U.S. Department of the Interior

U.S. Geological Survey

Open-File Report 2007–1122

Prepared in cooperation with the Federal Emergency Management Agency

Flood of May 2006 in New Hampshire
Cover.  Photograph showing Cocheco River near Rochester, New Hampshire streamgage during the flood of May 2006.
Flood of May 2006 in New Hampshire

By Scott A. Olson

Prepared in cooperation with the Federal Emergency Management Agency

Open-File Report 2007–1122

U.S. Department of the Interior

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

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director

U.S. Geological Survey, Reston, Virginia: 2007

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reproduce any copyrighted materials contained within this report.

Suggested citation:

Olson, S.A., 2007, Flood of May 2006 in New Hampshire: U.S. Geological Survey Open-File Report 2007–1122, 32 p.
iii

Contents

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

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

Description of Study Area ...................................................................................................................1

Storm Characteristics ..........................................................................................................................1

Peak-Stage Data............................................................................................................................................2

Peak-Discharge Data....................................................................................................................................3

Flow-Frequency Analyses of the May 2006 Flooding ..............................................................................3

Comparison of the May 2006 Flood Data to Flood-Insurance Studies..................................................4

Summary..........................................................................................................................................................6

Acknowledgments.........................................................................................................................................6

Selected References.....................................................................................................................................6

Figures

1. Screenshot showing the 7-day precipitation totals ending on May 18, 2006, 

 northeastern United States..........................................................................................................2

2–3. Maps showing:

2A. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Hillsborough County, New Hampshire........................................8

2B. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Rockingham County, New Hampshire........................................9

2C. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Merrimack County, New Hampshire.........................................10

2D. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Belknap County, New Hampshire..............................................11

2E. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Strafford County, New Hampshire ............................................12

2F. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Grafton County, New Hampshire...............................................13

2G. Location of streamgages having peak stage and discharge data for the 

May 2006 flooding in Carroll County, New Hampshire ................................................14

3. Recurrence intervals of the May 2006 flood at streamgages in Hillsborough, 

Rockingham, Merrimack, Belknap, Strafford, Grafton, and Carroll Counties in 

central and southern New Hampshire.............................................................................5
iv

Tables

1. Description of streamgages used to characterize the floods of May 2006 in 

central and southern New Hampshire....................................................................................16

2. Peak-stage data and peak-discharge data for the flooding in May 2006 at 

65 streamgages in central and southern New Hampshire..................................................22

3. Flow-frequency data and recurrence interval estimates of the May 2006 flood 

for 65 streamgages in central and southern New Hampshire............................................26

4. Relation of computed May 2006 flood discharge and stage data to flood-insurance 

study data for selected streamgages in central and southern New Hampshire.............30

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square mile (mi2) 2.590 square kilometer (km2) 

Flow rate

cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)

Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 

(NGVD 29) and North American Vertical Datum of 1988 (NAVD 88).

Conversion Factors and Datums
Abstract

From May 13–17, 2006, central and southern New 

Hampshire experienced severe flooding caused by as much 

as 14 inches of rainfall in the region. As a result of the flood 

damage, a presidential disaster declaration was made on 

May 25, 2006, for seven counties—Rockingham, Hillsborough, Strafford, Merrimack, Belknap, Carroll, and Grafton. 

Following the flooding, the U.S. Geological Survey, in a 

cooperative investigation with the Federal Emergency Management Agency, determined the peak stages, peak discharges, 

and recurrence-interval estimates of the May 2006 flood at 

65 streamgages in the counties where the disaster declaration 

was made. Data from flood-insurance studies published by the 

Federal Emergency Management Agency also were compiled 

for each streamgage location for comparison purposes.

The peak discharges during the May 2006 flood were 

the largest ever recorded at 14 long-term (more than 10 years 

of record) streamgages in New Hampshire. In addition, peak 

discharges equaled or exceeded a 100-year recurrence interval 

at 14 streamgages and equaled or exceeded a 50-year recurrence interval at 22 streamgages. The most severe flooding 

occurred in Rockingham, Strafford, Merrimack, and eastern 

and northern Hillsborough Counties.

Introduction

Major flooding in central and southern New Hampshire 

from May 13–17, 2006, resulted in significant damage to 

public and personal property. Roads were damaged and 

numerous residential areas were evacuated for several days. 

As a result of the widespread damage caused by the flooding, 

President George W. Bush declared a disaster area in seven 

counties in New Hampshire on May 25, 2006. In response 

to this declaration, the U.S. Geological Survey (USGS), in 

cooperation with the Federal Emergency Management Agency 

(FEMA), measured or computed flood data at 65 streamgages 

within the disaster declaration area.

This report documents the flood of May of 2006 by presenting the flood data collected at the streamgages (48 active 

and 17 discontinued) in central and southern New Hampshire. 

The flood data include peak-stage data, peak-discharge data, 

flow-frequency curves, and estimates of flood recurrence 

intervals at each streamgage. In addition, data were compiled 

from FEMA flood-insurance studies for comparison purposes. 

The active streamgages included 37 operated by the USGS, 8 

operated by the New Hampshire Department of Environmental 

Services (NHDES), 2 operated by the U.S. Army Corps of 

Engineers (USACE), and 1 operated privately. All 17 discontinued streamgages were those that had been operated by the 

USGS. A description of each streamgage location included 

in this investigation is listed in table 1 (in back of report). All 

data contained in this report should be considered provisional 

and, therefore, subject to revision.

Description of Study Area

The New Hampshire counties declared in the disaster 

comprise a land area of 5,923 mi2 in the northeastern United 

States. Land altitudes range from sea level along the coast 

to greater than 4,000 ft NAVD 88 in the north-central part of 

New Hampshire. The climate of New Hampshire is humid. 

Precipitation is distributed fairly evenly across the state and 

averages about 43 in. per year except in regions of high elevation, which can receive an additional 10 to 15 in. of precipitation annually. The statewide average precipitation for the 

month of May is approximately 3.75 in. (Northeast Regional 

Climate Center, 2006).

Storm Characteristics

The storms of May 11–15, 2006, produced nearly 14 in. 

of rainfall in the coastal regions of New Hampshire (National 

Oceanic and Atmospheric Administration, 2006a) and up to 

11 in. in the south-central part of the state (National Oceanic 

and Atmospheric Administration, 2006b). The rainfall began 

on May 11, 2006. As an on-shore flow developed, copious 

amounts of moisture were drawn in from the Atlantic 

Ocean. The rainfall continued for more than 100 hours with 

the heaviest rainfall occurring on May 13 and 14, 2006. 

The rainfall amounts decreased abruptly in the northern 

and western regions of the state (fig. 1). In addition to the 

precipitation amounts of May 11–15, 2006, being exceptional, 

the month of May 2006 was the second wettest May in New 

Hampshire on record (National Oceanic and Atmospheric 

Administration, 2006c) and the wettest in Concord, New 

Flood of May 2006 in New Hampshire

By Scott A. Olson
Hampshire since 1868 (Erick Boehmler, Northeast River 

Forecast Center, written commun., November 3, 2006).

The amount of precipitation occurring May 11–15, 

2006, was similar to the amount of precipitation that occurred 

October 20–22, 1996, when as much as 13 in. of precipitation 

fell across southeastern New Hampshire (National Oceanic 

and Atmospheric Administration, 1996). The October 1996 

precipitation resulted in discharges that were the maximum 

for the period of record at several streamgages in southeastern 

New Hampshire. The peak discharge of October 21, 1996, 

remains the peak discharge of record at the Oyster River near 

Durham, New Hampshire, streamgage. The primary difference 

between the events of May 2006 and October 1996 was the 

wetter antecedent ground conditions in May of 2006 (National 

Oceanic and Atmospheric Administration, 2006b) resulting in 

greater discharges during May of 2006 at many streamgages.

Peak-Stage Data

At active streamgages operated by the USGS, peak 

stages were retrieved directly from the stage data recorded at 

the streamgage, along with the precise date and time of the 

peak stage. At active streamgages not operated by the USGS, 

the peak stage with date and time was provided by the operator. All peak stage data from streamgages were rated excellent, 

which means that measurements are considered to be within 

0.05 ft of the actual peak water surface.

At discontinued streamgages, USGS personnel identified and flagged the May 2006 high-water marks near the 

streamgage. The high-water marks typically consisted of 

debris lines, wash lines or mud lines left behind by the peak 

water elevation during the flood event. The flagged highwater marks were rated for accuracy. This accuracy rating is 

subjective and is based upon the type of high-water mark and 

the abundance of other confirming marks in the immediate 

vicinity (Benson and Dalrymple, 1967). The accuracy of the 

marks are defined as follows: A high-water mark having 

(1) an excellent rating is thought to be within 0.05 ft of the 

actual water surface, (2) a good rating is expected to have 

been within 0.1 ft, (3) a fair rating is within 0.2 ft, and (4) 

a poor rating may be greater then 0.2 ft from the true peak 

water surface.

The high-water marks at the discontinued streamgages 

were then referenced to the datum of the streamgage using 

closed level-loop surveying techniques. The streamgage 

datum is the local base elevation that was used in developing 

the stage-discharge relation when the streamgage was active. 

As the high-water marks were referenced to the streamgage 

datum, the marks represented the peak stages of the floodFigure 1. The 7-day precipitation totals ending on May 18, 2006, northeastern United States. (From Northeast River Forecast Center, 

2006.)

   Flood of May 2006 in New Hampshire
ing at the discontinued streamgage. The estimated date of the 

peak stages at discontinued streamgages was estimated from 

observations by residents living near the streamgage or from 

peak-stage hydrographs from active streamgages in the same 

or adjacent watersheds.

If a FEMA flood-insurance study containing flood-water 

elevations was available for the location of the discontinued 

or active streamgage, the peak stage at the streamgage was 

referenced to the National Geodetic Vertical Datum of 1929 

(NGVD 29) and the North American Vertical Datum of 1988 

(NAVD 88) using closed level-loop surveying techniques. 

Referencing the peak stage to NGVD 29 and NAVD 88 allows 

the high-water mark to be compared to the existing FEMA 

flood-insurance study data at the streamgage location. Other 

selected streamgages also were referenced to NGVD 29 and 

NAVD 88 regardless of the availability of a flood-insurance 

study at the streamgage location. The peak-stage data for all 

sites included in this investigation are shown in table 2 (in 

back of report). The location of each streamgage is shown, by 

county, in figures 2A–2G (in back of report).

Peak-Discharge Data

Peak discharges for most streamgages were determined 

by applying the peak stage to the most current stage-discharge 

relation developed for the streamgage. At discontinued 

streamgages there is the possibility that the stage-discharge 

relation has changed during the years that the site has been 

inactive. Each of the discontinued streamgages, however, is at 

a site having a stable channel or control, and the most recent 

stage-discharge relation available for the site will provide 

reasonable results.

There were four exceptions to using the stage-discharge 

relation for determining the peak discharge of the May 2006 

flood:

At 12 streamgages (table 2, footnote b), the current stagedischarge relation was undeveloped for the unusually 

large peak stage. In such cases, the stage-discharge relation was graphically extended to the peak stage using the 

trend of the upper end of the stage-discharge relation. The 

error introduced to the peak-discharge value is unknown 

when extending the stage-discharge relation without 

manually measured discharges.

At three streamgages (table 2, footnote d), backwater from 

hydraulic conditions in the channel downstream of the 

streamgage prevented the use of the stage-discharge relation to determine the peak discharge from the peak stage. 

The peak discharges at these streamgages are unknown. 

All three of these streamgages had been discontinued.

At active streamgage 01100561, Spicket River near 

Methuen, MA (table 2, footnote n), there was a variable 

backwater condition during the May 2006 flooding. At 

the time of this publication, a peak discharge had not 

1.

2.

3.

been computed; however, a discharge measurement of 

2,260 ft3/s was made at a stage of 11.91 ft. The peak stage 

of the May 2006 flood was 12.15 ft.

At discontinued streamgage 01091000, South Branch Piscataquog River near Goffstown, NH (table 2, footnote l), 

the gage house and datum reference marks were destroyed 

during the construction of a new bridge prior to the May 

2006 flood. Because the reference marks were destroyed, 

it was not possible to tie the high-water marks flagged 

at the site to the streamgage datum. Without high-water 

marks tied to the streamgage datum, the stage-discharge 

relation for the streamgage could not be used. The bridge, 

however, provided sufficient river constriction, and 

enough high-water marks were available upstream and 

downstream of the bridge to allow a discharge estimate to 

be made at the bridge using indirect techniques (Matthai, 

1967). At this site, the high-water marks downstream of 

the bridge, the bridge opening, and channel and floodplain 

cross sections upstream and downstream of the bridge 

were surveyed and input into the U.S. Army Corps of 

Engineers (2006a) HEC-RAS program. Discharges were 

iteratively selected and input into the HEC-RAS program 

so that the resulting water-surface elevation output from 

the program matched the high-water marks surveyed 

upstream of the bridge. This hydraulic model calibrated to 

the high-water marks resulted in a discharge of 7,180 ft3/s.

At 14 long-term (more than 10 years of record) 

streamgages, the peak discharge from the May 2006 flood was 

the maximum discharge for the period of record. These 14 

streamgages are listed in table 2 with discharges with footnote “c” and include 2 streamgages with very long periods of 

record—Lamprey River near Newmarket (active since 1934) 

and Warner River at Davisville (period of record from 1940 to 

1978 and 1999 to the present). The peak-discharge data for all 

sites included in this investigation are given in table 2.

Flow-Frequency Analyses of the 

May 2006 Flooding

Flow-frequency curves were determined for all 65 

streamgages included in this investigation. For 37 of the 65 

streamgages, the guidelines in Bulletin 17B (U.S. Interagency 

Advisory Committee on Water Data, 1982) were used to 

determine flow-frequency curves. Bulletin 17B recommends 

the use of a log-Pearson Type III distribution for estimating 

flow frequency and provides procedures for weighting station 

skews, historical peaks, and detecting and treating outliers and trends. Software developed by the USGS to analyze 

peak-flow frequency (PeakFQ) was used for these computations (U.S. Geological Survey, 2006a). The peak-flow data 

used as input to the PeakFQ program were retrieved from the 

National Water Information System (U.S. Geological Survey, 

2006b). When computing the flow-frequency curves, if peak 

4.

Flow-Frequency Analyses of the May 2006 Flooding 
discharges at a streamgage were affected by regulation, the 

station skew—without weighting from the generalized skew 

as described in Bulletin 17B—was used for computing the frequency curve. If the May 2006 peak discharge was the annual 

peak for the 2006 water year, it was added to the peak-flow 

data prior to computing the frequency curves.

For 11 of the 65 streamgages, flood-control structures 

operated by the USACE are present in the basin. Flowfrequency data for 8 of these 11 streamgages were obtained 

from frequency curves developed by the USACE and 

published in FEMA flood-insurance studies (table 3, in back 

of report; footnote a). At 3 of the 11 streamgages, the flowfrequency curve published in the FEMA flood-insurance study 

was not developed by the USACE, and the flow-frequency 

curve was re-computed for this study following the Bulletin 

17B guidelines and incorporating peak-flow data since the 

flood-control structures were constructed.

At 16 of the 65 streamgages in this investigation, the 

record length was insufficient—less than 10 years—for a 

flow-frequency analysis. (Bulletin 17B recommends at least 

10 years.) At these sites, the flow-frequency curves were computed using the regression equations for estimating flow frequency developed by LeBlanc (1978). The resulting frequency 

curves were not adjusted for urbanization or regulation.

At one site, station 01080000, Lake Winnipesaukee at 

Weirs Beach, only stage data are available. The frequency 

data for this site were obtained from the flood-insurance study 

for the city of Laconia (Federal Emergency Management 

Agency, 1980a).

Results of the flow-frequency analyses are shown in 

table 3. The recurrence interval of the May 2006 peak flow at 

each streamgage was determined using the frequency analysis 

results. Peak discharge equaled or exceeded a 50-year flood 

at 22 streamgages; 20 of these were located in Rockingham, 

Merrimack, Strafford or northern and eastern Hillsborough 

Counties (fig. 3). Peak discharge equaled or exceeded a 

100-year flood at 14 streamgages:

North River above NH125, near Lee;

Lamprey River near Newmarket;

Exeter River at Haigh Road, near Brentwood;

Dudley Brook near Exeter;

Mill Brook near NH108, at Stratham;

Winnicut River at Greenland, near Portsmouth;

Berrys Brook at Sagamore Road, near Portsmouth;

Little River at Woodland Road, near Hampton;

Poorfarm Brook near Gilford;

 Warner River at Davisville;

 Soucook River near Concord;

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

Soucook River at Pembroke Road, near Concord;

South Branch Piscataquog River near Goffstown; and

Merrimack River near Goffs Falls, below Manchester.

Comparison of the May 2006 Flood Data 

to Flood-Insurance Studies

FEMA flood-insurance studies provide communities with 

discharges and water-surface-elevation profiles for the 10-, 

50-, 100-, and 500-year floods for many water courses around 

which development has or is expected to occur. These data 

are used for planning purposes and for setting flood-insurance 

rates for structures within communities participating in the 

National Flood-Insurance Program. For streamgage locations included within a flood-insurance study, discharges and 

peak water-surface elevations (stage) were compiled from the 

appropriate study and are given in table 4 (in back of report). 

Discharges were obtained from the Summary of Discharges 

table for the reach that incorporated the streamgage location, and the peak water-surface elevations were extracted 

from the water-surface-elevation profiles. In cases where the 

streamgage location was not identified on the water-surfaceelevation profiles, interpretation of the streamgage location 

was required.

The compiled flood-insurance study data are shown 

along with the peak stage and peak discharge for the May 

2006 flood in table 4. The flow-frequency data obtained from 

the flood-insurance studies (table 4) often differ from the 

flow-frequency data determined for this investigation 

(table 3), because the methods used for determining the 

frequency curves and the availability of data for developing 

the frequency curves may be different.

In addition, the data in table 4 indicates that the watersurface-elevation profiles for some communities may need to 

be updated. For instance, at streamgage 01091500, Piscataquog River near Goffstown, the peak discharge in May 2006 

was 10,100 ft3/s. The recurrence interval for this discharge, 

as reported in the Goffstown flood-insurance study (Federal 

Emergency Management Agency, 1978b) is between 50 and 

100 years. One would expect the peak stage in May 2006 to 

fall between the 50- and 100-year water-surface-elevation 

profiles at this location; however, the peak stage for the 

May 2006 flood was 187.20 ft NGVD 29, which is greater 

than the 100-year water-surface-elevation reported in the 

Goffstown flood-insurance study. There are 14 streamgage 

sites at which the observed peak discharge of the May 2006 

flood is bracketed by different recurrence intervals than the 

recurrence intervals that bracket the observed stage or watersurface elevation (table 4). These discrepancies could be 

due to changes to the river channel, changes in land use, or 

changes to other physical data used in the hydraulic modeling 

performed for the study.

12.

13.

14.

 Flood of May 2006 in New Hampshire
Figure 3. Recurrence 

intervals of the May 2006 

flood at streamgages 

in Hillsborough, 

Rockingham, Merrimack, 

Belknap, Strafford, 

Grafton, and Carroll 

Counties in central 

and southern New 

Hampshire.

Comparison of the May 2006 Flood Data to Flood-Insurance Studies 

Coos

Grafton

Merrimack

Carroll

Belknap

Cheshire

Sullivan

Hillborough Rockingham

Strafford

0 5 10 20 MILES

0 5 10 20 KILOMETERS

EXPLANATION

Lake

County boundary

River

Recurrence interval of peak discharge

at streamgages, May 2006.

Less than 10-year flood

10- to less than 50-year flood

50- to less than 100-year flood

Equal to or greater than 100-year flood

Recurrence interval unknown

72°

71°

43°

44°

45°

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

National Hydrography Dataset, 1:24,000, 1999
Summary

From May 13–17, 2006, central and southern New 

Hampshire experienced severe flooding caused by as much 

as 14 in. of rainfall in the region, and seven counties were 

declared a disaster area. The U.S. Geological Survey, in a 

cooperative investigation with the Federal Emergency Management Agency (FEMA), measured or computed flood data 

at 65 streamgages in the disaster area. These data include peak 

stages, peak discharges, and recurrence interval estimates for 

the May 2006 flooding and data compiled from FEMA floodinsurance studies for comparison purposes.

At 14 long-term (more than 10 years of record) 

streamgages, the peak discharge in May 2006 was the maximum discharge for the period of record. These streamgages 

include the Lamprey River near Newmarket (active since 

1934), and Warner River at Davisville, (period of record from 

1940 to 1978 and 1999 to the present). At the Merrimack 

River at Goffs Falls in Manchester, NH, the May 2006 peak 

discharge of 74,700 ft3/s was exceeded only by the historical 

floods of 1936 and 1938. Peak discharges equaled or exceeded 

a 100-year recurrence interval at 14 streamgages and equaled 

or exceeded a 50-year recurrence interval at 22 streamgages. 

The most severe flooding was in Rockingham, Strafford, Merrimack, and eastern and northern Hillsborough Counties.

Acknowledgments

The author would like to thank Steve Doyon from 

NHDES for providing peak-stage and peak-discharge data 

from the streamgages that NHDES operates. Thanks also go 

to Curtis Crow, Kerrie Hartshorn and other staff from the New 

Hampshire Department of Transportation’s (NHDOT) Survey 

Unit for providing elevation control point data and setting 

temporary elevation reference marks near select streamgages. 

Finally, the author would like to express appreciation to USGS 

staff: Kenneth Toppin, Chandlee Keirstead, Heather Sirotnak, 

Jeffrey Grey, Robert Flynn, Glenn Berwick, Richard Kiah, 

and Sanborn Ward—who assisted with collection and analysis of the data in this report, and Gregory Stewart and Robert 

Flynn—who provided technical reviews of this investigation.

Selected References

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.

Federal Emergency Management Agency, 1977, Flood-insurance study, Town of Henniker, Merrimack County, New 

Hampshire: Washington, DC, 15 p.

Federal Emergency Management Agency, 1978a, Floodinsurance study, Town of Chichester, Merrimack County, 

New Hampshire: Washington, DC, 15 p.

Federal Emergency Management Agency, 1978b, Floodinsurance study, Town of Goffstown, Hillsborough County, 

New Hampshire: Washington, DC, 18 p.

Federal Emergency Management Agency, 1978c, Floodinsurance study, Town of Hillsborough, Hillsborough 

County, New Hampshire: Washington, DC, 20 p.

Federal Emergency Management Agency, 1979a, Floodinsurance study, City of Franklin, Merrimack County, 

New Hampshire: Washington, DC, 20 p.

Federal Emergency Management Agency, 1979b, Floodinsurance study, Town of Merrimack, Hillsborough County, 

New Hampshire: Washington, DC, 27 p.

Federal Emergency Management Agency, 1979c, Floodinsurance study, Town of Pelham, Hillsborough County, 

New Hampshire: Washington, DC, 22 p.

Federal Emergency Management Agency, 1979d, Floodinsurance study, Town of Peterborough, Hillsborough 

County, New Hampshire: Washington, DC, 21 p.

Federal Emergency Management Agency, 1980a, Floodinsurance study, City of Laconia, Belknap County, 

New Hampshire: Washington, DC, 24 p.

Federal Emergency Management Agency, 1980b, Floodinsurance study, City of Manchester, Hillsborough County, 

New Hampshire: Washington, DC, 24 p.

Federal Emergency Management Agency, 1980c, Floodinsurance study, Town of Antrim, Hillsborough County, 

New Hampshire: Washington, DC, 20 p.

Federal Emergency Management Agency, 1982, Floodinsurance study, Town of Rumney, Grafton County, 

New Hampshire: Washington, DC, 15 p.

Federal Emergency Management Agency, 1987, Floodinsurance study, Town of Warner, Merrimack County, 

New Hampshire: Washington, DC, 18 p.

Federal Emergency Management Agency, 1988a, Floodinsurance study, Town of Canaan, Grafton County, 

New Hampshire: Washington, DC, 23 p.

Federal Emergency Management Agency, 1988b, Floodinsurance study, Town of Hopkinton, Merrimack County, 

New Hampshire: Washington, DC, 16 p.

Federal Emergency Management Agency, 1990a, Floodinsurance study, Town of Haverhill, Grafton County, 

New Hampshire: Washington, DC, 10 p.

   Flood of May 2006 in New Hampshire
Federal Emergency Management Agency, 1990b, Floodinsurance study, Town of Lebanon, Grafton County, 

New Hampshire: Washington, DC, 16 p.

Federal Emergency Management Agency, 1991, Floodinsurance study, Town of Tamworth, Carroll County, 

New Hampshire: Washington, DC, 12 p.

Federal Emergency Management Agency, 1993a, Floodinsurance study, Town of Weare, Hillsborough County, 

New Hampshire: Washington, DC, 16 p.

Federal Emergency Management Agency, 1993b, Floodinsurance study, Town of Webster, Merrimack County, 

New Hampshire: Washington, DC, 10 p.

Federal Emergency Management Agency, 1997, Floodinsurance study, Town of Tilton, Belknap County, 

New Hampshire: Washington, DC, 20 p.

Federal Emergency Management Agency, 1999, Floodinsurance study, City of Concord, Merrimack County, 

New Hampshire: Washington, DC, 20 p.

Federal Emergency Management Agency, 2000a, Floodinsurance study, Town of Lincoln, Grafton County, 

New Hampshire: Washington, DC, 11 p.

Federal Emergency Management Agency, 2000b, Floodinsurance study, Town of Woodstock, Grafton County, 

New Hampshire: Washington, DC, 15 p.

Federal Emergency Management Agency, 2001a, Floodinsurance study, Town of New Boston, Hillsborough 

County, New Hampshire: Washington, DC, 18 p.

Federal Emergency Management Agency, 2001b, Floodinsurance study, Town of Plymouth, Grafton County, 

New Hampshire: Washington, DC, 18 p.

Federal Emergency Management Agency, 2002, Floodinsurance study, Town of Conway, Carroll County, 

New Hampshire: Washington, DC, 21 p.

Federal Emergency Management Agency, 2005a, Floodinsurance study, Rockingham County, New Hampshire, 

all jurisdictions: Washington, DC, 87 p.

Federal Emergency Management Agency, 2005b, Floodinsurance study, Strafford County, New Hampshire, 

all jurisdictions: Washington, DC, 41 p.

LeBlanc, D.R., 1978, Progress report on hydrologic 

investigations of small drainage areas in New Hampshire—

Preliminary relations for estimating peak discharge on 

rural, unregulated streams: U.S. Geological Survey WaterResources Investigations 78–47, 9 p.

Matthai, H.F., 1967, Measurement of peak discharge at width 

contractions by indirect methods: U.S. Geological Survey 

Techniques of Water-Resources Investigations, book 3, 

chap. A4, 44 p.

National Oceanic and Atmospheric Administration, 1996, 

Climatological data—New England, October 1996: 

Climatological Data, v. 108, no. 10, 46 p.

National Oceanic and Atmospheric Administration, 2006a, 

Record of climatological observations (COOP), accessed 

November 17, 2006, at http://www7.ncdc.noaa.gov/IPS/

coopgetpublications.html.

National Oceanic and Atmospheric Administration, 2006b, 

Public information statement, accessed November 2, 1996, 

at http://www.ncdc.noaa.gov/oa/climate/research/2006/may/

boxpns.txt.

National Oceanic and Atmospheric Administration, 2006c, 

Climate of 2006—May in historical perspective, accessed 

November 2, 2006, at http://www.ncdc.noaa.gov/oa/climate/

research/2006/may/may06.html.

Northeast Regional Climate Center, 2006, Monthly and seasonal climate summary tables, accessed November 2, 2006, 

at http://met-www.cit.cornell.edu/climate/climate_summary.

html.

Northeast River Forecast Center, 2006, 7-day observed 

precipitation—valid May 18, 2006, 1200 UTC, accessed 

November 7, 2006, at http://www.ncdc.noaa.gov/img/

climate/research/2006/may/ne-rainfall.gif.

U.S. Army Corps of Engineers, 2006a, HEC-RAS river analysis system, version 3.1.3: Hydrologic Engineering Center, 

accessed November 2, 2006, at http://www.hec.usace.army.

mil.

U.S. Army Corps of Engineers, 2006b, New England District 

Corps of Engineers reservoir regulation team, accessed 

November 8, 2006, at http://www.nae.usace.army.mil/.

U.S. Geological Survey, 2006a, Water resources application 

software, PeakFQ, accessed November 6, 2006, at 

http://water.usgs.gov/software/peakfq.html.

U.S. Geological Survey, 2006b, Peak streamflow for 

New Hampshire: National Water Information System, 

accessed November 6, 2006, at http://nwis.waterdata.usgs.

gov/nh/nwis/peak .

U.S. Interagency Advisory Committee on Water Data, 1982, 

Guidelines for determining flood flow frequency, Bulletin 

17–B of the Hydrology Subcommittee: Reston, VA, 

U.S. Geological Survey, Office of Water Data Coordination, 183 p.

Selected References 
Figure 2A. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Hillsborough 

County, New Hampshire.

 Flood of May 2006 in New Hampshire

Beards Brook

North Branch

near Antrim

Souhegan River

at Merrimack

Beaver Brook

at North Pelham

Beards Brook

near Hillsborough

Piscataquog River

near Goffstown

Contoocook River

at Peterborough

South Branch

Piscataquog River

near Goffstown

Merrimack River

near Goffs Falls,

below Manchester

Piscataquog River

below Everett Dam,

near East Weare

Nubanusit Brook

below MacDowell Dam

near Peterborough

Hillsborough County

New Hampshire

Massachusetts

Souhegan River

Warner River

Contoocook River

Piscataquog River

North Branch

Suncook

River

Soucook

River

Merrimack

River

Beaver Brook

Blackwater River

Merrimack River

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS

EXPLANATION

Streamgage

County boundary

72° 71°30'

42°45'

43°

43°15'

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999
Figure 2B. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Rockingham 

County, New Hampshire.

Figure 2B 

Winnicut River

at Greenland,

near Portsmouth

Berrys Brook

at Sagamore Road,

near Portsmouth

New

Hampshire

Sucker Brook

at Auburn

Dudley Brook

near Exeter

Spicket River

at North Salem

Spicket River

near Methuen, MA

Mill Brook

near NH108,

at Stratham

Beaver Brook

at South Road,

near Derry

Policy Brook

at I-93 Rest Stop,

near Salem

Exeter River

at Haigh Road,

near Brentwood

Little River

at Woodland Road,

near Hampton

Taylor River

at Old Stage Road,

near Hampton

Hampton Falls River

at Mill Lane,

near Seabrook

Tributary to

Cobbetts Pond

at I-93 Exit Ramp,

near Windham

Rockingham

County

New Hampshire

Maine

Suncook River

Lamprey River

North River

Exeter River

Isinglass River

Merrimack River

Massachusetts

Beaver Brook

Spicket River

Soucook River

Oyster

River

Cocheco River

71°30' 71°

42°45'

43°

43°15'

EXPLANATION

Streamgage

County boundary

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS
Figure 2C. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Merrimack 

County, New Hampshire.

10 Flood of May 2006 in New Hampshire

Winnipesaukee River

Winnipesaukee

Lake

#

# #

#

#

#

#

# #

# #

#

Smith River

near Bristol

Merrimack River

at Concord

Warner River

at Davisville

Soucook

River near

Concord

Blackwater

River near

Webster

Contoocook

River near

Henniker

Suncook

River at North

Chichester

Merrimack River

at Franklin Junction

West Branch

Warner River

near Bradford

Soucook River at

Pembroke Road,

near Concord

Contoocook River

at River Hill,

near Penacook

Contoocook River

below Hopkinton Dam

at West Hopkinton

Merrimack County

Warner River

Merrimack River

Blackwater River

Smith River

North Branch

Contoocook River

Pemigewasset River

Soucook River

Piscataquog River

Suncook River

72° 71°30'

43°

43°30'

EXPLANATION

# Streamgage

County boundary

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS
Figure 2D. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Belknap 

County, New Hampshire.

Figure 2D 11

Winnipesaukee River Winnipesaukee

Lake

Winnipesaukee

River at Tilton

Pemigewasset River

Cocheco River

Salmon

Falls River

Maine

New Hampshire

Squam

Lake

Poorfarm

Brook near

Gilford

Lake

Winnipesaukee

at Weirs Beach

Lake Winnipesaukee

Outlet at Lakeport

Belknap County

Soucook River

71°30' 71°

43°30'

43°45'

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS

EXPLANATION

Streamgage

County boundary

Suncook River

Bearcamp River

Merrimack River

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999
Figure 2E. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Strafford 

County, New Hampshire.

12 Flood of May 2006 in New Hampshire

Cocheco

River

Cocheco River

at Spaulding Turnpike,

at Dover

Oyster River

near Durham

Cocheco River

near Rochester

Lamprey River

near Newmarket

Salmon Falls River

at Milton

North River

above NH125,

near Lee

Mohawk Brook

near

Center Strafford

Isinglass River

at Rochester Neck Road,

near Dover

Strafford

County New Hampshire

Maine

Suncook River

Lamprey River

North River

Isinglass River

Oyster

River

Sa ml on Falls River

Soucook River

Lake Winnipesaukee

Great

Bay

71°15' 71° 70°45'

43°15'

43°30'

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS

EXPLANATION

Streamgage

County boundary

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999
Figure 2F. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Grafton County, 

New Hampshire.

Figure 2F 13

Connecticut River

at West Lebanon

Squam Lake

New Hampshire

Vermont

Mink Brook near Etna

Squam River 

at Ashland

Baker River near Rumney

Mascoma River

at Mascoma

Mascoma River

at West Canaan

Stevens Brook near Wentworth

Pemigewasset River

at Plymouth

Pemigewasset River at Woodstock

Connecticut River at Wells River

Ammonoosuc River

at Bethlehem Junction

East Branch Pemigewasset River

at Lincoln

Newfound River

below Newfound Lake

near Bristol

Grafton County

Connecticut River

Pemigewasset River

Ammonoosuc River

Mascoma River

Lake

Winnipesaukee

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS

Smith River

EXPLANATION

Streamgage

County boundary

Baker River

72° 71°30'

43°45'

44°

44°15'

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

National Hydrography Dataset, 1:24,000, 1999
Figure 2G. Location of streamgages having peak stage and discharge data for the May 2006 flooding in Carroll County, 

New Hampshire.

14  Flood of May 2006 in New Hampshire

Winnipesaukee

Lake 

Pemigewasset River

Ammonoosuc River

Squam

Lake

Saco River

near Conway

Bearcamp River

at South Tamworth

Ossipee River

at Effingham Falls Shannon Brook

near Moultonborough

Carroll County

Maine

New Hampshire

Saco River

Ossipee River

71°30' 71°

43°30'

44°

Bearcamp River

0 2.5 5 10 MILES

0 2.5 5 10 KILOMETERS

EXPLANATION

Streamgage

County boundary

Base from U.S. Geological Survey Digital Line Graphs, 1:24,000, 1990−94 and 

 National Hydrography Dataset, 1:24,000, 1999
Tables 1–4
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01064500 Saco River near Conway Active USGS 385 Lat 43°59'27", long 71°05'29", Carroll County, on left bank, at Odell Falls, 0.4 mi upstream of 

US Route 302, 1.5 mi northeast of the intersection of State Routes 16 and 113 in Conway, 1.8 mi downstream of mouth of Swift River.

01064801 Bearcamp River at 

South Tamworth

Active USGS 67.6 Lat 43°49'48", long 71°17'18", Carroll County, on right bank, at downstream side of abandoned 

stone abutments, 0.7 mi upstream of Sanger Brook, 0.8 mi east of Bemis Mountain Road and State Route 25 intersection at South Tamworth, 1.0 mi downstream of Cold Brook, and 1.1 mi west of State Route 25 and State Route 113 intersection at Whittier.

01065000 Ossipee River at 

Effingham Falls

Active NHDESa 330 Lat 43°47'42", long 71°03'35", Carroll County, on left bank, 850 ft upstream of State Route 153 

bridge, 1,400 ft downstream of dam at outlet of Ossipee Lake, and 0.2 mi west of the intersection of State Routes 153 and 25 at Effingham Falls.

01072100 Salmon Falls River at Milton Active NHDESa 108 Lat 43°24'48", long 70°59'15", Strafford County, on right bank, just downstream of Milton Pond 

Dam and 300 ft southeast of State Route 125 and Prospect Hill Road intersection in Milton.

01072800 Cocheco River near 

Rochester

Active USGS 85.7 Lat 43°16'06", long 70°58'27", Strafford County, on right bank, directly behind Rochester 

Country Club, 2,200 ft upstream of treatment lagoons, and 0.5 mi southeast of Main Street and Church Street intersection in Gonic.

01072850 Mohawk Brook near 

Center Strafford

Discontinued USGS 8.87 Lat 43°15'47", long 71°05'50", Strafford County, on left bank, 1,900 ft downstream of 

State Route 202A bridge, and 1.5 mi east of the intersection of State Routes 126 and 202A in Center Strafford.

01072870 Isinglass River at Rochester 

Neck Road, near Dover

Active USGS 73.6 Lat 43°14'05", long 70°57'25", Strafford County, 600 ft upstream of Rochester Neck Road 

bridge, and 0.7 mi upstream of mouth on Cocheco River.

01072880 Cocheco River at Spaulding 

Turnpike, at Dover

Active Privatea 173 Lat 43°12'21", long 70°53'47", Strafford County, on right bank, 100 ft downstream of 

Spaulding Turnpike bridge over Cocheco River.

01073000 Oyster River near Durham Active USGS 12.1 Lat 43°08'55", long 70°57'56", Strafford County, on left bank, 50 ft upstream of Old Concord 

Road bridge, and 0.6 mi east of US Route 4 and State Route 155 intersection.

01073460 North River above NH125, 

near Lee

Activeb USGS 35.6 Lat 43°05'01", long 71°02'32", Strafford County, 2,500 ft upstream of State Route 125 bridge, 

and 1.6 mi upstream of mouth on Lamprey River.

01073500 Lamprey River near 

Newmarket

Active USGS 183 Lat 43°06'09", long 70°57'11", Strafford County, on right bank, 200 ft upstream of Packers Falls 

and Packer Falls Road bridge.

01073587 Exeter River at Haigh Road, 

near Brentwood

Active USGS 63.5 Lat 42°59'04", long 71°02'20", Rockingham County, on right bank, 10 ft downstream of 

Haigh Road Bridge.

01073600 Dudley Brook near Exeter Discontinued USGS 4.97 Lat 42°59'35", long 71°01'20", Rockingham County, on right bank, upstream side of breached 

dam, 100 ft upstream of State Route 111A culvert, and 180 ft west of State Route 111A and Deer Hill Road intersection.

01073750 Mill Brook near NH108, 

at Stratham

Discontinued USGS 2.3 Lat 43°01'24", long 70°55'04", Rockingham County, on right bank, at downstream most culvert 

of the Stratham traffic circle at the intersection of State Routes 108 and 33 in Stratham.

16 Flood of May 2006 in New Hampshire
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01073785 Winnicut River at Greenland, 

near Portsmouth

Active USGS 14.1 Lat 43°02'12", long 70°50'55", Rockingham County, on left bank, 20 ft upstream of State Fish 

and Game Department dam, 150 ft downstream of State Route 33 bridge, and 1.1 mi west of the intersection of State Routes 33 and 151 in Greenland.

01073810 Berrys Brook at Sagamore 

Road, near Portsmouth

Discontinued USGS 5.38 Lat 43°02'10", long 70°44'59", Rockingham County, on right bank, at upstream side of 

Sagamore Road, 0.7 mi south of State Route 1A and Sagamore Road intersection at Foyers Corner in Rye.

01073822 Little River at Woodland 

Road, near Hampton

Activeb USGS 6.12 Lat 42°57'53", long 70°47'51", Rockingham County, on left bank, at upstream side of 

Woodland Road, and 275 ft north of Woodland Road and State Route 111 intersection in North Hampton. 

01073838 Taylor River at Old Stage 

Road near Hampton

Discontinued USGS 8.41 Lat 42°56'33", long 70°52'40", Rockingham County, on left bank, at upstream side of dam, 

100 ft upstream of Old Stage Road bridge, and 650 ft southwest of Old Stage Road and Timber Swamp Road intersection at Coffins Mill in Hampton.

01073848 Hampton Falls River at 

Mill Lane, near Seabrook

Discontinued USGS 3.61 Lat 42°54'11", long 70°54'05", Rockingham County, on right bank, 150 ft north of Mill Lane 

and Weare Road intersection, 500 ft upstream of Mill Lane culvert, and 1.6 mi northwest of US Route 1 and State Route 107 intersection in Seabrook.

01074520 East Branch Pemigewasset 

River at Lincoln

Active USGS 115 Lat 44°02'51", long 71°39'37", Grafton County, on right bank, at upstream side of old crib 

dam, locally known as “the old hole,” 800 ft upstream of Cooper Memorial Drive bridge, 1,900 ft downstream of Pollard Brook, 1.8 miles above mouth, 0.8 mi east of Connector Road and State Route 112 intersection in Lincoln.

01075000 Pemigewasset River at 

Woodstock

Active USGS 193 Lat 43°58'34", long 71°40'48", Grafton County, on right bank at downstream side of abandoned 

bridge abutments, immediately east of Woodstock Fire Station, 300 ft upstream of southern most State Route 175 bridge, and 300 ft east of North Station Road and State Route 175 intersection in Woodstock.

01075800 Stevens Brook near 

Wentworth

Discontinued USGS 2.94 Lat 43°50'10", long 71°53'09", Grafton County, on left bank, 150 ft upstream of Buffalo Road 

bridge, 250 ft southeast of Zoe Road and Buffalo Road intersection, 1,800 ft upstream of mouth, and 1.7 mi northwest of Sand Hill Road and State Route 25.

01076000 Baker River near Rumney Active USGS 143 Lat 43°47'44", long 71°50'45", Grafton County, on right bank, 200 ft upstream of small right 

bank tributary, 1,900 ft upstream of mouth of Halls Brook, 1,400 ft west of Halls Brook Road and State Route 25 intersection, 1.7 mi southeast of Sand Hill Road and State Route 25 intersection in West Rumney.

01076500 Pemigewasset River at 

Plymouth

Active USGS 622 Lat 43°45'33", long 71°41'10", Grafton County, on right bank, 150 ft downstream of 

Holderness Road bridge in Plymouth, 1,700 ft downstream of Baker River, and 0.8 mi south of State Route 3A and US Route 3 intersection.

01077000 Squam River at Ashland Active NHDESa 57.6 Lat 43°42'19", long 71°37'49", Grafton County, on right bank, 250 ft downstream of the 

Little Squam Lake Dam, 300 ft upstream of River Street bridge, and 300 ft north of River Street and US Route 3 intersection.

Table 1 17
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01077510 Newfound River below Newfound Lake near Bristol Active NHDES 98 Lat 43°37'02", long 71°44'28", Grafton County, at outlet of Newfound Lake, 75 ft downstream of Newfound Lake Dam, 500 ft downstream of West Shore Road, and 800 ft west of West 

Shore Road and State Route 3A intersection in Bristol.

01078000 Smith River near Bristol Active USGS 85.8 Lat 43°33'59", long 71°44'54", Merrimack County, on right bank, 2,200 ft north of Borough 

Road and Axtell Road intersection, and 4,700 ft upstream of Borough Road Bridge in Bristol. 

01079602 Poorfarm Brook near Gilford Discontinued USGS 6.38 Lat 43°34'22", long 71°21'20", Belknap County, on right bank, at downstream side of Scenic 

Drive bridge, 250 ft downstream of State Route 11, 500 ft west of Scenic Drive and State Route 11 intersection, 950 ft upstream of mouth on Lake Winnipesaukee.

01079900 Shannon Brook near 

Moultonborough

Discontinued USGS 6.99 Lat 43°43'49", long 71°21'28", Carroll County, on left bank, immediately upstream of State 

Route 109 bridge (gage house is 20 ft downstream of bridge), 3,800 ft south of the intersection of State Routes 109 and 171 in Moultonborough, and 1.4 mi upstream of mouth on Lake Winnipesaukee.

01080000 Lake Winnipesaukee at 

Weirs Beach

Active NHDESa 363 Lat 43°36'27", long 71°27'34", Belknap County, 600 ft east of Weirs Beach Post Office, 0.3 mi 

northwest of US Route 3 bridge across Paugus Bay at Weirs Beach.

01080500 Lake Winnipesaukee Outlet 

at Lakeport

Active NHDESa 363 Lat 43°32'57", long 71°27'54", Belknap County, 100 ft upstream of Elm Street bridge across 

Paugus Bay, 150 ft upstream of dam across Paugus Bay, 0.2 mi northwest of Elm Street and Union Avenue intersection in Lakeport.

01081000 Winnipesaukee River at 

Tilton

Active USGS 471 Lat 43°26'30", long 71°35'17", Belknap County, on right bank, 150 ft upstream of Bridge/

School Street bridge, 300 ft south of Town Hall in Tilton, 0.3 mi southeast of US Route 3 and State Route 132 intersection in Tilton.

01081500 Merrimack River at 

Franklin Junction

Active USGS 1,507 Lat 43°25'22", long 71°39'12", Merrimack County, on right bank, at Franklin Junction, 

4,000 ft south of State Route 127 and US Route 3 intersection, 5,300 ft downstream of confluence of Pemigewasset and Winnipesaukee Rivers, 1.5 mi south of US Route 3 and Church Street intersection in Franklin.

01082000 Contoocook River at 

Peterborough

Active USGS 68.1 Lat 42°51'45", long 71°57'35", Hillsborough County, on left bank, 750 ft upstream of Morrison 

Road bridge, 1,300 ft downstream of mill dam in Noone, and 0.6 mi southwest of US Route 202 and State Route 101 intersection in Peterborough.

01083000 Nubanusit Brook below 

MacDowell Dam near Peterborough

Active USGS 44 Lat 42°53'34", long 71°59'14", Hillsborough County, on left bank, 300 ft downstream of Edward 

MacDowell Dam, 600 ft upstream of abandoned mill dam, and 0.4 mi north of Wilder Street and Union Street in West Peterborough.

01084000 North Branch near Antrim Discontinued USGS 54.8 Lat 43°04'54", long 71°58'44", Hillsborough County, on right bank, 600 ft upstream of 

Old North Branch road bridge in North Branch, 3,800 ft upstream of State Route 9 bridge, and 2,400 ft northeast of the intersection of State Routes 9 and 31. 

01084500 Beards Brook near 

Hillsborough

Discontinued USGS 55.4 Lat 43°06'51", long 71°55'36", Hillsborough County, on right bank, 300 ft upstream of 

West Main Street bridge, 560 ft upstream of mouth on North Branch, and 1,800 ft west of US Route 202 and West Main Street intersection in Hillsborough.

18 Flood of May 2006 in New Hampshire
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01085000 Contoocook River near 

Henniker

Active USGS 368 Lat 43°09'07", long 71°51'28", Merrimack County, on right bank, 900 ft west of Western Avenue and Cote Hill Road intersection, 1.6 mi downstream of Sand Brook, and 1.7 mi upstream 

of Western Avenue bridge in Henniker.

01085500 Contoocook River below 

Hopkinton Dam at West Hopkinton

Active USGS 427 Lat 43°11'33", long 71°44'43", Merrimack County, on right bank 750 ft downstream of covered 

bridge at West Hopkinton, 2,200 ft downstream of Hopkinton Dam, and 1.2 mi north of the intersection of State Routes 127 and 9 in Hopkinton.

01085800 West Branch Warner River 

near Bradford

Discontinued USGS 5.75 Lat 43°15'33", long 72°01'35", Merrimack County, on left bank, 75 ft downstream of small 

right-bank tributary, 200 ft upstream of Fairground Road bridge, 750 ft east of Fairground Road and Newell Road intersection, and 3.8 mi west of Main Street and State Route 103 intersection in Bradford.

01086000 Warner River at Davisville Active USGS 146 Lat 43°15'03", long 71°43'58", Merrimack County, on left bank, 60 ft downstream of State 

Route 127 bridge at Davisville, and 0.9 mi east of Interstate Highway 89 and State Route 103 interchange in Warner.

01087000 Blackwater River near 

Webster

Active USGS 129 Lat 43°17'49", long 71°41'42", Merrimack County, on left bank, 1,200 ft west of Clothespin Bridge Road and Pleasant Street intersection at Dingit Corner, 2,300 ft downstream of 

Clothespin Bridge Road bridge, and 2.4 mi downstream of Blackwater Dam.

01087850 Contoocook River at River 

Hill, near Penacook

Active USACE 760 Lat 43°14'59", long 71°37'12", Merrimack County, at Horse Hill Road Bridge, 200 ft west of 

River Road, Horse Hill Road, and Bog Road intersection at River Hill, and 2.4 mi southwest of US Route 3 and Washington Street intersection in Penacook.

01088400 Merrimack River at Concord Active USACE 2,300 Lat 43°12'32", long 71°31'51", Merrimack County, at downstream side of Bridge Street (State 

Route 9) bridge over the Merrimack River, and 1,600 ft east of Bridge Street (State Route 9) and Main Street (US Route 3) intersection in Concord.

01089000 Soucook River near Concord Discontinued USGS 76.8 Lat 43°14'19", long 71°27'45", Merrimack County, on left bank, 500 ft upstream of State 

Route 9 bridge, 4,300 ft upstream of Cemetery Brook, and 0.4 mi northeast of the intersection of State Routes 106 and 9.

01089100 Soucook River at Pembroke 

Road, near Concord

Active USGS 81.9 Lat 43°12'49", long 71°28'51", Merrimack County, on left bank, 100 ft upstream of Pembroke 

Road bridge, 550 ft upstream of Frenchs Brook, and 770 ft east of State Route 106 and Pembroke Road intersection in Concord.

01089500 Suncook River at 

North Chichester

Discontinued USGS 157 Lat 43°15'24", long 71°22'12", Merrimack County, on left bank, 100 ft downstream of Depot 

Road, 800 ft east of Depot Road and State Route 28 intersection, and 2,000 ft upstream of Sanders Brook. 

01090800 Piscataquog River below 

Everett Dam, near East Weare

Active USGS 63.1 Lat 43°05'29", long 71°39'36", Hillsborough County, on right bank, 500 ft downstream of 

Everett Dam, 2,700 ft upstream of Clough Park Road bridge, and 1.7 mi north of Clough Park Road and River Road intersection in Weare.

01091000 South Branch Piscataquog 

River near Goffstown

Discontinued USGS 104 Lat 43°00'53", long 71°38'31", Hillsborough County, on right bank, 20 ft upstream of Breed 

Brook Road bridge, 50 ft northwest of Breed Brook Road and State Route 13 intersection, 2.3 mi west of the intersection of State Routes 13 and 114 and Mountain Road in Goffstown.

Table 1 19
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01091500 Piscataquog River near 

Goffstown

Active USGS 202 Lat 43°01'00", long 71°33'04", Hillsborough County, on left bank, 300 ft upstream of Henry 

Bridge Road bridge, 1,400 ft upstream of Harry Brook, and 0.6 mi northwest Henry Bridge Road and State Route 114 intersection in Goffstown.

01092000 Merrimack River near Goffs 

Falls, below Manchester

Active USGS 3,092 Lat 42°56'53", long 71°27'50", Hillsborough County, on right bank, 600 ft upstream of Interstate 

Highway 293 bridge, and 3,300 ft downstream of Bowman Brook in Manchester.

01093000 Sucker Brook at Auburn Discontinued USGS 27.8 Lat 43°00'21", long 71°20'57", Rockingham County, on left bank, 600 ft upstream of State 

Route 121, and 600 ft north of State Route 121 and Hooksett Road intersection in Auburn.

01094000 Souhegan River at 

Merrimack

Active USGS 171 Lat 42°51'27", long 71°30'24", Hillsborough County, on left bank, at head of Wildcat Falls, 

2,850 ft upstream of south bound bridge on Everett Turnpike, 0.9 mi southwest of Baboosic Lake Road and US Route 3 intersection in Merrimack.

010965844 Beaver Brook at South Road, 

near Derry

Active USGS 30.3 Lat 42°50'22", long 71°21'00", Rockingham County, on left bank, upstream side of South Road, 

at Kendall Pond outlet, 100 ft east of Kendall Pond Road and South Road intersection, 0.8 mi southeast of the intersection of State Routes 128 and 102 in Londonderry.

010965852 Beaver Brook at 

North Pelham

Active USGS 47.8 Lat 42°46'58", long 71°21'15", Hillsborough County, on right bank, 10 ft downstream of 

State Route 128 bridge at the Windham-Pelham town line, 0.7 mi north of State Route 128 and Castle Hill Road intersection in North Pelham, and 1.4 miles south of the intersection of State Routes 111 and 128.

01096587 Tributary to Cobbetts Pond at 

Interstate 93S Exit Ramp near Windham

Active USGS 0.54 Lat 42°48'24", long 71°16'27", Rockingham County, on right bank, upstream of Interstate 

Highway 93 South exit ramp, 675 ft upstream of mouth at Cobbetts Pond, 675 ft south of State Route 111 and Interstate Highway 93 South exit ramp intersection, and 1.7 mi east of Lowell Road and State Route 111 intersection at Windham.

01100505 Spicket River at North Salem Active USGS 16.5 Lat 42°50'57", long 71°12'56", Rockingham County, on right bank, 70 ft downstream of 

Haverhill Road bridge, 100 ft southeast of North Main Street, Haverhill Road, and Island Pond Road intersection in Cowbell Corners, and 1,200 ft south of Island Pond Road and State Route 111 intersection in Derry.

011005605 Policy Brook at Interstate 

93N Rest Stop Entrance Ramp, near Salem

Active USGS 10.2 Lat 42°45'13", long 71°13'15", Rockingham County, on left bank, upstream of Interstate 

Highway 93 northbound rest stop entrance ramp, and 2,100 ft southeast of the Cross Street bridge over Interstate Highway 93 in Salem.

01100561 Spicket River near 

Methuen, MA

Active USGS 62.1 Lat 42°44'35", long 71°12'32", Rockingham County, Hydrologic, on left bank, at upstream side 

Hampshire Road bridge at the New Hampshire-Massachusetts Border, 800 ft downstream from mouth of Policy Brook, and 0.5 mi west of State Route 28 and Lawrence Road intersection.

01137500 Ammonoosuc River at 

Bethlehem Junction

Active USGS 87.6 Lat 44°16'07", long 71°37'51", Grafton County, on left bank, 1,200 ft upstream of US Route 302 

bridge at Pierce Bridge, 1,300 ft south of US Route 302 and Muchmore Road intersection and, 3.0 mi east of US Route 302 and State Route 142 intersection in Bethlehem.

20 Flood of May 2006 in New Hampshire
Table 1.  Description of streamgages used to characterize the floods of May 2006 in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; mi2, square miles; lat, latitude; long, longitude; NHDES, New Hampshire Department of Environmental Services; ft, feet; USACE, U.S. Army Corps of Engineers]

USGS 

streamgage 

number

Streamgage name Status Operator

Drainage 

area

(mi2)

Streamgage location

01138500 Connecticut River at 

Wells River, VT

Active USGS 2,644 Lat 44°09'12", long 72°02'32", Orange County, on right bank, at village of Wells River, 200 ft 

downstream of US 302 bridge, 400 ft upstream of Wells River, 1,200 ft downstream of Ammonoosuc River, 0.2 mi west of US Route 302 and State Route 135 in Woodsville, NH.

01141800 Mink Brook near Etna Discontinued USGS 4.6 Lat 43°42'08", long 72°11'15", Grafton County, on left bank, 750 ft upstream of Ruddsboro 

Road bridge, 700 ft west of Three Mile Road and Ruddsboro Road intersection, 1.6 mi northeast of Etna Road and King Road intersection in Etna.

01144500 Connecticut River at 

West Lebanon

Active USGS 4,092 Lat 43°38'46", long 72°18'46", Grafton County, on left bank, 50 ft downstream of Boston & 

Maine Railroad bridge, 500 ft downstream of White River, 1,100 ft northwest of US Route 4 and State Route 12A intersection in West Lebanon.

01145000 Mascoma River at 

West Canaan

Active NHDESa 80.5 Lat 43°39'00", long 72°04'17", Grafton County, on right bank, 45 ft downstream of Boston 

and Maine Railroad bridge, 0.9 mi east of US Route 4 and South Road intersection in West Canaan.

01150500 Mascoma River at Mascoma Active NHDESa 153 Lat 43°38'56", long 72°10'57", Grafton County, on left bank, 100 ft upstream of Payne Road 

bridge, 100 ft downstream of Mascoma Lake dam, 0.2 mi south of US 4 and Payne Road intersection in Mascoma.

aStreamgage formerly operated by the U.S. Geological Survey.bStreamgage was active at time of flood, but discontinued September 30, 2006.

Table 1 21
Table 2.  Peak-stage data and peak-discharge data for the flooding in May 2006 at 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft, feet; NAVD 88, North American Vertical Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929; ft3/s, cubic feet per second; na, not available. Periods of record without an end date are active streamgages]

USGS 

streamgage 

number

Streamgage name

May 2006 flood

Period of 

record

Maximum previously 

recorded flood

Peak 

stage, local datum 

(ft)

Peak 

stage, 

NGVD 29 

(ft)

Peak 

stage, 

NAVD 88 

(ft)

Quality 

ranking of 

stage

Peak 

discharge 

(ft3/s)

Day Time

Peak 

discharge 

(ft3/s)

Date

01064500 Saco River near Conway 9.42 427.61 427.17 Excellent 13,900 May 14 12:45 pm 1904–10, 

1929–

47,200 3-27-1953

01064801 Bearcamp River at South Tamworth 7.73 501.10 500.64 Excellent 3,220 May 14 7:00 am 1993– 6,150 6-14-1998

01065000 Ossipee River at Effingham Falls 8.83a na na Excellent 4,780a May 17 4:00 pm 1942–90, 

1998–

11,700 3-28-1953

01072100 Salmon Falls River at Milton 7.30a 404.44 403.88 Excellent 5,450abc May 14 5:30 pm 1968– 4,000 4-6-198401072800 Cocheco River near Rochester 18.86 138.24 137.63 Excellent 5,550c May 14 7:15 pm 1995– 3,700 6-15-1998

01072850 Mohawk Brook near Center Strafford 6.18 na na Good 2,370bc May 14 na 1964–77 1,890 3-14-197701072870 Isinglass River at Rochester Neck 

Road, near Dover

19.37 na na Excellent 4,370 May 14 10:30 pm 2003– 1,780 4-4-2005

01072880 Cocheco River at Spaulding Turnpike, 

at Dover

14.36 na na Excellent 10,800b May 15 2:00 am 1992–96 4,590 4-17-1996

01073000 Oyster River near Durham 8.47 73.76 73.05 Excellent 873 May 14 6:30 pm 1934– 1,160 10-21-199601073460 North River above NH125, near Lee 12.26 na na Excellent 3,790 May 15 3:45 am 2004–06 861 4-4-2005

01073500 Lamprey River near Newmarket 18.31 56.59 55.86 Excellent 8,970c May 16 na 1934– 7,570 4-7-1987

01073587 Exeter River at Haigh Road, near 

Brentwood

12.00 72.27 71.52 Excellent 3,520c May 15 12:00 pm 1996– 3,060 10-22-1996

01073600 Dudley Brook near Exeter 9.24 95.29 94.54 Fair 660bc May 14 na 1962–85 358 4-2-1973

01073750 Mill Brook near NH108, at Stratham 10.81 na na Excellent 305b May 14 na 1973–79, 

2003–04

390 4-2-1973

01073785 Winnicut River at Greenland, near 

Portsmouth

6.30 14.56 13.81 Excellent 1,450 May 14 10:45 pm 2002– 708 4-2-2004

01073810 Berrys Brook at Sagamore Road, near 

Portsmouth

6.55 23.67 22.90 Excellent 505b May 14 na 2003–04 239 4-2-2004

01073822 Little River at Woodland Road, near 

Hampton

7.96 12.96 12.18 Excellent 774 May 14 6:45 pm 2003–06 320 4-2-2004

01073838 Taylor River at Old Stage Road near 

Hampton

8.76 20.84 20.06 Poor nad May 14 na 2004 na na

01073848 Hampton Falls River at Mill Lane, 

near Seabrook

11.04 na na Fair nad May 14 na 2003–04 248 4-2-2004

22 Flood of May 2006 in New Hampshire
Table 2.  Peak-stage data and peak-discharge data for the flooding in May 2006 at 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft, feet; NAVD 88, North American Vertical Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929; ft3/s, cubic feet per second; na, not available. Periods of record without an end date are active streamgages]

USGS 

streamgage 

number

Streamgage name

May 2006 flood

Period of 

record

Maximum previously 

recorded flood

Peak 

stage, local datum 

(ft)

Peak 

stage, 

NGVD 29 

(ft)

Peak 

stage, 

NAVD 88 

(ft)

Quality 

ranking of 

stage

Peak 

discharge 

(ft3/s)

Day Time

Peak 

discharge 

(ft3/s)

Date

01074520 East Branch Pemigewasset River at 

Lincoln

10.10 831.13 830.82 Excellent 4,960 May 14 6:30 am 1993– 16,900 4-14-2002

01075000 Pemigewasset River at Woodstock 8.56 625.00 624.66 Excellent 8,470 May 14 7:45 am 1939–77, 

2002–

47,000 10-24-1959

01075800 Stevens Brook near Wentworth 4.15 na na Good 481 May 14 na 1963–98 1,120 6-30-1973

01076000 Baker River near Rumney 9.33 506.67 506.27 Excellent 6,440 May 14 11:00 am 1929–77, 

2001–

21,400 6-15-1942

01076500 Pemigewasset River at Plymouth 14.44 471.51 471.10 Excellent 22,100 May 14 2:15 pm 1904– 65,400 3-19-1936

01077000 Squam River at Ashland 11.73 na na Excellent 425 May 19 12:30 pm 1940– 1,090 7-4-197301077510 Newfound River below Newfound 

Lake near Bristol

10.54a na na Excellent 3,500ac May 16 8:00 am 1994– 2,730 12-20-2003

01078000 Smith River near Bristol 11.41 461.21 460.83 Excellent 4,590 May 14 10:00 pm 1918– 8,100 3-19-1936

01079602 Poorfarm Brook near Gilford 6.67/

5.40e

514.33/513.06e

513.89/512.62e

Good/poore 1,050 May 14 na 1998–2004 730 6-14-1998

01079900 Shannon Brook near Moultonborough 8.33 na na Excellent 565b May 14 na 1999–2004 333 9-17-1999

01080000 Lake Winnipesaukee at Weirs Beach 5.50a 505.50 505.07 Excellent na May 22 11:45 am 1934– 505.86 ft 6-4-1984

01080500 Lake Winnipesaukee Outlet at 

Lakeport 

4.61a 505.16 504.72 Excellent 2,503a May 31 5:45 am 1933–83, 

1988–

2,890f 3-31-1936

01081000 Winnipesaukee River at Tilton 6.96 448.83 448.36 Excellent 2,980 May 20 3:45 pm 1937– 4,580 3-31-1984

01081500 Merrimack River at Franklin Junction 15.16 266.24 265.74 Excellent 20,800 May 14 1:30 pm 1905–78, 

1983–

83,000 3-19-1936

01082000 Contoocook River at Peterborough 4.62 736.59 735.87 Excellent 1,470 May 14 10:15 pm 1946– 3210 4-2-2004

01083000 Nubanusit Brook below MacDowell 

Dam near Peterborough

5.79 905.14 904.47 Excellent 663 May 25 11:15 am 1921–31, 

1946–

1,130 4-11-1931

01084000 North Branch near Antrim 4.65 886.03 885.46 Good nag May 14 4.65 1924–70 5,000 3-19-193601084500 Beards Brook near Hillsborough 7.84 601.48 600.87 Fair 3,000b May 14 na 1946–76, 

2006

4,800bh 10-9-2005

01085000 Contoocook River near Henniker 13.48 483.80 483.18 Excellent 10,400 May 15 10:00 am 1938, 

1940–77, 1989–

22,200 9-21-1938

Table 2 23
Table 2.  Peak-stage data and peak-discharge data for the flooding in May 2006 at 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft, feet; NAVD 88, North American Vertical Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929; ft3/s, cubic feet per second; na, not available. Periods of 

record without an end date are active streamgages]

USGS 

streamgage 

number

Streamgage name

May 2006 flood

Period of 

record

Maximum previously 

recorded flood

Peak 

stage, local datum 

(ft)

Peak 

stage, 

NGVD 29 

(ft)

Peak 

stage, 

NAVD 88 

(ft)

Quality 

ranking of 

stage

Peak 

discharge 

(ft3/s)

Day Time

Peak 

discharge 

(ft3/s)

Date

01085500 Contoocook River below Hopkinton 

Dam at West Hopkinton

8.61 364.44 363.76 Excellent 5,460 May 25 6:30 pm 1964– 7,530 4-8-1987

01085800 West Branch Warner River near 

Bradford

9.52 na na Good 1,010bc May 14 na 1963–2004 881 8-12-2003

01086000 Warner River at Davisville 12.35i 392.31 391.72 Excellent 8,640c May 15 5:15 am 1940–78, 

1999– 

4,510 3-27-1953

01087000 Blackwater River near Webster 7.00 438.73 438.17 Excellent 2,220 May 31 10:45 am 1919–20, 

1927–

11,000j 3-19-1936

01087850 Contoocook River at River Hill, 

near Penacook

17.15 349.12 348.52 Excellent 10,300 May 15 10:00 am na na na

01088400 Merrimack River at Concord 15.12 232.29 231.68 Excellent 35,420 May 15 1:00 pm na na na01089000 Soucook River near Concord na 306.65 306.07 Excellent 4,790ck May 14 na 1952–87 3,700 3-14-1977

01089100 Soucook River at Pembroke Road, 

near Concord

14.92 270.81 270.21 Excellent 5,110bc May 14 8:45 pm 1989– 2,320 4-17-1996

01089500 Suncook River at North Chichester 13.55 342.90 342.33 Good 7,600 May 15 na 1919–20, 

1922–27, 1929–70

12,900 3-19-1936

01090800 Piscataquog River below Everett Dam, 

near East Weare

8.63 328.29 327.63 Excellent 1,540 May 31 6:00 pm 1963– 1,770 6-12-1984

01091000 South Branch Piscataquog River 

near Goffstown

na 320.91 320.24 Good 7,180cl May 14 na 1941–78 4,100 6-25-1944

01091500 Piscataquog River near Goffstown 12.55 187.20 186.53 Excellent 10,100 May 14 8:45 pm 1936, 1938, 

1940–78, 1983–

21,900 9-21-1938

01092000 Merrimack River near Goffs Falls, 

below Manchester

19.86 129.13 128.44 Excellent 74,700 May 15 7:30 am 1936– 150,000j 3-20-1936

01093000 Sucker Brook at Auburn 4.36 257.08 256.38 Good nad May 14 na 1938–70 602m 9-12-195401094000 Souhegan River at Merrimack 9.87 170.45 169.75 Excellent 6,140 May 15 10:00 am 1910–76, 

1980, 1982–

16,900 3-19-1936

010965844 Beaver Brook at South Road, 

near Derry

6.90 220.66 219.97 Excellent 2,230 May 15 2:00 am 2006– na na

24 Flood of May 2006 in New Hampshire
Table 2.  Peak-stage data and peak-discharge data for the flooding in May 2006 at 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft, feet; NAVD 88, North American Vertical Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929; ft3/s, cubic feet per second; na, not available. Periods of record without an end date are active streamgages]

USGS 

streamgage 

number

Streamgage name

May 2006 flood

Period of 

record

Maximum previously 

recorded flood

Peak 

stage, local datum 

(ft)

Peak 

stage, 

NGVD 29 

(ft)

Peak 

stage, 

NAVD 88 

(ft)

Quality 

ranking of 

stage

Peak 

discharge 

(ft3/s)

Day Time

Peak 

discharge 

(ft3/s)

Date

010965852 Beaver Brook at North Pelham 14.90 164.16 163.45 Excellent 2,940c May 15 3:15 am 1987– 1,850 4-6-198701096587 Tributary to Cobbetts Pond at Interstate 93S Exit Ramp near Windham 4.10 na na Excellent 72 May 14 11:30 am 2006- na na

01100505 Spicket River at North Salem 7.06 na na Excellent 801 May 15 11:00 am 2001– 240 5-26-2005011005605 Policy Brook at Interstate 93N Rest 

Stop Entrance Ramp, near Salem

9.65 115.35 114.59 Excellent 515 May 15 5:00 am 2006– na na

01100561 Spicket River near Methuen, MA 12.15 113.05 112.28 Excellent >2,260n May 16 4:30 am 2001– 1,140 3-24-2001

01137500 Ammonoosuc River at Bethlehem 

Junction

6.00 1186.74 1186.48 Excellent 2,260 May 14 8:30 am 1940– 11,300 11-12-1995

01138500 Connecticut River at Wells River, VT 8.03 407.78 407.40 Excellent 22,400 May 20 10:00 am 1950– 57,100 7-1-1973

01141800 Mink Brook near Etna 4.36 na na Good 870bc May 14 na 1963–88 629 8-1-198601144500 Connecticut River at West Lebanon 17.34 338.86 338.45 Excellent 42,800 May 20 8:45 am 1912–76, 

1979–

136,000 11-4-1927

01145000 Mascoma River at West Canaan 7.87 837.72 837.43 Excellent 2,850a May 14 10:15 am 1938–78, 

1985–

4,310 9-22-1938

01150500 Mascoma River at Mascoma 9.65 750.33 750.03 Excellent 4,350a May 15 12:30 pm 1924– 5,090 3-19-1936

aData provided by New Hampshire Department of Environmental Services.bDischarge estimated by graphically extending stage-discharge relation.cDischarge is maximum for the period of record, which is greater than 10 years.dBackwater from downstream conditions invalidated the stage-discharge relation.ePeak stages determined at upstream and downstream control locations, as control for the streamgage was moved during period of record. The lower elevations are at a point approximately 100 ft downstream of the streamgage house.fMaximum daily mean discharge.gPeak stage/high-water mark too far downstream to be used for estimating discharge from the stage-discharge relation.hPreviously unpublished discharge estimate from flagged high-water marks following the October 8 and 9, 2005, flood.iStage of September 1938 flood was 12.80 ft.jPrior to construction of flood-control structures.kDischarge estimated by adjusting the peak discharge determined at the downstream streamgage, 01089100, by the ratio of the drainage areas.lMeasurement of peak discharge at width contraction by indirect methods (Matthai, 1967).

mMaximum stage on September 12, 1954, was 2.55 ft.

nPeak discharge was not available at the time of this writing. On May 15, 2006, at 4:30 pm, a discharge measurement was made at a stage of 11.91 ft, local datum. The measured discharge was 2,260 ft3/s.

Table 2 25
Table 3.  Flow-frequency data and recurrence interval estimates of the May 2006 flood for 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft3/s, cubic feet per second; yr, year; <, less than; >, greater than; na, not available. Frequency curve determination method: LeBlanc, frequency curve estimated with regression equation (LeBlanc, 1978; LP3, log-Pearson type-3 frequency analysis; FIS, flow-frequency curve from Federal Emergency Management Agency flood-insurance study; Ratio, frequency curve based on a downstream streamgage with frequency curve adjusted by the ratio of drainage area of the streamgages]

USGS 

streamgage 

number

Streamgage name

Peak 

discharge 

of May 2006 

flood 

(ft3/s)

Estimated discharges for selected recurrence intervals 

(ft3/s)

Frequency 

curve 

determination 

method

Recurrence 

interval of 

May 2006 

flood 

(yr)

2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 500-yr

01064500 Saco River near Conway 13,900 16,700 26,000 32,600 41,400 48,300 55,500 73,100 LP3 <2

01064801 Bearcamp River at South Tamworth 3,220 3,330 5,070 6,260 7,810 8,980 10,200 13,000 LP3 <2

01065000 Ossipee River at Effingham Falls 4,780 3,480 4,840 5,850 7,260 8,400 9,640 11,000 LP3 2–501072100 Salmon Falls River at Milton 5,450 1,410 2,230 2,880 3,830 4,640 5,550 6,550 LP3 50–100

01072800 Cocheco River near Rochester 5,550 1,760 3,070 4,210 5,990 7,600 9,480 11,700 LP3 10–2501072850 Mohawk Brook near Center Strafford 2,370 289 683 1,110 1,920 2,770 3,900 8,040 LP3 25–50

01072870 Isinglass River at Rochester Neck 

Road, near Dover

4,380 1,560 2,380 2,920 3,940 4,680 5,620 8,230 LeBlanc 25–50

01072880 Cocheco River at Spaulding Turnpike, 

at Dover

10,800 3,350 4,950 6,040 7,900 9,300 11,100 15,800 LeBlanc 50–100

01073000 Oyster River near Durham 873 302 471 597 772 913 1,060 1,460 LP3 25–50

01073460 North River above NH125, near Lee 3,790 795 1,230 1,520 2,100 2,500 3,020 4,520 LeBlanc 100–500

01073500 Lamprey River near Newmarket 8,970 2,170 3,440 4,450 5,920 7,170 8,560 12,400 LP3 100–50001073587 Exeter River at Haigh Road, near 

Brentwood

3,450 831 1,150 1,380 1,730 2,000 2,340 3,200 LeBlanc >500

01073600 Dudley Brook near Exeter 660 167 256 326 426 511 604 859 LP3 100–50001073750 Mill Brook near NH108, at Stratham 305 52.2 83.4 104 152 183 223 352 LeBlanc 100–500

01073785 Winnicut River at Greenland, near 

Portsmouth

1,450 227 334 406 542 637 758 1,100 LeBlanc >500

01073810 Berrys Brook at Sagamore Road, near 

Portsmouth

505 77.4 112 136 182 213 253 368 LeBlanc >500

01073822 Little River at Woodland Road, near 

Hampton

774 109 164 202 278 329 395 590 LeBlanc >500

01073838 Taylor River at Old Stage Road near 

Hampton

na 102 143 172 222 257 302 424 LeBlanc na

01073848 Hampton Falls River at Mill Lane, near 

Seabrook

na 63 95.5 117 163 193 232 349 LeBlanc na

26 Flood of May 2006 in New Hampshire
Table 3.  Flow-frequency data and recurrence interval estimates of the May 2006 flood for 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft3/s, cubic feet per second; yr, year; <, less than; >, greater than; na, not available. Frequency curve determination method: LeBlanc, frequency curve estimated with regression equation (LeBlanc, 1978; LP3, log-Pearson type-3 frequency analysis; FIS, flow-frequency curve from Federal Emergency Management Agency flood-insurance study; Ratio, frequency curve based on a downstream streamgage with frequency curve adjusted by the ratio of drainage area of the streamgages]

USGS 

streamgage 

number

Streamgage name

Peak 

discharge 

of May 2006 

flood 

(ft3/s)

Estimated discharges for selected recurrence intervals 

(ft3/s)

Frequency 

curve 

determination 

method

Recurrence 

interval of 

May 2006 

flood 

(yr)

2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 500-yr

01074520 East Branch Pemigewasset River at 

Lincoln

4,960 11,300 14,500 16,500 19,000 20,800 22,600 26,800 LP3 <2

01075000 Pemigewasset River at Woodstock 8,470 11,700 19,100 24,800 32,800 39,400 46,600 65,600 LP3 <2

01075800 Stevens Brook near Wentworth 481 203 393 573 878 1,170 1,540 2,740 LP3 5–1001076000 Baker River near Rumney 6,440 5,170 8,730 11,800 16,600 20,800 25,900 41,000 LP3 2–5

01076500 Pemigewasset River at Plymouth 22,100 21,200 30,100 36,500 45,000 51,600 58,600 76,300 LP3 2–5

01077000 Squam River at Ashland 425 240 438 608 872 1,110 1,370 2,160 LP3 2–501077510 Newfound River below Newfound 

Lake near Bristol

3,500 1,560 2,320 2,780 3,300 3,660 3,990 4,680 LP3 25–50

01078000 Smith River near Bristol 4,590 1,740 2,570 3,200 4,100 4,840 5,650 7,840 LP3 25–50

01079602 Poorfarm Brook near Gilford 1,050 220 374 472 722 882 1,090 1,780 LeBlanc 100–50001079900 Shannon Brook near Moultonborough 565 325 592 770 1240 1,560 1,970 3,420 LeBlanc 5–10

01080000 Lake Winnipesaukee at Weirs Beach na na na 505.4 ft na 505.9 ft 506.2 ft 506.7 ft FIS 10–2501080500 Lake Winnipesaukee Outlet at 

Lakeport 

2,503 1,570 2,060 2,360 2,700 2,940 3,160 3,640 LP3 10–25

01081000 Winnipesaukee River at Tilton 2,980 2,220 2,930 3,330 3,790 4,100 4,380 4,970 LP3 5–10

01081500 Merrimack River at Franklin Junction 20,800 na na 14,800 na 25,000 30,000 62,000 FISa 10–5001082000 Contoocook River at Peterborough 1,470 1,290 1,830 2,210 2,710 3,100 3,490 4,480 LP3 2–5

01083000 Nubanusit Brook below MacDowell 

Dam near Peterborough

663 na na 650 na 700 800 900 FISa 10–50

01084000 North Branch near Antrim na 890 1,440 1,930 2,720 3,450 4,330 7,120 LP3 na

01084500 Beards Brook near Hillsborough 3,000 1,200 1,700 2,070 2,570 2,970 3,400 4,500 LP3 50–100

01085000 Contoocook River near Henniker 10,400 na na 9,100 na 17,000 21,600 34,000 FISa 10–5001085500 Contoocook River below Hopkinton 

Dam at West Hopkinton

5,460 na na 7,200 na 7,300 9,500 13,000 FISa <10

01085800 West Branch Warner River near 

Bradford

1,010 345 558 712 915 1,070 1,240 1,630 LP3 25–50

Table 3 27
Table 3.  Flow-frequency data and recurrence interval estimates of the May 2006 flood for 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft3/s, cubic feet per second; yr, year; <, less than; >, greater than; na, not available. Frequency curve determination method: LeBlanc, frequency curve estimated with regression equation (LeBlanc, 1978; LP3, log-Pearson type-3 frequency analysis; FIS, flow-frequency curve from Federal Emergency Management Agency flood-insurance study; Ratio, frequency curve based on a downstream streamgage with frequency curve adjusted by the ratio of drainage area of the streamgages]

USGS 

streamgage 

number

Streamgage name

Peak 

discharge 

of May 2006 

flood 

(ft3/s)

Estimated discharges for selected recurrence intervals 

(ft3/s)

Frequency 

curve 

determination 

method

Recurrence 

interval of 

May 2006 

flood 

(yr)

2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 500-yr

01086000 Warner River at Davisville 8,640 2,150 3,110 3,820 4,820 5,630 6,500 8,810 LP3 100–500

01087000 Blackwater River near Webster 2,220 1,740 2,080 2,250 2,420 2,530 2,620 2,790 LP3 5–10

01087850 Contoocook River at River Hill, near 

Penacook

10,300 na na 8,000 na 15,000 23,300 33,000 FISa 10–50

01088400 Merrimack River at Concord 35,420 na na 19,300 na 33,750 44,000 86,250 FISa 50–100

01089000 Soucook River near Concord 4,790 1,260 1,940 2,470 3,220 3,840 4,500 6,300 Ratio 100–50001089100 Soucook River at Pembroke Road, near 

Concord

5,110 1,340 2,070 2,630 3,430 4,090 4,800 6,720 LP3 100–500

01089500 Suncook River at North Chichester 7,600 2,220 3,480 4,510 6,060 7,420 8,970 13,400 LP3 50–100

01090800 Piscataquog River below Everett Dam, 

near East Weare

1,540 987 1,320 1,520 1,760 1,930 2,090 2,440 LP3 5–10

01091000 South Branch Piscataquog River near 

Goffstown

7,180 2,070 3,100 3,810 4,720 5,410 6,110 7,770 LP3 100–500

01091500 Piscataquog River near Goffstown 10,100 na na 5,300 na 9,700 12,500 21,000 FISa 50–100

01092000 Merrimack River near Goffs Falls, 

below Manchester

74,700 na na 44,000 na 56,000 69,000 127,000 FISa 100–500

01093000 Sucker Brook at Auburn na 256 379 459 556 626 693 843 LP3 na

01094000 Souhegan River at Merrimack 6,140 3,140 4,830 6,190 8,210 9,960 11,900 17,600 LP3 5–10010965844 Beaver Brook at South Road, near 

Derry

2,230 482 835 1,150 1,630 2,080 2,610 4,250 Ratio 50–100

010965852 Beaver Brook at North Pelham 2,890 761 1,320 1,810 2,600 3,320 4,170 6,790 LP3 25–50

01096587 Tributary to Cobbetts Pond at Interstate 

93S Exit Ramp near Windham

72 20.8 37.5 48.3 79.3 98.7 124 218 LeBlancb 10–25

01100505 Spicket River at North Salem 799 338 519 639 884 1,050 1,270 1,900 LeBlancb 10–25

011005605 Policy Brook at Interstate 93N Rest 

Stop Entrance Ramp, near Salem

515 204 314 387 538 640 772 1,160 LeBlancb 10–25

01100561 Spicket River near Methuen, MA na 854 1,200 1,440 1,820 2,110 2,470 3,410 LeBlancb na

28 Flood of May 2006 in New Hampshire
Table 3.  Flow-frequency data and recurrence interval estimates of the May 2006 flood for 65 streamgages in central and southern New Hampshire.—Continued

[USGS, U.S. Geological Survey; ft3/s, cubic feet per second; yr, year; <, less than; >, greater than; na, not available. Frequency curve determination method: LeBlanc, frequency curve estimated with regression equation (LeBlanc, 1978; LP3, log-Pearson type-3 frequency analysis; FIS, flow-frequency curve from Federal Emergency Management Agency flood-insurance study; Ratio, frequency curve based on a downstream streamgage with frequency curve adjusted by the ratio of drainage area of the streamgages]

USGS 

streamgage 

number

Streamgage name

Peak 

discharge 

of May 2006 

flood 

(ft3/s)

Estimated discharges for selected recurrence intervals 

(ft3/s)

Frequency 

curve 

determination 

method

Recurrence 

interval of 

May 2006 

flood 

(yr)

2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 500-yr

01137500 Ammonoosuc River at Bethlehem 

Junction

2,260 4,390 6,360 7,790 9,720 11,300 12,900 17,100 LP3 <2

01138500 Connecticut River at Wells River, VT 22,400 32,700 41,200 46,100 51,600 55,400 58,800 66,000 LP3 <2

01141800 Mink Brook near Etna 870 215 366 486 662 810 973 1,420 LP3 50–10001144500 Connecticut River at West Lebanon 42,800 47,300 63,200 74,400 89,400 101,000 114,000 145,000 LP3 <2

01145000 Mascoma River at West Canaan 2,850 1,640 2,340 2,800 3,380 3,820 4,250 5,260 LP3 10–25

01150500 Mascoma River at Mascoma 4,350 1,950 2,890 3,570 4,470 5,180 5,930 7,790 LP3 10–25

aComputed by the U.S. Army Corps of Engineers for the flood-insurance study.bResults from the Leblanc (1978) regression equations may be unreliable in basin with urbanization or regulation.

Table 3 29
Table 4.  Relation of computed May 2006 flood discharge and stage data to flood-insurance study data for selected streamgages in central and southern New Hampshire.

—Continued[USGS, U.S. Geological Survey; na, not available; ft3/s, cubic feet per second; yr, year; NAVD 88, North American Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929]

USGS 

streamgage 

number

Streamgage name

Peak discharge of 

May 2006 

flood 

(ft3/s)

Magnitude of discharge for X-yr recurrence 

interval at streamgage location from 

flood-insurance study 

(ft3/s)

Peak stage 

of May 2006 

flood, 

NGVD 29 

(ft)

Water-surface elevation for X-yr recurrence 

interval at streamgage location from 

flood-insurance study, NGVD 29 

(ft)

Value to 

subtract from 

NGVD 29 

elevation to 

obtain 

NAVD 88 

(ft)

10-yr 50-yr 100-yr 500-yr 10-yr 50-yr 100-yr 500-yr

01064500 Saco River near Conway 13,900 29,750 45,840 53,640 72,180 427.61 431.9 435.4 437.1 440.5 0.4401064801 Bearcamp River at 

South Tamworth

3,220 na na 14,900 na 501.10 na na 510 na 0.46

01072100 Salmon Falls River at Milton 5,450 2,930 4,500 5,290 7,490 404.44 408.1 409.2 409.8 411.0 0.5601072800 Cocheco River near 

Rochester

5,550 3,160 5,100 6,120 9,580 138.24 135.0 136.6 137.5 139.8 0.61

01073500 Lamprey River near 

Newmarket

8,970 4,120 6,270 7,300 10,000 56.59 48.1 52.0 53.5 58.0 0.73

01073587 Exeter River at Haigh Road, 

near Brentwood

3,450 1,810 2,640 3,010 3,900 72.20 69.0 70.1 70.4 71.2 0.75

01073600 Dudley Brook near Exeter 660 na na 506 na 95.29 na na 94.1 na 0.75

01073822 Little River at Woodland 

Road, near Hampton

774 118 189 226 330 12.96 9.0 9.4 10.0 11.7 0.78

01074520 East Branch Pemigewasset 

River at Lincoln

4,960 13,000 24,000 30,300 50,000 831.13 834.0 836.5 838.0 842.0 0.31

01075000 Pemigewasset River at 

Woodstock

8,470 na na 47,700 na 625.00 na na 632.0 na 0.34

01076000 Baker River near Rumney 6,440 8,200 12,800 14,400 19,000 506.67 506.4 509.1 509.7 511.4 0.4001076500 Pemigewasset River at 

Plymouth

22,100 35,000 53,500 62,000 82,700 471.51 482.0 482.5 483.4 494.0 0.41

01080000 Lake Winnipesaukee at 

Weirs Beach

na na na na na 505.50 505.4 505.9 506.2 506.7 0.43

01080500 Lake Winnipesaukee Outlet 

at Lakeport 

2,503 2,600 2,600 3,500 4,300 505.16 504.0 504.3 504.3 504.3 0.44

01081000 Winnipesaukee River at 

Tilton

2,980 3,465 4,965 5,715 7,670 448.83 449.8 451.4 452.2 454.1 0.47

01081500 Merrimack River at 

Franklin Junction

20,800 14,800 25,000 30,000 62,000 266.24 263.1 268.4 270.4 281.1 0.50

30 Flood of May 2006 in New Hampshire
Table 4.  Relation of computed May 2006 flood discharge and stage data to flood-insurance study data for selected streamgages in central and southern New Hampshire.

—Continued[USGS, U.S. Geological Survey; na, not available; ft3/s, cubic feet per second; yr, year; NAVD 88, North American Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929]

USGS 

streamgage 

number

Streamgage name

Peak discharge of 

May 2006 

flood 

(ft3/s)

Magnitude of discharge for X-yr recurrence 

interval at streamgage location from 

flood-insurance study 

(ft3/s)

Peak stage 

of May 2006 

flood, 

NGVD 29 

(ft)

Water-surface elevation for X-yr recurrence 

interval at streamgage location from 

flood-insurance study, NGVD 29 

(ft)

Value to 

subtract from 

NGVD 29 

elevation to 

obtain 

NAVD 88 

(ft)

10-yr 50-yr 100-yr 500-yr 10-yr 50-yr 100-yr 500-yr

01082000 Contoocook River at 

Peterborough

1,470 2,300 4,310 5,700 9,890 736.59 736.7 739.4 740.5 742.6 0.72

01083000 Nubanusit Brook below 

MacDowell Dam near Peterborough

663 650 700 800 900 905.14 na na na na 0.67

01084000 North Branch near Antrim na 2,500 4,780 5,600 8,400 886.03 885.2 887.2 888.0 891.0 0.5701084500 Beards Brook near 

Hillsborough

3,000 2,300 3,900 4,800 7,100 601.48 598.4 601.8 603.7 610.0 0.61

01085000 Contoocook River near 

Henniker

10,400 9,100 17,000 21,600 34,000 483.77 484.4 489.2 491.6 496.0 0.62

01085500 Contoocook River below 

Hopkinton Dam at West Hopkinton

5,460 7,200 7,300 9,500 13,000 364.44 365.7 365.8 367.5 370.0 0.68

01086000 Warner River at Davisville 8,640 4,600 7,800 9,500 14,550 392.31 386.0 388.0 389.0 391.5 0.59

01087000 Blackwater River near 

Webster

2,220 na na 2,600 na na na na 440.0 na 0.56

01087850 Contoocook River at River 

Hill, near Penacook

10,300 8,000 15,000 23,300 33,000 349.12 348.2 352.3 356.1 359.5 0.60

01088400 Merrimack River at Concord 35,420 19,300 33,750 44,000 86,250 232.29 226.4 230.1 232.4 238.8 0.6101089000 Soucook River near Concord 4,790 2,410 4,100 5,045 7,605 306.65 301.4 304.0 305.2 307.0 0.58

01089100 Soucook River at Pembroke 

Road, near Concord

5,110 2,620 4,450 5,475 8,255 270.81 268.0 271.2 272.0 274.0 0.60

01089500 Suncook River at 

North Chichester

7,600 4,775 8,335 10,330 15,970 342.90 341.3 344.0 345.2 347.9 0.57

01090800 Piscataquog River below 

Everett Dam, near East Weare

1,540 na na 2,200 na 328.29 na na 329.6 na 0.66

01091000 South Branch Piscataquog 

River near Goffstown

7,180 3,690 5,910 6,990 10,220 320.91 317.8 320.0 321.0 323.8 0.67

Table 4 31
Table 4.  Relation of computed May 2006 flood discharge and stage data to flood-insurance study data for selected streamgages in central and southern New Hampshire.

—Continued[USGS, U.S. Geological Survey; na, not available; ft3/s, cubic feet per second; yr, year; NAVD 88, North American Datum of 1988; NGVD 29, National Geodetic Vertical Datum of 1929]

USGS 

streamgage 

number

Streamgage name

Peak discharge of 

May 2006 

flood 

(ft3/s)

Magnitude of discharge for X-yr recurrence 

interval at streamgage location from 

flood-insurance study 

(ft3/s)

Peak stage 

of May 2006 

flood, 

NGVD 29 

(ft)

Water-surface elevation for X-yr recurrence 

interval at streamgage location from 

flood-insurance study, NGVD 29 

(ft)

Value to 

subtract from 

NGVD 29 

elevation to 

obtain 

NAVD 88 

(ft)

10-yr 50-yr 100-yr 500-yr 10-yr 50-yr 100-yr 500-yr

01091500 Piscataquog River near 

Goffstown

10,100 5,300 9,700 12,500 21,000 187.20 182.9 185.8 186.9 189.4 0.67

01092000 Merrimack River near Goffs 

Falls, below Manchester

74,700 44,000 56,000 69,000 127,000 129.13 122.1 126.0 128.0 140.0 0.69

01094000 Souhegan River at 

Merrimack

6,140 6,920 11,900 12,500 22,000 170.45 171.1 174.2 174.7 179.0 0.70

010965844 Beaver Brook at South Road, 

near Derry

2,230 860 1,760 2,160 3,600 220.66 217.5 218.8 219.2 220.4 0.69

010965852 Beaver Brook at 

North Pelham

2,890 1,450 2,470 3,070 4,750 164.16 161.3 162.9 163.5 165.3 0.71

01100561 Spicket River near 

Methuen, MA

na 900 1,600 1,900 2,900 113.05 109.0 111.3 111.6 114.3 0.77

01138500 Connecticut River at 

Wells River, VT

22,400 na na 80,300 na 407.78 na na 420.0 na 0.38

01144500 Connecticut River at 

West Lebanon

42,800 72,000 108,000 125,000 157,000 338.86 345.4 351.0 353.9 358.0 0.41

01145000 Mascoma River at 

West Canaan

2,850 3,100 4,815 5,665 7,970 837.72 837.5 839.2 840.0 841.8 0.29

01150500 Mascoma River at 

Mascoma

4,350 3,500 5,750 7,000 10,000 750.33 748.8 750.8 752.8 754.0 0.30

32 Flood of May 2006 in New Hampshire
Prepared by Publications Service Center 1

For more information concerning the research in this report, contact:

Keith W. Robinson, Director

U.S. Geological Survey

New Hampshire-Vermont Water Science Center

361 Commerce Way

Pembroke, NH 03275

or visit our Web site at:

http://nh.water.usgs.gov
Olson, S.A.—Flood of May 2006 in New Hampshire—Open-File Report 2007–1122

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