -- Northern California Coastal: The drainage
                              into the Pacific Ocean from and including
                              the Smith River Basin to and including
                              the Stemple Creek Basin, excluding the
                              Klamath River Basin. California, Oregon.
                                Area =     9230 sq.mi.

      Cataloging Units  18010101 -- Smith. California, Oregon.
                                      Area =      788 sq.mi.
                        18010102 -- Mad-Redwood. California.
                                      Area =     1130 sq.mi.
                        18010103 -- Upper Eel. California.
                                      Area =      697 sq.mi.
                        18010104 -- Middle Fork Eel. California.
                                      Area =      747 sq.mi.
                        18010105 -- Lower Eel. California.
                                      Area =     1510 sq.mi.
                        18010106 -- South Fork Eel. California.
                                      Area =      678 sq.mi.
                        18010107 -- Mattole. California.
                                      Area =      485 sq.mi.
                        18010108 -- Big-Navarro-Garcia. California.
                                      Area =     1230 sq.mi.
                        18010109 -- Gualala-Salmon. California.
                                      Area =      343 sq.mi.
                        18010110 -- Russian. California.
                                      Area =     1470 sq.mi.
                        18010111 -- Bodega Bay. California.
                                      Area =      147 sq.mi.

    Accounting Unit 180102 -- Klamath. The Klamath River Basin.
                              California, Oregon.
                                Area =    15500 sq.mi.

      Cataloging Units  18010201 -- Williamson. Oregon.
                                      Area =     1430 sq.mi.
                        18010202 -- Sprague. Oregon.
                                      Area =     1600 sq.mi.
                        18010203 -- Upper Klamath Lake. Oregon.
                                      Area =      738 sq.mi.
                        18010204 -- Lost. California, Oregon.
                                      Area =     2960 sq.mi.
                        18010205 -- Butte. California, Oregon.
                                      Area =      601 sq.mi.
                        18010206 -- Upper Klamath. California, Oregon.
                                      Area =     1400 sq.mi.
                        18010207 -- Shasta. California.
                                      Area =      791 sq.mi.
                        18010208 -- Scott. California.
                                      Area =      802 sq.mi.
                        18010209 -- Lower Klamath. California, Oregon.
                                      Area =     1520 sq.mi.
                        18010210 -- Salmon. California.
                                      Area =      748 sq.mi.
                        18010211 -- Trinity. California.
                                      Area =     2010 sq.mi.
                        18010212 -- South Fork Trinity. California.
                                      Area =      926 sq.mi.


  Subregion  1802 -- Sacramento: The Sacramento River Basin and drainage
                     into Goose Lake. California, Oregon.
                       Area =    27600 sq.mi.

    Accounting Unit 180200 -- Upper Sacramento: The Sacramento River
                              Basin to and including Shasta Lake and
                              drainage into Goose Lake. California,
                              Oregon.
                                Area =     7650 sq.mi.

      Cataloging Units  18020001 -- Goose Lake. California, Oregon.
                                      Area =     1080 sq.mi.
                        18020002 -- Upper Pit. California.
                                      Area =     2620 sq.mi.
                        18020003 -- Lower Pit. California.
                                      Area =     2690 sq.mi.
                        18020004 -- Mccloud. California.
                                      Area =      674 sq.mi.
                        18020005 -- Sacramento headwaters. California.
                                      Area =      587 sq.mi.

    Accounting Unit 180201 -- Lower Sacramento: The Sacramento River
                              Basin below Shasta Dam. California.
                                Area =    19900 sq.mi.

      Cataloging Units  18020101 -- Sacramento-Lower Cow-Lower Clear.
                                    California.
                                      Area =      419 sq.mi.
                        18020102 -- Lower Cottonwood. California.
                                      Area =      328 sq.mi.
                        18020103 -- Sacramento-Lower Thomes.
                                    California.
                                      Area =     1120 sq.mi.
                        18020104 -- Sacramento-Stone Corral. California.
                                      Area =     1850 sq.mi.
                        18020105 -- Lower Butte. California.
                                      Area =      593 sq.mi.
                        18020106 -- Lower Feather. California.
                                      Area =      681 sq.mi.
                        18020107 -- Lower Yuba. California.
                                      Area =       34 sq.mi.
                        18020108 -- Lower Bear. California.
                                      Area =      100 sq.mi.
                        18020109 -- Lower Sacramento. California.
                                      Area =     1720 sq.mi.
                        18020110 -- Lower Cache. California.
                                      Area =      190 sq.mi.
                        18020111 -- Lower American. California.
                                      Area =      299 sq.mi.
                        18020112 -- Sacramento-Upper Clear. California.
                                      Area =      269 sq.mi.
                        18020113 -- Cottonwood headwaters. California.
                                      Area =      602 sq.mi.
                        18020114 -- Upper Elder-Upper Thomes.
                                    California.
                                      Area =      328 sq.mi.
                        18020115 -- Upper Stony. California.
                                      Area =      731 sq.mi.
                        18020116 -- Upper Cache. California.
                                      Area =      939 sq.mi.
                        18020117 -- Upper Putah. California.
                                      Area =      558 sq.mi.
                        18020118 -- Upper Cow-Battle. California.
                                      Area =      832 sq.mi.
                        18020119 -- Mill-Big Chico. California.
                                      Area =      896 sq.mi.
                        18020120 -- Upper Butte. California.
                                      Area =      202 sq.mi.
                        18020121 -- North Fork Feather. California.
                                      Area =     1190 sq.mi.
                        18020122 -- East Branch North Fork Feather.
                                    California.
                                      Area =     1010 sq.mi.
                        18020123 -- Middle Fork Feather. California.
                                      Area =     1350 sq.mi.
                        18020124 -- Honcut headwaters. California.
                                      Area =      107 sq.mi.
                        18020125 -- Upper Yuba. California.
                                      Area =     1290 sq.mi.
                        18020126 -- Upper Bear. California.
                                      Area =      361 sq.mi.
                        18020127 -- Upper Coon-Upper Auburn. California.
                                      Area =       89 sq.mi.
                        18020128 -- North Fork American. California.
                                      Area =      998 sq.mi.
                        18020129 -- South Fork American. California.
                                      Area =      843 sq.mi.


  Subregion  1803 -- Tulare-Buena Vista Lakes: The drainage into the
                     Tulare and Buena Vista Lake closed basins.
                     California.
                       Area =    16200 sq.mi.

    Accounting Unit 180300 -- Tulare-Buena Vista Lakes. California.
                                Area =    16200 sq.mi.

      Cataloging Units  18030001 -- Upper Kern. California.
                                      Area =     1070 sq.mi.
                        18030002 -- South Fork Kern. California.
                                      Area =      964 sq.mi.
                        18030003 -- Middle Kern-Upper Tehachapi-
                                    Grapevine. California.
                                      Area =     1310 sq.mi.
                        18030004 -- Upper Poso. California.
                                      Area =      268 sq.mi.
                        18030005 -- Upper Deer-Upper White. California.
                                      Area =      345 sq.mi.
                        18030006 -- Upper Tule. California.
                                      Area =      410 sq.mi.
                        18030007 -- Upper Kaweah. California.
                                      Area =      828 sq.mi.
                        18030008 -- Mill. California.
                                      Area =      156 sq.mi.
                        18030009 -- Upper Dry. California.
                                      Area =      124 sq.mi.
                        18030010 -- Upper King. California.
                                      Area =     1520 sq.mi.
                        18030011 -- Upper Los Gatos-Avenal. California.
                                      Area =      702 sq.mi.
                        18030012 -- Tulare-Buena Vista Lakes.
                                    California.
                                      Area =     8510 sq.mi.


  Subregion  1804 -- San Joaquin: The San Joaquin River Basin.
                     California.
                        Area =   15600 sq.mi.

    Accounting Unit 180400 -- San Joaquin. California.
                                Area =    15600 sq.mi.

      Cataloging Units  18040001 -- Middle San Joaquin-Lower
                                    Chowchilla. California.
                                      Area =     2640 sq.mi.
                        18040002 -- Middle San Joaquin-Lower
                                    Merced-Lower Stanislaus. California.
                                      Area =     1830 sq.mi.
                        18040003 -- San Joaquin Delta. California.
                                      Area =      938 sq.mi.
                        18040004 -- Lower Calaveras-Mormon Slough.
                                    California.
                                      Area =      235 sq.mi.
                        18040005 -- Lower Cosumnes-Lower Mokelumne.
                                    California.
                                      Area =      747 sq.mi.
                        18040006 -- Upper San Joaquin. California.
                                      Area =     1680 sq.mi.
                        18040007 -- Upper Chowchilla-Upper Fresno.
                                    California.
                                      Area =      938 sq.mi.
                        18040008 -- Upper Merced. California.
                                      Area =     1080 sq.mi.
                        18040009 -- Upper Tuolumne. California.
                                      Area =     1600 sq.mi.
                        18040010 -- Upper Stanislaus. California.
                                      Area =      971 sq.mi.
                        18040011 -- Upper Calaveras. California.
                                      Area =      383 sq.mi.
                        18040012 -- Upper Mokelumne. California.
                                      Area =      764 sq.mi.
                        18040013 -- Upper Cosumnes. California.
                                      Area =      632 sq.mi.
                        18040014 -- Panoche-San Luis Reservoir.
                                    California.
                                      Area =     1120 sq.mi.


  Subregion  1805 -- San Francisco Bay: The drainage into the Pacific
                     Ocean from the Stemple Creek Basin boundary
                     to and including the Pescadero Creek Basin,
                     excluding the Sacramento and San Joaquin River
                     Basins. California.
                       Area =     4470 sq.mi.

    Accounting Unit 180500 -- San Francisco Bay. California.
                                Area =     4470 sq.mi.

      Cataloging Units  18050001 -- Suisun Bay. California.
                                      Area =      644 sq.mi.
                        18050002 -- San Pablo Bay. California.
                                      Area =     1200 sq.mi.
                        18050003 -- Coyote. California.
                                      Area =      831 sq.mi.
                        18050004 -- San Francisco Bay. California.
                                      Area =     1200 sq.mi.
                        18050005 -- Tomales-Drake Bays. California.
                                      Area =      339 sq.mi.
                        18050006 -- San Francisco Coastal South.
                                    California.
                                      Area =      256 sq.mi.


  Subregion  1806 -- Central California Coastal: The drainage into the
                     Pacific Ocean from the Pescadero Creek Basin
                     boundary to and including the Rincon Creek Basin.
                     California.
                       Area =    11400 sq.mi.

    Accounting Unit 180600 -- Central California Coastal.
                              California.
                                Area =    11400 sq.mi.

      Cataloging Units  18060001 -- San Lorenzo-Soquel. California.
                                      Area =      374 sq.mi.
                        18060002 -- Pajaro. California.
                                      Area =     1290 sq.mi.
                        18060003 -- Carrizo Plain. California.
                                      Area =      440 sq.mi.
                        18060004 -- Estrella. California.
                                      Area =      930 sq.mi.
                        18060005 -- Salinas. California.
                                      Area =     3250 sq.mi.
                        18060006 -- Central Coastal. California.
                                      Area =     1070 sq.mi.
                        18060007 -- Cuyama. California.
                                      Area =     1130 sq.mi.
                        18060008 -- Santa Maria. California.
                                      Area =      675 sq.mi.
                        18060009 -- San Antonio. California.
                                      Area =      219 sq.mi.
                        18060010 -- Santa Ynez. California.
                                      Area =      893 sq.mi.
                        18060011 -- Alisal-Elkhorn Sloughs. California.
                                      Area =      232 sq.mi.
                        18060012 -- Carmel. California.
                                      Area =      305 sq.mi.
                        18060013 -- Santa Barbara Coastal. California.
                                      Area =      381 sq.mi.
                        18060014 -- Santa Barbara Channel Islands.
                                    California.
                                      Area =      187 sq.mi.


  Subregion  1807 -- Southern California Coastal: The drainage within
                     the United States that discharges into
                     the Pacific Ocean from the Rincon Creek Basin
                     boundary to the California-Baja California
                     international boundary. California.
                       Area =    11100 sq.mi.

    Accounting Unit 180701 -- Ventura-San Gabriel Coastal: The drainage
                              into the Pacific Ocean from the Rincon
                              Creek Basin boundary to and including the
                              San Grabriel River Basin. California.
                                Area =     4530 sq.mi.

      Cataloging Units  18070101 -- Ventura. California.
                                      Area =      279 sq.mi.
                        18070102 -- Santa Clara. California.
                                      Area =     1610 sq.mi.
                        18070103 -- Calleguas. California.
                                      Area =      377 sq.mi.
                        18070104 -- Santa Monica Bay. California.
                                      Area =      575 sq.mi.
                        18070105 -- Los Angeles. California.
                                      Area =      819 sq.mi.
                        18070106 -- San Gabriel. California.
                                      Area =      713 sq.mi.
                        18070107 -- San Pedro Channel Islands.
                                    California.
                                      Area =      154 sq.mi.

    Accounting Unit 180702 -- Santa Ana: The drainage into the Pacific
                              Ocean from the San Gabriel River Basin
                              boundary to the Moro Canyon drainage
                              boundary Near Laguna Beach. California.
                                Area =     2680 sq.mi.

      Cataloging Units  18070201 -- Seal Beach. California.
                                      Area =       90 sq.mi.
                        18070202 -- San Jacinto. California.
                                      Area =      757 sq.mi.
                        18070203 -- Santa Ana. California.
                                      Area =     1680 sq.mi.
                        18070204 -- Newport Bay. California.
                                      Area =      154 sq.mi.

    Accounting Unit 180703 -- Laguna-San Diego Coastal: The drainage
                              within the United States that discharges
                              into the Pacific Ocean from and
                              including the Moro Canyon drainage basin
                              near Laguna Beach to the California-Baja
                              California international boundary.
                              California.
                                Area =     3860 sq.mi.

      Cataloging Units  18070301 -- Aliso-San Onofre. California.
                                      Area =      498 sq.mi.
                        18070302 -- Santa Margarita. California.
                                      Area =      731 sq.mi.
                        18070303 -- San Luis Rey-Escondido. California.
                                      Area =      766 sq.mi.
                        18070304 -- San Diego. California.
                                      Area =     1390 sq.mi.
                        18070305 -- Cottonwood-Tijuana. California.
                                      Area =      477 sq.mi.


  Subregion  1808 -- North Lahontan: The drainage east of the Sierra
                     Nevada and north of the Truckee River Basin which
                     includes the Lahonton closed basins that
                     discharge into California. California, Nevada.
                       Area =     4480 sq.mi.

    Accounting Unit 180800 -- North Lahontan. California, Nevada.
                                Area =     4480 sq.mi.

      Cataloging Units  18080001 -- Surprise Valley. California, Nevada.
                                      Area =      878 sq.mi.
                        18080002 -- Madeline Plains. California, Nevada.
                                      Area =      835 sq.mi.
                        18080003 -- Honey-Eagle Lakes. California,
                                    Nevada.
                                      Area =     2770 sq.mi.


  Subregion  1809 -- Northern Mojave-Mono Lake: The Closed Desert Basins
                     that discharge into South Central California,
                     including Mono Lake, Owens Lake, Death Valley,
                     and the Upper Mojave Desert. California, Nevada.
                       Area =    28000 sq.mi.

    Accounting Unit 180901 -- Mono-Owens Lakes. The Mono Lake and
                              Owens Lake closed basins. California,
                              Nevada.
                                Area =     4310 sq.mi.

      Cataloging Units  18090101 -- Mono Lake. California, Nevada.
                                      Area =     1070 sq.mi.
                        18090102 -- Crowley Lake. California, Nevada.
                                      Area =     1900 sq.mi.
                        18090103 -- Owens Lake. California.
                                      Area =     1340 sq.mi.

    Accounting Unit 180902 -- Northern Mojave: The Closed Desert Basins
                              that discharge into South Central
                              California, including Death Valley and the
                              Upper Mojave Desert, excluding Mono Lake and
                              Owens Lake. California, Nevada.
                                Area =    23600 sq.mi.

      Cataloging Units  18090201 -- Eureka-Saline Valleys. California,
                                    Nevada.
                                      Area =     1640 sq.mi.
                        18090202 -- Upper Amargosa. California, Nevada.
                                      Area =     3340 sq.mi.
                        18090203 -- Death Valley-Lower Amargosa.
                                    California, Nevada.
                                      Area =     5330 sq.mi.
                        18090204 -- Panamint Valley. California.
                                      Area =     1600 sq.mi.
                        18090205 -- Indian Wells-Searles Valleys.
                                    California.
                                      Area =     2020 sq.mi.
                        18090206 -- Antelope-Fremont Valleys.
                                    California.
                                      Area =     3310 sq.mi.
                        18090207 -- Coyote-Cuddeback Lakes. California.
                                      Area =     1820 sq.mi.
                        18090208 -- Mojave. California.
                                      Area =     4580 sq.mi.


  Subregion  1810 -- Southern Mojave-Salton Sea: The closed desert
                     basins in Southeastern California, including the
                     Lower Mojave Desert and the Salton Sea.
                     California.
                       Area =    16000 sq.mi.

    Accounting Unit 181001 -- Southern Mojave: The Lower Mojave Desert.
                              California.
                                Area =     8700 sq.mi.

      Cataloging Unit   18100100 -- Southern Mojave. California.
                                      Area =     8700 sq.mi.

    Accounting Unit 181002 -- Salton Sea: The Salton Sea closed basin.
                              California.
                                Area =     7250 sq.mi.

      Cataloging Unit   18100200 -- Salton Sea. California.
                                      Area =     7250 sq.mi.


Region 19  Alaska Region -- The drainage within the state of Alaska.
           Includes all of Alaska.


  Subregion  1901 -- Arctic Slope: The North Slope drainage within the
                     United States that discharges into the Arctic
                     Ocean, including the bays, islands, and associated
                     waters, from the Alaska-Yukon international
                     boundary to Cape Lisburne. Alaska.
                       Area =    81000 sq.mi.

    Accounting Unit 190100 -- Arctic Slope. Alaska.
                                Area =    81000 sq.mi.

      Cataloging Units  19010001 -- East Arctic Slope. Alaska.
                                      Area =    24000 sq.mi.
                        19010002 -- Colville. Alaska.
                                      Area =    23000 sq.mi.
                        19010003 -- West Arctic Slope. Alaska.
                                      Area =    34000 sq.mi.


  Subregion  1902 -- Northwest Alaska: The coastal drainage from Cape
                     Lisburne to the Yukon River Basin boundary,
                     including the bays, sounds, islands, and
                     associated waters; and St. Lawrence Island. Alaska.
                       Area =    75000 sq.mi.

    Accounting Unit 190200 -- Northwest Alaska. Alaska.
                                Area =    75000 sq.mi.

      Cataloging Units  19020001 -- Kotzebue Sound. Alaska.
                                      Area =    49000 sq.mi.
                        19020002 -- Norton Sound-St. Lawrence Island.
                                    Alaska.
                                      Area =    26000 sq.mi.


  Subregion  1903 -- Yukon: The Yukon River Basin within the United
                     States, including its delta. Alaska.
                       Area =   204000 sq.mi.

    Accounting Unit 190300 -- Yukon. Alaska.
                                Area =   204000 sq.mi.

      Cataloging Units  19030001 -- Fortymile-White. Alaska.
                                      Area =     9700 sq.mi.
                        19030002 -- Upper Yukon. Alaska.
                                      Area =    60000 sq.mi.
                        19030003 -- Middle Yukon. Alaska.
                                      Area =    21000 sq.mi.
                        19030004 -- Tanana. Alaska.
                                      Area =    44000 sq.mi.
                        19030005 -- Koyukuk. Alaska.
                                      Area =    32000 sq.mi.
                        19030006 -- Lower Yukon. Alaska.
                                      Area =    37000 sq.mi.


  Subregion  1904 -- Southwest Alaska: The coastal drainage from the
                     Yukon River Basin boundary to Kupreanof Point on the
                     Alaska Peninsula, including the bays, islands, and
                     associated waters; and the islands of St. Matthew,
                     Nunivak and Pribilof, and all of the Aleutian
                     Islands. Alaska.
                       Area =   124000 sq.mi.

    Accounting Unit 190400 -- Southwest Alaska. Alaska.
                                Area =   124000 sq.mi.

      Cataloging Units  19040001 -- Kuskokwim Bay-Nunivak Island-St.
                                    Matthew Island. Alaska.
                                      Area =    61000 sq.mi.
                        19040002 -- Bristol Bay. Alaska.
                                      Area =    43000 sq.mi.
                        19040003 -- Aleutian-Pribilof Islands. Alaska.
                                      Area =    20000 sq.mi.


  Subregion  1905 -- South Central Alaska: The coastal drainage within
                     the United States from Kupreanof Point on the
                     Alaska Peninsula to the Alaska-Yukon international
                     boundary and southward to Point Riou, including the
                     bays, islands, sounds, and associated waters.
                     Alaska.
                       Area =    99000 sq.mi.

    Accounting Unit 190500 -- South Central Alaska. Alaska.
                                Area =    99000 sq.mi.

      Cataloging Units  19050001 -- Kodiak-Shelikof. Alaska.
                                      Area =    12000 sq.mi.
                        19050002 -- Cook Inlet. Alaska.
                                      Area =    47000 sq.mi.
                        19050003 -- Gulf of Alaska. Alaska.
                                      Area =    40000 sq.mi.


  Subregion  1906 -- Southeast Alaska: The coastal drainage within the
                     United States from Point Riou to the Alaksa-British
                     Columbia international boundary, including the bays,
                     islands, sounds, and associated waters.  Alaska.
                       Area =      49000 sq.mi.

    Accounting Unit 190600 -- Southeast Alaska. Alaska.
                                Area =    49000 sq.mi.

      Cataloging Unit   19060000 -- Southeast Alaska. Alaska.
                                      Area =    49000 sq.mi.


Region 20  Hawaii Region -- The drainage within the state of Hawaii.
           Includes all of Hawaii.


  Subregion  2001 -- Hawaii: The drainage on the island of Hawaii; and
                     associated waters. Hawaii.
                       Area =     4030 sq.mi.

    Accounting Unit 200100 -- Hawaii. Hawaii.
                                Area =     4030 sq.mi.

      Cataloging Unit   20010000 -- Hawaii. Hawaii.
                                      Area =     4030 sq.mi.


  Subregion  2002 -- Maui: The drainage on the island of Maui; and
                     associated waters. Hawaii.
                       Area =      730 sq.mi.

    Accounting Unit 200200 -- Maui. Hawaii.
                                Area =      730 sq.mi.

      Cataloging Unit   20020000 -- Maui. Hawaii.
                                      Area =      730 sq.mi.


  Subregion  2003 -- Kahoolawe: The drainage on the island of Kahoolawe;
                     and associated waters. Hawaii.
                       Area =       45 sq.mi.

    Accounting Unit 200300 -- Kahoolawe. Hawaii.
                                Area =       45 sq.mi.

      Cataloging Unit   20030000 -- Kahoolawe. Hawaii.
                                      Area =       45 sq.mi.


  Subregion  2004 -- Lanai: The drainage on the island of Lanai; and
                     associated waters. Hawaii.
                       Area =      140 sq.mi.

    Accounting Unit 200400 -- Lanai. Hawaii.
                                Area =      140 sq.mi.

      Cataloging Unit   20040000 -- Lanai. Hawaii.
                                      Area =      140 sq.mi.


  Subregion  2005 -- Molokai: The drainage on the island of Molokai; and
                     associated waters. Hawaii.
                       Area =      260 sq.mi.

    Accounting Unit 200500 -- Molokai. Hawaii.
                                Area =      260 sq.mi.

      Cataloging Unit   20050000 -- Molokai. Hawaii.
                                      Area =      260 sq.mi.


  Subregion  2006 -- Oahu: The drainage on the island of Oahu; and
                     associated waters. Hawaii.
                       Area =      630 sq.mi.

    Accounting Unit 200600 -- Oahu. Hawaii.
                                Area =      630 sq.mi.

      Cataloging Unit   20060000 -- Oahu. Hawaii.
                                      Area =      630 sq.mi.


  Subregion  2007 -- Kauai: The drainage on the island of Kauai; and
                     associated waters. Hawaii.
                       Area =      560 sq.mi.

    Accounting Unit 200700 -- Kauai. Hawaii.
                                Area =      560 sq.mi.

      Cataloging Unit   20070000 -- Kauai. Hawaii.
                                      Area =      560 sq.mi.


  Subregion  2008 -- Niihau: The drainage on the islands of Niihau
                     and Kaula; and associated waters. Hawaii.
                       Area =       72 sq.mi.

    Accounting Unit 200800 -- Niihau. Hawaii.
                                Area =       72 sq.mi.

      Cataloging Unit   20080000 -- Niihau. Hawaii.
                                      Area =       72 sq.mi.


  Subregion  2009 -- Northwestern Hawaiian Islands: The drainage on
                     Kure, Laysan, Lisianski, Necker, and Nihoa Islands;
                     Gardner Pinnacles; Maro, and Pearl and Hermes
                     Reefs; French Frigate Shoals; and other islets,
                     reefs, and associated waters northwest of Niipau
                     Island. Hawaii.
                       Area =     < 10 sq.mi.

    Accounting Unit 200900 -- Northwestern Hawaiian Islands. Hawaii.
                                Area =     < 10 sq.mi.

      Cataloging Unit   20090000 -- Northwestern Hawaiian Islands.
                                    Hawaii.
                                      Area =     < 10 sq.mi.


Region 21  Caribbean Region -- The drainage within: (a) the Commonwealth
           of Puerto Rico; (b) the Virgin Islands of the United States;
           and (c) other United States Caribbean outlying areas. Includes
           land areas over which the United States has some degree of
           interest, jurisdiction, or sovereignty.


  Subregion  2101 -- Puerto Rico: The drainage and associated waters
                     within the Commonwealth of Puerto Rico.
                     Puerto Rico.
                       Area =     3480 sq.mi.

    Accounting Unit 210100 -- Puerto Rico. Commonwealth of Puerto Rico.
                                Area =     3480 sq.mi.

      Cataloging Units  21010001 -- Interior Puerto Rico.
                                    Puerto Rico.
                                      Area =      404 sq.mi.
                        21010002 -- Cibuco-Guajataca. Puerto Rico.
                                      Area =      566 sq.mi.
                        21010003 -- Culebrinas-Guanajibo. Puerto Rico.
                                      Area =      504 sq.mi.
                        21010004 -- Southern Puerto Rico.