U.S. Department of the Interior

U.S. Geological Survey

Open-File Report 2011–1029

Prepared in cooperation with the 

U.S. Department of Homeland Security 

Federal Emergency Management Agency

Elevation of the March–April 2010 Flood High Water in 

Selected River Reaches in Rhode Island

Elevation of the March–April 2010 Flood 

High Water in Selected River Reaches in 

Rhode Island

By Phillip J. Zarriello and Gardner C. Bent

Prepared in cooperation with the

U.S. Department of Homeland Security

Federal Emergency Management Agency

Open-File Report 2011–1029

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2011

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reproduce any copyrighted materials contained within this report.

Suggested citation:

Zarriello, P.J., and Bent, G.C., 2011, Elevation of the March–April 2010 flood high water in selected river reaches in 

Rhode Island: U.S. Geological Survey Open-File Report 2011–1029, 34 p.
iii

Contents

Abstract ..........................................................................................................................................................1

Introduction.....................................................................................................................................................1

Purpose and Scope ..............................................................................................................................1

Study Area..............................................................................................................................................1

Rainfall and Antecedent Conditions ..................................................................................................3

Streamflows...........................................................................................................................................3

Methods ..........................................................................................................................................................5

Setting High-Water Marks ..................................................................................................................9

Elevation of High-Water Marks ..........................................................................................................9

Summary of High-Water Marks Identified...............................................................................................13

Potential Use of High-Water Data ...................................................................................................13

Summary........................................................................................................................................................13

Acknowledgments.......................................................................................................................................16

References Cited..........................................................................................................................................16

Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army 

Corps of Engineers.........................................................................................................................18

Figures

1. Map showing river basins where high-water elevations were determined following 

the March–April 2010 floods in Rhode Island ..........................................................................2

2. Map showing total rainfall during February and March 2010 in southeastern 

New England .................................................................................................................................4

3. Graphs showing daily rainfall (A) hyetographs and (B) cumulative totals during 

February and March 2010 at five National Weather Service stations in 

Rhode Island..................................................................................................................................5

4. Graphs showing period-of-record daily mean flow percentiles and 2010 daily mean 

flow at (A) Hunt River near East Greenwich (01117000) and (B) Wood River at Hope 

Valley (01118000), Rhode Island..................................................................................................8

5. Photographs showing examples of high-water mark debris lines on trees and structures following the March–April 2010 floods in Rhode Island ............................................10

6. Map showing fixed-based station Global Positioning System receiver network and 

National Geodetic Survey bench-mark control points used in the determination of 

the elevation of the March–April 2010 flood high water in Rhode Island.........................11

7. Map showing areas of availability of LIght Detection and Ranging (LIDAR) data and 

projected 2011 LIDAR data in Rhode Island and adjacent states.......................................15
iv

Tables

1. Summary of March–April 2010 flood peak stage and flow data at selected U.S. 

Geological Survey streamgages in Rhode Island and southeastern Massachusetts ......6

2. Summary of Global Positioning System (GPS) measurements made to National 

Geodetic Survey (NGS) bench marks......................................................................................12

3. Summary of high-water marks (HWMs) established by the U.S. Geological 

Survey (USGS) and the U.S. Army Corps of Engineers (USACE) following the 

March–April 2010 floods in Rhode Island...............................................................................14

Conversion Factors

Multiply By To obtain

Length

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square mile (mi2

) 259.0 hectare (ha)

square mile (mi2

) 2.590 square kilometer (km2) 

Flow rate

cubic foot per second (ft3

/s) 0.02832 cubic meter per second (m3/s)

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 

(NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Elevation, as used in this report, refers to distance above the vertical datum.
Elevation of the March–April 2010 Flood High Water in 

Selected River Reaches in Rhode Island

By Phillip J. Zarriello and Gardner C. Bent

Abstract 

A series of widespread, large, low-pressure systems in 

southern New England in late February through late March 

2010 resulted in record, or near record, rainfall and runoff. The 

total rainfall in the region during this period ranged from about 

19 to 25 inches, which coupled with seasonal low evaporation, resulted in record or near record peak flows at 21 of 25 

streamgages in Rhode Island and southeastern Massachusetts. The highest record peaks occurred in late March–early 

April and generally greatly exceeded the earlier March peaks 

that were near or exceeded the peak of record for 10 of the 

25 streamgages. 

Determination of the flood-peak high-water elevation is a 

critical part of the recovery operations and post-flood analysis 

for improving future flood-hazard maps and flood-management practices. High-water marks (HWMs) were identified by 

the U.S. Geological Survey (USGS) from April 2–7, 2010, and 

by the U.S. Army Corps of Engineers (USACE) from April 

3–7, 2010, in five major river basins including the Blackstone, 

Hunt, Moshassuck, Pawtuxet, and Woonasquatucket along the 

mainstems and in many tributaries. The USGS identified 276 

HWMs at 137 sites. A site may have more than one HWM, 

typically upstream and downstream of a bridge. The USACE 

identified 144 HWMs at 127 sites. The HWMs identified by 

the USGS and USACE covered about 170 river miles, determined from the upstream and downstream HWMs. Elevation 

of HWMs were later determined to a standard vertical datum 

(NAVD 88) using the Global Navigation Satellite System 

and survey-grade Global Positioning System (GPS) receivers 

along with standard optical surveying equipment. 

Introduction

Flood flows and water levels set, or nearly set, record 

highs in late March into early April 2010 following repeated 

storms. In the wake of the severe flooding, a state of emergency was declared in many communities in Rhode Island, 

and a statewide Presidential Disaster (number 3311) was 

declared on March 31, 2010. The President’s action affected 

the emergency recovery operations in Bristol, Kent, Newport, 

Providence, and Washington Counties. No official estimate 

of the flood damages could be found, but the flood has been 

characterized as the worst in 200 years and is estimated to 

have damages in the $100’s of millions of dollars. As part of 

the recovery operations, the U.S. Department of Homeland 

Security’s Federal Emergency Management Agency (FEMA) 

required analysis of the flood to assess damages and to prepare 

for and minimize future flood damages. 

Determination of the peak high-water elevation is a critical part of the recovery operations and post-flood analysis. 

This information also is extremely valuable when defining 

and understanding flood risks for flood management. The U.S. 

Geological Survey (USGS) initially entered into an agreement 

with the U.S. Army Corps of Engineers (USACE) on April 

2010 to identify high-water marks (HWMs) in selected river 

reaches in Rhode Island. A subsequent agreement between 

FEMA and the USGS was signed in August 2010 to complete 

the HWM survey work from the March–April 2010 flood and 

document the work as part of a larger project with FEMA to 

support flood-mitigation efforts.

Purpose and Scope

The purpose of this report is to document the elevation 

of peak high water following the March–April 2010 flood in 

selected river reaches in Rhode Island. The report describes 

the climate and flow conditions prior to the flood, recorded 

peak gage heights and flows at USGS streamgages, methods 

used to identify high-water marks, and the surveying methods 

used to obtain a vertical datum of the HWM. The report summarizes the HWM data for selected river reaches and presents 

data in tables and figures.

Study Area

High-water elevations from the March–April 2010 flood 

were obtained in selected river reaches throughout Rhode 

Island (fig. 1). These include the Blackstone, Branch, Hunt, 

Moshassuck, Pawtuxet, Pawcatuck, and Woonasquatucket 

Rivers (basin names shown in fig. 1). HWMs and elevations were also obtained in many main tributaries to these 

rivers including the including the Beaver, Chipuxet, Wood, 

and Queen-Usquepaug Rivers in the Pawcatuck River basin, 

the North and South Branches and Pocasset Rivers in the 
2 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

TAUNTON

TEN

MILE

01109000

01109060

01109070

MASSACHUSETTS

MASSACHUSETTS

Providence

01118500

01112500

01111500 01111300

01114000

01114500

01116500

01117000

01115187

01116000

01115098

01117350

01117370

01117420

01117468

01117430 01117500

01117800

01118000

01109403

MOSHASSUCK

WOONASUATUCKET

BLACKSTONE BRANCH

PAWCATUCK 

HUNT

PAWTUXET

0 10 MILES

0 2 64 8 10 KILOMETERS

2 64 8

HUNT

Base from Rhode Island Geographic Information System; State boundary, 1:24,000, 1989;

Hydrolines 1,24,000, 1998; Lakes and Ponds, 1:24,000, 1989; Basins, 1:24,000,1990;

Polyconic projection. North American Datum of 1983;

Rhode Island State Plane coordinate system mainland zone 1998

01117000

EXPLANATION

U.S. Army Corps of Engineers

U.S. Geological Survey (USGS)

Basin boundary and name

USGS streamgage and number

Subbasin boundary

High-water mark established by:

71°50' 71°40' 71°30' 71°20' 71°10'

42°

41°50'

41°40'

41°30'

41°20'

Figure 1. River basins where high-water elevations were determined following the March–April 2010 floods in Rhode Island. 

Streamgage 01108000 and 01111212 not shown because they are outside the map extent.
Introduction 3

Pawtuxet River Basin, and other smaller tributaries (subbasin 

boundaries are shown in figure 1, but the names are not for 

clarity). In general, HWMs were obtained over a large part of 

Rhode Island, but the greatest concentration of HWMs was 

obtained in and around the Providence area. 

Rainfall and Antecedent Conditions

A series of widespread, large, low-pressure systems 

passed through the New England region in late February and 

in mid- through late March 2010 resulted in record, or near 

record, amounts of rainfall. The total March 2010 rainfall 

at Kingston southeast of Providence is the highest monthly 

recorded (19.37 in) by the National Weather Service (NWS) 

since 1893 (COOPID–374266, fig. 2). The second highest 

total monthly rainfall recorded at Kingston (14.35 in.) was in 

June 1982.

 During a period when evaporation losses are normally 

low, these low-pressure systems maintained wet soil-moisture 

conditions and filled available surface storages that resulted in 

record, or near record, floods in southern New England. The 

Northeast Regional Climate Center (2010) March Climate 

Summary report described the following conditions: “The 

mid-March storm hit the region from March 13–15, dropping as much as 9 inches of rain in eastern Massachusetts. As 

floodwaters began to recede an additional 2 to 5 inches of rain 

fell on March 22nd and 23rd, followed by 5 to 9 inches of rain 

on the 29th and 30th.” 

Rainfall hyetographs and cumulative rainfall (figs. 3A 

and 3B) for five NWS Rhode Island daily record stations 

(COOPIDs–374266, 375270, 376698, 377581, and 379423; 

fig. 2) exemplify the pattern of excessive moisture during 

late February and March. Prior to the March high water, a 

late February storm dropped about 5 inches of rain over the 

region, saturating soils, filling available storage, and elevating 

streamflows. Thus, conditions were primed for the first runoff 

response following the 4 to 7 inches of rain that fell between 

March 13th and 15th. From late February through mid-March 

total precipitation ranged from about 8 to 12 inches in the 

study area. As high water began to recede, an additional 2 to 

5 inches of rain fell on March 22–23, which maintained wet 

conditions and again elevated streamflows in the region. Wet 

conditions continued through late March with another storm 

that brought the largest pulse of rain of about 7 to 9 inches on 

the 29th and 30th. The additional rain resulted in peak stream 

stages and flows that generally greatly exceeded the earlier 

March stages and flows. 

Overall, the total rainfall at the five NWS stations 

(fig. 3) from late February through March ranged from about 

19 to 25 inches, which is unprecedented in the past 100-year 

weather history, especially during the cool season when 

moisture losses to evaporation are low. Rainfall during this 

period represents about half the total annual precipitation, 

which is relatively evenly distributed throughout the year. The 

total rainfall during February and March 2010 in southeastern 

New England (fig. 2) indicates the highest amounts occurred 

from southeastern Connecticut and southern Rhode Island 

northward along the southern New England coast. The area of 

high rainfall in northeastern Massachusetts and northward was 

about equal to the total rainfall in southeastern Massachusetts 

and Rhode Island, but flooding was less severe in northeastern 

Massachusetts because a greater portion of the total rainfall in 

this region occurred in late February when water storage was 

more available. 

Streamflows

Peak stages and flows recorded at USGS streamgages in 

Rhode Island and southeastern Massachusetts (table 1) indicate the magnitude of the March–April 2010 flood relative to 

the magnitude of past floods over the period of the streamgage 

record. The 2010 stage and flow data are provisional until the 

entire segment of streamflow record is analyzed and approved. 

Waiting for the approval of the 2010 streamflow data would 

cause undue delays for this report. Approval of the data was 

not considered necessary for the primary objective of documenting the elevation of the flood high water. However, the 

data on peak stage and flow were reviewed and are considered 

to be in good condition for use in this report. 

 Of the 25 streamgages listed in table 1, the March–

April 2010 flood set new peak stage and flow records at 

all streamgages except Wading River near Norton, MA 

(01109000), which was within about 10 percent of the 

peak record, and the Blackstone River Basin streamgages 

(01111300, 01111500, 01112500) with the exception of the 

relatively new streamgage on the Blackstone River near 

Uxbridge, MA (01111212). The flood peak occurred at the 

end of March or the beginning of April for all streamgages 

listed in table 1. The increase in peak flows from the previous 

peak of record at the streamgages (excluding Wading River 

and the Blackstone River Basin streamgages) ranged from 

about 2 to 275 percent with median increase of 88 percent. 

The streamgage records indicate that the largest increase in 

the record peak flow was in the upper Pawcatuck River Basin, 

including the Wood River Basin and neighboring basins to the 

north and east, including the Hunt River Basin, the mainstem 

of the Pawtuxet River, and the South Branch of the Pawtuxet 

River (fig. 1). 

The mid-March peak and the peak around March 24–25 

would have been annual peak had more rainfall not occurred. 

At five streamgages these peaks exceeded the previous peak 

of record (01117430, 01117800, 01115098, 01116000, and 

01108000; table 1) and were within about 20 percent of the 

peak of record at five other streamgages (01117420, 01117468, 

01118000, 01115187, and 01116500; table 1). The magnitude of these secondary peaks and the duration of high water 

reflect the severity of the flood conditions in the area. Unlike 

HWMs identified in many river reaches in central and eastern 

Massachusetts that were confounded by mid-March peaks 

that equaled or exceeded the late March–early April peaks 
4 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

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68138

67958

65910

63456

63420

279278

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275712

273658 274234

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199923

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198793

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197627

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275629 273055

Massachusetts

Connecticut Rhode

Island

New Hampshire

Vermont

72°30' 72° 71°30' 71° 70°30'

42°30'

42°

41°30'

National Weather Service Station

and identification number (COOPID) 376698 High: 25.4

Low: 8.7

Precipitation, in inches

EXPLANATION

Total rainfall map created by linear radial interpolation with 

constant trending of point data from National Weather 

Service stations. Note some of the stations used are 

outside the map extent. 

!

0 5 10 MILES

0 5 10 KILOMETERS

Figure 2. Total rainfall during February and March 2010 in southeastern New England.
Methods 5

0

2

4

6

8

0

5

10

15

20

25

30

North Foster 1E (375270)

Woonsocket (379423)

Tiverton (377581)

T.F. Green AP (376698)

Kingston (374266)

2/1 2/8 2/15 2/22 3/1 3/8 3/15 3/22 3/29

2010

PRECIPITATION, IN INCHES

A. Daily Rainfall

B. Cumulative Daily Rainfall

Figure 3. Daily rainfall (A) hyetographs and (B) cumulative totals during February and March 2010 at five National 

Weather Service stations (NWS) in Rhode Island. Number in parenthesis is the NWS COOPID shown in figure 2.

(Zarriello and Bent, 2010), the HWMs in Rhode Island are distinctly identified by late March–early April peak that greatly 

exceeded the earlier peaks. 

Flow conditions in the region prior to the March floods 

are illustrated by the daily mean flow for the 2010 water 

year in relation to the 10th-, 25th-, 50th-, 75th-, and 90thpercentile flows for a given day, calculated from the periodof-record daily mean flows at Hunt River near East Greenwich 

(01117000) and Wood River at Hope Valley (01118000) 

(fig. 4A and 4B, respectively). Note that these streamgages 

were established in 1939 and 1940, respectively. Prior to the 

late February rainfall, flows were below the median (50th 

percentile) but quickly rose well above the 90th percentile following the late February rainfall. Flows that exceeded the 90th 

percentile occurred only 10 percent of the time at this time of 

year, which is the normal seasonal high-flow period. Flows 

receded to about the median range in early March, then rose 

sharply following the mid-March rains and again following the 

mid–late March rains that set a new peak flow for water year 

2010. Flows continued to stay above the 90th percentile in late 

March because of saturated conditions and additional rainfall. 

Another large rainfall event at the end of March caused a rise 

in streamflow that exceeded earlier peaks and set new period 

of record peaks at most streamgages in Rhode Island. 

Methods 

HWMs are the evidence of the highest water levels 

during a flood (Benson and Dalrymple, 1967). There are 

many types of HWMs, but most are left by vegetative debris 

stranded at the highest water elevation. The best HWMs are 

small seeds or floating debris that adhere to smooth surfaces or 

lodge in tree bark that forms a distinct water line. Stain lines 

on buildings, fences, and other structures also provide excellent marks. HWMs are best identified immediately following 

the peak stage as time and weather (wind and rain) fade the 
6 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1. Summary of March–April 2010 flood peak stage and flow data at selected U.S. Geological Survey streamgages in Rhode Island and southeastern Massachusetts.—Continued [Locations shown on figure 1; mi2, square miles; ft feet; ft3/s, cubic feet per second; numbers in bold indicate new peak of record] Station number Station name Drainage area (mi2

)

Start 

of 

record

March – April 2010 peakb Recorded peak prior to March–April 2010 flood Secondary peakb March–April 2010

Date

Gage 

height 

(ft)

Discharge 

(ft3/s) Date

Gage 

height 

(ft)

Discharge 

(ft3/s) Date

Gage 

height 

(ft)

Discharge 

(ft3/s)

BLACKSTONE RIVER BASIN

01111212 Blackstone River, Rt 122 Bridge near Uxbridge, MA 244 2006 03/31 19.56 7,310 04/17/2007 18.44 6,420 03/15 16.77 5,17001111300 Nipmuc River near Harrisville, RI 16.0 1965 03/30 8.29 2,230 04/16/2006 9.44 3,900 03/14 7.59 1,38001111500 Branch River at Forestdale, RI 91.2 1940 03/31 12.05 5,260 10/15/2006 13.09 6,290 03/14 8.95 2,64001112500 Blackstone River at Woonsocket, RI 416 1929 03/31 14.50 14,900 08/19/1955 21.80 32,900 03/15 10.29 8,280

HUNT RIVER BASIN

01117000 Hunt River near East Greenwich, RI 22.9 1940 03/30 5.61 2,420 10/15/2005 4.71 1,680 03/24 3.12 671

MOSHASSUCK RIVER BASIN 

01114000 Moshassuck River at Providence, RI 23.1 1963 03/30 6.26 1,600 03/18/1968 4.34 1,220 03/24 4.61 729

PAWCATUCK RIVER BASIN

01117350 Chipuxet River at West Kingston, RI 9.59 1973 03/31 9.78 688 10/16/2005 8.07 306 03/24 7.39 22201117370 Queen River at Liberty Rd at Liberty, RI 19.6 1998 03/30 8.44 2,760 10/15/2005 6.08 919 03/14 5.38 59101117420 Usquepaug River near Usquepaug, RI 36.1 1976 03/31 11.16 2,950 06/06/1982 9.23 1,060 03/15 7.91 86301117430 Pawcatuck River at Kenyon, RI 72.7 2002 04/01 7.21 2,510 04/17/2007 3.54 885 03/25 4.05 1,08001117468 Beaver River near Usquepaug, RI 9.22 1974 03/30 6.41 1,390 06/06/1982 3.95 370 03/14 3.94 31101117500 Pawcatuck River at Wood River Junction, RI 100 1940 03/31 11.16 3,490 06/07/1982 8.75 1,860 03/25 6.42 1,28001117800 Wood River near Arcadia, RI 35.2 1964 03/30 10.56 2,660 03/18/1968 8.64 896 03/14 8.45 1,08001118000 Wood River at Hope Valley, RI 72.4 1941 03/30 13.72 5,470 06/06/1982 10.26 2,390 03/14 8.89 1,89001118500 Pawcatuck River at Westerly, RI 295 1940 03/30 15.38 9,330 06/06/1982 12.86 7,070 03/24 9.35 4,000
Methods 

7

Table 1. Summary of March–April 2010 flood peak stage and flow data at selected U.S. Geological Survey streamgages in Rhode Island and southeastern Massachusetts.—Continued[Locations shown on figure 1; mi2, square miles; ft feet; ft3/s, cubic feet per second; numbers in bold indicate new peak of record]

Station 

number Station name

Drainage 

area

(mi2)

Start 

of 

record

March – April 2010 peakb Recorded peak prior to March–April 2010 flood Secondary peakb March–April 2010

Date

Gage 

height 

(ft)

Discharge 

(ft3/s) Date

Gage 

height 

(ft)

Discharge 

(ft3/s) Date

Gage 

height 

(ft)

Discharge 

(ft3/s)

PAWTUXET RIVER BASIN

01115098 Peeptoad Brook at Elmdale Rd near North Scituate, RI 4.83 1994 03/30 2.55 249 10/20/1996 2.48c 180 03/14 2.43 19101115187 Ponaganset River at South Foster, RI 14.4 1994 03/30 6.57 1,330 06/30/1998 6.37 1,200 03/14 6.04 1,00001116000 South Branch Pawtuxet River at Washington, RI 62.8 1940 03/31 9.22 5,280 06/06/1982 5.30 1,980 03/15 5.4 2,08001116500 Pawtuxet River at Cranston, RIa 200 1939 03/31 20.79 14,100 06/07/1982 14.50 5,440 03/15 14.98 5,380

TAUNTON RIVER BASIN

01108000 Taunton River near Bridgewater, MA 261 1930 04/01 14.97 5,480 03/20/1968 14.48 4,980 03/17 14.51 5,23001109000 Wading River near Norton, MA 43.3 1926 03/30 11.48 1,310 03/19/1968 11.47 1,460 03/15 9.93 78601109060 Threemile River at North Dighton, MA 84.3 1967 03/31 8.98 2,930 06/16/1998 8.89 2,870 03/16 7.23 1,84001109070 Segreganset River near Dighton, MA 10.6 1967 03/30 8.66 1,010 03/18/1968 7.69 867 03/15 5.70 426

TEN MILE RIVER BASIN

01109403 Ten Mile River at East Providence, RI 53.1 1987 03/31 10.79 2,250 10/16/2005 10.00 1,900 03/15 7.36 975

WOONASQUATUCKET RIVER BASIN 

01114500 Woonasquatucket River at Centerdale, RI 38.3 1941 03/30 9.00 1,750 10/15/2005 8.26 1,530 03/14 4.71 651

a Streamflow affected by regulation.bGage height and discharge may change pending further analysis of entire water-year record.c Peak gage height is from July 1, 1998, as a result of backwater from Scituate Reservoir.
8 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

A. Hunt River near East Greenwich, RI (01117000)

10

100

1,000

10,000

90th

75th

50th

25th

10th

2010 daily mean flow

(provisional)

Flow percentile

EXPLANATION

Period of statistical record October 1939 through September 2009

1

B. Wood River at Hope Valley, RI (01118000)

FLOW, IN CUBIC FEET PER SECOND

OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT.

10

100

1,000

10,000

Period of statistical record October 1940 through September 2009

Figure 4. Period-of-record daily mean flow percentiles and 2010 daily mean flow at (A) Hunt River near East Greenwich (01117000) 

and (B) Wood River at Hope Valley (01118000), Rhode Island. Location shown in figure 1.
Methods 9

evidence of the peak-water line. Additionally, care was taken 

to identify HWMs farthest from the main channel as possible 

where velocities are generally small and pileup or drawdown’s 

common in fast moving waters are best avoided. The general 

methods used to identify and document HWMs are described 

by Benson and Dalrymple (1967).

Setting High-Water Marks

USGS field crews consisted of at least one person experienced in identifying HWMs. Crews would identify HWMs 

and corroborating evidence of surrounding HWMs. The corroborating information became more important as the quality 

of the HWM decreased. After a satisfactory HWM was found, 

a more permanent identification mark was established, such 

as a disk, stake, chisel mark, pen line or paint line (examples 

shown in fig. 5). Flagging, written descriptions, sketches, 

photos, and handheld Geographic Position System (GPS) horizontal position measurements were made so the marks could 

be found later and surveyed to a standard vertical datum or for 

other analysis, such as determination of the flood profile over 

the river reach.

 Identification of HWMs by the USGS began on April 2 

and continued through April 7, 2010, by up to six field crews 

on a given day. Most of the HWMs were determined from 

April 5–7, when five or six crews were deployed. In the first 

2 days, April 2–3, only one and two crews were deployed, 

respectively, because of outstanding streamgaging activities related to the flood. The HWMs generally were of good 

quality because they were obtained soon after the flood peak. 

Dates and other supporting information on HWMs obtained 

by the USACE were not noted in the summary spreadsheet 

or in limited field notes supplied by the USACE. Christopher 

Hatfield (USACE, oral commun., 2011) indicated the USACE 

HWMs were obtained from April 3–7.

Elevation of High-Water Marks

Elevation of HWMs were later surveyed to a standard 

vertical datum (NAVD 88) using the Global Navigation Satellite System (GNSS) and survey-grade GPS receivers along 

with standard optical-surveying equipment. The GPS surveys 

were conducted using four Trimble R8 receivers that support the L1 and L2 signals; two of the receivers also support 

GLONASS L2C and L5 signals. At each HWM site a temporary survey point (PK) was established in an open area to provide the best possible satellite reception. For each PK, the GPS 

receiver was initialized away from the PK and then positioned 

over the PK. This procedure was repeated by reinitializing the 

GPS unit (flipping the unit upside down for several seconds 

to lose the GPS signals) to obtain an independent reading. If 

the vertical elevation of the PK differed by more than about 

0.10 ft, the procedure was repeated until an acceptable agreement was reached. Elevation of repeated PK measurements 

generally agreed to within 0.05 ft. Standard optical surveying 

equipment was then used to tie the HWM to the PK elevation 

using a closed-loop survey. Ninety-eight percent of the 291 

loop surveys closed to within 0.01 ft or less, 2 percent closed 

to within 0.02 ft. 

Continuous real-time differential corrections to the GPS 

horizontal and vertical positions were made using a proprietary fixed-base station GPS network operated by KeyNetGPS, 

Inc. The network and associated software determine corrections for satellite signals received by the field GPS receiver 

for ionosphere and other atmospheric disturbances recorded 

at three or more of the closest fixed-base stations relative to 

the position of the field GPS receiver. The fixed-base stations 

receivers continuously stream data to a central server that calculates corrections at the location of the field GPS receiver in 

real time. The Trimble GPS field controllers require version 12 

controller software to utilize the fixed network. The fixed-station network in the Rhode Island region, nearest the HWMs, 

consists of five stations (fig. 6)—Providence, RI (NBC1), Fall 

River (ABL1), Framingham (KP16), Boston (KP19), MA, 

and Norwich, CT (MTG1). Quality-assurance GPS measurements were made at 29 National Geodetic Survey (NGS) 

bench marks (BMs) with vertical datum throughout the study 

area (fig. 6). The elevation of the GPS measured BMs yielded 

a vertical root mean square error (RMSE) of 0.09 ft (table 2). 

The accuracy of the HWM survey meets the standards specified by FEMA (2003) in Guidelines and specifications for 

flood hazards mapping partners, Appendix A: Guidance for 

aerial mapping and surveying.

Elevations of 87 USGS HWMs were initially surveyed 

with a Leica system 1200 (GX1220) GPS that uses a temporary GPS base station to make baseline corrections for atmospheric and ionosphere disturbances to the rover GPS unit. 

Most of these HWM elevations (75) were resurveyed with the 

Trimble GPS with the exception of 6 HWMs that were found 

destroyed and 6 that had been surveyed during the initial 

HWM work and would likely be difficult to find because of 

limited field notes. The Leica GPS survey work was redone 

to the extent possible because check measurements with the 

Trimble GPS yielded inconsistent results. Of the 75 HWMs 

that were surveyed using the Leica and Trimble GPS systems, 

the elevation of HWMs determined with the Leica GPS had 

a mean and median difference of -0.11 ft and ranged from 

0.20 to -0.68 ft different from the elevation determined with 

the Trimble GPS. The elevations determined using the Trimble 

GPS survey are reported, where possible, because more 

ground-truth information was obtained, and the atmospheric 

and ionosphere corrections were considered more accurate. 

The USACE surveyed 41 out of the 144 HWMs identified as part of their initial effort to identify high-water levels. 

The HWMs surveyed by USACE used survey-grade Leica 

GPS equipment that uses a temporary base GPS station and a 

rover GPS unit to make baseline corrections for atmospheric 

and ionosphere disturbances. The control information appears 

to be limited to two NGS bench marks. The HWMs were 

not resurveyed by the USGS because of difficulty finding 

USACE HWMs, which were generally limited to horizontal 

position coordinates. 
10 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

Ashaway River (Ash-20.1)

Pawtuxet River (500310)

Pawcatuck River (500904)

Woonasquatucket River (WR-2-2.1)

Figure 5. Examples of high-water mark debris lines on trees and structures following the March–April 2010 floods in Rhode Island. 

Value in parentheses refers to the HWM_ID in appendix table 1-1. 
Methods 11

Atlantic Ocean

MASSACHUSETTS

CONNECTICUT

MOSHASSUCK

WOONASUATUCKET

BLACKSTONE

BRANCH

PAWCATUCK 

HUNT

PAWTUXET

MTG1 ABL1

KP16 KP19

NBC1

0 10 MILES

0 2 64 8 10 KILOMETERS

2 64 8

72° 71°30' 71°

42°

41°30'

Fixed base-station network for 

Global Positioning System (GPS) 

contol and identifier

National Geodetic Survey (NGS) 

bench-mark control point

Base from Rhode Island Geographic Information System; State boundary, 1:24,000, 1989;

Hydrolines 1,24,000, 1998; Lakes and Ponds, 1:24,000, 1989; Basins, 1:24,000,1990;

Polyconic projection. North American Datum of 1983;

Rhode Island State Plane coordinate system mainland zone 1998

HUNT

EXPLANATION

U.S. Army Corps of Engineers

U.S. Geological Survey (USGS)

Basin boundary and name

Subbasin boundary

High-water mark established by:

KP16

Figure 6. Fixed-based station Global Positioning System receiver network and National Geodetic Survey bench-mark control 

points used in the determination of the elevation of the March–April 2010 flood high water in Rhode Island. 
12 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

Table 2. Summary of Global Positioning System (GPS) measurements made to National Geodetic Survey (NGS) bench marks.

[PID, NGS identification; EAST and NORTH, horizontal position referenced to North American Datum of 1983 (NAD 83), in feet; ELEV(88), vertical reference to North American Datum of 1988 (NAVD 88), in feet; OFFSET, GPS point offset from bench mark to obtain the best quality signal; DELTAS, difference 

between published and surveyed values, in feet; –, not determined; RMSE, Root Mean Square Error, in feet]

PID Published by NGS Surveyed by GPS OFFSET

(feet)

Deltas

EAST NORTH ELEV(88) EAST NORTH ELEV(88) EAST NORTH ELEV(88)

LW1207 290,212.264 323,557.039 445.08 290,212.437 323,557.217 445.140 0.00 0.17 0.18 0.06

MY6203 310,892.869 335,656.078 243.29 310,882.757 335,646.307 241.788 1.63 – – 0.13

LW1892 292,989.929 201,602.231 434.8 292,989.792 201,602.270 434.671 0.00 -0.14 0.04 -0.13

LW1141 – – 83.45 268,925.367 154,707.535 83.590 0.00 – – 0.14

LW0771 – – 55.49 279,430.066 132,676.297 55.790 -0.36 – – -0.06

LW1347 – – 202.54 310,850.487 235,538.720 200.180 2.26 – – -0.10

LW1453 – – 314.4 282,621.512 256,357.091 321.464 -7.15 – – -0.09

LW0111 – – 32.60 339,853.707 205,684.041 32.539 0.00 – – -0.06

LW1641 – – 36.51 346,542.753 246,432.034 36.418 0.00 – – -0.09

LW0316 – – 64.77 358,095.657 297,277.180 64.631 0.00 – – -0.14

LW0949 – – 79.68 250,252.691 125,495.235 76.660 3.00 – – -0.02

LW0163 – – 23.35 351,839.553 270,472.909 20.368 2.90 – – -0.09

LW1424 – – 289.10 301,519.936 225,959.068 289.159 0.00 – – 0.06

LW0750 – – 19.77 237,223.597 108,644.453 15.264 4.52 – – 0.01

LW1022 – – 136.89 311,742.468 146,171.612 136.960 0.00 – – 0.07

LW0121 – – 23.04 341,073.675 224,402.591 25.781 -2.82 – – -0.08

LW1204 – – 415.63 286,033.511 316,574.751 414.916 0.73 – – 0.02

LW0445 – – 211.42 333,815.001 268,562.117 211.436 0.00 – – 0.02

LW1464 – – 201.31 325,530.807 292,335.225 193.683 7.51 – – -0.12

LW0165 – – 41.17 353,039.393 276,507.026 38.895 2.17 – – -0.11

LW1027 – – 117.63 293,017.509 149,091.060 117.652 0.00 – – 0.02

LW0410 – – 112.84 330,259.121 284,989.079 112.425 0.32 – – -0.09

LW0085 – – 80.24 330,604.679 185,688.068 80.192 0.00 – – -0.05

LW1029 – – 173.96 289,483.622 151,846.597 173.834 0.00 – – -0.13

LW0440 – – 53.08 344,755.447 266,854.500 53.092 0.00 – – 0.01

LW1211 – – 301.69 295,992.778 327,273.661 301.751 0.00 – – 0.06

LW1435 – – 302.35 306,323.441 245,229.788 299.566 2.83 – – 0.05

LW0774 – – 66.03 288,483.352 132,983.684 63.207 2.67 – – -0.15

LW1430 – – 328.95 325,556.259 254,358.123 320.180 8.81 – – 0.04

RMSE 0.09
Summary 13

Summary of High-Water Marks 

Identified

High-water marks were identified along five major 

river corridors including the Blackstone, Hunt, Moshassuck, 

Pawtuxet, and Woonasquatucket Rivers and in many tributaries to these rivers by the USGS and the USACE following the 

March–April 2010 flood (fig. 1; table 3). The USGS identified 276 HWMs at 137 sites (a site may have more than one 

HWM, typically a bridge crossing with HWMs identified on 

the upstream and downstream sides from the bridge), which 

are listed in the appendix table 1-1. Field notes indicate some 

sites were visited, but no suitable HWM could be found; 

these sites were not tracked and were not entered into the 

spreadsheet. Of the 276 HMWs, 6 were found destroyed and 

no elevation could be obtained. Another six HWMs were also 

found destroyed during the later GPS survey but had been 

previously surveyed (USGS-73, USGS-74, USGS-111, USGS119a, USGS-132, USGS-168). The previously surveyed elevations are reported in table 1-1. Six HWMs identified along 

the Pocasset River (USGS-182a through USGS-182f) during 

the initial GPS survey were not resurveyed but are reported 

in table 1-1. One HWM (USGS-21) was not found during the 

GPS survey but is reported in table 1-1 without an elevation. 

In total, of the 276 HWMs identified by the USGS, the elevation is reported for 269 HWMs. 

The USACE identified 144 HWMs at 127 sites, which are 

listed in the appendix, table 1-2. Note the number of sites was 

determined from horizontal position information because the 

descriptive information was limited and the number of sites 

could be more or less than estimated. Forty-three of the 144 

HWMs were previously surveyed by the USACE and were not 

resurveyed by the USGS. Seventeen of the 144 HWMs were 

not found and 9 were destroyed; 75 HWMs were surveyed 

by the USGS. In total, of the 144 HWMs identified by the 

USACE, the elevation is reported for 118 HWMs. 

The HWMs identified by the USGS and USACE covered about 170 river miles, as determined from the upstream 

and downstream HWMs along river reaches, which is about 

equally divided by river miles covered by USGS and USACE, 

respectively. The density of HWMs per mile of river reach for 

USGS HWMs ranges from a lower quartile of about 2.0 to an 

upper quartile of about 4.2, with a median of about 3.0 HWMs 

per mile. The density of USACE HWMs ranged from a lower 

quartile of about 1.0 to an upper quartile of about 2.0, with a 

median of 1.5 HWMs per mile. 

The elevation of USGS HWMs upstream from bridges 

at 65 locations were, on average, about 1.9 ft higher than the 

downstream HWMs near the same bridge; near 8 bridges, 

HWMs at the upstream elevation were lower than the downstream elevation (these sites were not included in the average elevation difference between upstream and downstream 

HWMs). HWMs higher at the downstream side than upstream 

side were attributed to the quality of the water mark, which is 

often reflected in the rating of the HWM for marks identified 

by USGS. 

Potential Use of High-Water Data 

HWMs provide critical information on inundation following a flood. Mapping flood inundation is greatly enhanced 

by the availability of LIDAR (LIght Detection and Ranging) 

elevation data, which provides a high level of precision and 

accuracy (Gesch, 2009). As part of the American Recovery 

and Reinvestment Act of 2009, a comprehensive LIDAR mapping program was begun in the summer of 2010 to map the 

coastal northeast (fig. 7) at a 2-meter resolution and a vertical 

accuracy of 15 cm (Smith and others, 2010).The LIDAR data 

generated by this program are not expected to be completed 

until the fall of 2011. When the LIDAR data become available, 

the HWM elevations determined in this study can be used to 

define the extent and depth of flooding in the selected reaches. 

The new LIDAR data are expected to provide complete coverage of Rhode Island.

Summary

A series of widespread, large, low-pressure systems in 

southern New England in late February and in mid- through 

late March resulted in record, or near record, amounts of 

rainfall. The late February storm dropped nearly 5 inches of 

rain over the region that primed conditions for triggering high 

water that followed the 4 to 7 inches of rain that fell between 

March 13 and 15, 2010. As flood waters began to recede, 

2 to 5 inches of rain fell on March 22–23, maintaining wet 

conditions and elevating streamflows over the region. This 

was followed by another storm on March 29–30 that brought 

an additional 7 to 9 inches of rain, which compounded with 

the low moisture losses to evaporation during the cool season 

further elevated streamflows. The total rainfall in Rhode Island 

from late February to the end of March 2010 ranged from 

about 19 to 25 inches, which is unprecedented in the past 100-

year weather history.

Record total rains during late February and March 

resulted in peak stream stages and flows that set new periodof-record peaks at 21 of 25 streamgages in Rhode Island 

and southeastern Massachusetts. The highest record peaks 

occurred in late March–early April and generally greatly 

exceeded the earlier March peaks that were near or exceeded 

the previous record peak flows at 10 of the 25 streamgages. 

Following the late February rains, streamflow at two long-term 

streamgages, Hunt River near East Greenwich (01117000) and 

Wood River at Hope Valley (01118000), rose well above the 

90th flow percentile, receded, then rose well above the 90th 

percentile again following rains in mid-March, between midand late March, and late March. Flows remained above the 

90th flow percentile during this normally seasonal high flow 

period until about mid-April. 
14 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 3. Summary of high-water marks (HWMs) established by the U.S. Geological Survey (USGS) and the U.S. Army Corps of Engineers (USACE) following the March–April 2010 floods in Rhode Island. [Locations, number of unique locations where HWMs were identified such as upstream and downstream from a bridge; Length, approximate reach length between the most upstream and downstream HWMs; Bk, brook; Br, Branch; HWMs and basin locations are shown in figure 1] By USGS By USACE Basin River Number of Length (miles) Basin River Number of Length (miles) HWMs Locations HWMs Locations Hunt 14 6 4.6 Blackstone 15 14 16 Hunt/Scrabbletown Bk 2 1 0 Branch 15 15 8.8 Frenchtown Bk-Hunt 1 1 0 Stingo Bk 2 2 1.1 Sand Hill Bk 3 2 0.7 Dry Arm Bk 1 1 0 Pawtuxet 40 13 5.8 Clear 7 7 6 North Br Pawtuxet 22 9 5.2 Herring Bk 1 1 0 Situate Tribs 18 14 0 Chepachet 1 1 0 Pocasset 32 17 9.1 Moshassuck 23 20 8.8 Simmons Bk 3 2 0.06 Pawcatuck 1 1 0 Furnace Hill Bk 5 2 0.05 Meadow Bk 4 4 2.6 Big 1 1 0 Beaver 7 6 8.5 Pawcatuck 40 19 28 Queen 5 2 0 Queen 12 7 6.8 Wood 11 10 15 Usquepaug 6 3 2.6 Bushy Bk 1 1 0 Ashaway 7 4 2.3 Pawtuxet 12 11 3.4 Green Falls 2 1 0 South Br Pawtuxet 19 18 8.1 Beaver 3 2 Big 4 3 2.7 Chipuxet 9 6 5.2 Flat 5 2 2.4 Tomaquag 7 3 3.4 Congdon 5 3 5.4 Wood 1 1 Nooseneck 1 1 0 Woonasquatucket 48 23 9.4 Quidneck Bk 1 1 0

McCuster Bk 1 1 0Whaley Bk 1 1 0Hawkinson Bk 1 1 0

Total 276 137 83 144 127 89
Summary 15

VERMONT NEW HAMPSHIRE

NEW YORK

From http://mapserver.maine.gov/lidar/usgs_arra_proposal.pdf

EXPLANATION

LIDAR data planned for aquistion in 2010–2011

Existing LIDAR data

FEMA planned LIDAR data aquistion in 2010–2011

Figure 7. Areas of availability of LIght Detection and Ranging (LIDAR) data and projected 2011 LIDAR data in 

Rhode Island and adjacent states.
16 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

High-water marks (HWMs) were identified by the USGS 

from April 2–7, 2010, and by the USACE from April 3–7, 

2010. The elevation of HWMs were later determined to a standard vertical datum (NAVD 88) using the Global Navigation 

Satellite System and survey-grade Global Positioning System 

(GPS) receivers along with standard optical-surveying equipment. Differential corrections to the GPS positions were made 

using a proprietary fixed-base station network or temporary 

base station. Quality-assurance GPS measurements made at 

29 National Geodetic Survey bench marks with vertical datum 

throughout the study area yielded a vertical root mean square 

error of 0.09 feet. 

HWMs following the March–April 2010 flood were 

obtained in five major river corridors including the Blackstone, Hunt, Moshassuck, Pawtuxet, and Woonasquatucket 

and along many of the main tributaries to these rivers. The 

USGS identified 276 HWMs at 137 sites. A site may have 

more than one HWM, typically a bridge crossing with HWMs 

identified on the upstream and downstream sides of the bridge. 

The USACE identified 144 HWMs at 127 sites. The HWMs 

identified by the USGS and USACE covered about 170 river 

miles, as determined from the upstream and downstream 

HWMs along a reach. 

Acknowledgments

Identification of HWMs was made by USGS personnel 

from Water Science Centers in Massachusetts–Rhode Island 

(Robert Breault, Mark Nimiroski, Gene Parker, Lance Ransby, 

and Andy Waite), Maine (Pamela Lombard, Nicholas Stasulis, and Greg Stewart), and New York (Loyd Brook, Gary 

Firda, and Carolynn Szabo). HWMs identified and surveyed 

by USACE were supplied by Christopher Hatfield, Richard 

Loyd, and Gary Strangeland. Survey of HWMs was made by 

personnel from USGS Water Science Centers in Massachusetts–Rhode Island (Jean Campbell, Paul Friesz, Andy Massey, 

Timothy McCobb, Lance Ostiguy, and Andy Waite) and Ohio 

(Carrie Huitger, Chad Ostheimer, and Matthew Whitehead).

References Cited

Benson, M.A., and Dalrymple, Tate, 1967, General field and 

office procedures for indirect discharge measurements: U.S. 

Geological Survey Techniques of Water-Resources Investigations, book 3, chap. A1, 30 p.

FEMA–Federal Emergency Management Agency 

FEMA, 2003, Guideline and specifications for flood hazard 

mapping partners, Appendix A: Guidance for aerial mapping and surveying, Federal Emergency Management 

Agency, 59 p., accessed August 6, 2010, at http://www.fema.

gov/library/viewRecord.do?id=2206

Gesch, D.B., 2009, Analysis of Lidar elevation data for 

improved identification and delineation of lands vulnerable to sea-level rise: Journal of Coastal Research, SI 53, 

p. 49–50, available at http://topotools.cr.usgs.gov/pdfs/

jcr_gesch_SI53.pdf

Northeast Regional Climate Center, 2010, New England Climate, March 2010, v. 110, no. 3, accessed July 26, 2010, at 

http://www.nrcc.cornell.edu/pubs/msmry_ne_2010-03.pdf

Smith, Michael; Rubin, Fay; Jacqz, Christian; White, Shane; 

Varney, Michael; and Ruhren, Tim, 2010, Lidar for the 

northeast, Maine Office of GIS, 109 p., accessed August 25, 

2010, at http://mapserver.maine.gov/lidar/usgs_arra_proposal.pdf

Zarriello, P.J., and Bent, G.C., 2010, Elevation of the March–

April 2010 flood high water in selected river reaches in 

central and eastern Massachusetts: U.S. Geological Survey 

Open File Report 2010–1315, 36 p., online at http://pubs.

usgs.gov/of/2010/1315/
Appendix 1
18 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

Appendix 1. High-water marks identified by the U.S. Geological Survey and the 

U.S. Army Corps of Engineers

Note, most of the information contained in the tables can be obtained electronically in a geographical information system format 

(shape file) at http://pubs.usgs.gov/ofr/2011/1029/.

• Table 1-1. High-water marks identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode 

Island.

• Table 1-2. High-water marks identified by the U.S. Army Corps of Engineers (USACE) following the March–April 

2010 flood in Rhode Island.
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 19

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-1 ASH-Lau Ash-21.1 PJL,ALU 41.423 -71.791 04/06/2010 Ashaway River Laurel St, Brdg 50 US 01118360 

disc.

G Chisel

R 37.22

USGS-2 ASH-Lau Ash-21.2 PJL,ALU 41.424 -71.792 04/06/2010 Ashaway River Laurel St, Brdg 50 DS 01118360 

disc.

G Disk

R 35.90

USGS-3 ASH-Lau2 Ash-20.1 PJL,ALU 41.424 -71.790 04/06/2010 Ashaway River Rt 216 & Laurel St DS

E Pencil u 39.43

USGS-4 ASH-Lau2 Ash-20.2 PJL,ALU 41.424 -71.790 04/06/2010 Ashaway River Rt 216 & Laurel St DS

G Pencil u 39.59

USGS-5 ASH-Rt216 Ash-19.1 PJL,ALU 41.425 -71.790 04/06/2010 Ashaway River Rt 216 (Ash 19.1)

G Pencil

R 44.81

USGS-6 ASH-Wel Ash-18.1 PJL,ALU 41.438 -71.790 04/06/2010 Ashaway River Wellstown Rd Brdg 49 DS

U Disk

R 49.79

USGS-7 ASH-Wel Ash-18.2 PJL,ALU 41.438 -71.790 04/06/2010 Ashaway River Wellstown Rd Brdg 49 US

G Chisel

L 51.89

USGS-8 BEAV-Hil Hill-DSH1 GJS, MTN 41.526 -71.639 04/06/2010 Beaver River Hillsdale Rd. DS

G Disk

L 224.11

USGS-9 BEAV-Hil Hill-USH2 GJS, MTN 41.526 -71.639 04/06/2010 Beaver River Hillsdale Rd. US

G Disk

L 232.47

USGS-10 BEAV-138 US138 GJS, MTN 41.493 -71.628 04/06/2010 Beaver River 01117468 Rt 138 (Usquepaugh Rd) F Disk

R 114.48

USGS-11 CHIP-Cam CR-3-3.1 GDF, LRR 41.539 -71.521 04/06/2010 Chipuxet River Camp Rd. Brdg

E Nail

R 135.93

USGS-12 CHIP-Ind CR-4-4.1 GDF, LRR 41.530 -71.518 04/06/2010 Chipuxet River Indian Corner Rd. Brdg DS F Hub

R 126.04

USGS-13 CHIP-Ind CR-4-4.2 GDF, LRR 41.530 -71.518 04/06/2010 Chipuxet River Indian Corner Rd. Brdg US F Hub

R 124.88

USGS-14 CHIP-Yaw CR-5-5.1 GDF, LRR 41.518 -71.526 04/06/2010 Chipuxet River Yawgoo Valley Rd. Brdg US

E Nail

R 112.40

USGS-15 CHIP-Yaw CR-5-5.2 GDF, LRR 41.518 -71.525 04/06/2010 Chipuxet River Yawgoo Valley Rd. Brdg DS F u L 109.90USGS-16 CHIP-Wol CR-6-6.1 GDF, LRR 41.506 -71.531 04/06/2010 Chipuxet River Wolf Rocks Rd. Brdg US

E Pen

L 102.12

USGS-17 CHIP-Wol CR-6-6.2 GDF, LRR 41.506 -71.531 04/06/2010 Chipuxet River Wolf Rocks Rd. Brdg DS

E Pen

L 102.06

USGS-18 CHIP-138 CR-7-7.1 GDF, LRR 41.483 -71.551 04/06/2010 Chipuxet River Hwy 138 Brdg US (gage DS)

E Nail

R 96.36

USGS-19 CHIP-138.2 01117350-1 GJS, MTN 41.483 -71.551 04/06/2010 Chipuxet River Sta 01117350 Rt 138

G Chisel

R 98.18

USGS-20 1115280 01115280 GJS, MTN 41.804 -71.650 04/05/2010 Cork Brook Sta 1115280 Rockland Rd

G Disk

R 418.95

USGS-21 1115190 01115190-1 GJS, MTN 41.822 -71.700 04/05/2010 Dolly Cole Brook Sta 01115190 Rt 6

G u R NF

USGS-22 1115190 01115190-2 GJS, MTN 41.822 -71.700 04/05/2010 Dolly Cole Brook Sta 01115190 Rt 6 F Disk

R 353.78

USGS-23 500502 500502 RFB, GJS 41.630 -71.479 04/07/2010 Frenchtown BkHunt R 01116905 Hunt River

U None

R 35.18

USGS-24 60-100 60-100-DS1 GJS, GCB 41.756 -71.488 04/03/2010 Furnace Hill Brook Phenix Rd Brdg DS F Disk

R 64.21

USGS-25 60-100 60-100-US1 GJS, GCB 41.756 -71.488 04/03/2010 Furnace Hill Brook Phenix Rd US1

G Disk

R 69.90

USGS-26 60-100 60-100-US2 GJS, GCB 41.756 -71.488 04/03/2010 Furnace Hill Brook Phenix Rd US2

G Disk

R 69.77

USGS-27 60-100 60-100-US10A GJS, GCB 41.756 -71.487 04/03/2010 Furnace Hill Brook Phenix Rd US10A

G Disk

R 59.90

USGS-28 60-100 60-100-DS10A GJS, GCB 41.756 -71.487 04/03/2010 Furnace Hill Brook Phenix Rd DS10A F Disk

R 58.57

USGS-29 GREF-Rt95 GreenFalls1 PJL,ALU 41.443 -71.796 04/06/2010 Green Falls River Rt 95 New London Tpk Brdg 48 US

G Chisel

R 57.67
20 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-30 GREF-Rt95 GreenFalls2 PJL,ALU 41.443 -71.796 04/06/2010 Green Falls River Rt 95 New London Tpk Brdg 48 DS

G Chisel

R 56.43

USGS-31 1115265 01115265 GJS, MTN 41.791 -71.699 04/05/2010 Hemlock Brook Sta 01115265 King Rd F Disk

R 406.87

USGS-32 HUNT-403 HR-4-4.1 GDF, LRR 41.624 -71.482 04/07/2010 Hunt River Davisvill Rd Brdg US

E Nail

L 43.48

USGS-33 HUNT-402 HR-5-5.1 GDF, LRR 41.628 -71.480 04/07/2010 Hunt River Hwy 402 Brdg US F Nail

L 37.05

USGS-34 HUNT-402 HR-5-5.2 GDF, LRR 41.628 -71.480 04/07/2010 Hunt River Hwy 402 Brdg US F Nail

L 36.97

USGS-35 HUNT-402 HR-5-5.3 GDF, LRR 41.629 -71.480 04/07/2010 Hunt River Hwy 402 Brdg DS

E Pen

R 36.32

USGS-36 HUNT-1 HR-6-6.1 GDF, LRR 41.635 -71.468 04/07/2010 Hunt River Hwy 1 Brdg US

G Nail

L 30.05

USGS-37 HUNT-1 HR-6-6.2 GDF, LRR 41.634 -71.468 04/07/2010 Hunt River Hwy 1 Brdg DS

G Nail

L 28.59

USGS-38 HUNT-1 HR-6-6.3 GDF, LRR 41.636 -71.468 04/07/2010 Hunt River Hwy 1 Brdg DS

E Pen

L 27.89

USGS-39 1115110 01115110 GJS, MTN 41.847 -71.612 04/05/2010 Huntinghouse Bk. Sta 01115110 Eludale Rd

G Disk

R 298.09

USGS-40 HUNT-Rt2 HR rt4 LE1 PJL,ALU 41.594 -71.499 04/07/2010 Hunts R.- Scrabbletown Bk Rt 2, Rt 4, Stony Ln. LE Brdg abut- ment

G Pen

L 60.64

USGS-41 HUNT-Rt2 HR rt2 US LE2 PJL,ALU 41.594 -71.498 04/07/2010 Hunts R.- Scrabbletown Bk Rt 2, Rt 4, Stony Ln. US F Disk

L 58.96

USGS-42 HUNT-Rt2 HR rt 2 US LE3 PJL,ALU 41.594 -71.498 04/07/2010 Hunts R.- Scrabbletown Bk Rt 2, Rt 4 , Stony Ln. US F Disk

L 59.03

USGS-43 HUNT-Rt2 HR DS LE4 PJL,ALU 41.594 -71.498 04/07/2010 Hunts R.- Scrabbletown Bk Rt 2, Rt 4 , Stony Ln. DS P Disk

L 55.54

USGS-44 HUNT-Rt2 HR DS RE 5 PJL,ALU 41.594 -71.498 04/07/2010 Hunts R.- Scrabbletown Bk Rt 2, Rt 4 , Stony Ln. DS P Stake

R 55.68

USGS-45 HUNT-Sou HR-US LE1 PJL,ALU 41.606 -71.520 04/07/2010 Hunts R.- Scrabbletown Bk South Rd., Shady Hill Dr., US F Pen

L 243.86

USGS-46 HUNT-Sou HR-DS LE2 PJL,ALU 41.606 -71.519 04/07/2010 Hunts R.- Scrabbletown Bk South Rd., Shady Hill Dr., DS F Pen

L 237.56

USGS-47 HUNT-Sou2 HR-South-US1 PJL,ALU 41.607 -71.491 04/07/2010 Hunt River Rt 2 & South Rd. US

G Disk

R 44.96

USGS-48 HUNT-Sou2 HR-South-DS2 PJL,ALU 41.607 -71.491 04/07/2010 Hunt River Rt 2 & South Rd. DS F Disk

R 44.40

USGS-49 1115170 01115170-DS GJS, MTN 41.841 -71.585 04/05/2010 Moswansicut Str. Sta 01115170 Rt 116 DS

G Disk

R 296.51

USGS-50 1115170 01115170-US GJS, MTN 41.841 -71.584 04/05/2010 Moswansicut Str. Sta 01115170 Rt 116 US F Disk

R 298.97

USGS-51 NPAW-Fai Fair-USRE1 PJL,ALU 41.721 -71.533 04/05/2010 N Br Pawtuxet 

River

Fairview Rd Brdg US P Disk

R 101.69

USGS-52 NPAW-Fai Fair-DSRE2 PJL,ALU 41.720 -71.532 04/05/2010 N Br Pawtuxet 

River

Fairview Rd Brdg DS F Disk

R 101.23
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 21

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-53 NPAW-Lic Linc-USRE1 PJL,ALU 41.724 -71.536 04/05/2010 N Br Pawtuxet 

River

Lincoln Ave Brdg US

G Disk

R 107.60

USGS-54 NPAW-Lic Linc-DSRE2 PJL,ALU 41.724 -71.536 04/05/2010 N Br Pawtuxet 

River

Lincoln Ave Brdg DS

G Chisel

R 105.96

USGS-55 NPAW-Lic Linc-DSRE3 PJL,ALU 41.724 -71.536 04/05/2010 N Br Pawtuxet 

River

Lincoln Ave Brdg DS

G Disk

R 105.83

USGS-56 NPAW-Hil Hill-USRE1 PJL,ALU 41.730 -71.547 04/05/2010 N Br Pawtuxet 

River

Hill St Br off of Rt 115 US

G Disk

R 145.78

USGS-57 NPAW-Hil Hill-DSRE2 PJL,ALU 41.730 -71.546 04/05/2010 N Br Pawtuxet 

River

Hill St Br off of Rt 115 DS

G Disk

R 145.71

USGS-58 NPAW-Gra GrantWay1 PJL,ALU 41.744 -71.576 04/05/2010 N Br Pawtuxet 

River

30 Grant Way (house) DS

G Pen u 204.51

USGS-59 NPAW-Gra GrantWay2 PJL,ALU 41.744 -71.576 04/05/2010 N Br Pawtuxet 

River

30 Grant Way (house) US

E Pen u 204.63

USGS-60 NPAW-116.2 Rt116.2-USRE1 PJL,ALU 41.730 -71.563 04/05/2010 N Br Pawtuxet 

River

Rte 116 Brdg US F Disk

R 193.31

USGS-61 NPAW-116.2 Rt116.2-DSRE2 PJL,ALU 41.730 -71.563 04/05/2010 N Br Pawtuxet 

River

Rte 116 Brdg DS P Stake

R 190.97

USGS-62 NPAW-Fur Fur-USRE1 PJL,ALU 41.731 -71.565 04/05/2010 N Br Pawtuxet 

River

Dam-Hope Furnace Rd off Rt 116 

US

G Disk

R 201.14

USGS-63 NPAW-Fur Fur-USRE2 PJL,ALU 41.731 -71.565 04/05/2010 N Br Pawtuxet 

River

Dam-Hope Furnace Rd off Rt 116 

US

G Disk

R 201.09

USGS-64 NPAW-Col Col-USRE1 PJL,ALU 41.734 -71.553 04/05/2010 N Br Pawtuxet 

River

Colvin Rd US P Disk

R 164.76

USGS-65 NPAW-Col Col-USRE2 PJL,ALU 41.734 -71.553 04/05/2010 N Br Pawtuxet 

River

Colvin Rd US F Disk

R 164.56

USGS-66 NPAW-Col COL-DSRE3 PJL,ALU 41.734 -71.553 04/05/2010 N Br Pawtuxet 

River

Colvin Rd DS P Disk

R 163.22

USGS-67 NPAW-Col Col-DSRE4 PJL,ALU 41.734 -71.553 04/05/2010 N Br Pawtuxet 

River

Colvin Rd DS P Disk

R 163.66

USGS-68 NPAW-6001 Fisk-USLE1 PJL,ALU 41.733 -71.550 04/05/2010 N Br Pawtuxet 

River

USGS sta 01115500 disc P Chisel

L 153.41

USGS-69 NPAW-6001 Fisk-USLE2 PJL,ALU 41.733 -71.550 04/05/2010 N Br Pawtuxet 

River

USGS sta 01115500 disc P Disk

L 153.23
22 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-70 NPAW-116 Rt116-USRE1 PJL,ALU, GLS 41.716 -71.524 04/05/2010 N Br Pawtuxet River Rt 116 Brdg US1 F Disk

R 67.50

USGS-71 NPAW-116 Rt116-USRE2 PJL,ALU, GLS 41.716 -71.524 04/05/2010 N Br Pawtuxet 

River

Rt 116 Brdg US2

G Disk

R 67.51

USGS-72 NPAW-116 Rt116-DSRE3 PJL,ALU, GLS 41.716 -71.523 04/05/2010 N Br Pawtuxet 

River

Rt 116 Brdg DS1

G Pen

L 65.68

USGS-73 11117340 011117340-1US COS, GCB 41.450 -71.616 04/06/2010 Pawcatuck River Biscuit City Rd. US

G tape

R 193.11

USGS-74 11117340 011117340-2US COS, GCB 41.450 -71.616 04/06/2010 Pawcatuck River Biscuit City Rd. US

G tape

R 193.38

USGS-75 11117340 011117340-3DS COS, GCB 41.450 -71.616 04/06/2010 Pawcatuck River Biscuit City Rd. DS

G tape

R 92.78

USGS-76 PAW-Sher PAW-SHER-1US COS, GCB 41.444 -71.627 04/06/2010 Pawcatuck River Sherman Ave. US

G Pen

L 89.92

USGS-77 PAW-Sher PAW-SHER-2US COS, GCB 41.444 -71.627 04/06/2010 Pawcatuck River Sherman Ave. US

G Nail

L 89.92

USGS-78 PAW-Sher PAW-SHER-3DS COS, GCB 41.444 -71.628 04/06/2010 Pawcatuck River Sherman Ave. DS

G Pen

L 89.87

USGS-79 PAW-Sher PAW-SHER-4US COS, GCB 41.446 -71.626 04/06/2010 Pawcatuck River Sherman Ave. US

G Stake

R 90.09

USGS-80 PAW-Rt2 PAW-Rt2-1US COS, GCB 41.446 -71.621 04/06/2010 Pawcatuck River Rt. 2 (01117430) US F Nail

L 92.27

USGS-81 PAW-Rt2 PAW-Rt2-2US COS, GCB 41.446 -71.621 04/06/2010 Pawcatuck River Rt. 2 (01117430) US F Nail

L 92.29

USGS-82 PAW-Shann PAW-Shann-US COS, GCB 41.447 -71.636 04/06/2010 Pawcatuck River Shannock Village Rd. US F Pen

L 83.95

USGS-83 PAW-Shann PAW-Shann-DS COS, GCB 41.447 -71.637 04/06/2010 Pawcatuck River Shannock Village Rd. DS F Nail

L 75.41

USGS-89 PAW-KFR Kings-DSREW1 PJL,ALU 41.433 -71.694 04/06/2010 Pawcatuck River Kings Factory Rd Brdg 542 DS P Disk

R 50.65

USGS-90 PAW-KFR Kings-USREW2 PJL,ALU 41.433 -71.694 04/06/2010 Pawcatuck River Kings Factory Rd Brdg 542 US

U Disk

R 52.62

USGS-91 PAW-Bur Brud-DSLEW1 PJL,ALU 41.416 -71.728 04/06/2010 Pawcatuck River Brudickville Rd Bdg 375 disc 

01118010 DS

G Disk

L 47.11

USGS-92 PAW-Bur Burd-USREW2 PJL,ALU 41.416 -71.729 04/06/2010 Pawcatuck River Brudickville Rd Bdg 375 disc 

01118010 US

G Pen

R 48.40

USGS-93 PAW-Bis Biscuit-USRE1.1 PJL,ALU 41.450 -71.616 04/06/2010 Pawcatuck River Biscuit City Rd Brdg (on house 

USLB)

G Pencil

L Destroyed

USGS-94 PAW-Rt91 DS Bridge REW PJL,ALU 41.445 -71.681 04/06/2010 Pawcatuck River Rt 91 DS Brdg nr USGS gage 

(Carolina)

G Disk

R 54.06

USGS-94a Paw-WRJ 1117500 – 41.445 -71.681 – Pawcatuck River gage hse 01117500 Wood R Junc

U u u 54.02

USGS-95 500900 500900-DS1 RFB, AMW 41.377 -71.832 04/06/2010 Pawcatuck River Rt. 1 DS P Disk

R 6.59

USGS-96 500900 500900-US1 RFB, AMW 41.379 -71.831 04/06/2010 Pawcatuck River Rt. 1 US F Stake

R 9.03

USGS-97 500901 500901-US1 RFB, AMW 41.386 -71.834 04/06/2010 Pawcatuck River NAPA Auto Parts US F Pen

R 14.76

USGS-98 500901 500901-DS1 RFB, AMW 41.384 -71.833 04/06/2010 Pawcatuck River NAPA Auto Parts DS

G Pen

L 13.98

USGS-99 500902 500902-DS1 RFB, AMW 41.394 -71.840 04/06/2010 Pawcatuck River Rt. 78 DS

G Disk

L 16.58
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 23

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-100 500902 500902-US1 RFB, AMW 41.394 -71.841 04/06/2010 Pawcatuck River Rt. 78 US

G Disk

L 15.33

USGS-101 500904 500904-DS1 RFB, AMW 41.398 -71.843 04/06/2010 Pawcatuck River Bridge St. DS

G Disk

R 18.36

USGS-102 500904 500904-US1 RFB, AMW 41.397 -71.841 04/06/2010 Pawcatuck River Bridge St. US

E Disk

L 18.61

USGS-103 500905 500905-DS1 RFB, AMW 41.418 -71.823 04/06/2010 Pawcatuck River Boombridge Rd. US

G Disk

R 29.54

USGS-104 500905 500905-US1 RFB, AMW 41.417 -71.823 04/06/2010 Pawcatuck River Boombridge Rd. DS

G Disk

L 29.73

USGS-105 500906 500906-US1 RFB, AMW 41.414 -71.798 04/06/2010 Pawcatuck River Potter Hill Rd. US

E Disk

L 33.33

USGS-106 500906 500906-DS1 RFB, AMW 41.414 -71.797 04/06/2010 Pawcatuck River Potter Hill Rd. DS P Pen

R 32.36

USGS-107 500907 500907-DS1 RFB, AMW 41.400 -71.799 04/06/2010 Pawcatuck River Rt. 3 DS F Disk

R 34.15

USGS-108 500907 500907-US1 RFB, AMW 41.399 -71.799 04/06/2010 Pawcatuck River Rt. 3 US

G Pen

R 36.73

USGS-109 PAW-Rt216 Paw US RE 1 PJL,ALU 41.408 -71.748 04/07/2010 Pawcatuck River Rt 91&216 Brdg 194 US

G Disk

R 41.60

USGS-110 PAW-Rt216 Paw DS RE 2 PJL,ALU 41.408 -71.748 04/07/2010 Pawcatuck River Rt 91&216 Brdg 194 DS F Pen

R 40.96

USGS-111 PAW-OSR Paw US DAM RE 1 PJL,ALU 41.447 -71.643 04/07/2010 Pawcatuck River Old Shannok Rd Brdg 58 dam F Disk

R 171.54

USGS-112 PAW-OSR Paw US LE 2 PJL,ALU 41.448 -71.645 04/07/2010 Pawcatuck River Old Shannok Rd Brdg 58 US F Disk

L 65.75

USGS-113 PAW-OSR Paw DS LE 3 PJL,ALU 41.448 -71.645 04/07/2010 Pawcatuck River Old Shannok Rd Brdg 58 DS F Disk

L 64.94

USGS-114 PAW-Rt112 Paw-Rt112-US1 PJL,ALU 41.459 -71.663 04/07/2010 Pawcatuck River Rt 112 & Butter Ln. US

G Disk

R 60.25

USGS-115 PAW-Rt112 Paw-Rt112-US2 PJL,ALU 41.458 -71.663 04/07/2010 Pawcatuck River Rt 112 & Butter Ln. US F Disk

L 60.20

USGS-116 PAW-Rt112 Paw DS of Mill PJL,ALU 41.460 -71.665 04/07/2010 Pawcatuck River Rt 112 & Butter Ln. DS F Nail u 55.42USGS-117 40-301 40-301-DS1 GJS, GCB 41.723 -71.489 04/03/2010 Pawtuxet River East Ave. DS

G Disk

L 41.20

USGS-118 40-301 40-301-US1 GJS, GCB 41.723 -71.490 04/03/2010 Pawtuxet River East Ave. US

G Disk

L 41.79

USGS-119 500300 500300-DS1 RFB, AMW, ALU 41.751 -71.444 04/03/2010 Pawtuxet River USGS sta 01116500

G Disk

L 27.73

USGS-119a 1116500 1116500 PJL, MTN 41.751 -71.444 04/12/2010 Pawtuxet River at USGS sta 01116500

U u u 128.09

USGS-120 500301 500301-DS1 RFB, AMW, ALU 41.750 -71.447 04/03/2010 Pawtuxet River Worthington Road

G Chisel

L 28.42

USGS-121 500302 500302-US1 RFB, AMW, ALU 41.749 -71.447 04/03/2010 Pawtuxet River Rt. 37 between brdgs

G Disk

L 28.76

USGS-122 500303 500303-US1 RFB, AMW, ALU 41.749 -71.447 04/03/2010 Pawtuxet River Rt. 37 US

G Disk

L 28.94

USGS-123 500304 500304-DS1 RFB, AMW, ALU 41.726 -71.471 04/03/2010 Pawtuxet River Rt. 5 DS

G Disk

R 34.24

USGS-124 500305 500305-US1 RFB, AMW, ALU 41.725 -71.472 04/03/2010 Pawtuxet River Rt. 5 US F Disk

R 33.65

USGS-125 500306 500306-US1 RFB, AMW, ALU 41.720 -71.478 04/03/2010 Pawtuxet River 295 S US

G Disk

L 38.41

USGS-126 500306 500306-DS1 RFB, AMW, ALU 41.720 -71.478 04/03/2010 Pawtuxet River 295 S, between N&S lanes

G Disk

L 37.81

USGS-127 500307 500307-DS1 RFB, AMW, ALU 41.720 -71.477 04/03/2010 Pawtuxet River 295 N DS

G Disk

L 37.47

USGS-128 500308 500308-DS1 RFB, AMW, ALU 41.723 -71.481 04/03/2010 Pawtuxet River Rt. 2, most DS

G Disk

R 39.11

USGS-129 500308 500308-US1 RFB, AMW, ALU 41.723 -71.482 04/03/2010 Pawtuxet River Rt. 2, between N&S lanes

G Disk

R 39.15
24 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-130 500309 500309-US1 RFB, AMW, ALU 41.722 -71.482 04/03/2010 Pawtuxet River Rt. 2, most US F Disk

R 39.60

USGS-131 500310 500310-US1 RFB, AMW, ALU 41.723 -71.481 04/03/2010 Pawtuxet River Rt. 2, most US

G Stake

R 139.57

USGS-132 500311 500311-US1 RFB, AMW, ALU 41.723 -71.481 04/03/2010 Pawtuxet River Rt. 2, between N&S lanes F Disk

R 38.90

USGS-133 500311 500311-DS1 RFB, AMW, ALU 41.723 -71.481 04/03/2010 Pawtuxet River Rt. 2, most DS

E Disk

L 39.05

USGS-134 500312 500312-DS1 RFB, AMW, ALU 41.723 -71.484 04/03/2010 Pawtuxet River On Ramp Rt 2 to 295 DS

G Disk

R 39.67

USGS-135 500312 500312-US1 RFB, AMW, ALU 41.723 -71.484 04/03/2010 Pawtuxet River On Ramp Rt 2 to 295 US

U Disk

R 40.40

USGS-136 500314 500314-WM1 RFB, AMW 41.726 -71.476 04/05/2010 Pawtuxet River Warwick Mall-Subway Door

E Pen u 36.87

USGS-137 500314 500314-WM2 RFB, AMW 41.724 -71.475 04/05/2010 Pawtuxet River Warwick Mall-Sports Auth

E Pen u 36.55

USGS-138 500314 500314-WM3 RFB, AMW 41.722 -71.473 04/05/2010 Pawtuxet River Warwick Mall-Showcase Cin

E Pen u 36.62

USGS-139 500314 500314-WM4 RFB, AMW 41.722 -71.476 04/05/2010 Pawtuxet River Warwick Mall-Target

E Pen u 36.67

USGS-140 500314 500314-WM5 RFB, AMW 41.722 -71.478 04/05/2010 Pawtuxet River Warwick Mall-Firestone

E Pen u 36.71

USGS-141 500314 500314-WM6 RFB, AMW 41.724 -71.478 04/05/2010 Pawtuxet River Warwick Mall-opp. Longhorn Rest

E Pen u 37.63

USGS-142 500315 500315-DS1 RFB, AMW 41.717 -71.493 04/05/2010 Pawtuxet River Rt. 33 DS

G Nail

R 54.37

USGS-143 500315 500315-US1 RFB, AMW 41.717 -71.493 04/05/2010 Pawtuxet River Rt. 33 US

G Nail

R 55.45

USGS-144 500316 500316-WWTP1 RFB, AMW 41.751 -71.443 04/05/2010 Pawtuxet River Cranston WWTP (same as 500200)

G Pen

L 27.45

USGS-145 500316 500316-WWTP2 RFB, AMW 41.752 -71.443 04/05/2010 Pawtuxet River Cranston WWTP

E Pen

L 27.58

USGS-146 500316 500316-WWTP3 RFB, AMW 41.752 -71.443 04/05/2010 Pawtuxet River Cranston WWTP

E Pen

L 27.51

USGS-147 500317 500317-WWTP1 RFB, AMW 41.737 -71.450 04/05/2010 Pawtuxet River Warwick WWTP, Admin bldg

E Pen u 31.61

USGS-148 500317 500317-WWTP2 RFB, AMW 41.736 -71.450 04/05/2010 Pawtuxet River Warwick WWTP, Operation bldg

E Pen u 31.62

USGS-149 500317 500317-WWTP3 RFB, AMW 41.736 -71.451 04/05/2010 Pawtuxet River Warwick WWTP, inlet bldg

G Pen u 31.72

USGS-150 500317 500317-WWTP4 RFB, AMW 41.736 -71.451 04/05/2010 Pawtuxet River Warwick WWTP, digester

E Pen u 31.66

USGS-151 500317 500317-WWTP5 RFB, AMW 41.736 -71.452 04/05/2010 Pawtuxet River Warwick WWTP, solids bldg

E Pen u 31.56

USGS-152 500318 500318-WWTP1 RFB, AMW 41.727 -71.488 04/05/2010 Pawtuxet River WWTP

U Pen

L 41.07

USGS-153 500318 500318-WWTP2 RFB, AMW 41.727 -71.488 04/05/2010 Pawtuxet River WWTP

E Pen

L Destroyed

USGS-154 500318 500318-WWTP3 RFB, AMW 41.727 -71.487 04/05/2010 Pawtuxet River WWTP

E Pen

L Destroyed

USGS-155 500318 500318-WWTP4 RFB, AMW 41.727 -71.486 04/05/2010 Pawtuxet River WWTP

U Pen

L 41.03

USGS-156 1115098 01115098 GJS, MTN 41.852 -71.606 04/05/2010 Peeptoad Brook Sta 01115098 Emdale Rd F Disk

R 318.12

USGS-158 500201 500201 US1 ALU,GJS,GCB 41.760 -71.443 04/02/2010 Pocasset River Pontiac Dr. US

G Disk

L 26.06

USGS-159 500201 500201 DS1 ALU,GJS,GCB 41.760 -71.443 04/02/2010 Pocasset River Pontiac Dr. DS

G Disk

L 25.61

USGS-160 500202 500202 DS1 ALU,GJS,GCB 41.761 -71.444 04/02/2010 Pocasset River Garden City Dr. DS F Stake

L 26.28

USGS-161 500202 500202 US1 ALU,GJS,GCB 41.761 -71.443 04/02/2010 Pocasset River Garden City Dr. US

G Disk

L 27.19
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 25

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-162 500203 500203 DS1 ALU,GJS,GCB 41.770 -71.453 04/02/2010 Pocasset River Rt. 2 DS1

G Disk

R 27.87

USGS-163 500203 500203 DS2 ALU,GJS,GCB 41.771 -71.453 04/02/2010 Pocasset River Rt. 2 DS2 F Disk

L 27.86

USGS-164 500203 500203 US1 ALU,GJS,GCB 41.771 -71.454 04/02/2010 Pocasset River Rt. 2 US1 F Disk

L 28.18

USGS-165 500203 500203 US2 ALU,GJS,GCB 41.771 -71.454 04/02/2010 Pocasset River Rt. 2 US2 P Disk

R 28.09

USGS-166 500203 500203 US3 ALU,GJS,GCB 41.771 -71.454 04/02/2010 Pocasset River Rt. 2 US3 P Stake

R 28.65

USGS-167 500204 500204 US1 ALU,GJS,GCB 41.785 -71.457 04/02/2010 Pocasset River Old Park Ave. US F Disk

R 42.85

USGS-168 500204 500204 DS1 ALU,GJS,GCB 41.785 -71.456 04/02/2010 Pocasset River Old Park Ave. DS P Disk

L 141.34

USGS-169 500205 500205 US1 ALU,GJS,GCB 41.784 -71.456 04/02/2010 Pocasset River Rt. 12 US F Disk

L 41.92

USGS-170 500205 500205 DS1 ALU,GJS,GCB 41.784 -71.456 04/02/2010 Pocasset River Rt. 12 DS F Disk

L 39.68

USGS-171 500206 500206 DS1 ALU,GJS,GCB 41.790 -71.459 04/02/2010 Pocasset River Cranston Ave. DS F Disk

R 47.46

USGS-172 500206 500206 US1 ALU,GJS,GCB 41.790 -71.459 04/02/2010 Pocasset River Cranston Ave., nr printworks US

G Chisel

R 49.72

USGS-173 500206 500206 US2 ALU,GJS,GCB 41.794 -71.459 04/02/2010 Pocasset River Cranston Ave. US

G Chisel

L 67.46

USGS-174 500207 500207 ALU,GJS,GCB 41.751 -71.444 04/02/2010 Pocasset River at WWTP

G Pen

L 79.80

USGS-175 500208 500208 ALU,GJS,GCB 41.805 -71.488 04/02/2010 Pocasset River Morgan Ave. F Disk

L 94.62

USGS-176 500209 500209 US1 ALU,GJS,GCB 41.810 -71.491 04/02/2010 Pocasset River Central Ave. US

G Disk

L 100.12

USGS-177 500209 500209 DS1 ALU,GJS,GCB 41.810 -71.491 04/02/2010 Pocasset River Central Ave. DS F Disk

R 98.30

USGS-178 50-270 50-270-US1 GJS, GCB 41.828 -71.508 04/03/2010 Pocasset River Memorial Ave. US

G Chisel

L 155.10

USGS-179 50-270 50-270-DS1 GJS, GCB 41.828 -71.508 04/03/2010 Pocasset River Memorial Ave. DS

G Disk

R 152.18

USGS-180 50-260 50-260-US1 GJS, GCB 41.826 -71.506 04/03/2010 Pocasset River Rt. 6A

G Disk

L 149.54

USGS-181 50-250 50-250-DS1 GJS, GCB 41.819 -71.497 04/03/2010 Pocasset River Rt. 5 DS F Disk

R 124.50

USGS-182 50-250 50-250-US1 GJS, GCB 41.819 -71.498 04/03/2010 Pocasset River Rt. 5 F Disk

R 125.14

USGS-182a POCA-Pla – – 41.797 -71.480 04/22/2010 Pocasset River Plainfield Pike USLE

U u L 179.88

USGS-182b POCA-AtUS – – 41.796 -71.484 04/22/2010 Pocasset River Atwood Ave USLE

U u L 189.13

USGS-182c POCA-AtDS – – 41.797 -71.483 04/22/2010 Pocasset River Atwood Ave DSRE

U u R 186.79

USGS-182d POCA-AtNUS – – 41.819 -71.498 04/22/2010 Pocasset River Atwood Ave North USRE

U u R 1125.26

USGS-182e POCA-AtNDS – – 41.819 -71.497 04/22/2010 Pocasset River Atwood Ave North DSDE

U u R 1124.57

USGS-182f POCA-RSt – – 41.723 -71.490 04/22/2010 Pocasset River #21 River St near East Ave

U u u 141.55

USGS-183 POCA-Fle Eastland PJL,ALU,GLS 41.796 -71.476 04/05/2010 Pocasset River 69 Fletcher Ave

G Pen u 76.14

USGS-184 1115187 01115187 GJS, MTN 41.819 -71.705 04/05/2010 Poganset River Sta 01115187 Rans Trail

G Disk

L 354.88

USGS-185 QUEN-KGM QU-USGC1 GJS, MTN 41.504 -71.608 04/06/2010 Queen River Glen Rock Rd. at mill pond

G Disk

R 113.80

USGS-186 QUEN-Dug QU-DSDB1 GJS, MTN 41.517 -71.601 04/06/2010 Queen River Dugway Rd Brdg DS

G Disk

R 119.98
26 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-187 QUEN-Dug QU-USDB2 GJS, MTN 41.517 -71.599 04/06/2010 Queen River DugwayRd Brdg US

G Disk

L 116.69

USGS-188 QUEN-Mai QU-Mail GJS, MTN 41.539 -71.569 04/06/2010 Queen River Mail Rd 01117370

G Chisel

L 125.62

USGS-189 QUEN-WAR QU-Allen-US1 GJS, MTN 41.549 -71.561 04/06/2010 Queen River West Allenton Rd Brdg US

G Disk

R 135.20

USGS-190 QUEN-WAR QU-Allen-DS1 GJS, MTN 41.548 -71.561 04/06/2010 Queen River West Allenton Rd Brdg DS

G Disk

R 134.71

USGS-191 QUEN-WRR QU-WR-US1 GJS, MTN 41.563 -71.548 04/06/2010 Queen River William Reynolds Rd Brdg US

G Disk

L 147.84

USGS-192 QUEN-WRR QU-WR-DS1 GJS, MTN 41.562 -71.548 04/06/2010 Queen River William Reynolds Rd Brdg DS F Disk

L 145.89

USGS-193 QUEN-3545 011173545-1 GJS, MTN 41.566 -71.548 04/06/2010 Queen River disc 011173545 William Reynolds 

Rd. 

F Disk

L 156.43

USGS-194 QUEN-3545 011173545-2 GJS, MTN 41.566 -71.548 04/06/2010 Queen River disc 011173545 William Reynolds 

Rd. 

P Disk

L 156.50

USGS-195 QUEN-3545 011173545-3 GJS, MTN 41.566 -71.548 04/06/2010 Queen River disc 011173545 William Reynolds 

Rd. 

P Disk

L 156.54

USGS-196 QUEN-Rt102 Rt102-SG GJS, MTN 41.578 -71.543 04/06/2010 Queen River Rt 102 (10 Rod Rd.) staff gage F Disk

L 188.53

USGS-197 1115183 01115183 GJS, MTN 41.798 -71.585 04/05/2010 Quonopaug Brook Sta 01115183 Rt 116 F Disk

L 315.74

USGS-198 1115114 01115114 GJS, MTN 41.837 -71.612 04/05/2010 Rush Brook. Sta 1115114 Eludale Rd

G Disk

R 297.21

USGS-199 500500 500500 RFB, GJS 41.619 -71.456 04/07/2010 Sandhill Brook Chadsey Rd.

G Disk

R 26.40

USGS-200 500501 500501-US1 RFB, GJS 41.622 -71.446 04/07/2010 Sandhill Brook Potter Rd. US

G Disk

L 22.45

USGS-201 500501 500501-DS1 RFB, GJS 41.622 -71.446 04/07/2010 Sandhill Brook Potter Rd. DS

G Disk

L 20.38

USGS-202 50-402 50-402 GJS, GCB 41.791 -71.509 04/03/2010 Simmons Brook Ranp of I295 to Rt. 114 West

G Disk

R 285.08

USGS-203 50-401 50-401-US1 GJS, GCB 41.796 -71.484 04/03/2010 Simmons Brook Rt. 5 US

G Disk

L 88.83

USGS-204 50-401 50-401-DS2 GJS, GCB 41.797 -71.483 04/03/2010 Simmons Brook Rt. 5 DS

G Disk

R 86.64

USGS-205 1115184 01115184 GJS, MTN 41.789 -71.621 04/05/2010 Spruce Brook Sta 01115184 Rt 14 Wilbur Hollow 

Rd.

U Disk

R 296.77

USGS-206 TOMA-Col Tom1.1 USREW PJL,ALU 41.443 -71.764 04/06/2010 Tomaquag River Collins Rd Brdg US

G Chisel

R 89.55

USGS-207 TOMA-Col Tom1.2 DSLEW PJL,ALU 41.443 -71.764 04/06/2010 Tomaquag River Collins Rd Brdg DS P Disk

L 85.65

USGS-208 TOMA-Dia Tom2.1 DSREW PJL,ALU 41.418 -71.764 04/06/2010 Tomaquag River Diamond Hill Rd culvert DS F Disk

R 43.85

USGS-209 TOMA-Dia Tom2.2 USREW PJL,ALU 41.419 -71.763 04/06/2010 Tomaquag River Diamond Hill Rd culvert US F Disk

R 46.57

USGS-210 TOMA-Dia Tom2.3 USLEW PJL,ALU 41.419 -71.763 04/06/2010 Tomaquag River Diamond Hill Rd culvert US F Disk

L 46.73

USGS-211 TOMA-Rt216 Tom3.1 PJL,ALU 41.411 -71.764 04/06/2010 Tomaquag River Rt 216-Chase Hill Rd DS

U Disk

R 39.16

USGS-212 TOMA-Rt216 Tom3.2 PJL,ALU 41.411 -71.764 04/06/2010 Tomaquag River Rt 216-Chase Hill Rd US F Disk

L 39.21

USGS-213 USQU-Rt2-US 01117420-1 GJS, MTN 41.477 -71.605 04/06/2010 Usquepaug River Sta 01117420 US

G Chisel

L 101.97

USGS-214 USQU-Rt2-DS 01117420-2 GJS, MTN 41.477 -71.605 04/06/2010 Usquepaug River Sta 01117420 DS

G Chisel

R 101.08
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 27

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-215 USQU-Rt138 US138-1-US GJS, MTN 41.503 -71.608 04/06/2010 Usquepaug River dsc. 01117410 Rt 138 US

G Disk

L 108.63

USGS-216 USQU-Rt138 DS138-2-DS GJS, MTN 41.502 -71.608 04/06/2010 Usquepaug River dsc. 01117410 Rt 138 DS

U Disk

L 107.88

USGS-217 USQU-Our USQ-1-US GJS, MTN 41.503 -71.608 04/06/2010 Usquepaug River Old Usquepaug Rd US F Disk

L 111.82

USGS-218 USQU-Our USQ-2-DS GJS, MTN 41.503 -71.608 04/06/2010 Usquepaug River Old Usquepaug Rd DS

G Disk

L 107.55

USGS-219 1115276 01115276-1-DS GJS, MTN 41.786 -71.667 04/05/2010 Westconnaug Str. Sta 01115276 Rt 12 F Disk

L 339.88

USGS-220 1115276 01115276-2-US GJS, MTN 41.786 -71.667 04/05/2010 Westconnaug Str. Sta 01115276 Rt 12 DSRB F Chisel

R 341.14

USGS-221 1115297 01115297-1 GJS, MTN 41.765 -71.636 04/05/2010 Wilbur Hollow Bk. Sta 01115297 at dam

G Disk

L 337.18

USGS-222 1115297 01115297-2 GJS, MTN 41.765 -71.636 04/05/2010 Wilbur Hollow Bk. Sta 01115297 US Old Plain Field 

Pike Brdg

F Stake

L 333.30

USGS-223 1115297 01115297-3 GJS, MTN 41.765 -71.636 04/05/2010 Wilbur Hollow Bk. Sta 01115297 DS Old Plain Field 

Pike Brdg

F Disk

L 329.96

USGS-224 1115297 01115297-4 GJS, MTN 41.765 -71.636 04/05/2010 Wilbur Hollow Bk. Sta 01115297 OG

G OG

L 326.28

USGS-225 WOON-Sti WR-1-1.1 GDF, LRR 41.889 -71.508 04/05/2010 Woonasquatucket 

R.

Stillwater Rd. boat ramp

G Nail

R 155.20

USGS-226 WOON-Whi WR-2-2.1 GDF, LRR 41.887 -71.506 04/05/2010 Woonasquatucket 

R.

Whipple Ave. Brdg US

E Pen

R 128.85

USGS-227 WOON-Whi WR-2-2.2 GDF, LRR 41.887 -71.505 04/05/2010 Woonasquatucket 

R.

Whipple Ave. Brdg DS F Hub

L 127.90

USGS-228 WOON-Wat WR-3-3.1 GDF, LRR 41.881 -71.503 04/05/2010 Woonasquatucket 

R.

Waterman Ave Brdg US F Nail

R 123.59

USGS-229 WOON-Esm WR-4-4.1 GDF, LRR 41.878 -71.501 04/05/2010 Woonasquatucket 

R.

Esmond St. Brdg DS

G Hub

L Destroyed

USGS-230 WOON-Esm WR-4-4.2 GDF, LRR 41.879 -71.502 04/05/2010 Woonasquatucket 

R.

Esmond St. Brdg US F Hub

R 121.74

USGS-231 WOON-Esm WR-4-4.3 GDF, LRR 41.879 -71.502 04/05/2010 Woonasquatucket 

R.

Esmond St. Brdg US

U Pen

R 121.76

USGS-232 WOON-Esm2 WR-5-5.1 GDF, LRR 41.874 -71.497 04/05/2010 Woonasquatucket 

R.

Esmond St. Brdg US

E Nail

L 117.12

USGS-233 WOON-Gre WR-6-6.1 GDF, LRR 41.865 -71.493 04/05/2010 Woonasquatucket 

R.

Greystone Ave Brdg US

E Pen

R 111.68

USGS-234 WOON-Gre WR-6-6.2 GDF, LRR 41.865 -71.492 04/05/2010 Woonasquatucket 

R.

Greystone Ave Brdg DS

G Hub

L 110.34

USGS-235 1114500 01114500-WR30 LTB, DM 41.860 -71.487 04/05/2010 Woonasquatucket 

R.

Rt. 44 US

G Nail

L 104.61
28 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-236 1114500 01114500-WR31 LTB, DM 41.860 -71.487 04/05/2010 Woonasquatucket R. Rt. 44 US

G flag

L 104.60

USGS-237 WOON-Grn1 WPT 049-WR32US LTB, DM 41.833 -71.471 04/05/2010 Woonasquatucket 

R.

Greenville US F None

L 65.12

USGS-238 WOON-Grn1 WPT 049-WR33US LTB, DM 41.833 -71.471 04/05/2010 Woonasquatucket 

R.

Greenville US F None

L 65.12

USGS-239 WOON-Grn2 WPT 050-WR34DS LTB, DM 41.833 -71.470 04/05/2010 Woonasquatucket 

R.

Greenville DS P Nail

R Destroyed

USGS-240 WOON-Grn2 WPT 051-WR35DS LTB, DM 41.833 -71.470 04/05/2010 Woonasquatucket 

R.

Greenville DS P Nail

R 61.77

USGS-241 WOON-Rt6-1 WPT 052-WR36 LTB, DM 41.824 -71.461 04/05/2010 Woonasquatucket 

R.

Glen Bridge US

U Nail

L 49.65

USGS-242 WOON-Rt6-1 WPT 054-WR37 LTB, DM 41.823 -71.460 04/05/2010 Woonasquatucket 

R.

Glen Bridge DS P Nail

L 48.37

USGS-243 WOON-Rt6-1 WPT 055-WR38 LTB, DM 41.823 -71.459 04/05/2010 Woonasquatucket 

R.

Glen Bridge US P Nail

L 47.17

USGS-244 WOON-Rt6-1 WPT 056-WR39 LTB, DM 41.822 -71.459 04/05/2010 Woonasquatucket 

R.

Glen Bridge DS F None

R 46.34

USGS-245 WOON-Rt6-2 WPT 057-40 LTB, DM 41.821 -71.454 04/06/2010 Woonasquatucket 

R.

Rt. 6 US

G Nail

R 43.19

USGS-246 WOON-Rt6-2 WPT 057-41 LTB, DM 41.821 -71.454 04/06/2010 Woonasquatucket 

R.

Rt. 6 US

G Nail

R 43.17

USGS-247 WOON-Rt6-3 WPT 058-42 LTB, DM 41.822 -71.453 04/06/2010 Woonasquatucket 

R.

Rt. 6 DS F Nail

L Destroyed

USGS-248 WOON-Ped WPT059-WR43 LTB, DM 41.822 -71.453 04/06/2010 Woonasquatucket 

R.

Perdestrian Brdg at Marino Park P Nail

L 38.65

USGS-249 WOON-San WPT 060-WR43 LTB, DM 41.817 -71.442 04/06/2010 Woonasquatucket 

R.

San Souci Dr stores P Nail

R 25.37

USGS-250 WOON-Man WPT 061-WR44 LTB, DM 41.817 -71.444 04/06/2010 Woonasquatucket 

R.

Manton Ave P Nail

L 30.25

USGS-251 WOON-Val WPT 062-WR45 LTB, DM 41.819 -71.441 04/06/2010 Woonasquatucket 

R.

Delanie St & Valley St P u R 24.01

USGS-252 WOON-Del WPT 063-WR46 LTB, DM 41.819 -71.442 04/06/2010 Woonasquatucket 

R.

Delanie St & Valley St

U flag

R 23.95
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 29

Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued[GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown]

GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet)

USGS-253 WOON-Del WPT 063-WR47 LTB, DM 41.821 -71.442 04/06/2010 Woonasquatucket 

R.

Delanie St & Valley St F Pen

R 20.75

USGS-254 WOON-RSM WPT 064-WR48 LTB, DM 41.822 -71.442 04/06/2010 Woonasquatucket 

R.

parking lot off Valley St nr low dam F Nail

R 19.73

USGS-255 WOON-RSM WPT 064-WR49 LTB, DM 41.822 -71.442 04/06/2010 Woonasquatucket 

R.

parking lot off Valley St nr low dam P Nail

R 20.68

USGS-256 WOON-Val2 WPT 065-WR50 LTB, DM 41.823 -71.441 04/06/2010 Woonasquatucket 

R.

195 Valley St US P Pen

L 18.61

USGS-257 WOON-Val2 WPT 065-WR51 LTB, DM 41.822 -71.440 04/06/2010 Woonasquatucket 

R.

195 Valley St DS

G u R 17.55

USGS-258 WOON-Atw WPT068-WR52 LTB, DM 41.824 -71.438 04/07/2010 Woonasquatucket 

R.

Atwells Ave US

G Pen

L 14.02

USGS-259 WOON-Atw WPT068-WR53 LTB, DM 41.825 -71.438 04/07/2010 Woonasquatucket 

R.

Atwells Ave DS P u R 12.39

USGS-260 WOON-PR WPT070-WR54 LTB, DM 41.826 -71.437 04/07/2010 Woonasquatucket 

R.

service Rd off Atwells Ave Price 

Rite US

G Pen

L 11.78

USGS-261 WOON-PR WPT070-WR55 LTB, DM 41.826 -71.437 04/07/2010 Woonasquatucket 

R.

service Rd off Atwells Ave Price 

Rite DS

G Pen

L 10.86

USGS-262 WOON-Eag WPT072-WR56 LTB, DM 41.826 -71.436 04/07/2010 Woonasquatucket 

R.

Eagle St Brdg US

G Pen

R 10.45

USGS-263 WOON-Eag WPT072-WR57 LTB, DM 41.827 -71.435 04/07/2010 Woonasquatucket 

R.

Eagle St Brdg DS F Pen

R 9.45

USGS-264 WOON-Aco WPT074-WR58 LTB, DM 41.829 -71.429 04/07/2010 Woonasquatucket 

R.

Acorn St Brdg US F Nail

R 7.01

USGS-265 WOON-Aco WPT075-WR59 LTB, DM 41.829 -71.428 04/07/2010 Woonasquatucket 

R.

Acorn St Brdg DS

G Nail

R 6.59

USGS-266 WOON-Ple WPT076-WR60 LTB, DM 41.829 -71.427 04/07/2010 Woonasquatucket 

R.

Pleasant Valley Pkwy-Dean St Brdg 

US

P Nail

R 6.61

USGS-267 WOON-Ple WPT077-WR61 LTB, DM 41.829 -71.427 04/07/2010 Woonasquatucket 

R.

Pleasant Valley Pkwy-Dean St Brdg 

DS

F Nail

L 6.45

USGS-268 WOON-I95 Rt95-1 COS,AMW 41.828 -71.419 04/07/2010 Woonasquatucket 

R.

Rt95 nr Kinsley St USRB F Disk

R 5.30

USGS-269 WOON-I95 Rt95-2 COS,AMW 41.828 -71.418 04/07/2010 Woonasquatucket 

R.

Rt95 nr Kinsley St USRB

E Pen

R 5.38
30 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island Table 1-1. High-water marks (HWMs) identified by the U.S. Geological Survey following the March–April 2010 flood in Rhode Island.—Continued [GPS_ID, unique identification number used for global position survey (GPS), Site_ID, unique identification of a location, HWM_ID, unique identification of HWM at a location, Lat_DD, Latitude in decimal degrees (North American Datum of 1983 (NAD 83)), Long_DD, Longitude in decimal degrees (NAD 83); Rated– E, excellent; G, good; F, fair; P, poor; U, undetermined; Mark– type of mark; u, unspecified; Bank– R, right; L, left; u, undetermined; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; –, not determined or unknown] GPS_ID Site_ID HWM_ID Party Lat_DD Long_DD Date River Location Rated Mark Bank Elevation (feet) USGS-270 WOON-Ple2 Pleas-DS1 COS,AMW 41.829 -71.423 04/07/2010 Woonasquatucket R. Pleasant Val Pkwy Brdg & Kinsley St DS

G Disk

R 6.00

USGS-271 WOON-Ple2 Pleas-US2 COS,AMW 41.829 -71.424 04/07/2010 Woonasquatucket 

R.

Pleasant Val Pkwy Brdg & Kinsley 

St US

F Disk

R 5.93

USGS-272 WOON-Ped2 Pred-USRB COS,AMW 41.829 -71.424 04/07/2010 Woonasquatucket 

R.

Predestrian Brdg & Kinsley St 

USRB

F Disk

R 5.41

USGS-273 Big_R_gage – – 41.645 -71.613 – Big River Inside gage house 01115800 

U Pen u 255.84

USGS-274 Wood-Ward – – 41.461 -71.716 – Wood River 94 Woodville Rd

U u u 58.55

1 Elevation determined from initial GPS survey using Leica GPS equipment 
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 31

Table 1-2. High-water marks (HWMs) identified by the U.S. Army Corps of Engineers (USACE) following the March–April 2010 flood in 

Rhode Island.—Continued

[GPS_ID, unique identification number used for global position system (GPS) survey, HWM_ID, unique identifiation of a location, Lat_DD, Latitude in decimal 

degrees (North American Datum of 1983 (NAD83)), Long_DD, Longitude in decimal degrees (NAD83); DS, downstream; US, upstream; LB, left bank; RB, 

right bank; pt, point; –, not reported; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; note, meaning of some of the 

USACE descriptor abbreviations are unknown]

GPS_ID HWM_ID Lat_DD Long_DD River Description Elevation 

(feet)

ACE-1 pic 40 41.560 -71.646 Beaver River – 318.49

ACE-2 pic 41 41.559 -71.645 Beaver River – 319.25

ACE-3 pic 42 41.538 -71.641 Beaver River – 253.90

ACE-4 pic 43 41.525 -71.639 Beaver River – 236.76

ACE-5 pic 44 41.492 -71.628 Beaver River – 112.92

ACE-5A pic 45 41.498 -71.617 Beaver River #14 Schoolhouse Rd, base pole #4 NF

ACE-6 pic 46 41.464 -71.628 Beaver River – 94.15

ACE-7 Big-1 41.673 -71.608 Big River hf frr, site 7 252.55

ACE-8 Big-2 41.668 -71.607 Big River hh frr, site 6 253.32

ACE-9 Big-3 41.645 -71.613 Big River Rt 3 bridge, US LB, site 5, pt 12 NF

ACE-10 Big-4 41.645 -71.613 Big River Rt 3 bridge, DS LB, site 13, pt 13 254.81

ACE-11 Black-1 42.001 -71.498 Blackstone River Hamlet Ave., DS 118.13

ACE-12 Black-2 42.006 -71.501 Blackstone River Kendrick St. bridge 118.75

ACE-13 Black-3 42.003 -71.512 Blackstone River Court St. bridge 126.34

ACE-14 Black-4 41.999 -71.515 Blackstone River River Island Park 130.30

ACE-15 Black-5 42.002 -71.520 Blackstone River Northeast St. 152.97

ACE-16 Black-6 42.011 -71.530 Blackstone River Singleton St., US 150.77

ACE-17 hwm23 41.961 -71.641 Branch River HWM-23 304.93

ACE-18 hwm24 41.974 -71.632 Branch River HWM-24 296.31

ACE-19 pic 25 41.960 -71.643 Branch River – NF

ACE-20 hwm25 41.976 -71.630 Branch River HWM-25 291.23

ACE-21 hwm26 41.986 -71.625 Branch River HWM-26 282.31

ACE-22 hwm27 41.984 -71.623 Branch River HWM-27 272.90

ACE-23 hwm28 41.978 -71.614 Branch River HWM-28 258.65

ACE-24 hwm29 41.982 -71.618 Branch River HWM-29 271.75

ACE-25 hwm16 42.000 -71.553 Branch River HWM-16 186.00

ACE-26 hwm17 42.001 -71.552 Branch River HWM-17 180.74

ACE-27 hwm18 41.999 -71.569 Branch River HWM-18 204.64

ACE-28 hwm19 41.998 -71.573 Branch River HWM-19 207.43

ACE-29 hwm20 41.999 -71.579 Branch River HWM-20 217.02

ACE-30 hwm21 41.994 -71.596 Branch River HWM-21 126.01

ACE-31 hwm22 41.995 -71.595 Branch River HWM-22 237.12

ACE-32 bb-1 41.508 -71.716 Brushy Brook – 85.20

ACE-33 pic 23 41.942 -71.648 Chepachet River – 343.88

ACE-34 pic 24 41.957 -71.649 Clear River – 309.81

ACE-35 pic 26 41.960 -71.650 Clear River – 311.37

ACE-36 pic 28 41.966 -71.676 Clear River – NF

ACE-37 pic 29 41.971 -71.679 Clear River – 338.88

ACE-38 pic 30 41.970 -71.685 Clear River – NF

ACE-39 pic 31 41.967 -71.708 Clear River – 390.02

ACE-40 pic 32 41.966 -71.712 Clear River – 407.23
32 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island

Table 1-2. High-water marks (HWMs) identified by the U.S. Army Corps of Engineers (USACE) following the March–April 2010 flood in 

Rhode Island.—Continued

[GPS_ID, unique identification number used for global position system (GPS) survey, HWM_ID, unique identifiation of a location, Lat_DD, Latitude in decimal 

degrees (North American Datum of 1983 (NAD83)), Long_DD, Longitude in decimal degrees (NAD83); DS, downstream; US, upstream; LB, left bank; RB, 

right bank; pt, point; –, not reported; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; note, meaning of some of the 

USACE descriptor abbreviations are unknown]

GPS_ID HWM_ID Lat_DD Long_DD River Description Elevation 

(feet)

ACE-41 Cong-1 41.612 -71.623 Congdon River cm, US LB, pt 8, site 3 Destroyed

ACE-42 Cong-2 41.612 -71.623 Congdon River cm, US LB, pt 9, site 3 Destroyed

ACE-43 Cong-3 41.612 -71.623 Congdon River cm, DS LB, pt 10, site 3 278.45

ACE-44 Cong-4 41.589 -71.626 Congdon River Rt 102, 0 338.57

ACE-45 Cong-5 41.589 -71.626 Congdon River Rt 102, hp, US LB 339.48

ACE-46 pic 33 41.973 -71.750 Dry Arm Brook – 539.09

ACE-47 Flat-1 41.721 -71.684 Flat River mv fr2, US RB, site 13, pt 23 346.66

ACE-48 Flat-2 41.717 -71.663 Flat River h fr, DS RB, site 11, pt 20 280.88

ACE-49 Flat-3 41.717 -71.663 Flat River h fr, US RB, site 11, pt 21 Destroyed

ACE-50 Flat-4 41.715 -71.653 Flat River mv fr, US LB, site 9, pt 17 259.09

ACE-51 Flat-5 41.714 -71.652 Flat River mv fr, DS RB, site 9, pt 18 256.10

ACE-52 hwm8 41.677 -71.527 Hawkinson Brook – NF

ACE-53 pic 27 41.969 -71.664 Herring Brook – 319.98

ACE-54 McBk-1 41.716 -71.671 McCuster Brook f fr, US RB, site 12, pt 22 303.60

ACE-55 pic 48 41.523 -71.665 Meadow Brook – 235.25

ACE-56 pic 49 41.501 -71.665 Meadow Brook – Destroyed

ACE-57 pic 50 41.496 -71.680 Meadow Brook – 115.87

ACE-57A pic 51 41.467 -71.667 Meadow Brook Pinehill Rd., pole 19 NF

ACE-58 Mosh-1 41.871 -71.405 Moshassuck River Grotto St., upstream 38.55

ACE-59 Mosh-2 41.873 -71.408 Moshassuck River Mineral Spring Ave., US 40.41

ACE-60 Mosh-3 41.878 -71.406 Moshassuck River Weeden St., US 47.74

ACE-61 Mosh-4 41.854 -71.406 Moshassuck River Cemetary St., US 29.84

ACE-62 Mosh-5 41.856 -71.404 Moshassuck River Smithfield, US 33.33

ACE-63 Mosh-6 41.832 -71.411 Moshassuck River Smith St., US 15.94

ACE-64 Mosh-7 41.833 -71.411 Moshassuck River Mill St., DS 14.86

ACE-65 Mosh-8 41.834 -71.411 Moshassuck River Mill St., US of gage NF

ACE-66 Mosh-9 41.834 -71.411 Moshassuck River pipe US of foot bridge NF

ACE-67 Mosh-10 41.837 -71.412 Moshassuck River Stevens St., US NF

ACE-68 Mosh-11 41.836 -71.412 Moshassuck River Stevens St., DS 19.61

ACE-69 Mosh-12 41.840 -71.410 Moshassuck River Industrial St., DS 23.31

ACE-70 Mosh-13 41.842 -71.410 Moshassuck River Industrial St., US 23.68

ACE-71 Mosh-14 41.831 -71.411 Moshassuck River Smith St., DS 12.21

ACE-72 Mosh-15 41.922 -71.452 Moshassuck River Sherman Rd., US 168.03

ACE-73 Mosh-16 41.902 -71.423 Moshassuck River Table Rock Rd., US 74.31

ACE-74 Mosh-17 41.896 -71.414 Moshassuck River Barney Pond Dam, DS NF

ACE-75 Mosh-18 41.893 -71.408 Moshassuck River Barney Pond Dam, US 60.53

ACE-76 Mosh-19 41.893 -71.410 Moshassuck River Walker St., US 61.65

ACE-77 Mosh-20 41.893 -71.408 Moshassuck River dam upstream NF

ACE-78 Mosh-21 41.886 -71.408 Moshassuck River Higginson Ave., US 53.32

ACE-79 Mosh-22 41.886 -71.408 Moshassuck River Higginson Ave., DS 52.75

ACE-80 Mosh-23 41.890 -71.408 Moshassuck River pumping station 54.38
Appendix 1. High-water marks identified by the U.S. Geological Survey and the U.S. Army Corps of Engineers 33

Table 1-2. High-water marks (HWMs) identified by the U.S. Army Corps of Engineers (USACE) following the March–April 2010 flood in 

Rhode Island.—Continued

[GPS_ID, unique identification number used for global position system (GPS) survey, HWM_ID, unique identifiation of a location, Lat_DD, Latitude in decimal 

degrees (North American Datum of 1983 (NAD83)), Long_DD, Longitude in decimal degrees (NAD83); DS, downstream; US, upstream; LB, left bank; RB, 

right bank; pt, point; –, not reported; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; note, meaning of some of the 

USACE descriptor abbreviations are unknown]

GPS_ID HWM_ID Lat_DD Long_DD River Description Elevation 

(feet)

ACE-81 Noos-1 41.627 -71.633 Nooseneck River Rt 3, US LB, site 4 268.35

ACE-82 pic 47 41.446 -71.621 Pawcatuck River – 97.20

ACE-83 pic 1 41.751 -71.443 Pawtuxet River- main flag CLF WWTP 127.83

ACE-84 pic 2 41.760 -71.444 Pawtuxet River- main nail pole #1 125.59

ACE-85 pic 3 41.761 -71.431 Pawtuxet River- main nail pole #87 124.30

ACE-86 pic 4 41.761 -71.429 Pawtuxet River- main nail pole #90 121.82

ACE-87 pic 5 41.762 -71.425 Pawtuxet River- main nail pole #9057 122.81

ACE-88 pic 6 41.761 -71.425 Pawtuxet River- main Elwood Ave. bridge, 19 inches above BM 267 121.93

ACE-89 pic 7 41.761 -71.425 Pawtuxet River- main nail pole #250 122.03

ACE-90 pic 8 41.765 -71.417 Pawtuxet River- main nail pole #1/2 120.57

ACE-91 pic 9 41.768 -71.405 Pawtuxet River- main nail pole #9069 116.84

ACE-92 pic 10 41.764 -71.413 Pawtuxet River- main stake end of Tennyson 119.82

ACE-93 pic 11 41.755 -71.440 Pawtuxet River- main nail pole #38, 9 ft above ground 126.29

ACE-94 pic 12 41.757 -71.437 Pawtuxet River- main nail pole #6-50 126.14

ACE-95 pic 13 41.685 -71.552 Pawtuxet River- S. Br. stake ground, bridge #258 1221.88

ACE-96 pic 14 41.682 -71.535 Pawtuxet River- S. Br. stake ground, US old mill dam 1157.70

ACE-97 pic 15 41.682 -71.535 Pawtuxet River- S. Br. stake ground, DS old mill dam 1157.12

ACE-98 pic 16 41.686 -71.561 Pawtuxet River- S. Br. Sandy Motors, 18 inches on door 1224.56

ACE-99 hwm1 41.706 -71.520 Pawtuxet River- S. Br. paint Arctic Mill 1114.68

ACE-100 hwm2 41.708 -71.519 Pawtuxet River- S. Br. paint River Walk 186.79

ACE-101 hwm3 41.698 -71.522 Pawtuxet River- S. Br. paint rock Agawam Mills 1117.81

ACE-102 hwm4 41.696 -71.522 Pawtuxet River- S. Br. nail in lot, Agawam Mills 1130.56

ACE-103 hwm5 41.694 -71.525 Pawtuxet River- S. Br. nail fence, #13 Dale Ave. 1132.53

ACE-104 hwm6 41.685 -71.525 Pawtuxet River- S. Br. nail tree, Hope Valley Dyeing 1147.05

ACE-105 hwm7 41.687 -71.527 Pawtuxet River- S. Br. nail bldg, American Bakery Supply 1137.46

ACE-106 hwm8 41.677 -71.527 Pawtuxet River- S. Br. nail tree, #55 Turner Dr. 161.22

ACE-107 hwm9 41.695 -71.542 Pawtuxet River- S. Br. paint rock, DS Clarient Dam 1185.78

ACE-108 hwm10 41.695 -71.542 Pawtuxet River- S. Br. paint rock, 150 feet DS HWM 9 1185.10

ACE-109 hwm11 41.696 -71.542 Pawtuxet River- S. Br. nail stump, across house #519 1198.00

ACE-110 hwm12 41.690 -71.566 Pawtuxet River- S. Br. nail tree, USGS gage 1227.91

ACE-111 hwm13 41.690 -71.568 Pawtuxet River- S. Br. ground stake, behind old mill 1239.08

ACE-112 hwm14 41.694 -71.549 Pawtuxet River- S. Br. nail sapling, bike path 1222.83

ACE-113 hwm15 41.698 -71.593 Pawtuxet River- S. Br. nail tree, DS from dam 1245.35

ACE-114 Quen-1 41.579 -71.543 Queen River Rt 102, US RB, pt 3, site 1 Destroyed

ACE-115 Quen-2 41.579 -71.542 Queen River Rt 102, US LB, pt 4, site 1 192.90

ACE-116 Quen-3 41.578 -71.543 Queen River Rt 102, DS RB, pt 2, site 1 Destroyed

ACE-117 Quen-4 41.578 -71.543 Queen River – Destroyed

ACE-118 Quen-5 41.578 -71.542 Queen River Rt 102, DS LB, pt 5, site 1 Destroyed

ACE-119 Quid-1 41.706 -71.637 Quidneck Brook hf frr2, site 8, pt 16 1252.33

ACE-120 pic 21 41.902 -71.678 Stingo Brook – 1426.93

ACE-121 pic 22 41.913 -71.671 Stingo Brook – 1414.51
34 Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Central and Eastern Massachusetts

Table 1-2. High-water marks (HWMs) identified by the U.S. Army Corps of Engineers (USACE) following the March–April 2010 flood in 

Rhode Island.—Continued

[GPS_ID, unique identification number used for global position system (GPS) survey, HWM_ID, unique identifiation of a location, Lat_DD, Latitude in decimal 

degrees (North American Datum of 1983 (NAD83)), Long_DD, Longitude in decimal degrees (NAD83); DS, downstream; US, upstream; LB, left bank; RB, 

right bank; pt, point; –, not reported; Elevation, in feet above North American Vertical Datum of 1988 (NAVD 88); NF, Not Found; note, meaning of some of the 

USACE descriptor abbreviations are unknown]

GPS_ID HWM_ID Lat_DD Long_DD River Description Elevation 

(feet)

ACE-122 Whal-1 41.719 -71.665 Whaley Brook mv ut, DS RB, site 10, pt 19 Destroyed

ACE-123 wr-1 41.438 -71.722 Wood River paint base tree 154.57

ACE-124 wr-2 41.461 -71.718 Wood River nail fence 158.91

ACE-125 wr-3 41.460 -71.720 Wood River nail tree 160.99

ACE-126 wr-4 41.490 -71.715 Wood River nail base tree 169.83

ACE-127 wr-5 41.503 -71.716 Wood River nail root 181.04

ACE-128 wr-6 41.503 -71.716 Wood River paint fence 175.37

ACE-129 wr-7 41.514 -71.705 Wood River paint fence 185.88

ACE-130 wr-8 41.516 -71.703 Wood River stake 199.48

ACE-131 wr-9 41.523 -71.690 Wood River nail base tree 1102.05

ACE-132 wr-10 41.541 -71.696 Wood River nail base tree 1115.21

ACE-133 wr-11 41.572 -71.721 Wood River – NF

ACE-134 Point 1a 41.877 -71.383 Blackstone River – NF

ACE-135 Point 1b 41.878 -71.382 Blackstone River – NF

ACE-136 Point 2 41.887 -71.381 Blackstone River – 34.88

ACE-137 Point 3 41.888 -71.381 Blackstone River – 41.90

ACE-138 Point 4 41.915 -71.405 Blackstone River – NF

ACE-139 Point 5 41.925 -71.428 Blackstone River – 70.65

ACE-140 Point 6 41.930 -71.430 Blackstone River – 71.08

ACE-141 Point 7 41.927 -71.428 Blackstone River – 71.03

ACE-142 Point 8 41.952 -71.452 Blackstone River – NF

1

 Elevation determined by USACE GPS survey using Leica GPS equipment .
For additional information, write to:

Director

U.S. Geological Survey

Massachusetts Water Science Center

10 Bearfoot Road

Northborough, MA 01532

or visit our Web site at:

http://ma.water.usgs.gov/

Document prepared by the Pembroke and West Trenton Publishing 

Service Centers
Zarriello and Bent—Elevation of the March–April 2010 Flood High Water in Selected River Reaches in Rhode Island—Open-File Report 2011–1029

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