U.S. Fish and Wildlife Service

Data Element: ECOSYSTEM UNIT NUMBER

Description: Description: One- and two-digit numbers that represent the
ecosystem unit boundaries of the United States, which are drawn
primarily along watershed boundaries.

Revision Date: October 18, 2005

Reason for Revision: Ecosystems 30 and 32 have been renamed to coincide
with FWS Ecoregion names in the Southeast (Region 4)

+------------------------------------------------+---------+----------+
| ECOSYSTEM                                      | ECONUM  | LEAD     |
|                                                |         |          |
|                                                |         | REGION   |
+================================================+=========+==========+
| NOT APPLICABLE                                 | 00      | 0        |
+------------------------------------------------+---------+----------+
| NORTH PACIFIC COAST                            | 01      | 1        |
+------------------------------------------------+---------+----------+
| KLAMATH/CENTRAL PACIFIC COAST                  | 02      | 1        |
+------------------------------------------------+---------+----------+
| CENTRAL VALLEY OF CALIFORNIA/SAN FRANCISCO BAY | 03      | 1        |
+------------------------------------------------+---------+----------+
| SOUTHERN CALIFORNIA                            | 04      | 1        |
+------------------------------------------------+---------+----------+
| COLUMBIA BASIN                                 | 05      | 1        |
+------------------------------------------------+---------+----------+
| INTERIOR BASIN                                 | 06      | 1        |
+------------------------------------------------+---------+----------+
| LOWER COLORADO RIVER                           | 07      | 2        |
+------------------------------------------------+---------+----------+
| GILA/SALT/VERDE RIVER                          | 08      | 2        |
+------------------------------------------------+---------+----------+
| MIDDLE AND UPPER RIO GRANDE                    | 09      | 2        |
+------------------------------------------------+---------+----------+
| LOWER RIO GRANDE                               | 10      | 2        |
+------------------------------------------------+---------+----------+
| PECOS RIVER                                    | 11      | 2        |
+------------------------------------------------+---------+----------+
| EDWARDS PLATEAU                                | 12      | 2        |
+------------------------------------------------+---------+----------+
| EAST TEXAS                                     | 13      | 2\.      |
+------------------------------------------------+---------+----------+
| TEXAS GULF COAST                               | 14      | 2        |
+------------------------------------------------+---------+----------+
| ARKANSAS/RED RIVERS                            | 15      | 2        |
+------------------------------------------------+---------+----------+
| SOUTHERN APPALACHIANS                          | 16      | 4        |
+------------------------------------------------+---------+----------+
| UPPER COLORADO RIVER                           | 17      | 6        |
+------------------------------------------------+---------+----------+
| PLATTE/KANSAS RIVERS                           | 18      | 6        |
+------------------------------------------------+---------+----------+
| UPPER MISSOURI, YELLOWSTONE AND UPPER COLUMBIA | 19      | 6        |
| RIVER                                          |         |          |
+------------------------------------------------+---------+----------+
| MISSOURI MAIN STEM                             | 20      | 6        |
+------------------------------------------------+---------+----------+
| LOWER MISSOURI RIVER                           | 21      | 3        |
+------------------------------------------------+---------+----------+
| MISSISSIPPI HEADWATERS/TALLGRASS PRAIRIE       | 22      | 3        |
+------------------------------------------------+---------+----------+
| UPPER MISSISSIPPI RIVER/TALLGRASS PRAIRIE      | 23      | 3        |
+------------------------------------------------+---------+----------+
| GREAT LAKES                                    | 24      | 3        |
+------------------------------------------------+---------+----------+
| OZARK WATERSHEDS                               | 25      | 3        |
+------------------------------------------------+---------+----------+
| OHIO RIVER VALLEY                              | 26      | 5        |
+------------------------------------------------+---------+----------+
| LOWER MISSISSIPPI RIVER                        | 27      | 4        |
+------------------------------------------------+---------+----------+
| TENNESSEE/CUMBERLAND RIVER                     | 28      | 4        |
+------------------------------------------------+---------+----------+
| CENTRAL GULF WATERSHEDS                        | 29      | 4        |
+------------------------------------------------+---------+----------+
| NORTHEAST GULF WATERSHEDS                      | 30      | 4        |
+------------------------------------------------+---------+----------+
| ALTAMAHA WATERSHEDS                            | 31      | 4        |
+------------------------------------------------+---------+----------+
| NORTH FLORIDA                                  | 32      | 4        |
+------------------------------------------------+---------+----------+
| SAVANNAH/SANTEE/PEE DEE RIVERS                 | 33      | 4        |
+------------------------------------------------+---------+----------+
| ROANOKE/TAR/NEUSE/CAPE FEAR RIVERS             | 34      | 4        |
+------------------------------------------------+---------+----------+
| CARRIBEAN                                      | 35      | 4        |
+------------------------------------------------+---------+----------+
| DELAWARE RIVER/DELMARVA COASTAL AREA           | 36      | 5        |
+------------------------------------------------+---------+----------+
| HUDSON RIVER/NEW YORK BIGHT                    | 37      | 5        |
+------------------------------------------------+---------+----------+
| CONNECTICUT RIVER/LONG ISLAND SOUND            | 38      | 5        |
+------------------------------------------------+---------+----------+
| GULF OF MAINE RIVERS                           | 39      | 5        |
+------------------------------------------------+---------+----------+
| LAKE CHAMPLAIN                                 | 40      | 5        |
+------------------------------------------------+---------+----------+
| CHESAPEAKE BAY/SUSQUEHANNA RIVER               | 41      | 5        |
+------------------------------------------------+---------+----------+
| PACIFIC ISLANDS                                | 42      | 1        |
+------------------------------------------------+---------+----------+
| ARCTIC ALASKA                                  | 43      | 7        |
+------------------------------------------------+---------+----------+
| NORTHWEST ALASKA                               | 44      | 7        |
+------------------------------------------------+---------+----------+
| INTERIOR ALASKA                                | 45      | 7        |
+------------------------------------------------+---------+----------+
| SOUTHEAST ALASKA                               | 46      | 7        |
+------------------------------------------------+---------+----------+
| SOUTH CENTRAL ALASKA                           | 47      | 7        |
+------------------------------------------------+---------+----------+
| BRISTOL BAY/KODIAK                             | 48      | 7        |
+------------------------------------------------+---------+----------+
| YUKON-KUSKOKWIM DELTA                          | 49      | 7        |
+------------------------------------------------+---------+----------+
| BERING SEA/ALEUTIAN ISLANDS                    | 50      | 7        |
+------------------------------------------------+---------+----------+
| BEAUFORT/CHUKCHI SEAS                          | 51      | 7        |
+------------------------------------------------+---------+----------+
| NORTH PACIFIC/GULF OF ALASKA                   | 52      | 7        |
+------------------------------------------------+---------+----------+
| SOUTH FLORIDA                                  | 53      | 4        |
+------------------------------------------------+---------+----------+