U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Report 2006–5112

Magnitude and Frequency of Floods in New York

Prepared in coooperation with the New York State Department of Transportation
Cover.  Shows washout on Chase Brook Road, across Chase Brook near Cannonsville Reservoir in Delaware County, New York, 

January 19, 1996. (Photography courtesy of The Walton Reporter, January 24, 1996, page. 6)
Magnitude and Frequency of Floods in 

New York

By Richard Lumia, Douglas A. Freehafer, and Martyn J. Smith

Prepared in cooperation with the New York State Department of Transportation

Scientific Investigations Report 2006–5112

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: 2006

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Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Lumia, Richard, Freehafer, D.A., and Smith, M.J., 2006, Magnitude and frequency of floods in New York: 

U.S. Geological Survey Scientific Investigations Report 2006–5112, 152 p.
iii

Preface

This report includes a Geographic Information System (GIS) tool to compute basin characteristics 

used in the regional regression equations included with the report. It is the responsibility of the 

user to use the tool properly and to verify that the results are meaningful. The user is cautioned 

that although the tool has been tested, future uses might reveal errors that were not detected 

during testing. Users are encouraged to notify the U.S. Geological Survey New York Water 

Science Center of any errors found in the GIS tool by using the email address askny@usgs.gov. 

Updates might occasionally be made to the GIS tool. Users can check for updates on the Internet 

at URL http://ny.water.usgs.gov/projects/floodfreq/.
iv

This page has been left blank intentionally. 
v

Contents

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

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

Purpose and Scope ..............................................................................................................................2

Description of Study Area ...................................................................................................................2

Physiography................................................................................................................................2

Geology..........................................................................................................................................2

Climate...........................................................................................................................................2

Magnitude and Frequency of Flood Discharges ......................................................................................4

Database ................................................................................................................................................4

Annual Peak-Discharge Records..............................................................................................4

Magnitude and Frequency of Flood Discharges at Streamflow-Gaging Stations ............9

Basin Characteristics................................................................................................................12

Regression Analysis...........................................................................................................................17

Regionalization of Flood-Frequency Estimates..............................................................................22

Delineation of Hydrologic Regions .........................................................................................22

Regional Basin and Peak-Discharge Characteristics .........................................................23

Regional Regression Equations........................................................................................................27

Full-Regression Equations........................................................................................................27

Drainage-Area-Only Equations ...............................................................................................27

Computation of Peak Discharge.......................................................................................................35

Gaged Sites.................................................................................................................................35

Ungaged Sites ............................................................................................................................35

Sample Computations ...............................................................................................................36

Limitations, Accuracy, and Sensitivity of Regression Equations.........................................................41

Suggestions for Further Study...................................................................................................................45

Skewness Coefficient ........................................................................................................................45

Soil Maps..............................................................................................................................................45

Small-Stream Data..............................................................................................................................46

Other Factors.......................................................................................................................................46

Summary........................................................................................................................................................46

Acknowledgments.......................................................................................................................................46

Selected References...................................................................................................................................46

Appendix 1...................................................................................................................................................150

New York Flood-Frequency Tool.....................................................................................................150

System Requirements ......................................................................................................................150

Data Requirements...........................................................................................................................150

Installation of the New York Flood-Frequency Tool ....................................................................150

Using the New York Flood-Frequency Tool...................................................................................151

Limitations..........................................................................................................................................151

Using the New York Flood-Frequency Spreadsheet...................................................................151

Future Updates..................................................................................................................................151 
vi

DVD

[in pocket] 

Figures

1–2 Maps showing:

1. Physiographic provinces of New York, excluding Long Island....................................3

2. Six hydrologic regions of New York and locations of 388 streamflow-gaging

stations represented in this study.....................................................................................5

3–6 Graphs showing:

3. Annual peak discharges and 100-year peak discharges for 388 rural, 

unregulated streamflow-gaging stations used in this study ........................................9

4. Annual peak discharges and trend line for streams in two highly developed 

areas (A,B) and in an undeveloped area (C) in New York: (A) 01311000 – 

Pines Brook at Malverne, (B) 01302000 – Bronx River at Bronxville, and 

(C) 01512500 – Chenango River near Chenango Forks ................................................10

5. Annual peak discharges and trend lines for (A) all study sites and (B) all 

small stream (10- to 50-square miles) study sites ........................................................11

6. Examples of flood-frequency curves for selected streamflow-gaging stations

along the Hudson River in New York ..............................................................................12

7. Locations of 122 streamflow-gaging stations on regulated and urbanized streams in

New York ......................................................................................................................................13

8–9 Graphs showing:

8. Annual peak discharges and moving 100- and 2-year flood discharges for two

streamflow-gaging stations in New York: (A) 01512500 – Chenango River near

Chenango Forks, and (B) 04256000 – Independence River at Donnattsburg...........14

9. Slopes of the lower half and upper half of the main channel for 388

streamflow-gaging stations used in the study..............................................................15

10–14 Maps showing:

10. Areas in and adjacent to New York with elevations above 1,200 feet, as 

interpreted from 30-meter digital elevation model (DEM) data .................................16

11. Areas of urbanization, forest, and storage in and adjacent to New York, as

interpreted from the National Land Cover Dataset (NLCD) land-use data ..............18

12. Mean annual runoff in areas in and adjacent to New York........................................19

13. Mean annual precipitation in areas in and adjacent to New York............................20

14. Seasonal maximum snow depth (50th percentile) in areas in and adjacent to 

New York .............................................................................................................................21

15–21 Graphs showing:

15. Boxplots of 50-year peak-discharge residuals from the statewide regression 

for streamflow-gaging stations within six hydrologic regions of New York, 

before and after regionalization......................................................................................23

16. Boxplots of selected basin characteristics for streamflow-gaging stations

within six hydrologic regions of New York ....................................................................24

17. Boxplots of selected peak-discharge characteristics for streamflow-gaging

stations within six hydrologic regions of New York.....................................................26
vii

18. Distribution of streamflow-gaging stations within each of six hydrologic 

regions of New York and for all stations combined by (A) length of record, 

and (B) drainage-basin size .............................................................................................28

19. Monthly frequency of annual peak flows within each of six hydrologic 

regions of New York and for all streamflow-gaging stations combined for 

(A) all 388 study basins, and (B) 79 streams in small (less than 10-square miles) 

basins...................................................................................................................................30

20. Average flood-frequency curves for six hydrologic regions of New York and 

for all 388 study sites combined ......................................................................................41

21. Maximum, minimum, and average flood-frequency curves for six hydrologic 

regions of New York and for all 388 study sites combined .........................................42

Tables

1. Full-regression equations for estimating peak discharges for rural, unregulated

streams in each of six hydrologic regions of New York, excluding Long Island..............31

2. Standard errors of prediction and equivalent years of record for full regression

equations and drainage-area-only regression equations, for six hydrologic regions

of New York, excluding Long Island ........................................................................................33

3. Regression equations based on drainage area only for estimating peak discharges

for rural, unregulated streams in each of six hydrologic regions of New York,

excluding Long Island ................................................................................................................34

4. Minimum, maximum, and median values for basin characteristics used in the

regression analyses for six hydrologic regions in New York, excluding Long Island.....43

5. Results of sensitivity analysis-percent change in computed 50-year peak

discharges as a result of ±30-percent change in selected variables within

each of six hydrologic regions of New York, excluding Long Island .................................44

6. Selected statistics for skew coefficients for each of six hydrologic regions of 

New York, excluding Long Island.............................................................................................45

7. Location, drainage area, period of record, and maximum known discharge and

recurrence interval for rural, unregulated streams in New York, excluding 

Long Island...................................................................................................................................50

8. Peak discharge for 10 selected recurrence intervals on rural, unregulated streams

in New York, excluding Long Island.........................................................................................69

9. Location, drainage area, period of record, and calculated peak discharge for 10

recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island............................................................................................125

10. Data on selected basin characteristics of rural, unregulated streams in New York,

excluding Long Island ..............................................................................................................134
viii

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

(NGVD 29).

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

LIST OF ACRONYMS

AML Arc Macro language

DEM Digital elevation model

ESRI Environmental Systems Research Institute

GIS Geographic Information System

GLS Generalized least-squares

LSD Least significant difference

MSE Mean-square-error

NED National Elevation Dataset

NLCD National Land Cover Dataset

NRCC Northeast Regional Climate Center

OLS Ordinary least-squares

SAS Statistical Analysis System

SIM Simultaneous inference methods

STATGO State Soil Geographic

USGS U.S. Geological Survey

VIF Variance inflation factor

Conversion Factors, Datum and Acronyms

Multiply By To obtain

Length

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square mile (mi2) 2.590 square kilometer (km2) 

Volume

cubic foot (ft3) 0.02832 cubic meter (m3) 

Flow rate

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

cubic foot per second per square

mile [(ft3/s)/mi2] 

0.01093 cubic meter per second per square

kilometer [(m3/s)/km2]
Magnitude and Frequency of Floods in New York

By Richard Lumia, Douglas A. Freehafer, and Martyn J. Smith

Introduction

Flood damage along flood plains is a constant concern for 

local and regional water-resource managers and planners. The 

effective management of flood-prone areas, and the design 

of structures along rivers and streams, require knowledge 

of the magnitude and frequency of floods. Several previous 

U.S. Geological Survey (USGS) reports provide techniques 

for estimating the magnitude and frequency of floods on 

rural, unregulated streams in New York by the index-flood 

method (Robison, 1961; Speer and Gamble, 1965; Tice, 1968; 

Wiitala, 1965), by ordinary least-squares (OLS) multipleregression techniques (Darmer, 1970, and Zembrzuski 

and Dunn, 1979), and by generalized least-squares (GLS) 

multiple-regression techniques (Lumia, 1991). An additional 

12 years of annual peak discharge data, updated skews (Lumia 

and Baevsky, 2000) for computing station flood-frequency 

curves as outlined in U.S. Water Resources Council Bulletin 

17B (1981), and revised data on basin characteristics used 

for multiple-regression analyses enable refinement of the 

techniques established previously.

Since the 1990s, the USGS, in cooperation with New 

York State Department of Transportation, has been obtaining 

additional years of peak discharge records and has refined 

its basin characteristics data through geographic information 

system (GIS) coverages and techniques. The improved 

databases provide a basis for estimation of the magnitude 

and frequency of floods at gaged or ungaged sites on rural, 

unregulated streams in New York, excluding Long Island. 

Procedures for estimating peak discharges with recurrence 

intervals of 1.25, 1.5, 2, 5, 10, 25, 50, 100, 200, and 500 

years depend on whether the stream is gaged or ungaged, 

and whether its drainage basin crosses hydrologic-region 

boundaries or state lines. In this study, which was also 

conducted in cooperation with the New York State Department 

of Transportation, regression equations for six hydrologic 

regions of New York (excluding Long Island) were developed 

from data collected through September 1999 at 388 gaged 

sites in and adjacent to New York.

Development of techniques for estimating peak 

discharges at ungaged locations on regulated streams, 

Abstract

Techniques are presented for estimating the magnitude 

and frequency of flood discharges on rural, unregulated 

streams in New York, excluding Long Island. Peak-dischargefrequency data and basin characteristics from 388 streamflowgaging stations in New York and adjacent states were used 

to develop multiple linear regression equations for flood 

discharges with recurrence intervals ranging from 1.25 to 

500 years. A generalized least-squares (GLS) procedure was 

used to develop the regression equations. Separate sets of 

equations were developed for each of six hydrologic regions 

of New York; standard errors of prediction range from 14 to 

43 percent. Statistically significant explanatory variables in 

the regression equations include drainage area, main-channel 

slope, percent basin storage, mean annual precipitation, 

percent forested area, a basin lag factor, a ratio of mainchannel slope to basin slope, mean annual runoff, maximum 

snow depth, and percentage of basin above 1,200 feet. 

Drainage areas for the 388 sites used in the analyses ranged 

from 0.41 to 4,773 square miles.

Methods of computing flood discharges from the 

regression equations differ, depending on whether the estimate 

is for a gaged or ungaged basin, and whether the basin 

crosses hydrologic-region or state boundaries. Examples of 

computations are included. Discharge-frequency estimates for 

an additional 122 streamflow-gaging stations with significant 

regulation or urbanization (including Long Island) are also 

included as at-site estimates.

Basin characteristics, log-Pearson Type III statistics, and 

regression and weighted estimates of the discharge-frequency 

relations are tabulated for the streamflow-gaging stations used 

in the regression analyses. Sensitivity analyses showed that 

mean-annual precipitation, drainage area, mean annual runoff, 

and maximum snow depth are the variables to which computed 

discharges are most sensitive in the regression equations.

Included with the report is a DVD that provides 

computation procedures and geographic information system 

spatial datasets to compute basin characteristics used in the 

regional regression equations and flood-frequency estimates at 

a specified location on a stream.
urbanized basins, and streams on Long Island was beyond 

the scope of this study. Peak discharges for ungaged urban 

areas can be estimated through techniques of Sauer and 

others (1983). Flood characteristics of gaged stream locations 

that are urbanized (including Long Island sites) or regulated 

are presented herein as 122 at-site estimates only (these 

sites were not used in the development of the regional 

regression equations).

Purpose and Scope

This report presents techniques for estimating the 

magnitude and frequency of floods on rural, unregulated 

streams within six hydrologic regions of New York at gaged 

sites, ungaged sites, and ungaged sites on gaged streams. The 

information presented herein supersedes previous USGS data 

and reports on estimation of flood magnitude and frequency 

on rural, unregulated streams in New York.

The report discusses the delineation of the six hydrologic 

regions through statistical and hydrologic analyses and 

presents sets of equations for each of the six regions. It 

also describes use of the equations and includes sample 

computations, as well as tables of selected flood and basin 

characteristics data and summaries of statistical analyses.

Description of Study Area

Physiographic and geologic characteristics of New 

York that may help explain variations in streamflow were 

considered in the analysis and in the delineation of hydrologicregion boundaries (discussed in a later section). These factors 

affect the timing and magnitude of flood response, although 

many were not directly included in the regression equations. 

The area addressed in this study encompasses all of New York, 

excluding Long Island, as well as areas of adjacent states near 

the New York border.

Physiography

New York (excluding Long Island) encompasses parts or 

all of seven physiographic provinces (fig. 1), which range from 

high relief in the Adirondack and Catskill Mountains to low 

relief along the Great Lakes, the St. Lawrence River Valley, 

and the Hudson and Mohawk River Valleys. In northern 

New York, the Adirondack Province covers about 10,000 mi2. 

The western half of the province and parts of the southern 

and northern margins are plateaulike. Lakes and ponds are 

abundant (about 2,000), especially in and near the mountains. 

The eastern half of the Adirondack Province is mountainous; 

some elevations exceed 5,000 ft above sea level (Fenneman, 

1938). The St. Lawrence Valley of extreme northern New York 

is a smooth glacial plain with elevations dropping below 200 ft 

along the St. Lawrence River. The Mohawk River Valley, just 

south of the Adirondack Province, drains parts of the southern 

AdirondackMountains to the Hudson River.

The two major physiographic divisions of western 

New York are the Central Lowlands and the Appalachian 

Plateau. The Central Lowlands in New York extend east 

from Lake Erie, north of the Finger Lakes Region adjacent to 

Lake Ontario, to just west of the Mohawk and St. Lawrence 

River Valleys and the Adirondack Mountains. South of Lake 

Ontario, the lowland plain abuts the northern escarpment 

of the Appalachian Plateau, and east of Lake Ontario the 

plain comes to an end against the Tug Hill Plateau. Drainage 

throughout the Central Lowlands is generally toward 

Lakes Erie and Ontario. The Appalachian Plateau extends 

throughout the southern part of western New York east to 

and including the Catskill Mountains and southern sections 

of the Mohawk River Basin. The Appalachian Plateau is 

characterized by hilly terrain; its highest elevations are in the 

Allegheny and Catskill Mountains.

Physiographic divisions in eastern and southeastern New 

York include the Valley and Ridge Province, the New England

Province, and the Piedmont Province. The Valley and Ridge

Province extends from the New Jersey border, north through 

the lower Hudson River Valley to the southern end of Lake 

Champlain. Longitudinal drainage is prominent in the 

Hudson-Champlain section of the province. The New England

Province also extends from the New Jersey border northward, 

crossing the southern part of the Hudson River. It includes 

the Taconic Mountains, running along the southeastern 

border of New York north to just south of Lake Champlain. 

The Piedmont Province includes a small lowland area in 

southeastern New York just north of New Jersey.

Geology

Crystalline rocks dominate the Adirondack and 

New England Provinces but contain carbonate rocks in outcrop 

fringes (escarpments) along the northern and eastern edges 

of the Appalachian Plateau Province, in isolated areas of 

the St. Lawrence Valley, and in eastern New York. Shale, the 

most extensive bedrock unit, predominates in the Appalachian 

Plateau, western Central Lowland, the Mohawk Valley, 

and the Valley and Ridge Province. Sandstone dominates 

in the Piedmont, St. Lawrence Valley, and eastern Central 

Lowland Provinces.

Bedrock in New York is covered with glacial deposits of 

till and stratified drift of variable thickness. The till mantles 

the uplands and small tributary valleys and generally is found 

beneath stratified drift in the larger valleys. Stratified drift 

forms the floors of large valleys and flat plains or terraces 

where bedrock relief is low. The stratified drift includes clay, 

silt, sand, and meltwater deposits of sand and gravel. The 

sand and gravel deposits form the principal aquifer systems of 

New York.

 Magnitude and Frequency of Floods in New York
Climate

The climate of New York is the humid continental type; 

cool, dry air masses move generally eastward through the 

state throughout the year, and warm, humid maritime tropical 

air masses from the south move northeastward during the 

summer. Mean annual precipitation ranges from almost 30 in. 

along Lakes Ontario and Champlain to about 60 in. in the 

southern Catskill Mountains.

The areal distribution of precipitation reflects the 

topographic relief and the general eastward-to-northeastward 

movement of storms. New York has a fairly uniform 

distribution of precipitation during the year and has no distinct 

rainy or dry season.

Regional differences in topography, elevation, and 

proximity to large bodies of water result in a wide variation 

of snowfall throughout the state. Maximum seasonal 

snowfall, averaging more than 175 in., occurs on the western 

and southwestern slopes of the Adirondack Moountains 

and Tug Hill Plateau (National Oceanic and Atmospheric 

Administration, 1980). A secondary maximum of more than 

150 in. prevails some 10 to 30 mi inland from Lake Erie. The 

minimum seasonal snowfalls (25 to 35 in.) occur in extreme 

southeastern New York, and the minimum upstate snowfalls 

(40 to 50 in.) occur in the Chemung and mid-Genesee River 

Valleys and near the Hudson River in Orange, Rockland, 

and Westchester Counties up to southern Albany County. On 

average, some of the winter snowpack is still unmelted by 

mid-March over all but the extreme southeastern part of the 

state. In mid-March, as much as 10 in. of water content can 

still remain in the snowpack of the Adirondack Mountains and 

in the highlands to the east of Lake Ontario.

The greatest potential for floods is in the early spring, 

when substantial rains combine with rapid melting of snow to 

produce heavy runoff. Almost half of the state’s annual runoff 

occurs from mid-February through mid-May. Local flooding, 

primarily within smaller drainage basins, is generally caused 

by summer thunderstorms. Occasionally hurricanes can cause 

severe flooding, particularly in southeastern parts of the state.

0 50 MILES

0 50 KILOMETERS

42°

43°

79° 78°

77°

44°

76°

75° 74°

41° 73°

72°

Base from U.S. Geological Survey digital data, 1972, 1:2,000,000

Albers Equal-Area Conic projection

Standard parallels 20°30’ and 45°30’, central meridian -96°00’

Taconic Mountains

Hudson R vi er Valley

ST. LAWRENCE VALLEY

C A N A D A

ADIRONDACK

MOUNTAINS

TUG

HILL

 PLATEAU

CENTRAL LOWLANDS

APPALACHIAN PLATEAU

VALLEY

AND

RIDGE PRO

V NI CE

NEW ENGLA

N

D

PROVINCE

Mohawk River Valley

Finger Lakes Region

Catskill

Mountains

P E N N S Y L V A N I A

V E R M O N T

M A S S A C H U S E T T E S

C O N N E C T I C U T

N E W

J E R S E Y

Allegheny

Mountains

Lake Champlain

N E W Y O R K LAKE ERIE

PIEDMONT

PROVINCE

LAKE ONTARIO

Long Island

Figure 1. Physiographic provinces of New York, excluding Long Island (Modified from Lyford and others, 1984, figure 2).

Abstract 
Magnitude and Frequency of Flood 

Discharges

 This section of the report describes the database and 

the approach to developing equations used to estimate peak 

discharges for selected recurrence intervals at gaged and 

ungaged stream locations. A DVD that provides GIS datasets 

and procedures to compute flood frequencies is included with 

the report.

Database

The regression equations that provide estimates of the 

streamflow characteristics in this study were developed from 

records of annual peak discharges and basin-characteristic 

data from rural, unregulated gaging stations in New York 

(excluding Long Island) and adjacent states. Annual peakdischarges were obtained from the USGS peak-flow file; 

basin-characteristic and climate data were derived from (GIS) 

data sets and procedures.

Annual Peak-Discharge Records

The annual peak-discharge data that were the basis for 

this study were collected through September 1999 from 388 

continuous-record and partial-record streamflow-gaging 

stations (locations are shown in fig. 2). Of these sites, 341 

are in New York, and 47 are in adjacent states. Periods of 

peak-discharge record for these stations range from 10 to 

99 years. Flood frequencies for some sites where significant 

flooding has occurred since 1999 (through 2005) have been 

updated accordingly.

The annual peak flows that were selected for analysis 

were recorded at streamflow-gaging stations in rural areas that 

had at least 10 consecutive years’ record of unregulated flow. 

Streams were considered regulated if more than 25 percent 

of the drainage area above the streamflow-gaging station 

was upstream from a controlled reservoir, in accordance with 

analyses by Zembrzuski and Dunn (1979). An additional 

consideration in the assessment of significant effects of flood 

detention was the flood-control regulation criterion established 

by Benson (1962), namely, that basins with “usable storage” of 

more than 4.5 million ft3/mi2 are significantly affected by flood 

detention (storage could affect peak discharge by more than 

10 percent). Usable storage is the volume of water normally 

available for release from a reservoir, between the minimum 

and maximum controllable elevations. Based on available 

storage data, the 388 sites used in this study were considered 

unregulated. Sites were considered “urbanized” (not rural) 

if more than 15 percent of the drainage area was affected 

by manmade changes (impervious area, channelization, 

diversions, and so forth) (Sauer and others, 1983).

The drainage areas of the 388 gaging stations used in 

the analysis ranged from 0.41 to 4,773 mi2. A list of the 388 

streamflow-gaging stations used in the study, their locations, 

drainage area, period of record, maximum known discharge, 

and recurrence interval, is given in table 7 (at the end of the 

report). Much of the information in table 7 was published 

previously (Lumia and Murray, 1993).

A graph of 13,925 annual peak discharges recorded at the 

388 sites used in the study are plotted in relation to drainage 

area in figure 3; also shown are the 100-year peak discharges 

at each site (discussed later) and a maximum-known-discharge 

envelope curve for New York (Lumia and Murray, 1993). The 

envelope curve is based on discharges at 1,280 gaging stations 

throughout the State. At most of the 388 sites, the 100-year 

discharge exceeds the maximum discharge, yet most are well 

below the envelope curve for New York.

Annual peak discharges at 435 streamflow-gaging 

stations (including 47 urbanized basins) with at least 10 

consecutive years of record were examined for significant 

trends through the Kendall’s tau test. The tau value is a 

measure of the correlation between the annual peak series and 

time (years). A trend was considered significant if the p-value 

(probability that no trend is erroneously rejected) was less than 

or equal to 0.05. This represents a 95-percent confidence level. 

Trends in flow records can be difficult to detect where periods 

of record are short and where outliers are present. Of the 435 

sites having at least 40 years of record, a significant trend was 

indicated at 28 sites (6.4 percent of the sites). Of these trends, 

21 were positive (general increase in annual peak discharges 

through time) and 7 negative. Trends were indicated at 

some other sites, but the period of record at these gages was 

generally much shorter than 40 years. Many of the sites 

showing a positive trend are in the extreme southeastern part 

of New York or on Long Island, which have undergone more 

extensive development over the years than most other parts 

of the State. The effect of urbanization can be seen through 

a comparison of trends for two urban sites (figs. 4A, 4B) 

with that for a rural area (fig. 4C). The two urban sites show 

strong positive trends, whereas the rural site shows a small but 

statistically significant negative trend.

 Several other sites in the Susquehanna River Basin 

showed negative trends. The reason is unknown, but may be 

related to trends in precipitation and (or), to a lesser degree, 

ground-water levels (Rasmussen and Perry, 2001), or to 

extreme climatic anomalies near the beginning and the end of 

the record, to which the trend test is sensitive. The absolute 

value of the Kendall tau values for the 388 sites on rural, 

unregulated streams in this study was generally much lower 

than a “strong” value of about 0.7 or larger (Helsel and Hirsch, 

1992, p. 212). The absence of flow regulation and urbanization 

in these basins together with possible climatic influences at the 

388 sites suggests that any indicated trends probably were not 

a function of manmade changes that affect annual peak flows 

at these sites. Therefore, none of the 388 sites were excluded 

despite slight positive trends at some. Further study would be 

needed to explain the indicated trends.

A plot of annual peak runoff for all 388 sites from 1865 

through 2002 (fig. 5A), indicates a slight positive trend that 

 Magnitude and Frequency of Floods in New York
EXPLANATION

Region 1Region 2Region 3Region 4Region 5Region 6

Hydrologic Region

ST.LAWRENCE 

FRANKLIN

CLINTON

ESSEX

WARREN 

WASHINGTON 

SARATOGA 

RENSSELAER

JEFFERSON

LEWIS

HERKIMER

HAMILTON 

FULTON 

ONEIDA

OSWEGO

ONONDAGA

MADISON

OTSEGO

CHENANGO

DELAWARE 

SULLIVAN 

MONTGOMERY

SCHENECTADY 

ALBANY

SCHOHARIE

PUTNAM ORANGE

WESTCHESTER

ROCKLAND

SUFFOLK

COLUMBIA GREENE BROOME TIOGA CHEMUNG STEUBEN

CORTLANDCAYUGA 

TOMPKINS SCHUYLER

ALLEGANY CATTARAUGUS CHAUTAUQUA 

YATES 

SENECAONTARIO 

WAYNE MONROE

ORLEANS NIAGARA

ERIE

LIVINGSTON WYOMING

GENESEE

DUTCHESSULSTER

NASSAU

BRONX

QUEENS

KINGS RICHMOND

NY

1

2

3

4

5

6

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

0 100 MILES 25 50 75

25 100 KILOMETERS 0 50 75

LAKE ONTARIO

LAKE ERIE

44 ̊43 ̊42 ̊41 ̊

79 ̊ 78 ̊ 77 ̊ 76 ̊ 75 ̊ 74 ̊ 73 ̊ 80 ̊

45 ̊

NEW YORK

PENNSYLVANIA

NEW JERSEY

MASSACHUSETTS

CONNECTICUT

VERMONT

CANADA

LONG ISLAND

Figure 2. Six hydrologic regions of New York and locations of 388 streamflow-gaging stations represented in this study. (Map numbers refer to streamflowgaging stations shown in tables 7 and 8.)

Magnitude and Frequency of Flood Discharges 
63

62

54 53

52

50 51

49

48

16

15

14 13

12 11

47

46

45

44

43

40

39

33

32

31

30

29

28 27

25

24

23

22

21 20

19

18

17

386

381

380

379

378

377

375 376

374

373

372

371

370

369 367 368

366

365

364

363

362

361

360

359

358

357 356

355

354

353

352

351

350

349

348

347

346

345

344

343

342

341

340

339

338

337 336

335

334

333

332

331

330

329

325 324

35

34

388 387

36

42

41

38

37

26

385

384

383

382

New York 

Vermont 

Massachusetts

New York 

VT

MA

EXPLANATION

State boundary

County boundary

Region 1

24 Streamflow-gaging station

1

2 3

4 5

6

43 ̊

44 ̊

76 ̊

74 ̊

0 25 50 MILES

0 25 50 KILOMETERS

Figure 2. Six hydrologic regions of New York and locations of 388 streamflow-gaging stations represented in this study. (Map numbers 

refer to streamflow-gaging stations shown in tables 7 and 8.)—Continued

 Magnitude and Frequency of Floods in New York
Figure 2. Six hydrologic regions of New York and locations of 388 streamflow-gaging stations represented in this study. (Map numbers 

refer to streamflow-gaging stations shown in tables 7 and 8.)—Continued

Region 4

1

2 3

4 5

6

New York 

Massachusetts

New York 

MA

Connecticut

CT

New Jersey 

Pennsylvania

New York 

New York 

7

6

5 4

99

98

97 96 95

93 94

92

91

90

89

88

87

86

85

84

83

82 81

80

78 79

77

76

74 75

73

72

71

70

69

68 67

66

65

64

61 60

5958

57

56

55

196

195

194

193

192

191

190 189

188

187

186

185

184

183

182

181

180

179

178

177

176

175

174

173

172 171

170

169

168

167

166 165

164

163

162

161

160

156

155

154

153

152

151

150

149 148

147

146

145

144

142

141

140

139 138

137136

134

133

132

131

130

129

128 127

126

125

124

123 122 121

120

119 118

117

116 115

114

113

112

111

110

109

108

105

104

103 102 101

100

135

107

EXPLANATION

State boundary

County boundary

Region 2

Region 3

101 Streamflow-gaging station

41 ̊

42 ̊

76 ̊

74 ̊

0 25 50 MILES

0 25 50 KILOMETERS

9

8

3 2

1

10

157

159

158

143

106

Magnitude and Frequency of Flood Discharges 
1

2

3

4

5

6

EXPLANATIO

N

Streamflow-gaging stationRegion 5Region 6County boundaryState boundary

248

288

278 277

276

275 274

271

270

269

268 267

266

265

264

262

263 261

260

259 258

257

256

255

254 253

252 251

250

249

248

247

246

245

242

241

240

239 238

237

236 234

233

232

235

299

317

316

298

297 295

294

293

292

291

290

289

287

286

285

284

283

282

281

280 279

273

272

224

223

222

221

220

219

218

217

216 215

214

213

212

209 207

206 205

204

329

328

327 323 322 321 320

319

318

315

314

313

312

311

310 307

306

305

304

303

302 301 300

296

227

226

225

203

202 201

200

199

198

197

309

308

326

231

230

229

211

210

208

228

243

244

43 ̊

79 ̊

77 ̊

42 ̊

0 25 50 MILES

25 0 50 KILOMETERS

Pennsylvania

New York

Figure 2. Six hydrologic regions of New York and locations of 388 streamflow-gaging stations represented in this study. (Map numbers refer to streamflow-gaging stations shown in tables 7 and 8.)—Continued

 Magnitude and Frequency of Floods in New York
is not statistically significant. One reason for this trend may 

be that stations on several small streams were added to the 

network through time and small basins generally produce 

greater peak runoff than large basins. A plot of annual peak 

runoff at small streams (drainage area 10- to 50-mi2) from 

1913 through 2002 (fig. 5B) indicates a slightly negative trend, 

that is not statistically significant.

Magnitude and Frequency of Flood Discharges 

at Streamflow-Gaging Stations

The relation of flood-discharge to frequency of 

occurrence at a streamflow-measurement site is generally 

expressed in terms of exceedance probability or recurrence 

interval. Exceedance probability is the probability that a 

flood-discharge of specified magnitude will be equaled or 

exceeded in any 1 year. Recurrence interval, the reciprocal 

of exceedance probability, is the average time interval 

between occurrences of a flood-discharge of equal or greater 

magnitude. For example, a 100-year flood has a 1-percent 

chance of occurring in any 1-year period.

Four representative flood-frequency curves are depicted 

in figure 6. A flood-frequency curve for each of the 388 

gaging stations used in this study was developed by fitting 

the logarithms of the annual peak discharges to a Pearson 

Type-III distribution according to guidelines recommended 

by U.S. Water Resources Council (1981); the resulting data 

were analyzed through USGS flood-frequency programs 

(Kirby, 1981), and the frequency curves were adjusted to 

reflect historical information and high and low outliers. The 

coefficient of skewness was estimated as a weighted average 

of the systematic (station) skew and a generalized skew from 

a contoured skew map for New York (Lumia and Baevsky, 

2000). Results of the discharge-frequency analyses for each 

gaging station are summarized in table 8 (at the end of the 

report). Caution must be exercised in using information from 

some of the stations listed in table 8 because several of the 

streams are now regulated. The discharges given in table 8 

for streams that are currently regulated reflect pre-regulation 

periods and are not generally applicable to present conditions.

 Discharge-frequency estimates for 122 gaging stations on 

streams with significant regulation or urbanization are listed 

in table 9 (at the end of the report). The discharge-frequency 

estimates were derived from the annual peak-discharge data 

for the regulated or urbanized period using recommended 

statistical procedures discussed earlier (U.S. Water Resources 

Council, 1981). The high degree of regulation or urbanization 

required use of the station skew rather than a weighted skew. 

These 122 sites were not used in the regional regression 

Figure 3. Annual peak discharges and 100-year peak discharges for 388 rural, unregulated streamflow-gaging stations used in 

this study.

1

10

102

103

104

105

106

0.1 1 10 100 1,000 10,000

DRAINAGE AREA, IN SQUARE MILES

DISCHARGE, IN CUBIC FEET PER SECOND

Annual peak discharges

100-year peak discharges

Maximum known discharges (NY)

EXPLANATION

Magnitude and Frequency of Flood Discharges 
A. 01311000 -- Pines Brook at Malverne, Long Island

Kendall's Tau = 0.688

p-value = 0.000

0

100

200

300

400

500

600

700

800

900

1935 1945 1955 1965 1975 1985 1995

PEAK DISCHARGE, IN CUBIC FEET PER SECOND

B. 01302000 -- Bronx River at Bronxville

Kendall's Tau = 0.507

p-value = 0.000

0

500

1,000

1,500

2,000

2,500

1940 1950 1960 1970 1980 1990 2000

C. 01512500 -- Chenango River near Chenango Forks 

Kendall's Tau = -0.177

p-value = 0.015

0

20,000

40,000

60,000

80,000

100,000

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

WATER YEAR

NEW YORK

A. (urban)

B. (urban)

C. (rural) •

•

•

LOCATION MAP

Figure 4. Annual peak discharges and trend line for streams in two highly developed areas (A,B) and in an undeveloped area 

(C) in New York: (A) 01311000–Pines Brook at Malverne, (B) 01302000–Bronx River at Bronxville, and (C) 01512500–Chenango 

River near Chenango Forks. (Location and peak-discharge data are given in tables 8 and 9).

10 Magnitude and Frequency of Floods in New York
analyses. At regulated sites, no adjustments were made for 

the amount of available storage in the reservoirs before or 

during floods, nor for changes in regulation procedures during 

the period of regulation. Other methods to estimate floodfrequency curves at reservoir outlets are available and can be 

applied to these sites. Computed discharge-frequency curves 

for urbanized basins with many years of record may not 

represent current conditions if the degree of development has 

increased significantly through time. A period with a relatively 

constant degree of urbanization has been defined, as a general 

guideline, as a change in development (commercial, industrial, 

or residential) of less than 50 percent during the period of 

record (Sauer, 1983). The locations of streamflow-gaging 

stations on streams that currently have a substantial amount of 

regulation or urbanization are shown in figure 7.

As noted earlier, frequency curves are adjusted to account 

for historical information, outliers, and skew of the distribution 

of annual peak discharges. To illustrate the effects of a high 

outlier and a historic period-of-record, annual peak discharges 

(1913–2002) for Chenango River near Chenango Forks, 

as well as “moving” 100-year and 2-year flood discharges 

are shown in figure 8A. Revised values were calculated for 

the period following the first 10 years of peak-discharge 

record and plotted in a continuous line as each “new” year 

of peak-discharge record was added. The continuous lines 

show computed values with no adjustments for the historic 

period (the 1935 peak discharge is the highest since at least 

1865), whereas the triangles show computed discharges, for 

selected years, with such adjustment. The chart in figure 8A 

shows that the 1935 peak discharge had a major effect on the 

100-year discharge but only a minimal effect on the 2-year 

flood-discharge. A similar graph for Independence River at 

Donnattsburg (fig. 8B) shows the effect of major floods much 

later during the record (early and mid-1980s) with no historic 

A. ALL SITES

1

10

100

1,000

1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

PEAK RUNOFF, IN CUBIC FEET PER SECOND PER SQUARE MILE

B. SMALL STREAM SITES

1

10

100

1,000

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

YEAR

Figure 5. Annual peak discharges and trend lines for (A) all study sites and (B) all small stream (10- to 50-square miles) study sites.

Magnitude and Frequency of Flood Discharges 11
(pre-1943) information available. The computed 100-year 

discharge from the 1950s through 1980 was slightly more than 

4,000 ft3/s; it then increased to nearly 7,000 ft3/s after the flood 

of 1985. Again, the 2-year moving flood discharge showed 

little fluctuation during the period of record. The graphs in 

figure 8 give examples of the effect that high outliers and 

historic information can have on flood-frequency analyses 

(and the subsequent design of bridges and culverts).

Basin Characteristics

Peak-discharge information can be transferred to 

ungaged sites through multiple regression analysis that 

relates streamflow characteristics (such as 100-year flood 

discharge) to selected topographic and climatic characteristics 

for each gaged drainage basin. Values for many of the basin 

characteristics used in this study were obtained through 

a GIS in conjunction with a 30-m digital elevation model 

(DEM) (U.S. Geological Survey, 2001); the values for several 

characteristics were derived from a computer program through 

procedures described in Harvey and Eash (1995).

 More than 60 basin and climate characteristics were 

tested for statistically significant correlation with peak flows 

during the regression analyses. Among those tested were 

drainage area, basin length, basin perimeter, average basin 

slope, basin relief, basin azimuth, basin width, basin-shape 

factor, basin-elongation ratio, basin rotundity, compactness 

ratio (basin perimeter to circumference of a circle of equal 

area), relative relief (basin relief to basin perimeter), total 

stream length, main-channel length, main-channel slope, 

main-channel sinuosity ratio (main-channel length to basin 

length), stream density (total stream length to drainage 

area), constant of channel maintenance (reciprocal of stream 

density), main-channel slope proportion (main-channel length 

to main-channel slope), ruggedness number (stream density 

times basin relief), slope ratio of main-channel slope to basin 

slope, number of first-order streams, basin stream order, 

drainage frequency (number of first-order streams per square 

mile), relative stream density (drainage frequency to stream 

density), basin-shape index, average main-channel elevation, 

minimum basin elevation, maximum basin elevation, 

average basin elevation, elevation at gage, percentage of 

basin that is urbanized, percentage of basin that is forested, 

percentage of basin with grasslands, percentage of basin 

storage, mean annual precipitation, mean annual snowfall, 

precipitation ratio (mean annual snowfall to mean annual 

precipitation), maximum seasonal snow depth, 100-year 

24-hour precipitation, water equivalent of snowfall, total 

snowfall, mean annual runoff, average angle of basin slope, 

slope of lower half of main channel, slope of upper half of 

Figure 6. Examples of flood-frequency curves for selected streamflow-gaging stations along the Hudson River in New York.

1,000

2,000

3,000

4,000

5,000

6,000

8,000

10,000

20,000

30,000

40,000

50,000

60,000

01318500 - Hudson River at Hadley, NY

01315500 - Hudson River at North Creek, NY

01314000 - Hudson River at Gooley near Indian Lake, NY

01312000 - Hudson River near Newcomb, NY

1.11 1.25 1.5 2.0 5 10 25 50 100 200 500

RECURRENCE INTERVAL, IN YEARS

(number in parentheses is exceedance probability)

(0.900) (0.800) (0.667) (0.500) (0.200) (0.100) (0.040) (0.020) (0.010) (0.005) (0.002)

PEAK DISCHARGE, IN CUBIC FEET PER SECOND

Site 17 in figure 2

Site 15 in figure 2

Site 14 in figure 2

Site 12 in figure 2

12  Magnitude and Frequency of Floods in New York
ST.LAWRENCE 

FRANKLIN

CLINTON

ESSEX

WARREN 

WASHINGTON 

SARATOGA 

RENSSELAER

JEFFERSON

LEWIS

HERKIMER

HAMILTON 

FULTON 

ONEIDA

OSWEGO

ONONDAGA

MADISON

OTSEGO

CHENANGO

DELAWARE 

SULLIVAN 

MONTGOMERY

SCHENECTADY 

ALBANY

SCHOHARIE

PUTNAM ORANGE

WESTCHESTER

ROCKLAND

SUFFOLK

COLUMBIA GREENE BROOME TIOGA CHEMUNG STEUBEN

CORTLANDCAYUGA 

TOMPKINS SCHUYLER

ALLEGANY CATTARAUGUS CHAUTAUQUA 

YATES 

SENECAONTARIO 

WAYNE MONROE

ORLEANS NIAGARA

ERIE

LIVINGSTON WYOMING

GENESEE

DUTCHESSULSTER

NASSAU

BRONX

QUEENS

KINGS RICHMOND

NY

0 100 MILES 25 50 75

25 100 KILOMETERS 0 50 75

EXPLANATION

LAKE ONTARIO

LAKE ERIE

44 ̊43 ̊42 ̊41 ̊

79 ̊ 78 ̊ 77 ̊ 76 ̊ 75 ̊ 74 ̊ 73 ̊ 80 ̊

45 ̊

NEW YORK 

RegulatedUrbanized

PENNSYLVANIA 

NEW JERSEY 

MASSACHUSETTS

CONNECTICUT

VERMONT

CANADA

(numbers denote stationslisted in table 9)

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

622

621

620

619

618

617

616

615

614

613 612

611 610

609

608

607

606

605 604 603 602

601

600

599

598

597

596

595 594

593

592 591

590

589

588

587

586

585

584

583

582

581

580

579

578

577

576 575

574

573

572 571

570

569

568

567

566

565 564

563

562

561

560

559

558

557 556 555

554

553

552

551 550 549548

547

546

545

544 543 542 541

540

539

538

537 536

535

534

533 532

531

529 528

527

526525524523522521519518517

515

516

514

509 508

507

506

505

504

503 502

501

530

581

510

513

512 520

511

510

Figure 7. Locations of 122 streamflow-gaging stations on regulated and urbanized streams in New York. (Site numbers and their names, locations, and peak discharges for 10 recurrence intervals are given in table 9, at end of report).

Magnitude and Frequency of Flood Discharges 13
main channel, percentage of basin above selected elevations, 

basin lag factor (relating main-channel length and slope), and 

several soil properties, including permeability, percent clay 

content, percent organic matter, and so forth. The variables 

that were selected for use in the final regression equations are 

defined as follows:

Drainage area (A), in square miles.—The area of a basin 

upstream from the gage or site of interest, delineated on 

7.5-minute USGS topographic maps, then calculated by 

digitizing the basin outline (Wagner, 1982).

Main-channel stream length (L), in miles.— The longest 

flow distance measured along the main stream channel from 

B. 04256000 -- Independence River at Donnattsburg

0

2,000

4,000

6,000

8,000

10,000

1940 1950 1960 1970 1980 1990 2000

WATER YEAR

PEAK DISCHARGE, IN CUBIC FEET PER SECOND

Annual peak

Moving 2-year flood

Moving 100-year flood

2002 50-year flood

2002 25-year flood

2002 10-year flood

A. 01512500 -- Chenango River near Chenango Forks

0

20,000

40,000

60,000

80,000

100,000

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

Annual peak

Moving 2-year flood

Moving 100-year flood

Historic adjusted 100-year flood

2002 50-year flood

2002 25-year flood

2002 10-year flood

Figure 8. Annual peak discharges and moving 100- and 2-year flood discharges for two streamflow-gaging stations in New York: 

(A) 01512500 – Chenango River near Chenango Forks, and (B) 04256000 – Independence River at Donnattsburg. (Station locations are 

shown on figure 2, site 336, table 8).

14  Magnitude and Frequency of Floods in New York
the gage or point of interest to the top of the basin. The main 

channel was derived from the 30-m DEM (U.S. Geological 

Survey, 2001).

Main-channel slope (SL), in feet per mile.— The difference 

in elevation (feet) between points 10 percent and 85 percent of 

the distance along the main stream channel from the gage or 

site of interest to the top of the basin, divided by the distance 

(miles) between the two points.

Slope of the lower half of the main channel (SL_LO), in 

feet per mile.— The difference in elevation (feet) between 

points 10 percent and 85 percent of the distance along the 

lower half of the main channel from the gage or site of interest 

to the midpoint of the entire main channel, divided by the 

distance (miles) between the two points.

Slope of the upper half of the main channel (SL_UP), in 

feet per mile.— The difference in elevation (feet) between 

points 10 percent and 85 percent of the distance along the 

upper half of the main channel from the midpoint of the entire 

main channel to the top of the basin, divided by the distance 

(miles) between the two points. Figure 9 shows a plot of the 

slopes of the upper and lower halves of the main channel for 

the 388 gaging stations used for this study.

Average basin slope (BS), in feet per mile.— Slope measured 

by the contour-band method, within the contributing drainage 

area, where BS = [(total length of all selected elevation 

contours) (contour interval)] / A.

Slope ratio (SR) of main channel slope to basin slope, 

dimensionless.— Computed within the drainage basin as 

SL / BS.

Basin lag factor (LAG).— Computed as main channel length 

divided by the square root of the product of the slopes (plus 

one) of the upper and lower halves of the main channel, 

L / [(SL_UP+1) (SL_LO+1)] 0.5 .

Percentage of drainage basin at or greater than 1,200 feet 

above sea level (EL12).—Computed from the 30-m DEM 

(U.S. Geological Survey, 2001). A relief map showing the 

areas above 1,200 feet is given in figure 10.

1

10

100

1,000

1 10 100 1,000

SLOPE OF LOWER HALF OF MAIN CHANNEL,

IN FEET PER MILE

SLOPE OF UPPER HALF OF MAIN CHANNEL,

IN FEET PER MILE

Region 1

Region 2

Region 3

Region 4

Region 5

Region 6

Line of equal slope

Figure 9. Slopes of the lower half and upper half of the main channel for 388 streamflow-gaging stations used in the study. 

(Hydrologic regions are shown in figure 2).

Magnitude and Frequency of Flood Discharges 15
Figure 10. Areas in and adjacent to New York with elevations above 1,200 feet, as interpreted from 30-meter digital elevation model (DEM) data 

(U.S. Geological Survey, 2001).

80o 78o 76o 74o

45o44o43o42o41o

EXPLANATION

Areas above 1,200 feet elevation

0 50 100 Miles 25

0 50 100 Kilometers 25

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

16  Magnitude and Frequency of Floods in New York
Basin storage (ST), in percent.— Percentage of total drainage 

area shown as lakes, ponds, or swamps (wetlands) in the 

National Land Cover Dataset (NLCD) (U.S. Geological 

Survey, 2000) land-use data. A generalized land-use map of 

New York and adjacent States showing areas of storage, as 

well as urban and forested land, is given in figure 11.

Basin forested area (FOR), in percent.— Percentage of total 

drainage area shown as forest cover in the National NLCD) 

(U.S. Geological Survey, 2000 land-use data. A generalized 

land-use map of New York and adjacent States showing areas 

of forested land, as well as urban land and areas of basin 

storage, is given in figure 11.

Mean annual runoff (RUNF), in inches.— The average value 

for the basin calculated from a gridded contour map of mean 

annual runoff for 1951–80 (Randall, 1996). A map of New 

York and adjacent States showing mean annual runoff is given 

in figure 12.

Mean annual precipitation (P), in inches.— The average 

value for the basin calculated from a gridded contour map of 

mean annual precipitation for 1951–80 (Randall, 1996). A 

map of New York and adjacent States showing mean annual 

precipitation is given in figure 13.

Seasonal maximum snow depth, 50th percentile (MXSNO), 

in inches.— The average value for the basin computed from 

Northeast Regional Climate Center (NRCC) atlas of snowfall 

and snow depth (Cember and Wilks, 1993). A map of New 

York and adjacent States showing seasonal maximum snow 

depth is given in figure 14.

Of the 14 variables that were selected for this analysis, 

eight represent aspects of basin morphology (L, SL, SL_LO, 

SL_UP, BS, SR, LAG, EL12 ). Their values were calculated 

for each gaged basin from the 30-m National Elevation Dataset 

(U.S. Geological Survey, 2001). The basis for computation 

of all basin characteristics was the drainage basin outlines 

that had been manually delineated by Wagner (1982). Figure 

9 shows a plot of the slopes of the lower half and the upper 

half of the main channel for each of 388 streamflow-gaging 

stations used in the study. The sites are shown by hydrologic 

region. Most slopes of the upper half of main channels are 

greater than the lower half, but several sites indicate the lower 

half to be steeper than the upper half. Further investigation 

is needed to determine what effect these main channel slope 

conditions have on resulting peak discharges.

Two of the 14 selected variables represent land-cover 

characteristics (ST and FOR). Their values for each site were 

computed from NLCD for 1992 at a 30-m cell size (U.S. 

Geological Survey, 2000). Storage (ST) represented the openwater and wetland categories; forest cover (FOR) represented 

three categories combined (deciduous, evergreen, and mixed). 

The degree of urbanization in a basin was calculated as the 

sum of (0.4) low-density residential, high-density residential, 

and commercial land. Urbanization was calculated only to 

determine if a site should be excluded from the analysis. It was 

not a variable in the regression analyses.

Mean annual runoff (RUNF) values were taken from 

an analysis by Randall (1996), that was based primarily on 

records of streamflow (1951–80) at 503 gaged sites across the 

Northeast. The resulting contour map was gridded through 

GIS techniques to compute the average runoff value for each 

basin in this study.

Mean-annual precipitation (P) values were taken from an 

analysis by Randall (1996) that was based primarily on records 

of precipitation (1951–80) at 483 precipitation stations across 

the Northeast. Precipitation values were compared to runoff 

values for consistency and adjusted accordingly (Randall, 

1996). Average values were computed for each gaged basin.

Average values for seasonal maximum snow depth, 50th

percentile (MXSNO) were computed from the Northeast 

Regional Climate Center (NRCC) atlas of snowfall and snow 

depth. A raster dataset was developed from the contour map 

in the atlas, and an average value for each gaged basin was 

computed. The period of record for climate stations used 

in the atlas was from October 1955 through April 1992 for 

Northeastern states (Cember and Wilks, 1993).

Values for each of the 14 variables used in the regional 

regression analyses are listed by USGS site number in table 10 

(at the end of the report).

Regression Analysis

Multiple regression analysis was used to develop the 

relations between peak discharges of selected recurrence 

intervals (response variable) and drainage-basin characteristics 

(the 14 selected explanatory variables). Previous regression 

analyses for New York used (OLS) procedures (Zembrzuski 

and Dunn, 1979) and (GLS) procedures (Lumia, 1991). 

The OLS estimates are appropriate if three conditions are 

met: (1) all flow estimates are equally reliable, (2) the 

natural variability is the same for each site, and (3) observed 

concurrent flows at every pair of sites are independent of 

each other. In practice, available data seldom fully meet these 

requirements, however.

Research by Stedinger and Tasker (1985) and Tasker and 

Stedinger (1989) showed that GLS may be more appropriate 

for hydrologic regression than OLS. In this approach, 

the regression coefficients are estimated by taking into 

consideration the time-sampling error (length of record at 

each site) and the cross correlation of annual peak-discharges 

between sites. This research has shown that the GLS 

procedure was superior to OLS where streamflow data are 

cross correlated and (or) have differing lengths of record.

GLS regression entails weighting each basin in 

accordance with the variance (time-sampling error) and 

spatial-correlation structure of the streamflow characteristic 

(annual peak discharges); it also accounts for the timesampling error in the streamflow characteristic when the 

accuracy of the regression equation is evaluated. The 

prediction error for ungaged sites is partitioned into regression 

error (error in assuming an incomplete regression form) 

Magnitude and Frequency of Flood Discharges 17
Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000

Universal Transverse Mercator projections, zone 18, NAD83

44 ̊43 ̊42 ̊41 ̊

79 ̊ 78 ̊ 77 ̊ 76 ̊ 75 ̊ 74 ̊ 73 ̊ 80 ̊

45 ̊

EXPLANATION

UrbanForestStorage

0 50 100 MILES 25

0 50 100 KILOMETERS 25

80o 78o 76o 74o

45o44o43o42o41o

Figure 11. Areas of urbanization, forest, and storage in and adjacent to New York, as interpreted from the National Land Cover Dataset (NLCD) land-use data (U.S. Geological Survey, 2000).

18  Magnitude and Frequency of Floods in New York
Figure 12. Mean annual runoff in areas in and adjacent to New York. (as interpreted from Randall, 1996)

20

10

30

40

30

20

40

20

20

20

30

20

10

40

20

30

30

30

30

30

30

30

30

30

30 30

30

30

30

20

30

20

20

20

30

20

20

20

20 LINE OF EQUAL RUNOFF

(contour interval, 10 inches)

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

0 50 100 MILES 25

0 50 100 KILOMETERS 25

Mean annual runoff

INCHES

EXPLANATION

42

8

25

44 ̊43 ̊42 ̊41 ̊

78 ̊ 76 ̊ 74 ̊ 80 ̊

45 ̊

Magnitude and Frequency of Flood Discharges 19
Figure 13. Mean annual precipitation in areas in and adjacent to New York. (as interpreted from Randall,1996)

34

30

34

38

42

38

42

46

46

50

46

38

42

46

34

38

42

42

42

38

42

5550

46

60

55

50

55

38

46

50

42

38

34

34

30

42

46

42

46

50

42

46

50

55

60

46

42

46

46

50

50

50

50

42

38

46

50

46

50

50

50

42

50

46

38

42

50

55

60

46

46

38

42

50

38

38

38

42

38

46

38 42

46 50 50 50

42

44 ̊43 ̊42 ̊41 ̊

78 ̊ 76 ̊ 74 ̊ 80 ̊

45 ̊

INCHES

6027

EXPLANATION

Mean annual precipitation

LINE OF EQUAL PRECIPITATION

(contour interval, 4 inches)

44

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

0 50 100 MILES 25

0 50 100 KILOMETERS 25

20 Magnitude and Frequency of Floods in New York
Figure 14. Seasonal maximum snow depth (50th percentile) in areas in and adjacent to New York. (as interpreted from Cember and Wilks, 1993)

44 ̊43 ̊42 ̊41 ̊

78 ̊ 76 ̊ 74 ̊ 80 ̊

45 ̊

0 50 100 25 MILES

0 50 100 25 KILOMETERS

EXPLANATION

INCHES

304

Seasonal maximum snow depth

(50th percentile)

17

20 LINE OF EQUAL SNOW DEPTH

(contour interval, 2 inches)

Base from U.S. Geological Survey, Digital Line Graph, 1:2,000,000Universal Transverse Mercator projections, zone 18, NAD83

8

16

14

12

18

10

20

22

28

26

18

20

18

20

24

16

8

18

12

20

10

16

16

22

24

14

20

22

24

20

18

16

14

12

10

8

Magnitude and Frequency of Flood Discharges  21
and sampling error (time- and spatial-sampling errors). The 

regression error cannot be decreased through additional data 

collection, whereas the sampling error can (through extended 

operation of existing stations or installation of new stations, or 

some combination of both).

The GLS regression analysis used in this study entailed 

logarithmic (base 10) transformations of the streamflow 

(annual peak discharges) and basin characteristics to obtain 

a constant variance of the residuals about the regression 

line, and to linearize the relation between the response 

variable (peak-discharge) and explanatory variables (basin 

characteristics) for linear least-squares regression procedures. 

The multiple-regression equations based on logarithmic 

transformation of the variables are of the form:

 , (1)

or, after taking antilogs:

 , (2)

where

Y = response variable (peak-discharge for 

selected recurrence interval),

b0 to bn = regression model coefficients estimated 

through GLS procedures,

and 

X1 to Xn = explanatory variables (basin characteristics).

Selection of final explanatory variables for each 

equation was based on stepwise regression algorithms and 

all-possible-subsets regression (SAS Institute, 1982). Final 

regression equations were selected on the basis of several 

factors, including: standard error of the estimate, Mallow’s Cp 

statistic, statistical significance of the explanatory variables, 

r2 (coefficient of determination), ease of measurement of 

explanatory variables, and the PRESS statistic (an index of 

the prediction error associated with the regression equation). 

Multicollinearity in the regression models was assessed by 

the variance inflation factor (VIF) and the correlation between 

explanatory variables.

Regionalization of Flood-Frequency Estimates

Regression analysis provides a means of relating peak 

discharge to basin characteristics. Variability of the relation 

between peak discharge and basin characteristics among gaged 

sites can be reduced by regionalization, a process in which an 

area is divided into hydrologic regions to account for regional 

differences in peak-discharge response and in topographic and 

climatic variables that affect streamflow. Hydrologic regions 

refer to areas in which streamflow-gaging stations indicate 

a similarity of peak-discharge response that differs from the 

peak-discharge response in adjacent regions. These similarities 

and differences are defined by the regression residuals, which 

log log log ..... log 10 Y b0 1 10 1 2 10 2 10 = + b X + + b X + b X n n log log log ..... log 10 Y b0 1 10 1 2 10 2 10 = + b X + + b X + b X n n

Y X X X b b b

n

bn =10 0 1 2

1 2 ( )( ).....( )

Equation 2

Y X X X b b b

n

bn =10 0 1 2

1 2 ( )( ).....( )

Equation 2

are the differences between the peak discharges calculated 

from station records (log-Pearson type III estimates) and the 

values computed through the regression equations.

Delineation of Hydrologic Regions

The initial step in delineating hydrologic regions was to 

develop a statewide regression equation through OLS method. 

The response variable was the 50-year peak discharge, and the 

five most significant explanatory variables for the statewide 

equation were found to be drainage area, main-channel slope, 

basin storage, mean annual runoff, and water equivalent of 

snow cover.

Six hydrologic regions within New York were identified 

and delineated primarily through inspection of the areal 

distribution of the statewide regression residuals. Areas 

where the regression equation consistently overestimated or 

underestimated the peak-discharge response were delineated 

as discrete hydrologic regions, and separate GLS regression 

equations were developed to estimate peak-discharge 

frequencies for each region. Regional differences in geologic 

and physiographic conditions were also considered during the 

delineation; generally, the hydrologic-region boundaries were 

delineated to coincide with drainage-basin divides and are 

shown in figure 2.

The distribution of regression residuals for each 

hydrologic region before and after regionalization is shown in 

box plots in figures 15A and 15B, respectively. The upper plot 

(fig. 15A) depicts the clustering of residuals within the final 

six hydrologic regions before regionalization; the lower plot 

(fig. 15B) shows the distribution of the final GLS regression 

residuals for the six hydrologic regions after regionalization. 

The 50-year peak-discharge was the response variable. 

Comparison of the two plots shows the regression residuals 

after regionalization to have a smaller range, as well as median 

values at or near zero.

A further evaluation of the hydrologic region delineations 

used statistical tests to compare residuals among the six 

regions; the results indicated a normal distribution of residuals 

within each of the six regions. Multiple comparison tests 

were then used to identify which regions’ means differed 

statistically from the other regions’ mean. The six regions 

sample sizes were unequal, ranging from 39 in Region 3 

to 109 in Region 1; therefore, two simultaneous inference 

methods (SIM)—Fisher’s Least Significant Difference (LSD) 

test (t-tests) and Tukey’s multiple comparison test—were 

used (Helsel and Hirsch, 1992). Both tests yielded the 

following comparisons of means of residuals among the six 

hydrologic regions: 

for adjacent regions 1 = 2 < 3 > 4 < 5 > 6 < 1 > 4 = 6 < 1 < 3.

A few adjacent regions had mean residuals that did not 

differ statistically from each other (the regional residuals 

shown above that are statistically equal), but other factors, 

such as topography, geology, climate, and hydrologic 

judgment, indicate that delineation of these areas as separate 

hydrologic regions is justified.

22  Magnitude and Frequency of Floods in New York
Regional Basin and Peak-Discharge 

Characteristics

Basin and peak-discharge characteristics were compared 

among regions to summarize and evaluate their differences 

(figs. 16–17). The range and distribution of values for the 14 

basin characteristics are plotted by region in figure 16; the 

range and distribution of seven peak-discharge statistics are 

plotted by region in figure 17. The data in figure 16 indicate 

that the basins with the greatest main channel slopes, greatest 

average basin slopes, and greatest mean annual runoff are in 

Region 3 (Catskill Mountains) (figs. 16C, F, L); those with the 

greatest basin-storage values are in regions 1 (northern New 

York) and 2 (lower Hudson River Valley) (fig. 16J). Basins 

with the greatest snow depth are in Region 1 (fig. 16N).

The statistics for annual peak discharges (fig. 17) indicate 

that basins with the greatest means and standard deviations are 

in hydrologic regions 3 and 2, respectively (figs. 17A, 17B), 

and those with the greatest 50- and 1.5-year peak-discharge 

runoff rates are in Region 3 (fig. 17E, 17F). Basins with the 

greatest median number of years of annual peak-discharge 

record are within Region 4 (upper Susquehanna River basin 

area), whereas those with the lowest are in Region 6 (area 

south of Lake Ontario) (fig. 17G).

The distribution of gaging stations, by length of period 

of annual peak-discharge record, is plotted in figure 18A, 

Figure 15. Boxplots of 50-year peak-discharge residuals from the statewide regression for streamflow-gaging stations 

within six hydrologic regions of New York, before and after regionalization. (Region boundaries are shown in figure 2).

1 2 3 4 5 6

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

Mean

75th percentile

25th percentile

Median (50th percentile)

Largest value

Smallest value

EXPLANATION

HYDROLOGIC REGION

1 2 3 4 5 6

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

A. BEFORE REGIONALIZATION

B. AFTER REGIONALIZATION

RESIDUALS, IN LOGS OF CUBIC FEET PER SECOND

Magnitude and Frequency of Flood Discharges  23
Figure 16. Boxplots of selected basin characteristics for streamflow-gaging stations within six hydrologic regions of New York. 

(Region boundaries are shown in figure 2).

1 2 3 4 5 6

0.1

1

10

100

1,000

8,000

1 2 3 4 5 6

1

2

5

10

20

50

100

200

500

1 2 3 4 5 6

1

2

5

10

20

50

100

200

500

1,000

A. DRAINAGE AREA (A)

B. MAIN CHANNEL

 LENGTH (L)

C. MAIN CHANNEL SLOPE (SL)

DRAINAGE AREA,

IN SQUARE MILES

MAIN CHANNEL LENGTH,

IN MILES

MAIN CHANNEL SLOPE,

IN FEET PER MILE 

HYDROLOGIC REGION

1 2 3 4 5 6

0.1

1

10

100

1,000

1 2 3 4 5 6

1

10

100

1,000

5,000

1 2 3 4 5 6

50

100

200

500

1,000

2,000

3,000

D. MAIN CHANNEL SLOPE OF

 LOWER HALF OF BASIN

 (SL_LO) 

E. MAIN CHANNEL SLOPE OF

 UPPER HALF OF BASIN

 (SL_UP)

F. AVERAGE BASIN SLOPE (BS)

1 2 3 4 5 6

0.001

0.002

0.005

0.01

0.02

0.05

0.1

0.2

0.5

1

HYDROLOGIC REGION

G. SLOPE RATIO (SR)

SLOPE, IN FEET PER MILE

SLOPE RATIO BASIN SLOPE, IN FEET PER MILE SLOPE, IN FEET PER MILE

EXPLANATION

Mean

75th percentile

25th percentile

Median (50th percentile)

Largest value

Smallest value

24  Magnitude and Frequency of Floods in New York
HYDROLOGIC REGION

1 2 3 4 5 6

7.5

10.0

12.5

15.0

17.5

20.0

22.5

25.0

27.5

30.0

N. MAXIMUM SEASONAL SNOW

 DEPTH, 50th PERCENTILE (MXSNO) 

1 2 3 4 5 6

20

25

30

35

40

45

50

55

60

65

M. MEAN ANNUAL PRECIPITATION (P)

1 2 3 4 5 6

0.01

0.1

1

10

50

1 2 3 4 5 6

0

10

20

30

40

50

60

70

80

90

100

HYDROLOGIC REGION

1 2 3 4 5 6

0

5

10

15

20

25

30

35

40

45

J. BASIN STORAGE (ST)

K. FOREST COVER (FOR)

L. MEAN ANNUAL RUNOFF (RUNF)

1 2 3 4 5 6

0

20

40

60

80

100

I. PERCENT BASIN AREA

 ABOVE 1,200 FEET (EL12)

PERCENT BASIN ABOVE 1,200 FEET BASIN STORAGE, IN PERCENT FOREST COVER, IN PERCENT

RUNOFF, IN INCHES PRECIPITATION, IN INCHES MAXIMUM SNOW DEPTH, IN INCHES

EXPLANATION

1 2 3 4 5 6

0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

10

20

50

100

H. BASIN LAG FACTOR (LAG)

BASIN LAG FACTOR

Mean

75th percentile

25th percentile

Median (50th percentile)

Largest value

Smallest value

Figure 16. Boxplots of selected basin characteristics for streamflow-gaging stations within six hydrologic regions of New York. 

(Region boundaries are shown in figure 2).—Continued

Magnitude and Frequency of Flood Discharges  25
Figure 17.  Boxplots of selected peak-discharge characteristics for streamflow-gaging stations within six hydrologic regions of

New York. (WRC data represents computations based on Water Resources Council guidelines of 1981). (Region boundaries are

shown in figure 2).

Mean

75th percentile

25th percentile

Median (50th percentile)

Largest value

Smallest value

EXPLANATION

LOGS OF CUBIC FEET PER SECOND

1 2 3 4 5 6

1.0

2.0

3.0

4.0

5.0

6.0

1 2 3 4 5 6

0.07

0.08

0.1

0.2

0.3

0.4

0.5

0.6

1 2 3 4 5 6

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

A. WRC MEAN OF ANNUAL

 PEAK DISCHARGES

B. WRC STANDARD DEVIATION OF

ANNUAL PEAK DISCHARGES

C. STATION SKEW OF ANNUAL PEAK DISCHARGES

HYDROLOGIC REGION

1 2 3 4 5 6 -0.8

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1 2 3 4 5 6 10

20

50

100

200

500

800

1 2 3 4 5 6

2

5

10

20

50

100

200

D. WRC SKEW OF ANNUAL PEAK DISCHARGES

E. 50-YEAR PEAK DISCHARGE RUNOFF RATE

F. 1.5-YEAR PEAK DISCHARGE RUNOFF RATE

1 2 3 4 5 6

10

20

30

40

50

60

70

80

90

100

110

0

DISCHARGE, IN CUBIC FEET PER SECOND PER SQUARE MILE YEARS OF RECORD

HYDROLOGIC REGION

G. YEARS OF ANNUAL PEAK DISCHARGES

26 Magnitude and Frequency of Floods in New York
which indicates that the region with the most stations with a 

record greater than 55 years is Region 1, and the region with 

the fewest is Region 6. The distribution of gaging stations by 

size of drainage area is plotted in figure 18B; the region with 

the greatest number of stations with small drainage areas (less 

than 5 mi2), is Region 1, and the one with the smallest number 

of large basins (>200 mi2) is Region 6.

A comparison of the monthly frequency of annual peak 

discharges in each hydrologic region, and for all stations 

combined, was made to provide an indication of flood 

seasonality (fig. 19). Results indicate that most annual peak 

discharges in every hydrologic region occur in March and 

April (fig. 19A), as do those in all drainage areas, regardless of 

size (fig. 19B).

Regional Regression Equations

Regression equations were developed for each of the 

six hydrologic regions from (1) all 14 statistically significant 

explanatory variables (full regression equations) and 

(2) drainage area only. GLS procedures were used for all 

regional-regression analyses.

Full-Regression Equations

The multiple-variable regression equations developed 

through GLS procedures were used to estimate peak 

discharges for 10 recurrence intervals (1.25, 1.5, 2, 5, 10, 25, 

50, 100, 200, and 500 years) in each of the six hydrologic 

regions and are presented in table 1. Estimates of the standard 

error of prediction and equivalent years of record for each 

of these regression equations (Hardison, 1971) are given in 

table 2, which includes similar data for the drainage-area-only 

equations (given in table 3). The prediction error indicates the 

expected accuracy of the regression equations when applied to 

ungaged sites not used in the regression analyses. The standard 

errors of prediction for the six hydrologic regions range from 

14.1 percent (Region 3) to 42.6 percent (Region 5). Peakdischarge estimates for ungaged sites are expected to be within 

one standard error (of prediction) of the true value about 

68 percent of the time. An additional measure of the predictive 

ability of the equations is the equivalent years of record (table 

2), which is a function of three factors—the average variability 

and skew of the annual peak-discharges at sites in a hydrologic 

region, the accuracy of the regression equation, and the 

recurrence interval in question (Tasker and Stedinger, 1989). 

Equivalent years of record represent the number of years of 

gage data needed to achieve results with accuracy comparable 

to that given by the regression equations. Regression estimates 

used to compute peak discharges at gaged sites and at ungaged 

sites near gaged sites are weighted by the equivalent years of 

record for the equation. (See section “Computation of Peak 

Discharge,” p. 35.)

Several of the explanatory variables in the full-regression 

equations (table 1) require addition or subtraction of constants 

before the equation is applied. These constants were identified 

through sensitivity analyses, normality of the distribution of 

a variable within its region, improvement in standard error 

of estimate, coefficient of determination (r2 ), and the PRESS 

statistic (an index for prediction error).

Drainage-Area-Only Equations

Alternative GLS regression equations that contain only 

the most significant basin characteristic (drainage area) were 

developed for each of the six hydrologic regions. These 

equations (table 3) have higher standard errors than the GLS 

full-regression equations (table 2).

The purpose of drainage-area-only equations (table 3) is 

to obtain estimates of peak discharges more easily (although 

less accurately) than those obtained by the full equations. 

The drainage-area-only equations exponents for each 

region (table 3) can be useful in transferring peak-discharge 

information upstream or downstream from a gaged site 

according to the ratio of the ungaged sites drainage area to 

the gaged sites drainage area, raised to the exponent power 

(Wandle, 1983).

Magnitude and Frequency of Flood Discharges 27
Figure 18.  Distribution of streamflow-gaging stations within each of six hydrologic regions of New York and for all stations

combined by (A) length of record, and (B) drainage-basin size. (Region boundaries are shown in figure 2).

Region 1 Region 2

0

2

4

6

8

10

12

14

16

Region 3

0

2

4

6

8

10

12

Region 4

0

2

4

6

8

10

12

14

16

Region 5

0

5

10

15

20

25

0

2

4

6

8

10

12

14

16

A. STATION RECORD LENGTH, IN YEARS

All stations

0

20

40

60

80

100

A. STATION RECORD LENGTH, IN YEARS

Region 6

Number of

stations

Average

length

of record

Region (years)

1 108 37.1

2 63 36.8

3 39 30.6

4 49 34.8

5 80 35.8

6 49 27.9

All sites 388 34.7

10 to 14

15 to 24

85 to 100

25 to 3435 to 44

45 to 5455 to 64

65 to 74

75 to 84

0

5

10

15

20

25

30

10 to 1415 to 24

85 to 100

25 to 3435 to 4445 to 5455 to 6465 to 7475 to 84

NUMBER OF STATIONS

10 to 14

15 to 24

85 to 100

25 to 34

35 to 44

45 to 54

55 to 64

65 to 7475 to 84

10 to 14

15 to 24

85 to 100

25 to 34

35 to 44

45 to 54

55 to 64

65 to 74

75 to 84

10 to 14

15 to 24

85 to 100

25 to 34

35 to 44

45 to 54

55 to 6465 to 7475 to 84

10 to 14

15 to 24

85 to 100

25 to 34

35 to 44

45 to 54

55 to 64

65 to 74

75 to 84

10 to 14

15 to 24

85 to 100

25 to 34

35 to 44

45 to 54

55 to 6465 to 7475 to 84

28 Magnitude and Frequency of Floods in New York
Figure 18.  Distribution of streamflow-gaging stations within each of six hydrologic regions of New York and for all stations

combined by (A) length of record, and (B) drainage-basin size. (Region boundaries are shown in figure 2).—Continued

Number of

stations

Range in regional

drainage areas,

Region in square miles

1 108

2 63

3 39

4 49

5 80

6 49

All sites 388

0.54 - 4,500

1.93 - 996

0.41 - 3,480

0.61 - 3,941

1.70 - 4,773

0.58 - 2,467

0.41 - 4,773

Region 1

0

5

10

15

20

25

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200

>200 to 500

>500 to 1,000

>1,000 to 5,000

Region 2

0

4

8

12

16

Region 3

0

2

4

6

8

10

Region 4

0

2

4

6

8

10

Region 5

0

2

4

6

8

10

12

14

16

NUMBER OF STATIONS

Region 6

0

2

4

6

8

10

12

All stations B. DRAINAGE AREA, IN SQUARE MILES

0

10

20

30

40

50

60

70

B. DRAINAGE AREA, IN SQUARE MILES

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200>200 to 500

>500 to 1,000

>1,000 to 5,000

0 to 5

>5 to 15

>15 to 25>25 to 50

>50 to 100

>100 to 200>200 to 500

>500 to 1,000

>1,000 to 5,000

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200

>200 to 500

>500 to 1,000

>1,000 to 5,000

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200>200 to 500

>500 to 1,000

>1,000 to 5,000

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200>200 to 500

>500 to 1,000

>1,000 to 5,000

0 to 5

>5 to 15

>15 to 25

>25 to 50

>50 to 100

>100 to 200

>200 to 500

>500 to 1,000

>1,000 to 5,000

Magnitude and Frequency of Flood Discharges 29
Figure 19.  Monthly frequency of annual peak flows within each of six hydrologic regions of New York and for all

streamflow-gaging stations combined for (A) all 388 study basins, and (B) 79 streams in small (less than 10 square miles)

basins. (Region boundaries are shown in figure 2).

A. All study sites (388 gages)

0

10

20

30

40

J F M A M J J A S O N D

MONTH

FREQUENCY, IN PERCENT

Region 1

Region 2

Region 3

Region 4

Region 5

Region 6

New York

B. Small drainage areas (79 gages)

0

10

20

30

J F M A M J J A S O N D

MONTH

FREQUENCY, IN PERCENT

EXPLANATION

30 Magnitude and Frequency of Floods in New York
Table 1.  Full-regression equations for estimating peak discharges for rural, unregulated streams

in each of six hydrologic regions of New York, excluding Long Island.

[A, drainage area, in square miles; ST, basin storage, in percent; P, mean annual precipitation, in inches; 

LAG, basin lag factor; FOR, basin forested area, in percent; RUNF, mean annual runoff, in inches; 

MXSNO, seasonal maximum snow depth, 50th percentile, in inches; SR, slope ratio; SL, main channel 

slope, in feet per mile; EL12, percent of basin above 1,200 feet; Q, flow. subscript is recurrence interval; 

thus, Q2 refers to discharge with 2-year recurrence interval]

Recurrence 

interval (years) Full-regression equation *

Region 1

Q 1.25 = 69.0 (A) 0.972 (ST+1) -0.160 (P) 1.859 (LAG+1) -0.355 (FOR+80) –1.514

Q 1.5 = 144 (A) 0.973 (ST+1) -0.164 (P) 1.718 (LAG+1) -0.383 (FOR+80) –1.519

Q 2 = 299 (A) 0.972 (ST+1) -0.169 (P) 1.576 (LAG+1) -0.411 (FOR+80) –1.518

Q 5 = 1180 (A) 0.970 (ST+1) -0.178 (P) 1.335 (LAG+1) -0.460 (FOR+80) –1.530

Q 10 = 2310 (A) 0.968 (ST+1) -0.184 (P) 1.241 (LAG+1) -0.482 (FOR+80) –1.549

Q 25 = 4580 (A) 0.965 (ST+1) -0.192 (P) 1.167 (LAG+1) -0.500 (FOR+80) –1.582

Q 50 = 7030 (A) 0.963 (ST+1) -0.197 (P) 1.131 (LAG+1) -0.511 (FOR+80) –1.610

Q 100 = 10300 (A) 0.962 (ST+1) -0.202 (P) 1.106 (LAG+1) -0.520 (FOR+80) –1.638

Q 200 = 14500 (A) 0.960 (ST+1) -0.206 (P) 1.086 (LAG+1) -0.528 (FOR+80) –1.667

Q 500 = 22000 (A) 0.959 (ST+1) -0.210 (P) 1.067 (LAG+1) -0.539 (FOR+80) –1.704

Region 2

Q 1.25 = 32.2 (A) 0.943 (ST+5) -0.943 (LAG+1) –0.294 (RUNF) 0.588

Q 1.5 = 32.5 (A) 0.936 (ST+5) -0.962 (LAG+1) –0.306 (RUNF) 0.672 

Q 2 = 33.3 (A) 0.928 (ST+5) -0.976 (LAG+1) –0.318 (RUNF) 0.759 

Q 5 = 37.6 (A) 0.914 (ST+5) -0.985 (LAG+1) –0.356 (RUNF) 0.905 

Q 10 = 41.6 (A) 0.909 (ST+5) -0.977 (LAG+1) –0.385 (RUNF) 0.968

Q 25 = 46.5 (A) 0.905 (ST+5) -0.958 (LAG+1) –0.418 (RUNF) 1.029 

Q 50 = 49.7 (A) 0.902 (ST+5) -0.939 (LAG+1) –0.441 (RUNF) 1.068 

Q 100 = 52.3 (A) 0.900 (ST+5) -0.918 (LAG+1) –0.461 (RUNF) 1.104 

Q 200 = 54.3 (A) 0.898 (ST+5) -0.894 (LAG+1) –0.479 (RUNF) 1.138 

Q 500 = 55.9 (A) 0.895 (ST+5) -0.860 (LAG+1) –0.500 (RUNF) 1.183 

Region 3 

Q 1.25 = 0.038 (A) 0.959 (LAG+1) -0.141 (RUNF) 1.234 (MXSNO) 1.037

Q 1.5 = 0.052 (A) 0.961 (LAG+1) -0.161 (RUNF) 1.142 (MXSNO) 1.110

Q 2 = 0.051 (A) 0.962 (LAG+1) -0.179 (RUNF) 1.009 (MXSNO) 1.360

Q 5 = 0.083 (A) 0.965 (LAG+1) -0.215 (RUNF) 0.776 (MXSNO) 1.632

Q 10 = 0.103 (A) 0.963 (LAG+1) -0.228 (RUNF) 0.658 (MXSNO) 1.794

Q 25 = 0.117 (A) 0.957 (LAG+1) -0.239 (RUNF) 0.524 (MXSNO) 2.016

Q 50 = 0.119 (A) 0.953 (LAG+1) -0.244 (RUNF) 0.430 (MXSNO) 2.195

Q 100 = 0.115 (A) 0.951 (LAG+1) -0.249 (RUNF) 0.341 (MXSNO) 2.375

Q 200 = 0.111 (A) 0.949 (LAG+1) -0.253 (RUNF) 0.255 (MXSNO) 2.547

Q 500 = 0.105 (A) 0.948 (LAG+1) -0.258 (RUNF) 0.147 (MXSNO) 2.759

Region 4 

Q 1.25 = 0.037 (A) 1.029 (ST+0.5) -0.104 (RUNF) 2.308 (SR) 0.317

Q 1.5 = 0.064 (A) 1.022 (ST+0.5) -0.120 (RUNF) 2.205 (SR) 0.320

Q 2 = 0.115 (A) 1.012 (ST+0.5) -0.139 (RUNF) 2.092 (SR) 0.319

Q 5 = 0.424 (A) 0.992 (ST+0.5) -0.189 (RUNF) 1.822 (SR) 0.316

Q 10 = 0.829 (A) 0.981 (ST+0.5) -0.219 (RUNF) 1.685 (SR) 0.314 

Q 25 = 1.585 (A) 0.970 (ST+0.5) -0.250 (RUNF) 1.559 (SR) 0.312 

Q 50 = 2.330 (A) 0.963 (ST+0.5) -0.269 (RUNF) 1.489 (SR) 0.312

Q 100 = 3.243 (A) 0.957 (ST+0.5) -0.285 (RUNF) 1.431 (SR) 0.312

Q 200 = 4.350 (A) 0.952 (ST+0.5) -0.300 (RUNF) 1.380 (SR) 0.313

Q 500 = 6.163 (A) 0.946 (ST+0.5) -0.317 (RUNF) 1.320 (SR) 0.315

Magnitude and Frequency of Flood Discharges 31
Table 1.  Full-regression equations for estimating peak discharges for rural, unregulated

streams in each of six hydrologic regions of New York, excluding Long Island.—Continued

[ A, drainage area, in mi2; ST, basin storage, in percent; P, mean annual precipitation, in inches; 

LAG, basin lag factor; FOR, basin forested area, in percent; RUNF, mean annual runoff, in inches; 

MXSNO, seasonal maximum snow depth, 50th percentile, in inches; SR, slope ratio; SL, main channel 

slope, in ft/mi; EL12, percent of basin above 1,200 ft; Q, flow. subscript is recurrence interval; thus, Q2

refers to discharge with 2-year recurrence interval]

Recurrence 

interval

(years) Full-regression equation *

Region 5 

Q 1.25 = 0.020 (A) 0.971 (SL) 0.377 (P) 1.625

Q 1.5 = 0.040 (A) 0.968 (SL) 0.402 (P) 1.468

Q 2 = 0.083 (A) 0.965 (SL) 0.431 (P) 1.305

Q 5 = 0.322 (A) 0.965 (SL) 0.498 (P) 0.995

Q 10 = 0.597 (A) 0.967 (SL) 0.538 (P) 0.853

Q 25 = 1.05 (A) 0.972 (SL) 0.581 (P) 0.724 

Q 50 = 1.46 (A) 0.976 (SL) 0.610 (P) 0.651

Q 100 = 1.91 (A) 0.980 (SL) 0.636 (P) 0.590

Q 200 = 2.43 (A) 0.984 (SL) 0.659 (P) 0.536

Q 500 = 3.22 (A) 0.989 (SL) 0.688 (P) 0.473

Region 6

Q 1.25 = 4.50 (A) 0.811 (ST+0.5) –0.270 (RUNF) 0.840 (EL12+1) 0.066 (SR) 0.168

Q 1.5 = 6.36 (A) 0.809 (ST+0.5) –0.265 (RUNF) 0.790 (EL12+1) 0.079 (SR) 0.190

Q 2 = 8.98 (A) 0.807 (ST+0.5) –0.258 (RUNF) 0.740 (EL12+1) 0.093 (SR) 0.209

Q 5 = 17.1 (A) 0.807 (ST+0.5) –0.234 (RUNF) 0.646 (EL12+1) 0.120 (SR) 0.248

Q 10 = 23.4 (A) 0.810 (ST+0.5) –0.218 (RUNF) 0.600 (EL12+1) 0.133 (SR) 0.268

Q 25 = 32.1 (A) 0.815 (ST+0.5) –0.200 (RUNF) 0.555 (EL12+1) 0.148 (SR) 0.290

Q 50 = 39.0 (A) 0.819 (ST+0.5) –0.188 (RUNF) 0.528 (EL12+1) 0.157 (SR) 0.305

Q 100 = 46.0 (A) 0.823 (ST+0.5) –0.177 (RUNF) 0.505 (EL12+1) 0.166 (SR) 0.318

Q 200 = 53.2 (A) 0.828 (ST+0.5) –0.167 (RUNF) 0.487 (EL12+1) 0.173 (SR) 0.330

Q 500 = 62.7 (A) 0.834 (ST+0.5) –0.155 (RUNF) 0.466 (EL12+1) 0.183 (SR) 0.345

* A -- Drainage area, in square miles. Area of basin upstream from gaging station or site of interest.

L -- Main-channel stream length, in miles. Longest distance from gaging station or site of interest to top of basin.

SL -- Main-channel slope, in feet per mile. Difference in elevation (feet) between points 10 percent and 85 percent of the distance 

along main stream channel, from the gage or site of interest to the top of the basin, divided by distance (miles) between the two 

points.

SL_LO -- Slope of lower half of main channel, in feet per mile. Difference in elevation (feet) between points 10 percent and 

85 percent of distance along lower half of main channel from gage or point of interest to midpoint of entire main channel, divided by 

distance (miles) between the two points.

SL_UP -- Slope of upper half of main channel, in feet per mile. Difference in elevation (feet) between points 10 percent and 85 

percent of distance along upper half of main channel from midpoint of the entire main channel to the top of the basin, divided by 

distance (miles) between the two points.

BS -- Average basin slope, in feet per mile. Measured by contour-band method within contributing drainage area and equal to [(total 

length of all selected elevation contours) (contour interval)] / A .

SR -- Slope ratio. Ratio of main-channel slope to basin slope within the drainage basin, computed as SL / BS . 

LAG -- Basin lag factor. Calculated as L / [( SL_UP + 1) ( SL_LO + 1)] 0.5 .

EL12 -- Percentage of drainage basin at or greater than 1,200 feet above sea level. 

ST -- Basin storage. Percentage of total drainage area shown as lakes, ponds, and swamps (wetlands) as interpreted from National 

Land Cover Dataset (NLCD) land-use data (U.S. Geological Survey, 2000).

FOR -- Basin forested area. Percentage of total drainage area shown as forest cover, as interpreted from NLCD land-use data 

(U.S. Geological Survey, 2000).

RUNF -- Mean annual runoff, in inches. (from Randall, 1996). 

32 Magnitude and Frequency of Floods in New York
Table 2.  Standard errors of prediction and equivalent years of record for full regression equations and

drainage-area-only regression equations, for six hydrologic regions of New York, excluding Long Island.

[SE, standard error of prediction. Region boundaries are shown in figure 2; regression equations are given in tables 1 and 3]

Recurrence 

interval 

(years)

Full equations

Drainage-area-only 

equations

Average SE 

(percent)

Equivalent 

years of 

record

Average SE

(percent)

Equivalent

years of 

record

Region 4

1.25 29.4 3.1 34.4 2.3

1.5 28.8 2.6 34.1 1.9

2 27.9 2.5 33.6 1.7

5 24.7 4.2 32.3 2.5

10 23.1 6.5 31.7 3.5

25 22.0 9.9 31.7 4.8

50 21.6 12.6 32.1 5.8

100 21.6 15.0 32.5 6.7

200 21.7 17.1 33.2 7.5

500 22.4 19.4 34.2 8.5

Region 5

1.25 38.5 2.2 42.4 1.7

1.5 38.0 1.9 41.9 1.5

2 37.4 2.0 41.6 1.6

5 36.3 3.4 41.8 2.5

10 36.1 4.9 42.9 3.4

25 36.7 7.0 44.9 4.6

50 37.5 8.5 46.7 5.4

100 38.7 9.7 48.9 6.1

200 40.2 10.8 51.2 6.6

500 42.6 11.8 54.6 7.2

Region 6

1.25 34.7 2.3 48.2 1.2

1.5 33.3 2.0 48.5 1.0

2 32.3 1.9 49.1 0.9

5 32.2 2.4 51.0 1.0

10 32.9 3.1 52.5 1.3

25 34.4 3.9 54.4 1.7

50 35.8 4.5 56.0 2.0

100 37.2 4.9 57.6 2.2

200 39.0 5.2 59.3 2.5

500 41.4 5.5 61.7 2.7

Recurrence 

interval 

(years)

Full equations

Drainage-area-only 

equations

Average SE 

(percent)

Equivalent 

years of 

record

Average SE

(percent)

Equivalent

years of 

record

Region 1

1.25 31.6 2.2 45.9 1.0

1.5 30.3 2.0 44.6 0.9

2 29.0 2.1 43.4 1.0

5 27.3 3.6 42.0 1.6

10 27.2 5.1 42.1 2.2

25 28.2 6.9 42.9 3.0

50 29.4 8.0 44.0 3.6

100 30.8 8.8 45.4 4.2

200 32.5 9.4 47.0 4.6

500 35.1 9.8 49.2 5.1

Region 2

1.25 25.5 4.8 43.1 1.8

1.5 25.6 4.3 44.6 1.5

2 25.8 4.4 46.1 1.5

5 27.0 7.3 48.5 2.4

10 28.2 10.1 49.8 3.5

25 29.9 13.6 51.2 5.0

50 31.5 15.8 52.3 6.2

100 33.3 17.6 53.5 7.4

200 35.3 18.9 54.9 8.5

500 38.4 20.1 56.9 9.9

Region 3

1.25 26.4 5.1 48.3 1.6

1.5 23.5 8.4 46.8 1.4

2 23.6 5.4 44.7 1.6

5 20.4 11.3 39.9 3.0

10 18.7 19.4 37.4 4.8

25 16.6 36.1 35.3 7.9

50 15.4 54.2 34.1 10.6

100 14.6 76.7 33.3 13.4

200 14.1 100.8 32.8 16.4

500 14.1 128.5 32.6 20.2

Magnitude and Frequency of Flood Discharges 33
Table 3.  Regression equations based on drainage area only for estimating peak discharges for rural, unregulated

streams in each of six hydrologic regions of New York, excluding Long Island.

[Corresponding full equations are given in table 1. Region boundaries are shown in figure 2. A, drainage area;Q, flow. Subscript is 

recurrence interval; thus, Q2 refers to discharge with 2-year recurrence interval] 

Region 1 Region 2 Region 3

Q 1.25 = 31.7 (A) 0.857 Q 1.25 = 43.4 (A) 0.772 Q 1.25 = 57.4 (A) 0.861

Q 1.5 = 38.5 (A) 0.848 Q 1.5 = 56.1 (A) 0.758 Q 1.5 = 71.8 (A) 0.857

Q 2 = 47.6 (A) 0.839 Q 2 = 74.7 (A) 0.743 Q 2 = 90.8 (A) 0.853

Q 5 = 73.0 (A) 0.822 Q 5 = 139 (A) 0.712 Q 5 = 144 (A) 0.850

Q 10 = 92.1 (A) 0.813 Q 10 = 197 (A) 0.695 Q 10 = 185 (A) 0.848

Q 25 = 119 (A) 0.802 Q 25 = 291 (A) 0.677 Q 25 = 249 (A) 0.843

Q 50 = 140 (A) 0.796 Q 50 = 378 (A) 0.666 Q 50 = 304 (A) 0.840

Q 100 = 162 (A) 0.790 Q 100 = 480 (A) 0.656 Q 100 = 367 (A) 0.836

Q 200 = 186 (A) 0.785 Q 200 = 598 (A) 0.648 Q 200 = 436 (A) 0.832

Q 500 = 219 (A) 0.779 Q 500 = 782 (A) 0.638 Q 500 = 539 (A) 0.827

Region 4 Region 5 Region 6

Q 1.25 = 39.1 (A) 0.833 Q 1.25 = 54.8 (A) 0.800 Q 1.25 = 31.1 (A) 0.783

Q 1.5 = 48.7 (A) 0.823 Q 1.5 = 71.5 (A) 0.785 Q 1.5 = 37.2 (A) 0.782

Q 2 = 61.3 (A) 0.812 Q 2 = 95.4 (A) 0.770 Q 2 = 44.5 (A) 0.782

Q 5 = 97.4 (A) 0.788 Q 5 = 172 (A) 0.738 Q 5 = 62.7 (A) 0.788

Q 10 = 124 (A) 0.775 Q 10 = 237 (A) 0.722 Q 10 = 74.2 (A) 0.794

Q 25 = 161 (A) 0.761 Q 25 = 332 (A) 0.706 Q 25 = 88.4 (A) 0.801

Q 50 = 191 (A) 0.751 Q 50 = 412 (A) 0.695 Q 50 = 98.5 (A) 0.807

Q 100 = 221 (A) 0.743 Q 100 = 502 (A) 0.687 Q 100 = 108 (A) 0.813

Q 200 = 253 (A) 0.735 Q 200 = 600 (A) 0.679 Q 200 = 117 (A) 0.818

Q 500 = 298 (A) 0.727 Q 500 = 745 (A) 0.670 Q 500 = 129 (A) 0.826

34 Magnitude and Frequency of Floods in New York
Computation of Peak Discharge

Methods for computing a peak discharge estimate for a selected recurrence interval at a specific site depend on whether 

the site is gaged or ungaged, and whether the drainage area lies within a single hydrologic region or crosses into an adjacent 

hydrologic region or State. Estimates for gaged and ungaged sites are described below with examples for each method.

Gaged Sites

The GLS regional-regression equations can be used to improve streamflow-gaging-station estimates (based on log-Pearson 

type III flood-frequency analysis of the gaged annual peak-discharge record) by using a weighted average of the two estimates 

(regression and gaged). Incorporating the regression estimate into the weighted average tends to decrease time sampling errors 

that result for sites with short periods of record. All three estimates — those based on the station record, those derived through 

regression, and the weighted average for each recurrence interval at each of the 388 streamflow-gaging stations used in this 

study are given in table 8 (at the end of the report). The weighted-average discharges are generally the most reliable and are 

computed from the equation:

, (3)

where

QT(w) is weighted peak discharge at the gaged site, in cubic feet per second, for the T-year recurrence interval;

QT(g) is peak discharge at gage, in cubic feet per second, calculated through log-Pearson Type III frequency analysis 

of the station’s peak discharge record, for the T-year recurrence interval;

N is number of years of annual peak-discharge record used to calculate QT(g) at the gaging station;

QT(r) is regional regression estimate of the peak discharge at the gaged site, in cubic feet per second, for the T-year 

recurrence interval;

and

E is average equivalent years of record associated with the regression equation (table 2) that was used to 

calculate QT(r).

Ungaged Sites

The following methods may be used to estimate peak discharges of selected recurrence intervals for sites on four types 

of ungaged streams: (1) where the drainage area is within a single hydrologic region; (2) where the drainage area extends into 

an adjacent hydrologic region or State; (3) where the ungaged site is near a gaged site on the same stream, and (4) where the 

ungaged site is between two gaged sites on the same stream. Methods for each of these conditions are described below:

If the drainage area of an ungaged site lies entirely within a single hydrologic region (fig. 2), peak discharges for selected 

recurrence intervals are computed from the regression equations for that region (table 1).

If the drainage area of an ungaged site extends into an adjacent hydrologic region or state, the percentage that lies within 

each hydrologic region and (or) state is estimated. Peak-discharge estimates are computed for the entire drainage basin 

through each of the appropriate regional or State equations, and the drainage-area percentages are used as weighting factors 

by multiplying the percentages by the corresponding peak-discharge estimate; the resulting values are then summed to 

compute the peak discharge for the entire basin. Equations for the five adjacent states are given in USGS or State floodfrequency reports for New Jersey (Stankowski, 1974), Pennsylvania (Stuckey and Reed, 2000), Connecticut (Ahearn, 2004), 

Massachusetts (Wandle, 1983), and Vermont (Olson, 2002).

If the ungaged site for which flood-frequency estimates are needed is on a gaged stream, and if the site’s drainage area is 

between 50 and 150 percent of the drainage area of the stream at the gage, the weighted estimate for the ungaged site can be 

computed by the following equation (Ries and Crouse, 2002):

 , (4)

1.

2.

3.

Q Q N Q E

N E T w

T g T r

( )

( )( ) ( )( ) = +

+

q

Q Q N Q E

N E T w

T g T r

( )

( )( ) ( )( ) = +

+

q

Q A

A Q AA T U w Q

g

T U r

g

( ) = + ( ) − T U( )g

















2 1 ∆ 2∆ Q A

A Q AA T U w Q

g

T U r

g

( ) = + ( ) − T U( )g

















2 1 ∆ 2∆

Magnitude and Frequency of Flood Discharges 35
where

QT(U)w is the weighted estimate of discharge QT for recurrence interval T at the ungaged site, is the absolute value 

of the difference between the drainage areas of the streamflow-gaging station, (Ag) and the ungaged site, 

(Au), |Ag - Au|,

QT(U)r is the peak-flow estimate for recurrence interval T at the ungaged site, derived from the applicable regional 

regression equation (table 1),

and

QT(U)g is the peak-flow estimate for recurrence interval T at the ungaged site, derived from the weighted estimate of 

peak discharge at the streamflow-gaging station, QT(w) (see method for gaged sites), by adjusting for the effect 

of the difference in drainage area between the streamflow-gaging station and the ungaged site.

QT(U)g is computed as:

 , (5)

where

depending on the hydrologic region and the recurrence interval T, b is the exponent from the 

appropriate drainage-area-only equation (table 3).

4. If the ungaged site is on a gaged stream, and lies between two gaging stations, the following equation (Hodgkins, 1999) 

is used:

 , (6)

where

QT(uf)w is final weighted flow estimate for the ungaged site between gaging stations;

QT(u1)w is the weighted flow estimate computed for the ungaged site from the upstream-gage records as described in 

method 3 above;

Ag2 is the drainage area of the downstream gage;

Au is the drainage area of the ungaged site;

QT(u2)w is the weighted flow estimate computed for the ungaged site from the downstream-gage records as described in 

method 3 above;

and

Ag1 is the drainage area of the upstream gage.

Sample Computations

The following examples illustrate use of the four methods described for ungaged sites to calculate the 50-year peak 

discharge for a gaged site and three types of ungaged sites. Variables are explained in tables 1 and 3.

∆A

Q A

A T U g Q u

g

b

( ) = T w( )















 ⋅

Q A

A T U g Q u

g

b

( ) = T w( )















 ⋅

Q Q T u( ) f w =  T u( )w g ( ) A A − u T + − Q A ( ) u w ( ) u gA A( ) g gA  

 1 2 2 1 2 1 −

Equation 6

Q Q T u( ) f w =  T u( )w g ( ) A A − u T + − Q A ( ) u w ( ) u gA A( ) g gA  

 1 2 2 1 2 1 −

Equation 6

36 Magnitude and Frequency of Floods in New York
Example 1. Gaged site whose drainage area lies within a single hydrologic region: Estimate the 50-year peak discharge at the 

gage site on Fishkill Creek at Hopewell Junction, NY (01372800).

Given:

Gaged drainage basin is in hydrologic Region 2 (fig. 2);

Drainage area (A) = 57.3 mi2 (table 10);

Area of lakes, ponds, and wetlands [basin storage (ST)] = 4.97 percent of total drainage area (table 10);

Basin lag factor (LAG) = L / [(SL_UP+1)(SL_LO+1)]0.5;

SL_UP = 27.53 ft/mi; SL_LO = 12.67 ft/mi; L = 21.00 mi (table 10),

LAG = 21.00 / [(27.53 + 1)(12.67 + 1)] 0.5

 = 21.00 / 19.75

 = 1.063 (table 10);

Mean annual runoff (RUNF) = 21.29 in. (table 10);

The 50-year peak-discharge (Q50(g)) based on the gaged record = 3,600 ft3/s (table 8);

Number of years (N) of systematic annual peak-discharge record used to calculate (Q50(g)) = 30 years (table 8).

Solution:

The 50-year regression estimate (Q50(r)) for this station is computed from the following equation for hydrologic Region 2 

(table 1):

 .

From the given values for these four basin characteristics:

 = 4,210 ft3/s (also in table 8).

The equivalent years of record (E) for Q50(r) for Region 2 is 15.8 years (table 2). Therefore, the weighted peak-discharge Q50(w)

for this station (method for gaged sites) is:

 = 3,810 ft3/s (also in table 8).

a)

b)

c)

d)

e)

f)

g)

Q A 50 r ST LAG RUNF 0 902 0 939 0 441 1 068 49 7 5 1 ( )

. . . . = . ( ) ( + ) ( + ) ( ) − −

Equation 7

Q A 50 r ST LAG RUNF 0 902 0 939 0 441 1 068 49 7 5 1 ( )

. . . . = . ( ) ( + ) ( + ) ( ) − −

Equation 7

Q50 r

0 902 0 939 0 441 49 7 57 3 4 97 5 1 063 1 21 29 ( ). . . = . ( . ) ( . + ) ( . ) + ( . ) − − 1.068

Equation 8

Q50 r

0 902 0 939 0 441 49 7 57 3 4 97 5 1 063 1 21 29 ( ). . . = . ( . ) ( . + ) ( . ) + ( . ) − − 1.068

Equation 8

Q Q N Q E

N E W

g r

50

50 50

( )

( )( ) ( )( ) = +

+

Equation 9

Q Q N Q E

N E W

g r

50

50 50

( )

( )( ) ( )( ) = +

+

Equation 9

= +

+

( , )( ) ( , )( . )

.

3 600 30 4 210 15 8

30 15 8

Equation 10

= +

+

( , )( ) ( , )( . )

.

3 600 30 4 210 15 8

30 15 8

Equation 10

Magnitude and Frequency of Flood Discharges 37
Example 2. Ungaged site whose drainage area extends into an adjacent hydrologic region or State: Compute the 50-year peakdischarge regression estimate for Genesee River at Rochester (04232000). For this example, assume this site is ungaged and is 

under pre-regulation conditions.

Given:

Drainage area (A) at the site is 2,467 mi2, and the site is in hydrologic Region 6 (fig. 2);

The upper 53.5 percent (1,321 mi2) of the basin is in hydrologic Region 5;

Main channel slope (SL) = 8.05 ft/mi (table 10);

Mean annual precipitation = 33.92 in (table 10);

Area of lake, ponds, and wetlands [storage (ST)] = 1.08 percent (table 10);

Mean annual runoff (RUNF) = 14.64 in (table 10);

Percentage of the basin above 1,200 ft mean sea level (EL12) = 58.8 percent (table 10);

Slope ratio (SR) = Main channel slope (SL)

 Average basin slope (BS)

= 8.05 ft/mi (table 10)

 432.25 ft/mi (table 10) 

= 0.019 (also in table 10).

Solution:

Percentage of total drainage area within hydrologic Region 5 is 53.5 percent, and percentage of total drainage area within 

hydrologic Region 6 is 46.5 percent. These are the weighting factors to be applied after the 50-year peak-discharges for the site 

have been computed through regression equations for regions 5 and 6 (table 1):

 = 105,700 ft3/s;

= 50,270 ft3/s.

To compute a final 50-year regression estimate at this station, apply the two drainage-area percentages as weighting factors:

 

The Genesee River station at Rochester (04232000) is currently regulated, and the above information represents preregulation conditions. This example is for illustration purposes only and is not applicable to present conditions at this station.

a)

b)

c)

d)

e)

f)

g)

h)

Q50 r A SL P 0 976 0 610 0 651 1 46 ( )

. . . (Region 5)= . ( ) ( ) ( )

Equation 14

Q50 r A SL P 0 976 0 610 0 651 1 46 ( )

. . . (Region 5)= . ( ) ( ) ( )

Equation 14

=1 46 2 467 8 05 33 92 0 976 0 610 0 651 . ( , ) ( . ) ( . ) . . .

Equation 16

=1 46 2 467 8 05 33 92 0 976 0 610 0 651 . ( , ) ( . ) ( . ) . . .

Equation 16

Q50 r A ST RUNF EL 0 819 0 188 0 528 39 0 0 5 1 ( )

. . . (Region 6)= . ( ) ( + . ) ( ) ( − 2 1 0 157 0 305 + ) ( ) . . SR

Equation 17

Q50 r A ST RUNF EL 0 819 0 188 0 528 39 0 0 5 1 ( )

. . . (Region 6)= . ( ) ( + . ) ( ) ( − 2 1 0 157 0 305 + ) ( ) . . SR

Equation 17

= 39 0 2 467 1 08 0 + 5 14 64 58 8 +1 0 819 0 188 0 528 0 157 . ( , ) ( . . ) ( . ) ( . ) . - . . . ( . ) . 0 019 0 305

Equation 18

= 39 0 2 467 1 08 0 + 5 14 64 58 8 +1 0 819 0 188 0 528 0 157 . ( , ) ( . . ) ( . ) ( . ) . - . . . ( . ) . 0 019 0 305

Equation 18

Q50 r 105 700 0 535 50 270 0 465 79 900 ( ) = ( , )( . ) + ( , )( . ) = , ft /s 3

Equation 19

Q50 r 105 700 0 535 50 270 0 465 79 900 ( ) = ( , )( . ) + ( , )( . ) = , ft /s 3

Equation 19

38 Magnitude and Frequency of Floods in New York
Example 3. Ungaged site near a gage site on the same stream. Estimate the 50-year peak-discharge at the ungaged site Normans 

Kill near Westmere. This example is for illustration purposes only since Normans Kill near Westmere was previously a 

streamflow-gaging station (01359519).

Given:

This drainage basin is in hydrologic Region 2, upstream from the gaged site of Normans Kill at Albany [station 

01359528, drainage area (Ag) = 168 mi2];

Drainage area (Au) of ungaged site Normans Kill near Westmere = 131 mi2;

Area of lakes, ponds, and wetlands [storage (ST)] = 2.39 percent of basin;

Basin lag factor (LAG) = 1.073;

Mean annual runoff (RUNF) = 17.57 in.

Solution:

The drainage area of this ungaged site (131 mi2) meets the criterion of between 50 and 150 percent of the drainage area at 

the gaged site (168 mi2). Therefore, method 3 (for an ungaged site near a gaged site on the same stream) can be used.

The 50-year regression estimate (Q50(u)r) for this ungaged site (Normans Kill near Westmere) is:

 

 = 9,560 ft3/s.

The 50-year weighted peak discharge at the gaged site (Normans at Albany) is:

Q50(G)w = 12,800 ft3/s (table 8).

The estimate of the 50-year peak-discharge at the ungaged site near Westmere derived from the weighted estimate for the 

gaged site (at Albany) based on the drainage-area difference, is:

 b is the exponent from the Region 2 drainage-area-only equations (table 3) 

 = 10,800 ft3/s.

The weighted estimate of the Q50 peak discharge at the ungaged site near Westmere is:

 = 10,300 ft3/s.

a)

b)

c)

d)

e)

∆A A = = g u - - A 168 131 = 37 2 mi

Equation 20

∆A A = = g u - - A 168 131 = 37 2 mi

Equation 20

Q50( ) u r = 49.7 ( ) A ( + ST 5) ( + LAG R 1) ( ) UNF 0.902 -0.939 -0.441 1.068 (table 1, hydrologic Region 2)

Equation 21

Q50( ) u r = 49.7 ( ) A ( + ST 5) ( + LAG R 1) ( ) UNF 0.902 -0.939 -0.441 1.068 (table 1, hydrologic Region 2)

Equation 21

= 49 7 131 2 39 5 + 1 073+1 17 57 0 902 0 939 0 441 1 068 . ( ) ( . ) ( . ) ( . ) . - . - . .

Equation 22

= 49 7 131 2 39 5 + 1 073+1 17 57 0 902 0 939 0 441 1 068 . ( ) ( . ) ( . ) ( . ) . - . - . .

Equation 22

Q A U g u g A Qb

50( ) 50( ) G w = ( ) ( )

Equation 23

Q A U g u g A Qb

50( ) 50( ) G w = ( ) ( )

Equation 23

ft /s 3 Q50 U g

0 666 131 168 12 800 ( ). = ( ) ( , )

Equation 24

ft /s 3 Q50 U g

0 666 131 168 12 800 ( ). = ( ) ( , )

Equation 24

Q A

A Q AA U w Q

g

U r

g

50 50 50 U g

2 1 2

( ) ( ) ( ) = ( ) + − 















∆ ∆ Q A

A Q AA U w Q

g

U r

g

50 50 50 U g

2 1 2

( ) ( ) ( ) = ( ) + − 















∆ ∆

= + − 



 



( ) 2 37

168

9 560 1 2 37

168

10 800 ( ) ( , ) ( ) = + − , 



 



( ) 2 37

168

9 560 1 2 37

168

10 800 ( ) ( , ) ( ) ,

Magnitude and Frequency of Flood Discharges 39
Example 4. Ungaged site on a gaged stream, located between two streamflow-gaging stations. Estimate the 50-year peak 

discharge at the ungaged site Susquehanna River at Windsor. The example is for illustration purposes only because Susquehanna 

River at Windsor (01502731) is an active USGS streamflow-gaging station.

Given:

The drainage basin for this site is in hydrologic Region 4, between the gaged sites of Susquehanna River at Afton 

(01502701) and Susquehanna River at Conklin (01503000);

The drainage areas are:

Afton (01502701) = 1,716 mi2 (Ag1),

Windsor (01502731) = 1,820 mi2 (Au),

Conklin (01503000) = 2,232 mi2 (Ag2);

Areas of lakes, ponds, and wetlands [storage (ST)] = 2.09 percent of basin;

Mean annual runoff (RUNF) = 21.59 in.;

Slope ratio (SR) = SL / BS = (4.08 ft/mi) / (648 ft/mi) = 0.006.

Solution:

The weighted 50-year peak-discharge estimate for the ungaged site (at Windsor), computed from the Afton gage data and 

the method shown in example 3:

= 51,800 ft3/s (Q50(u1)w) .

The weighted 50-year peak-discharge estimate for the ungaged site (at Windsor), computed from the Conklin gage data and 

the method shown in example 3, is:

 = 50,400 ft3/s (Q50(u2)w) .

The final weighted 50-year peak-discharge estimate for the ungaged site (at Windsor) is computed as:

 

= 51,500 ft3/s.

The weighted 50-year peak-discharge estimate computed for each of the 388 gaging stations (table 8) were used to develop 

average, maximum, and minimum flood-frequency curves for each of the six hydrologic regions, and for New York (all sites 

including gages in adjacent States). The average flood-frequency curves for each hydrologic region, and for all sites combined, 

are shown in figure 20. The highest average peak-discharge runoff rates in cubic feet per second per square mile, for each 

recurrence interval are in hydrologic Region 3 (Catskill Mountains area), and the lowest are in Region 6 (Central Lowlands

south of Lake Ontario).

The highest peak-discharge runoff rates (for recurrence intervals greater than 10 years) in the entire study area, in cubic 

feet per second per square mile, are those in hydrologic Region 2 (fig. 21), and the lowest (for all recurrence intervals) are in 

hydrologic Region 6.

a)

b)

c)

d)

e)

Q Q Uf w U w g A Au U Q A w u A A g g Ag 50( ) = 50( ) 1 2 ( ) − + − 50( ) 2 ( ) 1 2 1 

  Q Q Uf w U w g A Au U Q A w u A A g g − Ag 50( ) = 50( ) 1 2 ( ) − + − 50( ) 2 ( ) 1 2 1   −

= [( , 51 800)(2, , 232 −1 820) ( + 50, ) 400 ( , 1 820 −1, ) 716 ] ( , 2 232 −1,716)

Equation 30

= [( , 51 800)(2, , 232 −1 820) ( + 50, ) 400 ( , 1 820 −1, ) 716 ] ( , 2 232 −1,716)

Equation 30

40 Magnitude and Frequency of Floods in New York
Limitations, Accuracy, and Sensitivity 

of Regression Equations

The regression equations developed in this study apply 

to streams in areas of New York where peak discharge is not 

greatly affected by stream regulation (flood-control reservoir) 

or by diversion or other manmade changes. The equations 

are not applicable to basins in urban areas (in which more 

than 15 percent of the basin is urbanized) unless the effects of 

urbanization on high flow are insignificant. Channelization, 

channel structures or constrictions, and large withdrawals 

from the stream may alter peak discharges and cause them 

to differ from those expected under undisturbed conditions. 

If the effects of urbanization can be quantified, adjustments 

to the rural peak-discharge estimates can be made through 

procedures outlined by Sauer and others (1983) to estimate 

peak discharge for urban areas. Lumia (1984) developed 

peak-discharge profiles for several streams in Rockland 

County, including many urbanized basins.

The relation between peak discharge and basin 

characteristics (actually the logarithms of these variables) 

given by the multiple linear regression equation is assumed 

to be linear only within the range of characteristics that 

define that relation. The suitability of the regional equations 

is undefined for streams having values beyond the ranges 

used, and extrapolation requires extreme caution or may be 

infeasible. The ranges of all basin characteristics used in the 

regression analyses for each region are given in table 4.

Flood-frequency analyses assume the gaged record to be 

representative of long-term conditions; sampling error results 

from limitations on the number of years of gaged record 

available and from hydrologic conditions during the particular 

period sampled. The use of GLS regression equations 

minimizes, but does not prevent, this type of error.

The standard error of prediction is an index of the 

expected accuracy of the regression estimates. If all 

assumptions for applying regression are met, the discrepancy 

between the regression estimate and actual discharge will be 

within 1 standard error about 68 percent of the time.

Values for the basin characteristics used in the regression 

equations are computed or estimated from GIS procedures 

and datasets and, therefore, may be subject to some error in 

measurement and judgment. Sensitivity tests were conducted 

on the 50-year peak-discharge regression equation for each 

hydrologic region to estimate how much variability may be 

introduced by error in computing the basin-characteristic 

values. Results (table 5) should be indicative of the relative 

magnitude of the sensitivities of the equations for other 

frequencies. The data presented in table 5 were obtained 

through a process whereby the value of only one basin 

characteristic at a time was varied while all others were held 

constant. Each characteristic was increased 10, 20, and 30 

percent, then decreased 10, 20, and 30 percent; the percent 

10

20

30

40

50

60

80

100

200

300

400

Region 1 (108 sites)

Region 2 ( 63 sites)

Region 3 ( 39 sites)

Region 4 ( 49 sites)

Region 5 ( 80 sites)

Region 6 ( 49 sites)

New York & adjacent States (388 sites)

1.11 1.25 1.5 2.0 5.0 10 20 50 100 200 500

RECURRENCE INTERVAL, IN YEARS

PEAK DISCHARGE, IN CUBIC FEET PER SECOND PER SQUARE MILE

Figure 20. Average flood-frequency curves for six hydrologic regions of New York and for all 388 study sites combined (Region

boundaries are shown in figure 2).

Limitations, Accuracy, and Sensitivity of Regression Equations 41
Figure 21.  Maximum, minimum, and average flood-frequency curves for six hydrologic regions of New York and for all 388 study

sites combined (Region boundaries are shown in figure 2).

1

2

5

10

20

50

100

200

500

1,000

1,500

1

2

5

10

20

50

100

200

500

1,000

1,500

1

2

5

10

20

50

100

200

500

1,000

1,500

REGION 1 (108 SITES) REGION 2 (63 SITES)

REGION 3 (39 SITES)

1.11 1.25 1.5 2.0 5.0 10 20 50 100 200 500

RECURRENCE INTERVAL, IN YEARS

PEACK DISCHARGE, IN CUBIC FEET PER SECOND PER SQUARE MILE

1

2

5

10

20

50

100

200

500

1,000

1,500

Maximum

Average

Minimum

Maximum

Average

Minimum

EXPLANATION

1

2

5

10

20

50

100

200

500

1,000

1,500

1

2

5

10

20

50

100

200

500

1,000

1,500

REGION 4 (49 SITES)

REGION 5 (80 SITES) REGION 6 (49 SITES)

NEW YORK DATA REPRESENT 388 SITES WITHIN

AND ADJACENT TO NEW YORK

1.11 1.25 1.5 2.0 5.0 10 20 50 100 200 500

RECURRENCE INTERVAL, IN YEARS

Region flood frequency

New York flood frequency

42 Magnitude and Frequency of Floods in New York
Table 4.  Minimum, maximum, and median values for basin characteristics used in the regression analyses for six hydrologic regions in New York, excluding Long Island.

[Hydrologic-region boundaries are delineated in figure 2. Min, minimum; max, maximum] 

Basin

characteristic *

Region 1 (108 sites) Region 2 (63 sites) Region 3 (39 sites) Region 4 (49 sites) Region 5 (80 sites) Region 6 (49 sites)

Min Max Median Min Max Median Min Max Median Min Max Median Min Max Median Min Max Median

A 0.54 4500.00 48.50 1.93 996.00 60.60 0.41 3480.00 40.80 0.61 3941.00 82.30 1.70 4773.00 77.20 0.58 2467.00 31.00L 1.29 159.96 18.59 3.40 95.06 18.64 1.06 174.38 14.63 1.54 155.90 22.62 2.18 189.96 19.73 1.16 165.26 13.81SL 3.79 662.27 38.19 7.23 251.74 33.34 6.71 729.47 61.57 3.73 285.97 26.72 2.76 222.55 35.17 4.86 146.00 21.80SL_LO 0.00 408.66 27.07 2.50 244.18 20.34 1.16 591.95 42.16 2.19 302.36 10.61 0.72 317.79 21.84 1.60 252.96 16.40SL_UP 3.94 1093.58 61.68 3.62 445.27 49.31 7.48 1135.57 85.49 5.41 355.83 51.67 4.25 294.50 55.75 2.81 124.78 38.22BS 69.23 1647.27 466.49 384.28 1720.11 642.03 283.56 1596.58 1052.62 357.81 1070.51 646.11 117.51 1457.15 637.46 62.69 589.72 292.39SR 0.005 0.772 0.080 0.013 0.328 0.055 0.006 0.637 0.058 0.006 0.438 0.039 0.004 0.553 0.060 0.019 0.698 0.099LAG 0.004 15.229 0.479 0.014 6.997 0.474 0.002 20.582 0.259 0.006 34.493 0.883 0.013 48.309 0.486 0.020 33.442 0.494EL12 0.00 100.00 58.49 0.00 99.97 6.63 48.92 100.00 100.00 83.95 100.00 96.26 0.00 100.00 96.02 0.00 100.00 0.00ST 0.00 28.92 5.16 0.00 11.88 3.99 0.00 3.73 0.47 0.00 7.75 1.28 0.00 6.24 0.45 0.00 5.98 1.08FOR 23.83 99.61 80.29 48.45 99.42 74.58 49.00 100.00 91.10 29.78 99.93 0.59 38.46 99.38 62.91 8.99 61.05 36.41RUNF 11.35 37.84 23.40 16.03 33.95 23.05 16.86 40.73 27.49 19.84 26.09 22.69 12.29 30.66 18.57 9.49 22.77 14.22P 29.49 56.10 41.16 36.06 52.43 44.77 36.82 59.99 46.75 38.69 44.95 41.53 31.64 49.79 37.50 29.50 41.83 33.92MXSNO 14.90 28.64 21.30 9.74 20.02 15.07 13.02 20.42 16.58 13.54 18.51 16.38 11.27 20.40 12.91 12.02 19.24 14.73

* A—Drainage area, in square miles. Area of basin upstream from gaging station or site of interest.

L—Main-channel stream length, in miles. Longest distance from streamflow-gaging station or site of interest to top of basin.SL—Main-channel slope, in feet per mile. The difference in elevation (feet) between points 10 percent and 85 percent of distance along main stream channel, from the gage or site of interest to top of basin, divided by distance (miles) between the two points.SL_LO—Slope of lower half of main channel, in feet per mile. The difference in elevation (feet) between points 10 percent and 85 percent of distance along the lower half of main channel from gage or point of interest to midpoint of entire main channel, divided by the distance (miles) between the two points.SL_UP—Slope of upper half of the main channel, in feet per mile. The difference in elevation (feet) between points 10 percent and 85 percent of distance alongthe upper half of main channel from midpoint of the entire main channel to the top of the basin, divided by distance (miles) between the two points.BS—Average basin slope, in feet per mile, measured by “contour-band” method within contributing drainage area and equal to [(total length of all selected elevation contours) (contour interval)] / A . SR—Slope ratio of main-channel slope to basin slope within the drainage basin, computed as SL / BS . LAG—Basin lag factor, calculated as L / [( SL_UP + 1) ( SL_LO + 1)] 0.5 .EL12—Percentage of drainage basin at or greater than 1,200 feet above sea level. ST—Basin storage, percentage of total drainage area shown as lakes, ponds, and swamps (wetlands) as interpreted from National Land Cover Dataset (NLCD) land-use data (U.S. Geological Survey, 2000).FOR—Basin forested area. Percentage of total drainage area shown as forest cover, as interpreted from the NLCD land-use data (U.S. Geological Survey, 2000).RUNF—Mean annual runoff, in inches (from Randall, 1996). P —Mean annual precipitation, in inches (from Randall, 1996).MXSNO—Seasonal maximum snow depth (50th percentile), in inches, as interpreted from Northeast Regional Climate Center (Cornell Atlas of Snowfall and Snow Depth (Cember and Wilks, 1993)

Limitations, Accuracy, and Sensitivity of Regression Equations 43
Table 5.  Results of sensitivity analysis--percent change in computed 50-year peak discharges as a result of ± 30-percent change in selected variables within each of six

hydrologic regions of New York, excluding Long Island.[Region boundaries are delineated in figure 2]

Explanatory 

variable*

Percent increase or decrease in variable 

+30 +20 +10 0 -10 -20 -30

Region 1A 28.7 19.2 9.6 0.0 -9.6 -19.3 -29.1ST (low) -0.1 -0.0 -0.0 0.0 0.0 0.0 0.1ST (high) -4.9 -3.4 -1.8 0.0 2.0 4.3 7.0P 34.5 22.9 11.4 0.0 -11.2 -22.3 -33.2LAG (low) -0.1 -0.0 -0.0 0.0 0.0 0.0 0.1LAG (high) -11.9 -8.4 -4.5 0.0 5.2 11.2 18.4FOR (low) -10.2 -7.0 -3.6 0.0 3.8 7.9 12.2FOR (high) -21.9 -15.6 -8.3 0.0 9.6 20.8 34.0Region 2A 26.7 17.9 9.0 0.0 -9.1 -18. -27.5ST (low) -0.1 0.0 0.0 0.0 0.0 0.0 0.1ST (high) -16.5 -11.6 -6.2 0.0 7.1 15.3 25.0LAG (low) -0.2 -0.1 -0.1 0.0 0.1 0.1 0.2LAG (high) -9.8 -6.9 -3.6 0.0 4.1 8.9 14.4RUNF 32.3 21.5 10.7 0.0 -10.6 -21.2 -31.7Region 3A 28.4 19.0 9.5 0.0 -9.6 -19.2 -28.8LAG (low) 0.0 0.0 0.0 0.0 0.0 0.0 0.0LAG (high) -6.0 -4.2 -2.2 0.0 2.5 5.3 8.6RUNF 11.9 8.2 4.2 0.0 -4.4 -9.1 -14.2MXSNO 77.9 49.2 23.3 0.0 -20.6 -38.7 54.3

Explanatory 

variable*

Percent increase or decrease in variable 

+30 +20 +10 0 -10 -20 -30

Region 4A 28.7 19.2 9.6 0.0 -9.6 -19.3 -29.1ST (low) -0.2 -0.1 -0.1 0.0 0.1 0.1 0.2ST (high) -6.5 -4.5 -2.4 0.0 2.7 5.8 9.3RUNF 45.7 29.8 14.6 0.0 -13.9 -27.1 -39.6SR 8.5 5.9 3.0 0.0 -3.2 -6.7 -10.5Region 5A 29.2 19.5 9.7 0.0 -9.8 -19.6 -29.4SL 17.4 11.8 6.0 0.0 -6.2 -12.7 -19.6P 18.6 12.6 6.4 0.0 -6.6 -13.5 -20.7Region 6A 24.0 16.1 8.1 0.0 -8.3 -16.7 -25.3ST (low) -0.1 -0.1 0.0 0.0 0.0 0.1 0.1ST (high) -4.5 -3.1 -1.6 0.0 1.8 3.9 6.3RUNF 14.9 10.1 5.2 0.0 -5.4 -11.1 -17.2EL12 (low) 2.2 1.5 0.8 0.0 -0.8 -1.6 -2.5EL12 (high) 4.2 2.9 1.5 0.0 -1.6 -3.4 -5.4SR 8.3 5.7 2.9 0.0 -3.2 -6.6 -10.3

* A—Drainage area, in square miles. Area of basin upstream from gaging station or site of interest.

ST—Basin storage. Percentage of total drainage area shown as lakes, ponds, and swamps (wetlands) as interpreted from national Land Use Cover Dataset (NLCD) land-use data (U.S. Geological Survey, 

2000).

P—Mean annual precipitation, in inches, (from Randall 1996).LAG—Basin lag factor. Calculated as L / [( SL_UP + 1) ( SL_LO + 1)] 0.5FOR—Basin forested area. Percentage of total drainage area shown as forest cover as interpreted from NLCD land-use data (U.S. Geological Survey, 2000).RUNF—Mean annual runoff, in inches (from Randall, 1996). MXSNO—Seasonal maximum snow depth (50th percentile), in inches, as interpreted from Northeast Regional Climate Center (Cornell Atlas of Snowfall and Snow Depth (Cember and Wilks, 1993).SR—Slope ratio. Ratio of main-channel slope to basin slope within the drainage basin, computed as SL / BS. SL—Main-channel slope, in feet per mile. Difference in elevation (feet) between points 10 percent and 85 percent of distance along main stream channel, from gage or site of interest to top of basin, divided 

by distance (miles) between the two points.

EL12—Percentage of drainage basin at or greater than 1,200 feet above sea level.

44 Magnitude and Frequency of Floods in New York
changes in the computed peak discharge are given in table 5. 

A test of variables for which no constant was added or 

subtracted (for example, drainage area), was done in which 

the regional mean value of each variable was used to compute 

a “base” 50-year peak discharge. The variable being tested 

was then changed by the above percentages, and the resulting 

percent changes in 50-year peak discharge were tabulated. A 

regional low and high value was used to compute a “base” 

50-year peak discharge for variables to which constants 

were added or subtracted, such as forest cover (FOR) and 

storage (ST), because errors in computed discharges will 

be affected differently depending on the magnitude of the 

basin characteristic being tested. The variable to which peak 

discharges were most sensitive was maximum snow depth 

(applicable to Region 3); other factors to which peak discharge 

was sensitive were mean annual precipitation (Region 1), 

mean annual runoff (Regions 2 ,3, 4, and 6), and drainage area 

(all regions) (table 5).

 Use of the flood-frequency equations presented 

herein requires use of the basin-characteristic datasets 

developed for these analyses. The use of different or updated 

characteristics may add uncertainty to the resulting floodfrequency estimates.

Suggestions for Further Study

Standard errors of the regional equations presented 

in this study are similar to those obtained from equations 

published by Lumia (1991) or may be smaller because (1) 

several small-streamflow-gaging stations have been added to 

the network, (2) methods of defining basin characteristics have 

been refined, (3) records of annual peak discharges have been 

extended by several years, and (4) analytical procedures have 

improved. Additional research on several factors related to 

flood-frequency relations, discussed in the next sections, could 

further decrease errors in future analyses.

Skewness Coefficient

Weighting the skewness coefficient computed from 

station records with a generalized skewness coefficient 

decreases possible bias caused by the relatively short periods 

of record of some stations. A weighting technique based on 

the number of years of record at each of 226 sites in New York 

was used to develop a statewide contour map of unbiased, 

generalized skew coefficients (Lumia and Baevsky, 2000). 

An error analysis showed the statewide map to have a lower 

mean-square-error (MSE) than the previously used nationwide 

map (Interagency Advisory Committee on Water Data, 1982). 

The statewide map was used to assign generalized skew 

values to each of the 388 sites used in this study and it can be 

updated and refined for future updates of the New York floodfrequency relations. Until then, the statewide map can be used 

to provide generalized skew values. Standard errors of the 

generalized skews for each of the six hydrologic regions are 

given in table 6.

Soil Maps

Soil data were originally included in the regression 

analysis for this study. The soil values were computed from 

the 1:250,000-scale State Soil Geographic (STATSGO) 

data (National Resources Conservation Service, 1991; 

U.S. Geological Survey, 1997) and are based on generalized 

soils maps. The soil variables showed promise in improving 

the variability in some of the regional regression analyses but 

were not used in the final regression analyses because they 

were originally derived for use only in studies of multistate or 

national scale.

Future use of detailed soil maps, if available, might 

greatly increase the accuracy and predictive ability of the 

flood-frequency relations for the basins of the scale used in 

this study.

Table 6.  Selected statistics for skew coefficients for each of six hydrologic regions of New York, excluding

Long Island.

[Region boundaries are depicted in figure 2]

Hydrologic 

region

Number of stations 

with at least 

20 years of record

Station statistics (log base 10 units)

Average 

unbiased

station skew

Average 

statewide 

map skew

Mean square 

error

Standard

error

1 60 0.173 0.212 0.160 0.400

2 and 3 65 .361 .410 .205 .453

4 34 -.092 -.042 .103 .321

5 48 .172 .288 .213 .462

6 19 -.199 -.118 .200 .447

All regions 226 .156 .219 .179 .423

Suggestions for Further Study 45
Small-Stream Data

Historical flood data from small streams with short 

periods of record could improve the current flood-frequency 

relations but are generally unavailable. Such information, 

if located within sources such as flood-insurance studies, 

government agencies, public libraries, or engineering records, 

might be best compiled in a format similar to that used by 

Lumia and Murray (1993).

Expansion of the current annual peak-discharge 

gaging-station network to include additional small streams, 

particularly sites with drainage areas less than 1.0 mi2, could 

improve the accuracy of computed peak discharges for these 

sites. Supplementing the peak-discharge data base for small 

streams with data from a rainfall-runoff data network with 

subsequent modeling could also increase the accuracy and 

predictive ability of the flood-frequency relations.

Other Factors

Study of several other factors that affect peak discharges 

could potentially improve the flood-frequency relations for 

streams in New York. These factors include (1) the effect of 

mixed populations in annual peak-discharge data analysis 

(for example, floods caused by thunderstorms combined 

with floods from snowmelt or hurricanes); (2) the effects of 

incorporating additional basin characteristics in the regression 

analyses to account for unexplained variability in peak 

discharges; (3) the effect of regulation, with development 

of criteria for selecting or rejecting peak-discharge records 

on the basis of storage effects; (4) the effect of urbanization 

on flood frequencies; and (5) the effects of using detailed 

wetland maps.

Summary

This report presents the results of a cooperative study 

with the New York State Department of Transportation to 

derive regional regression equations from generalized leastsquares regression analysis for calculating the magnitude and 

frequency of floods on rural, unregulated streams in New 

York, excluding Long Island. Procedures for estimating peak 

discharges with 10 recurrence intervals (1.25, 1.5, 2, 5, 10, 

25, 50, 100, 200, and 500 years) for each of 6 hydrologic 

regions of New York are given. The procedures depend on 

whether the site in question is gaged or ungaged, and whether 

the basin extends into an adjacent hydrologic region or State. 

The estimated standard error of prediction for the regression 

equations ranged from 14 to 43 percent. The data and final 

estimates of peak discharges for 10 recurrence intervals at 

the 388 gaging stations used for the analyses are summarized 

in tables and graphs. Four examples of peak-discharge 

computations are provided. The limitations and accuracy of 

the estimating equations and the relative importance of the 

significant variables (sensitivity analysis) are given in several 

tables. Maximum snow depth, mean annual precipitation, 

mean annual runoff, and drainage area are shown to be the 

most sensitive variables.

Suggestions for additional study include development of 

a detailed soils map for New York. Alternative peak-discharge 

estimating equations, based on drainage area only, are 

included. These equation provide estimates of peak discharges 

that are easier to compute, but less accurate, than those 

calculated through the full-regression equations.

 A DVD (in the pocket at the back of the report) contains 

procedures and GIS datasets for computation of basin 

characteristics needed for the flood-frequency regression 

equations. Procedures are also included for the computation 

of peak-discharges for 10 recurrence intervals at any stream 

location in New York where the regression equations are 

applicable. A spreadsheet is also included on the DVD for 

computation of peak discharges at ungaged sites, gaged 

sites, and ungaged sites on gaged streams for each of the six 

hydrologic regions.

Acknowledgments

The New York State Department of Transportation, the 

New York State Department of Environmental Conservation, 

the U.S. Army Corps of Engineers, the Hudson River 

–Black River Regulating District, the New York Power 

Authority, Reliant Energy, the New York City Department of 

Environmental Protection, and several other municipal and 

county governments provided support for data-collection 

programs. The authors also acknowledge the USGS 

personnel who collected and analyzed data for this report, 

and Elizabeth Ahearn and Scott Olson of the USGS for 

valuable technical reviews.

Selected References

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flows for the 2-, 10-, 25-, 50-, 100-, and 500-year recurrence 

intervals in Connecticut: U.S. Geological Survey Scientific 

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floods in a humid region of diverse terrain: U.S. Geological 

Survey Water-Supply Paper 1580–B, 64 p.

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of snowfall and snow depth for the northeastern United 

States and southeastern Canada: Publication no. RR 93–1, 

Northeast Regional Climate Center, Cornell University, 

Ithaca, NY, 18 p.

Darmer, K.I., 1970, A proposed streamflow data program for 

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46 Magnitude and Frequency of Floods in New York
Environmental Systems Research Institute, Inc. (ESRI), 1994, 

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p. 16–28.

Hardison, C.H., 1971, Prediction error of regression estimates 

of streamflow characteristics at ungaged streams, in

Geological Survey Research 1971: U.S. Geological Survey 

Professional Paper 750–C, p. C228–C236.

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instructions, and verification for Basinsoft, a computer 

program to quantify drainage-basin characteristics: U.S. 

Geological Survey Water-Resources Investigations Report 

95-4287, 25 p.

Helsel, D.R., and Hirsch, R.M., 1992, Statistical methods in 

water resources: New York, Elsevier, 522 p.

Hodgkins, G., 1999, Estimating the magnitude of peak flows 

for streams in Maine for selected recurrence intervals: U.S. 

Geological Survey Water-Resources Investigations Report 

99-4008, 45 p.

Interagency Advisory Committee on Water Data, 1982, 

Guidelines for determining flood flow frequency—Bulletin 

17B of the Hydrology Subcommittee: U.S. Geological 

Survey, Office of Water-Data Coordination, 183 p.

Jennings, M.E., Thomas, W.O., and Riggs, H.C., comps., 

1994, Nationwide summary of U.S. Geological Survey 

regional regression equations for estimating magnitude 

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94-4002, 196 p.

Kirby, William, 1981, Annual flood-frequency analysis 

using U.S. Water Resources Council guidelines (Program 

J407): U.S. Geological Survey National Water Storage and 

Retrieval System, v. 4, chap. I, section C, 57 p.

Lumia, Richard, 1984, Flood-discharge profiles of 

selected streams in Rockland County, New York: U.S. 

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84-4049, 32 p.

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Investigations Report 90-4197, 119 p.

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annual peak discharges of rural, unregulated streams in 

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streams: U.S. Geological Survey Water Resources 

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evapotranspiration in the glaciated northeastern United 

States, 1951–80: U.S. Geological Survey Open-File Report 

96-395, 2 pls.

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of selected streams in Kansas: U.S. Geological Survey 

Water-Resources Investigations Report 01-4203, 62 p.

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Flood Frequency Program, Version 3: A computer 

program for estimating magnitude and frequency of floods 

for ungaged sites, 2002: U.S. Geological Survey Water 

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Robison, L.F., 1961, Floods in New York—magnitude and 

frequency: U.S. Geological Survey Circular 454, 10 p.

SAS [Statistical Analysis System] Institute, Inc., 1982, SAS 

user’s guide—statistics, 1982 ed.: Cary, NC, 584 p.

Sauer, V.B., Thomas, W.O., Jr., Stricker, V.A., and Wilson, 

K.V., 1983, Flood characteristics of urban watersheds in the 

United States: U.S. Geological Survey Water-Supply Paper 

2207, 63 p.

Speer, P.R., and Gamble, C.R., 1965, Magnitude and 

frequency of floods in the United States, Part 3–A, Ohio 

River basin except Cumberland and Tennessee River basins: 

U.S. Geological Survey Water-Supply Paper 1675, 630 p.

Stankowski, S.J., 1974, Magnitude and frequency of floods 

in New Jersey, with effects of urbanization: New Jersey 

Department of Environmental Protection-Division of Water 

Resources, Special Report 38, 46 p.

Selected References 47
Stedfast, D.A., 1986, Evaluation of six methods for estimating 

magnitude and frequency of peak discharges of urban 

streams in New York: U.S. Geological Survey Water 

Resources Investigations Report 84-4350, 24 p.

Stedinger, J.R., and Tasker, G.D., 1985, Regional hydrologic 

analysis 1, ordinary, weighted, and generalized least 

squares compared: Water Resources Research, v. 21, no. 9, 

p. 1421–1432.

Stuckey, M.H., and Reed, L.A., 2000, Techniques for 

estimating magnitude and frequency of peak flows for 

Pennsylvania streams: U.S. Geological Survey Water 

Resources Investigations Report 2000-4189, 43 p.

Tasker, G.D., 1982, Simplified testing of hydrologic regression 

regions: American Society of Civil Engineers, Journal of 

Hydraulics Division, v. 108, no HY10, p. 1218–1222.

Tasker, G.D., and Stedinger, J.R., 1989, An operational GLS 

model for hydrologic regression: Journal of Hydrology, 

v. 111, p. 361–375.

Tice, R.H., 1968, Magnitude and frequency of floods in the 

United States, part 1–B, North Atlantic Slope basins, New 

York to York River: U.S. Geological Survey Water-Supply 

Paper 1672, 585 p.

U.S. Geological Survey, 1997, STATSGO, Soil characteristics 

for the conterminous United States: U.S. Geological Survey 

Open-File Report 656, accessed at URL http://water.usgs.

gov/GIS/metadata/usgswrd/muid.html.

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U.S. Geological Survey, 2001, National Elevation Dataset: 

U.S. Geological Survey, accessed at http://gisdata.usgs.

gov/NED/.

U.S. Water Resources Council, 1981, Guidelines 

for determining floodflow frequency: Hydrology 

Subcommittee Bulletin 17B, 28 p., appendix.

Wagner, L.A., 1982, Drainage areas of New York streams, by 

river basins—a stream gazetteer, Part 1, data compiled as of 

October 1980: U.S. Geological Survey Open-File Report 

81-1055, 359 p.

Wandle, W.S., Jr., 1977, Estimating the magnitude 

and frequency of floods on natural-flow streams in 

Massachusetts: U.S. Geological Survey Water Resources 

Investigations Report 77-39, 26 p.

Wandle, W.S., Jr., 1983, Estimating peak discharges of small, 

rural streams in Massachusetts: U.S. Geological Survey 

Water-Supply Paper 2214, 26 p.

Wiitala, S.W., 1965, Magnitude and frequency of floods in 

the United States, Part 4, St. Lawrence River basin: U.S. 

Geological Survey Water-Supply Paper 1677, 357 p.

Zembrzuski, T.J., Jr., and Dunn, Bernard, 1979, Techniques 

for estimating magnitude and frequency of floods on 

rural, unregulated streams in New York State excluding 

Long Island: U.S. Geological Survey Water Resources 

Investigations Report 79-83, 66 p.

48 Magnitude and Frequency of Floods in New York
Tables 7–10

Tables 7–10 49
* Water year is defined as October 1 through September 30. For example, October 1, 1980 through September 30, 1981 is the 1981 water year. 

Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excludingLong Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

1 01197500 Housatonic River near Great 

Barrington MA

Berkshire, MA

282.00 2 421355 732119 1914-99 01-01-49 12,200 43.3 100

2 01199000 Housatonic River at Falls Village CT Litchfield, 

CT

634.00 2 415726 732211 1913-99 01-01-49 23,900 37.7 >100

3 01199050 Salmon Creek at Lime Rock CT Litchfield, 

CT

29.40 2 415632 732329 1955,62-99 08-19-55 6,300 214.3 >100

4 01199400 Webatuck Creek near South Amenia 

NY

Dutchess 81.00 2 414651 733321 1962-76,84 05-29-84 3,400 42.0 15

5 01199420 Tenmile River near Wassaic NY Dutchess 120.00 2 414645 733334 1960-76,84 05-29-84 5,500 45.8 206 01199477 Stony Brook near Dover Plains NY Dutchess 1.93 2 414238 733718 1976-99 04-04-87 532 275.6 607 01200000 Tenmile River near Gaylordsville CT Dutchess 203.00 2 413932 733144 1930-87,92-99 08-19-55 17,400 85.7 >100

8 01200500 Housatonic River at Gaylordsville 

CT

Litchfield, CT

996.00 2 413911 732925 1941-99 08-19-55 51,800 52.0 >100

9 01208990 Saugatuck River near Redding CT Fairfield, CT 21.00 2 411740 732344 1962-99 03-25-69 2,160 102.9 25

10 01209700 Norwalk River at South Wilton CT Fairfield, CT 30.00 2 410949 732511 1963-99 04-10-80 2,890 96.3 1311 01311992 Arbutus Pond Outlet near Newcomb 

NY

Essex 1.22 1 435856 741409 1991-2001 01-09-98 40 32.8 8

12 01312000 Hudson River near Newcomb NY Essex 192.00 1 435800 740755 1926-99 01-09-98 11,500 59.9 >100

13 01313500 Cedar River Below Chain Lakes near 

Indian Lake NY

Hamilton 160.00 1 435120 741420 1931-69 09-28-42 10,200 63.8 >100

14 01314000 Hudson River at Gooley near Indian 

Lake NY

Essex 419.00 1 435003 741145 1917-68 01-01-49 15,000 35.8 50

15 01315500 Hudson River at North Creek NY Warren 792.00 1 434203 735902 1908-99 12-31-48 28,900 36.5 8016 01317000 Schroon River at Riverbank NY Warren 527.00 1 433634 734417 1908-70,87-99 03-21-36 12,100 23.0 >100

17 01318500 Hudson River at Hadley NY Saratoga 1,664.00 1 431908 735041 1908-99 01-27-13 49,000 29.4 >10018 01319000 East Branch Sacandaga River at 

Griffin NY

Hamilton 114.00 1 432825 741325 1934-78 12-31-48 10,700 93.9 90

19 01319800 West Branch Sacandaga River at 

Arietta NY

Hamilton 28.90 1 431503 743106 1963-85 03-25-79 1,940 67.1 20

20 01319950 Sand Lake Outlet ear Piseco NY Hamilton 7.16 1 432215 743247 1962-83,85 04-09-80 475 66.3 11

50 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

21 01321000 Sacandaga River near Hope NY Hamilton 491.00 1 432110 741615 1912-99 03-27-13 32,000 65.2 >10022 01325000 Sacandaga River at Stewarts Bridge 

near Hadley NY

Saratoga 1,055.00 1 431841 735204 1908-29 03-28-13 35,500 33.6 >100

23 01326500 Hudson River at Spier Falls NY Warren 2,779.00 1 431439 734450 1900-22 03-28-13 89,100 32.1 >10024 01328000 Bond Creek at Dunham Basin NY Washington 14.70 1 431822 733256 1948-82,84 12-31-48 1,370 93.2 35

25 01328758 Pecks Creek at Fort Miller NY Saratoga 2.38 1 430909 733525 1968-79 03-05-79 230 96.6 1026 01329000 Batten Kill at Arlington VT Bennington, 

VT

152.00 1 430434 730926 1929-84 03-18-36 11,100 73.0 >100

27 01329154 Steele Brook at Shushan NY Washington 2.85 1 430535 731938 1979-99 01-19-96 149 52.3 9

28 01329500 Batten Kill at Battenville NY Washington 394.00 1 430605 732555 1923-68,87-99 11-04-27 21,300 54.1 >100

29 01329780 Sessions Brook at Porters Corners 

NY

Saratoga 1.04 1 430921 735245 1968-86 03-14-77 80 76.9 30

30 01329900 Glowegee Creek Trib at Mosherville 

NY

Saratoga 1.42 1 430324 740058 1968-86 03-14-77 139 97.9 16

31 01330000 Glowegee Creek at West Milton NY Saratoga 26.00 1 430150 735540 1949-63,91-99 12-31-48 1,670 64.2 4032 01330500 Kayaderosseras Creek near West 

Milton NY

Saratoga 90.00 1 430218 735435 1927-95 03-18-36 4,710 52.3 90

33 01330880 Saratoga Lake Trib near Bemis 

Heights NY

Saratoga 2.98 1 425943 734306 1968-95 08-07-86 448 150.3 >100

34 01331400 Dry Brook near Adams MA Berkshire, 

MA

7.67 1 423520 730648 1963-73 07-19-66 675 88.0 8

35 01331500 Hoosic River at Adams MA Berkshire, 

MA

46.70 1 423640 730728 1932-99 09-21-38 5,080 108.8 >100

36 01332000 North Branch Hoosic River at North 

Adams MA

Berkshire, MA

40.90 1 424208 730537 1928,32-90 11- -27 9,980 244.0 90

37 01332500 Hoosic River near Williamstown 

MA

Berkshire, MA

126.00 1 424201 730934 1941-99 12-31-48 13,000 103.2 80

38 01333000 Green River at Williamstown MA Berkshire, 

MA

42.60 1 424232 731150 1950-99 12-21-73 4,060 95.3 50

39 01333367 Little Hoosic River at Cherryplain 

NY

Rensselaer 2.22 1 423757 732123 1976-86 04-19-83 167 75.2 9

40 01333500 Little Hoosic River at Petersburg NY Rensselaer 56.10 1 424550 732016 1949,52-99 12-31-48 7,470 133.2 >100

Tables 7–10 51
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

41 01333900 Paran Creek near South Shaftsbury 

VT

Bennington, VT

2.38 1 425813 731119 1964-78,99 06-30-73 193 81.1 10

42 01334000 Walloomsac River near North 

Bennington VT

Bennington, VT

111.00 1 425447 731525 1932-99 09-21-38 8,450 76.1 35

43 01334500 Hoosic River near Eagle Bridge NY Rensselaer 510.00 1 425619 732239 1911-99 12-31-48 55,400 108.6 >100

44 01335500 Hudson River at Mechanicville NY Saratoga 4,500.00 1 425445 734045 1869,1888-29 03-28-13 120,000 26.7 >10045 01342730 Steele Creek at Ilion NY Herkimer 26.20 1 430005 750244 1965-85,2000 05-13-00 2,100 80.2 14

46 01342797 Vly Brook near Morehouseville NY Hamilton 3.28 1 432334 744959 1993-02 10-21-95 320 97.6 1647 01342800 West Canada Creek at Nobleboro NY Herkimer 193.00 1 432347 745135 1958-76,87-99 12-29-84 20,000 103.6 >100

48 01346820 Mohawk River Trib at Indian Castle 

NY

Herkimer 1.36 1 430034 744747 1974-86 03-22-80 210 154.4 60

49 01347460 Spruce Lake Trib near Salisbury 

Center NY

Herkimer 0.54 1 431051 744844 1975-86,2000 10-17-77 72 133.3 15

50 01348000 East Canada Creek at East Creek NY Herkimer 289.00 1 430100 744428 1913,28-96,98 01-09-98 17,800 61.6 6051 01348420 North Creek near Ephratah NY Fulton 6.52 1 430028 743354 1975-99 06-29-82 540 82.8 2552 01349000 Otsquago Creek at Fort Plain NY Montgomery 61.00 1 425546 743735 1950-89 10-28-81 10,400 170.5 3053 01349150 Canajoharie Creek near Canajoharie 

NY

Montgomery 59.70 1 425234 743612 1993-02 11-09-96 3,630 60.8 5

54 01349360 Van Wie Creek Trib near Randall NY Montgomery 1.00 1 425411 742555 1974-86 03-21-80 219 219.0 6055 01349700 East Kill near Jewett Center NY Greene 35.60 3 421457 741811 1965-74,96-99 01-19-96 13,500 379.2 >100

56 01350000 Schoharie Creek at Prattsville NY Greene 237.00 3 421910 742613 1904,08-99 01-19-96 52,800 222.8 45

57 01350080 Manor Kill at West Conesville near 

Gilboa NY

Schoharie 32.40 3 422237 742448 1987-99 01-19-96 5,050 155.9 25

58 01350120 Platter Kill at Gilboa NY Schoharie 10.90 3 422422 742651 1976-99 01-19-96 1,370 125.7 2559 01350140 Mine Kill near North Blenheim NY Schoharie 16.20 3 422544 742824 1975-99 01-19-96 2,550 157.4 3560 01350900 Beaverdam Creek near Knox NY Albany 6.91 3 423855 740756 1963-86 03-27-63 1,400 202.6 80

52 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

61 01351000 Fox Creek at West Berne NY Albany 67.20 3 423742 741101 1963-74,87 12-21-73 6,400 95.2 13

62 01354300 Plotter Kill at Rynex Corners NY Schenectady 3.70 1 424916 740420 1958-86 09-12-60 725 195.9 >100

63 01355405 Indian Kill near Glenville Center NY Schenectady 3.11 1 425340 735727 1968-86 03-22-80 200 64.3 12

64 01358500 Poesten Kill near Troy NY Rensselaer 89.40 2 424400 733800 1924-68,77,84 09-22-38 11,900 133.1 >100

65 01359519 Normans Kill near Westmere NY Albany 131.00 2 424043 735425 1956,68-84,87 10-16-55 10,800 82.4 65

66 01359528 Normans Kill at Albany NY Albany 168.00 2 423800 734822 1980-84,92-99 09-17-99 11,800 70.2 3567 01359750 Moordener Kill at Castleton-onHudson NY Rensselaer 32.60 2 423202 734415 1958-95 03-15-86 1,520 46.6 1668 01359902 Coeymans Creek near Selkirk NY Albany 35.10 2 423138 734914 1968-77,96,99 09-16-99 4,800 136.8 5069 01359924 Hannacrois Creek near New 

Baltimore NY

Greene 61.60 2 422622 734841 1968-77,96,99 06-09-96 3,700 60.1 35

70 01360640 Valatie Kill near Nassau NY Rensselaer 9.48 2 423307 733531 1991-00 06-06-00 856 90.3 1471 01361000 Kinderhook Creek at Rossman NY Columbia 329.00 2 421950 734440 1928-68,87-99 12-31-48 29,800 90.6 >100

72 01361200 Claverack Creek at Claverack NY Columbia 60.60 2 421254 734346 1961-84,93-95 06-30-73 5,590 92.2 35

73 01361453 Catskill Creek Trib at Franklinton 

NY

Schoharie 3.61 2 423135 741833 1968-87 04-04-87 1,100 304.7 >100

74 01361500 Catskill Creek at Oak Hill NY Greene 98.00 2 422416 740907 1911-77,87-99 04-04-87 15,400 157.1 90

75 01361570 Tenmile Creek at Oak Hill NY Greene 35.30 2 422426 740806 1969-80,87 03-21-80 3,800 107.6 3576 01361900 Shingle Kill at Cairo NY Greene 13.90 2 421822 740013 1953-56,65-87 03-21-80 3,600 259.0 3577 01362100 Roeliff Jansen Kill near Hillsdale NY Columbia 27.50 2 420914 733114 1958-99 06-30-73 3,280 119.3 7078 01362197 Bushnellsville Creek at Shandaken 

NY

Ulster 11.40 2 420725 742402 1956,72-87,

94-05

04-03-05 2,700 236.8 50

79 01362200 Esopus Creek at Allaben NY Ulster 63.70 2 420701 742250 1951,64-05 04-03-05 21,700 340.7 6080 01362500 Esopus Creek at Coldbrook NY Ulster 192.00 2 420051 741616 1932-05 03-21-80 65,300 340.1 5081 01365000 Rondout Creek near Lowes Corners 

NY

Sullivan 38.30 2 415200 742912 1937-99 07-22-38 7,600 198.4 25

82 01365500 Chestnut Creek at Grahamsville NY Sullivan 20.90 2 415042 743227 1939-87,1999 10-15-55 4,640 222.0 4083 01366500 Rondout Creek near Lackawack NY Ulster 100.00 2 414625 742401 1928,32-51 08-26-28 26,700 267.0 >100

84 01366650 Sandburg Creek at Ellenville NY Ulster 56.70 2 414254 742321 1957-77 08-19-60 4,660 82.2 14

85 01367500 Rondout Creek at Rosendale NY Ulster 383.00 2 415035 740511 1910-18,27-51 08-27-28 27,300 71.3 25

Tables 7–10 53
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

86 01368000 Wallkill River near Unionville NY Sussex, NJ 140.00 2 411536 743258 1938-84,89-93 08-19-55 6,880 49.1 >10087 01368500 Rutgers Creek at Gardnerville NY Orange 59.70 2 412040 742910 1944-68,87-99 08-19-55 8,490 142.2 >10088 01369000 Pochuck Creek near Pine Island NY Orange 98.00 2 411632 742819 1938-77,84 10-16-55 3,090 31.5 20

89 01369500 Quaker Creek at Florida NY Orange 9.74 2 412021 742145 1938-79,84 09-21-38 1,050 107.8 6090 01370000 Wallkill River at Pellets Island NY Orange 380.00 2 412250 742450 1920-68,84-93 03-14-36 12,400 32.6 7091 01370500 Wallkill River near Phillipsburg NY Orange 406.00 2 412557 742229 1936-59,89-93 03-13-36 11,500 28.3 3592 01371000 Shawangunk Kill at Pine Bush NY Ulster 104.00 2 413705 741740 1955-75,89-93 08-19-55 9,700 93.3 7093 01371400 Shawangunk Kill at Ganahgote NY Ulster 147.00 2 414112 741028 1955-56,62-69 08-19-55 14,000 95.2 10094 01371500 Wallkill River at Gardiner NY Ulster 695.00 2 414110 740956 1925-99 10-16-55 30,800 44.3 >100

95 01372040 Crum Elbow Creek at Hyde Park NY Dutchess 17.30 2 414724 735553 1960-76 07-21-75 600 34.7 8

96 01372200 Wappinger Creek near Clinton 

Corners NY

Dutchess 92.40 2 414855 734550 1956-82,84 06-30-73 8,510 92.1 90

97 01372300 Little Wappinger Creek at Salt Point 

NY

Dutchess 32.90 2 414818 734738 1956-75,84 07-21-75 1,590 48.3 16

98 01372500 Wappinger Creek near Wappingers 

Falls NY

Dutchess 181.00 2 413911 735223 1929-99 08-19-55 18,600 102.8 >100

99 01372800 Fishkill Creek at Hopewell Junction 

NY

Dutchess 57.30 2 413422 734825 1964-75,87-99 12-21-73 2,770 48.3 18

100 01373500 Fishkill Creek at Beacon NY Dutchess 190.00 2 413040 735655 1902,45-68,84 03-01-02 13,700 72.1 >100

101 01373690 Woodbury C near Highland Mills NY Orange 11.20 2 412200 740617 1966-72,77-84 04-05-84 1,940 173.2 25

102 01374130 Canopus Creek at Oscawana Corners 

NY

Putnam 8.30 2 412243 735223 1975-86 04-06-84 416 50.1 5

103 01374250 Peekskill Hollow Creek at Tompkins 

Corners NY

Putnam 14.90 2 412318 734847 1975-99 09-16-99 2,000 134.2 70

104 01374440 Cedar Pond Brook at Stony Point NY Rockland 17.30 2 411336 735904 1960-68,75-79 11-08-77 2,600 150.3 25105 01384500 Ringwood Creek near Wanaque NJ Passaic, NJ 19.10 2 410736 741552 1935-78,85-99 03-30-51 1,570 82.2 30

54 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

106 01386000 West Brook near Wanaque NJ Passaic, NJ 11.80 2 410424 741842 1936-78 03-30-51 1,900 161.0 40

107 01387250 Ramapo River at Sloatsburg NY Rockland 60.10 2 411005 741127 1956-63,75-79 10-16-55 5,970 99.3 50108 01387300 Stony Brook at Sloatsburg NY Rockland 18.20 2 410944 741110 1960-69 05-29-68 1,760 96.7 25109 01387350 Nakoma Brook at Sloatsburg NY Rockland 5.40 2 410914 741138 1960-78 11-08-77 550 101.9 25110 01387400 Ramapo River at Ramapo NY Rockland 86.90 2 410825 741008 1980-99 04-05-84 10,700 123.1 100111 01387410 Torne Brook at Ramapo NY Rockland 2.60 2 410834 740944 1960-99 11-08-77 1,520 584.6 60112 01387420 Ramapo River at Suffern NY Rockland 93.00 2 410706 740938 1980-99 04-05-84 12,300 132.3 100113 01387450 Mahwah River near Suffern NY Rockland 12.30 2 410827 740701 1959-95 11-08-77 1,840 149.6 30114 01387500 Ramapo River near Mahwah NJ Bergen, NJ 120.00 2 410551 740948 1904-14,23-99 04-05-84 15,500 129.2 90115 01413500 East Branch Delaware River at 

Margaretville NY

Delaware 163.00 3 420841 743914 1937-99 01-19-96 25,800 158.3 60

116 01414000 Platte Kill at Dunraven NY Delaware 34.90 3 420759 744145 1942-62,96-05 01-19-96 5,690 163.0 50117 01414500 Mill Brook near Dunraven NY Delaware 25.20 3 420622 744351 1937-99 01-19-96 5,380 213.5 60118 01415000 Tremper Kill near Andes NY Delaware 33.20 3 420712 744908 1937-99 01-19-96 5,000 150.6 60119 01415500 Terry Clove Kill near Pepacton NY Delaware 13.60 3 420750 745402 1937-62 05-23-42 4,010 294.9 >100

120 01417000 East Branch Delaware River at 

Downsville NY

Delaware 372.00 3 420430 745836 1942-54 11-26-50 23,900 64.2 7

121 01417185 Campbell Brook Trib near 

Downsville NY

Delaware 0.41 3 420241 745837 1975-86 11-26-79 57 139.0 18

122 01417500 East Branch Delaware River at 

Harvard NY

Delaware 458.00 3 420129 750713 1935-54 09-22-38 31,400 68.6 11

123 01418000 Beaver Kill near Turnwood NY Ulster 40.80 3 420203 744355 1949-59 11-25-50 7,400 181.4 20124 01418500 Beaver Kill at Craigie Clair NY Sullivan 81.90 3 415747 745202 1937-74,96 01-19-96 13,000 158.7 35125 01419500 Willowemoc Creek near Livingston 

Manor NY

Sullivan 62.60 3 415412 744847 1938-74,96 07-28-69 15,700 250.8 >100

Tables 7–10 55
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

126 01420000 Little Beaver Kill near Livingston 

Manor NY

Sullivan 20.10 3 415222 744751 1925-81 08-26-28 3,420 170.1 30

127 01420500 Beaver Kill at Cooks Falls NY Delaware 241.00 3 415647 745848 1914-05 04-03-05 50,800 210.8 >100

128 01421000 East Branch Delaware River at Fishs 

Eddy NY

Delaware 784.00 3 415823 751028 1904,13-54 10-09-03 70,000 89.3 45

129 01421900 West Branch Delaware River 

Upstream From Delhi NY

Delaware 134.00 4 421649 745427 1937-74,96-99 01-19-96 13,000 97.0 >100

130 01422500 Little Delaware River near Delhi NY Delaware 49.80 4 421508 745407 1938-74,96-99 01-19-96 6,100 122.5 >100131 01423000 West Branch Delaware River at 

Walton NY

Delaware 332.00 4 420958 750826 1951-99 01-19-96 25,000 75.3 70

132 01423500 Dryden Brook near Granton NY Delaware 8.10 4 420719 751450 1952-67 04-04-60 633 78.1 9133 0142400103 Trout Creek near Trout Creek NY Delaware 20.20 4 421025 751647 1952-67,96-99 01-19-96 2,800 138.6 100134 01424500 Trout Creek at Cannonsville NY Delaware 49.50 4 420545 751925 1941-63 03-22-48 4,600 92.9 90135 01425000 West Branch. Delaware River at 

Stilesville NY

Delaware 456.00 4 420429 752347 1952-63 01-22-59 17,500 38.4 5

136 01425500 Cold Spring Brook at China NY Delaware 1.49 4 420940 752335 1935-68 10-30-35 335 224.8 >100

137 01425675 Oquaga Creek near North Sanford 

NY

Broome 4.69 4 421028 752625 1970-81 02-11-81 480 102.3 25

138 01426000 Oquaga Creek at Deposit NY Broome 67.60 4 420331 752542 1941-73,04-05 07-04-70 7,170 106.1 70139 01426500 West Branch Delaware River at Hale 

Eddy NY

Delaware 595.00 4 420011 752302 1904,13-63 10-10-03 46,000 77.3 >100

140 01427500 Callicoon Creek at Callicoon NY Sullivan 110.00 3 414539 750255 1940-82,87-99 08-17-47 16,000 145.5 >100141 01428000 Tenmile River at Tusten NY Sullivan 45.60 3 413351 750056 1946-73,2000 08-19-55 6,850 150.2 >100142 01428500 Del River Abv Lackawaxen River 

near Barryville NY

Sullivan 2,020.00 3 413032 745910 1941-63 08-19-55 130,000 64.4 >100

143 01428750 West Branch Lackawaxen River near 

Aldenville PA

Wayne, PA 40.60 3 414028 752235 1975-99 01-19-96 4,340 106.9 45

144 01434000 Delaware River at Port Jervis NY Pike, PA 3,070.00 3 412214 744152 1904-63 10-10-03 205,000 66.8 >100

145 0143400680 East Branch Neversink River 

northeast of Denning NY

Ulster 8.93 3 415801 742654 1991-2005 09-16-99 3,070 343.8 30

56 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

146 01434010 East Branch Neversink River at 

Denning NY

Ulster 13.30 3 415730 742826 1984-99 04-04-87 4,460 335.3 30

147 01434017 East Branch Neversink River near 

Claryville NY

Ulster 22.90 3 415531 743226 1992-2005 04-02-05 4,590 200.4 11

148 01434021 W Br Nev River at Winnisook L near 

Frost Valley NY

Ulster 0.77 3 420040 742453 1992-2001 09-16-99 212 275.3 11

149 01434025 Biscuit Brook Above Pigeon Brook 

at Frost Valley NY

Ulster 3.72 3 415943 743005 1984-99 04-04-87 815 219.1 12

150 01434092 Shelter Creek Below Dry Creek near 

Frost Valley NY

Ulster 0.62 3 415812 743053 1993-2002 12-17-00 140 225.8 10

151 01434498 West Branch Neversink River at 

Claryville NY

Sullivan 33.80 3 415513 743430 1992-2005 04-02-05 9,570 283.1 20

152 01435000 Neversink River near Claryville NY Sullivan 66.60 3 415324 743525 1938-05 11-25-50 23,400 351.4 >100

153 01436000 Neversink River at Neversink NY Sullivan 92.60 3 414912 743809 1942-1953 11-25-50 22,300 240.8 50

154 01436500 Neversink River at Woodbourne NY Sullivan 113.00 3 414524 743552 1938-53 11-26-50 22,000 194.7 30155 01437000 Neversink River at Oakland Valley 

NY

Sullivan 223.00 3 412945 743848 1928-53 11-26-50 23,300 104.5 15

156 01437500 Neversink River at Godeffroy NY Orange 307.00 3 412628 743608 1938-53 11-26-50 24,500 79.8 11157 01438500 Delaware River at Montague NJ Pike, PA 3,480.00 3 411833 744744 1940-63 08-19-55 250,000 71.8 >100

158 01440000 Flat Brook near Flatbrookville NJ Sussex, NJ 64.00 2 410624 745709 1924-99 08-19-55 9,560 149.4 >100159 01443500 Paulins Kill at Blairstown NJ Warren, NJ 126.00 2 405844 745715 1922-76,78-99 08-19-55 8,750 69.4 >100160 01496370 Mink Creek at Richfield Springs NY Otsego 10.40 4 425055 750010 1969-86 03-19-86 498 47.9 8

161 01496500 Oaks Creek at Index NY Otsego 102.00 4 423956 745736 1930-32,37-95 10-17-77 3,320 32.5 80162 01497500 Susquehanna River at Colliersville 

NY

Otsego 349.00 4 422959 745852 1924-72 03-19-36 8,740 25.0 50

163 01497800 Schenevus Creek at Schenevus NY Otsego 54.20 4 423247 744954 1963-76 03-05-64 2,200 40.6 16164 01497805 Little Elk Creek near Westford NY Otsego 3.73 4 423801 744745 1978-99 01-19-96 278 74.5 18165 01498500 Charlotte Creek at West Davenport 

NY

Delaware 167.00 4 422642 745750 1938-75 09-22-38 14,000 83.8 >100

Tables 7–10 57
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

166 01499000 Otego Creek near Oneonta NY Otsego 108.00 4 422703 750654 1941-75 12-30-42 6,000 55.6 70

167 01500500 Susquehanna River at Unadilla NY Otsego 982.00 4 421917 751901 1938-99 03-18-36 31,300 31.9 >100

168 01501000 Unadilla River near New Berlin NY Chenango 199.00 4 423837 751924 1924-72 03-05-64 6,940 34.9 30

169 01501015 Mill Brook at New Berlin NY Chenango 4.64 4 423732 751943 1975-86 03-30-77 450 97.0 20170 01501140 Wharton Creek Trib near Edmeston 

NY

Otsego 2.02 4 424235 751319 1976-86 09-27-85 290 143.6 60

171 01501500 Sage Brook near South New Berlin 

NY

Chenango 0.70 4 423152 752532 1933-68 07-22-45 287 410.0 >100

172 01502000 Butternut Creek at Morris NY Otsego 59.70 4 423243 751422 1938-95 10-17-77 5,980 100.2 >100173 01502500 Unadilla River at Rockdale NY Chenango 520.00 4 422240 752423 1930-99 12-31-42 17,400 33.5 50

174 01502632 Susquehanna River at Bainbridge NY Chenango 1,610.00 4 421729 752836 1988-99 03-31-93 36,600 22.7 9175 01502701 Susquehanna River at Afton NY Chenango 1,716.00 4 421338 753127 1972,77-90,96 03-07-79 42,000 24.5 14176 01502714 Ouaquaga Creek near Belden NY Broome 3.37 4 421012 754045 1975-86 08-02-86 496 147.2 70177 01502731 Susquehanna River at Windsor NY Broome 1,820.00 4 420429 753817 1988-99 01-20-96 40,000 22.0 10178 01503000 Susquehanna River at Conklin NY Broome 2,232.00 4 420207 754812 1913-05 03-18-36 61,600 27.6 60179 01503960 Electric Light Stream near 

Morrisville NY

Madison 7.21 4 425251 753837 1976-86 10-09-76 400 55.5 6

180 01503980 Chenango River at Eaton NY Madison 24.30 4 425102 753621 1964-65,67-99 03-06-64 2,350 96.7 >100

181 01505000 Chenango River at Sherburne NY Chenango 263.00 4 424043 753039 1936,38-05 04-03-05 9,330 35.5 60

182 01505017 Cold Brook near North Norwich NY Chenango 5.80 4 423630 753216 1975-86 03-05-79 300 51.7 6183 01505500 Canasawacta Creek near South 

Plymouth NY

Chenango 57.90 4 423350 753310 1945-75,77 02-25-61 6,980 120.6 60

184 01507000 Chenango River at Greene NY Chenango 593.00 4 421928 754618 1937-05 04-03-05 20,800 35.1 90185 01507500 Genegantslet Creek at Smithville 

Flats NY

Chenango 82.30 4 422334 754815 1938-71 12-30-42 5,890 71.6 40

58 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

186 01508000 Shackham Brook near Truxton NY Cortland 2.95 4 424602 760108 1933-68 06-03-47 487 165.1 18

187 01508500 Albright Creek at East Homer NY Cortland 6.81 4 424009 760612 1939-76 09-26-75 2,480 364.2 >100

188 01508803 West Branch Tioughnioga River at 

Homer NY

Cortland 71.50 4 423818 761036 1967-68,73-92 10-28-81 2,710 37.9 25

189 01508946 Otter Creek Trib at State 

Highway 222 near Cortland NY

Cortland 2.85 4 423522 761401 1976-86 10-28-81 690 242.1 >100

190 01509000 Tioughnioga River at Cortland NY Cortland 292.00 4 423610 760935 1939-05 04-03-05 14,200 48.6 35

191 01509520 Tioughnioga River at Lisle NY Broome 453.00 4 422059 755959 1988-05 04-02-05 19,800 43.7 45192 01510000 Otselic River at Cincinnatus NY Cortland 147.00 4 423228 755400 1938-64,70-05 04-03-05 11,300 76.9 >100

193 01510500 Otselic River near Upper Lisle NY Cortland 217.00 4 422518 755659 1935,37-69 07-08-35 15,400 71.0 90

194 01510610 Merrill Creek Trib near Texas Valley 

NY

Cortland 5.32 4 422803 755919 1976-81,83-99 01-19-96 1,150 216.2 70

195 01511500 Tioughnioga River at Itaska NY Broome 730.00 4 421753 755433 1930-41 07-08-35 61,100 83.7 >100

196 01512500 Chenango River near Chenango 

Forks NY

Broome 1,483.00 4 421305 755055 1913-05 07-08-35 96,000 64.7 >100

197 01513500 Susquehanna River at Vestal NY Broome 3,941.00 4 420527 760323 1936-05 03-18-36 107,000 27.2 80

198 01513712 Nanticoke Creek Trib at Nanticoke 

NY

Broome 1.70 5 421640 760251 1975-86 07-11-76 977 574.7 >100

199 01513790 Nanticoke Creek at Union Center NY Broome 90.70 5 420856 760400 1956,63-77 06-23-72 13,500 148.8 30

200 01513831 Susquehanna River at Owego NY Tioga 4,216.00 5 420601 761539 1988-96,99 03-18-36 112,000 26.6 70201 01514000 Owego Creek near Owego NY Tioga 185.00 5 420745 761615 1930-99 07-08-35 23,500 127.0 >100

202 01514801 Catatonk Creek Northwest of Owego 

NY

Tioga 150.00 5 420818 761723 1988-99 01-20-96 9,740 64.9 40

203 01515000 Susquehanna River near Waverly NY Bradford, PA 4,773.00 5 415905 763005 1936-99 03- -36 128,000 26.8 50204 01516500 Corey Creek near Mainesburg PA Tioga, PA 12.20 5 414727 770054 1955-99 06-23-72 5,580 457.4 100205 01516800 Manns Creek near Mansfield PA Tioga, PA 3.01 5 414919 770550 1960-77 06-22-72 715 237.5 25

Tables 7–10 59
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

206 01517000 Elk Run near Mainesburg PA Tioga, PA 10.20 5 414854 765755 1955-78 06-22-72 3,940 386.3 >100207 01518000 Tioga River at Tioga PA Tioga, PA 282.00 5 415430 770747 1939-76 06-22-72 59,000 209.2 >100208 01518420 Crooked Creek at Middlebury Center 

PA

Tioga, PA 74.30 5 415033 771625 1986-99 11-08-96 15,300 205.9 40

209 01518500 Crooked Creek at Tioga PA Tioga, PA 122.00 5 415408 770855 1954-99 11-08-96 22,000 180.3 60210 01518862 Cowanesque River at Westfield PA Tioga, PA 90.60 5 415523 773156 1984-99 01-19-96 13,000 143.5 20211 01519200 Cowanesque River at Elkland PA Tioga, PA 235.00 5 415915 771809 1980-99 01-19-96 28,000 119.1 40212 01520000 Cowanesque River near 

Lawrenceville PA

Tioga, PA 298.00 5 415948 770825 1952-78 09-26-75 43,700 146.6 70

213 01520500 Tioga River at Lindley NY Steuben 771.00 5 420143 770757 1930-79 06-23-72 128,000 166.0 >100

214 01521596 Big Creek near Howard NY Steuben 6.32 5 422201 773433 1977-99 01-19-96 1,600 253.2 60

215 01522500 Karr Valley Creek at Almond NY Allegany 27.40 5 421840 774505 1935-68,71-73 06-23-72 10,900 397.8 >100

216 01523500 Canacadea Creek near Hornell NY Steuben 57.90 5 422005 774100 1927-28,35-48 07-08-35 21,000 362.7 >100217 01525000 Bennett Creek at Canisteo NY Steuben 95.30 5 421556 773539 1939-47,72 06-22-72 19,500 204.6 >100218 01525500 Canisteo River at West Cameron NY Steuben 340.00 5 421320 772505 1931,35-99 06-23-72 43,000 126.5 >100219 01526000 Tuscarora Creek near South Addison 

NY

Steuben 114.00 5 420400 771702 1937-70,72 06-23-72 18,700 164.0 60

220 01526500 Tioga River near Erwins NY Steuben 1,377.00 5 420716 770746 1919-78 06-23-72 190,000 138.0 >100

221 01527000 Cohocton River at Cohocton NY Steuben 52.20 5 423000 773002 1935,51-99 06-23-72 2,260 43.3 90

222 01528000 Fivemile Creek near Kanona NY Steuben 66.80 5 422318 772129 1937-95 06-23-72 5,110 76.5 >100

223 01528320 Cohocton River at Bath NY Steuben 340.00 5 422036 772039 1988-96,99 04-01-93 7,000 20.6 3

224 01529500 Cohocton River near Campbell NY Steuben 470.00 5 421509 771301 1919-99 07-08-35 41,100 87.4 >100

225 01530301 Cuthrie Run near Big Flats NY Chemung 5.39 5 421043 765532 1976,79-99 06-19-76 800 148.4 16

226 01530500 Newtown Creek at Elmira NY Chemung 77.50 5 420616 764754 1938-89 06-23-72 4,000 51.6 15227 01531000 Chemung River at Chemung NY Chemung 2,506.00 5 420008 763806 1904-78 06-23-72 189,000 75.4 >100

228 01533250 Tuscarora Creek near Silvara PA Bradford, PA 11.80 5 414225 760710 1963-95 06-22-72 1,610 136.4 30

229 01542810 Waldy Run near Emporium PA Cameron, PA 5.24 5 413444 781734 1964-99 09-28-67 828 158.0 40230 01543700 First Fork Sinnemahoning Creek at 

Wharton PA

Potter, PA 182.00 5 413108 780140 1984-99 01-19-96 15,400 84.6 30

60 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

231 03007800 Allegheny River at Port Allegany PA Mckean, PA 248.00 5 414907 781735 1972,75-99 06-23-72 21,700 87.5 >100232 03010500 Allegheny River at Eldred PA Mckean, PA 550.00 5 415748 782311 1940-99 06-23-72 65,400 118.9 >100233 03010734 Ischua Creek Trib near Machias NY Cattaraugus 5.12 5 422428 783133 1978-99 09-14-79 570 111.3 18

234 03010800 Olean Creek near Olean NY Cattaraugus 198.00 5 420712 782512 1950,58-95 09-29-67 18,200 91.9 >100

235 03011000 Great Valley Creek near Salamanca 

NY

Cattaraugus 137.00 5 421028 784128 1951-68,77-92 09-28-67 28,600 208.8 >100

236 03011020 Allegheny River at Salamanca NY Cattaraugus 1,608.00 5 420923 784256 1904-99 06-23-72 73,000 45.4 >100237 03011800 Kinzua Creek near Guffey PA Mckean, PA 46.40 5 414559 784308 1966-99 06-22-72 5,220 112.5 40

238 03013000 Conewango Creek at Waterboro NY Chautauqua 290.00 5 421015 790410 1938-94 04-07-47 8,600 29.7 50239 03013800 Ball Creek at Stow NY Chautauqua 9.06 5 420913 792427 1974-99 09-14-79 2,000 220.8 40240 03015390 Hare Creek near Corry PA Erie, PA 12.30 5 415629 793841 1964-85,94 09-19-77 2,240 182.1 50241 03015500 Brokenstraw Creek at Youngsville 

PA

Warren, PA 321.00 5 415109 791903 1910-99 03-25-13 18,000 56.1 >100

242 03021350 French Creek near Wattsburg PA Erie, PA 92.00 5 420055 794658 1975-99 09-14-79 6,350 69.0 17

243 04213040 Raccoon Creek near West Springfield 

PA

Erie, PA 2.53 5 415642 802651 1961-95 12-28-68 408 161.3 30

244 04213200 Mill Creek at Erie PA Erie, PA 9.16 5 420554 800435 1964-88,94-99 09-17-96 3,310 361.4 80245 04213376 Canadaway Creek at Fredonia NY Chautauqua 32.90 5 422702 792103 1979,87-99 08-07-79 12,000 364.7 >100

246 04213490 South Branch Cattaraugus Creek 

near Otto NY

Cattaraugus 25.10 5 422154 784804 1963-99 09-14-79 4,350 173.3 50

247 04213500 Cattaraugus Creek at Gowanda NY Erie 436.00 5 422750 785607 1940-98 03-07-56 34,600 79.4 50248 04214040 Delaware Creek near Angola NY Erie 8.32 5 423746 790315 1963-86 02-24-85 672 80.8 11249 04214200 Eighteenmile Creek at North Boston 

NY

Erie 37.20 5 424104 784641 1963-76 09-29-67 5,790 155.6 50

250 04214250 Smoke Creek at Lackawanna NY Erie 14.30 5 424921 784810 1953-55,63-76 03-01-55 2,330 162.9 >100

Tables 7–10 61
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

251 04214400 Buffalo Creek near Wales Hollow 

NY

Erie 76.90 5 424454 783031 1963-74 09-28-67 9,260 120.4 30

252 04214410 Hunter Creek at Colegrave NY Erie 14.00 5 424411 783255 1964-86 09-28-67 1,680 120.0 25253 04214500 Buffalo Creek at Gardenville NY Erie 142.00 5 425117 784519 1937,39-99 06- -37 16,000 112.7 >100

254 04214980 Little Buffalo Creek at East 

Lancaster NY

Erie 24.00 5 425246 783627 1963,66-80 03-17-63 2,140 89.2 16

255 04215000 Cayuga Creek near Lancaster NY Erie 96.40 5 425324 783843 1937-68,72-99 06- -37 18,000 186.7 >100

256 04215500 Cazenovia Creek at Ebenezer NY Erie 135.00 5 424947 784631 1941-99 03-01-55 13,500 100.0 40

257 04216400 Tonawanda Creek near Johnsonburg 

NY

Wyoming 23.70 6 424305 781920 1962-86 06-23-72 1,850 78.1 35

258 04216418 Tonawanda Creek at Attica NY Wyoming 76.90 6 425150 781702 1972,78-99 07-08-98 9,400 122.2 >100

259 04216500 Little Tonawanda Creek at Linden 

NY

Genesee 22.10 6 425237 780948 1913-68,77-99 06-23-89 2,900 131.2 60

260 04216875 Little Tonawanda Creek Tributary 

near Batavia NY

Genesee 1.02 6 425633 780946 1976-86 09-25-77 156 152.9 45

261 04217000 Tonawanda Creek at Batavia NY Genesee 171.00 6 425951 781120 1942,45-99 03- -42 10,000 58.5 >100

262 04217500 Tonawanda Creek near Alabama NY Genesee 231.00 6 430528 782715 1956-89 04-01-40 9,000 39.0 70

263 04217700 Murder Creek at Pembroke NY Genesee 43.60 6 425937 782608 1962-86 03-18-63 1,870 42.9 16264 04217750 Murder Creek near Akron NY Erie 58.80 6 430249 783047 1983-99 02-25-85 3,000 51.0 60265 04218000 Tonawanda Creek at Rapids NY Niagara 349.00 6 430535 783811 1956-65,79-99 04-01-60 10,600 30.4 45266 04218518 Ellicott Creek Below Williamsville 

NY

Erie 81.60 6 425840 784550 1936,56-99 03-17-36 6,800 83.3 >100

267 04219645 Fourmile Creek near Youngstown 

NY

Niagara 4.88 6 431349 790101 1969-73,76-86 01-31-69 480 98.4 80

268 04219738 Eighteenmile Creek Trib near 

Lockport NY

Niagara 2.53 6 431220 784647 1977-86 02-19-81 365 144.3 45

269 04219900 Johnson Creek near Lyndonville NY Orleans 87.70 6 432021 782055 1954,62-99 02-17-54 5,430 61.9 >100

270 04219922 Oak Orchard Creek at Barrville Rd 

near Elba NY

Genesee 6.48 6 430542 780843 1976-86 03-22-78 205 31.6 5

62 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

271 04220150 Oak Orchard Creek at Medina NY Orleans 157.00 6 431226 782311 1962-76 03-20-63 1,480 9.4 7

272 04220250 West Creek near Hilton NY Monroe 31.00 6 431810 774850 1958-64,86-99 03-30-60 1,480 47.7 40273 0422026250 Northrup Creek at North Greece NY Monroe 11.70 6 431513 774333 1974,90-02 05-17-74 758 64.8 50274 04220500 Dyke Creek at Wellsville NY Allegany 72.10 5 420714 775613 1956-60,64-72 06-23-72 12,000 166.4 >100

275 04221000 Genesee River at Wellsville NY Allegany 288.00 5 420720 775727 1917-99 06-23-72 38,500 133.7 >100276 04221769 Black Creek at Hyder Flats Rd at 

Black Creek NY

Allegany 10.70 5 421603 781338 1978-93 12-30-90 1,560 145.8 11

277 04222600 Wiscoy Creek at Bliss NY Wyoming 22.00 5 423459 781417 1962-86 06-23-72 1,850 84.1 20278 04223000 Genesee River at Portageville NY Wyoming 984.00 5 423413 780233 1909-99 06-23-72 90,000 91.5 >100

279 04224700 Sugar Creek near Ossian NY Livingston 10.00 5 423052 774814 1964-86 06-18-84 1,460 146.0 25

280 04224775 Canaseraga Creek Above Dansville 

NY

Livingston 88.90 5 423208 774216 1975-99 01-19-96 7,340 82.6 40

281 04224807 Stony Brook Tributary at South 

Dansville NY

Steuben 3.15 5 422816 774021 1977-91,96-99 08-03-81 790 250.8 16

282 04224900 Mill Creek at Patchinville NY Steuben 4.22 5 423113 773506 1964-86 03-05-64 1,860 440.8 60283 04225000 Canaseraga Creek near Dansville NY Livingston 152.00 5 423336 774257 1911-12,16-76 06-23-72 9,600 63.2 30284 04226000 Keshequa Creek at Craig Colony at 

Sonyea NY

Livingston 68.30 5 424050 774945 1918-32,75-77 09-25-77 6,280 91.9 12

285 04227000 Canaseraga Creek at Shakers 

Crossing NY

Livingston 335.00 5 424413 775027 1959-70,75-99 06-23-72 11,200 33.4 45

286 04227500 Genesee River near Mount Morris 

NY

Livingston 1,424.00 5 424600 775021 1890-1951,72 05-17-16 55,100 38.7 30

287 04229500 Honeoye Creek at Honeoye Falls NY Monroe 196.00 6 425726 773521 1946-70,72-99 06-23-72 6,600 33.7 >100

288 04230380 Oatka Creek at Warsaw NY Wyoming 39.10 6 424439 780816 1964-99 07-08-98 4,110 105.1 60

289 04230500 Oatka Creek at Garbutt NY Monroe 200.00 6 430036 774730 1946-99 03-31-60 7,050 35.3 50290 04231000 Black Creek at Churchville NY Monroe 130.00 6 430602 775257 1946-99 03-31-60 4,880 37.5 >100

Tables 7–10 63
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

291 04231040 Hotel Creek at Griffin Rd near 

Churchville NY

Monroe 4.57 6 430336 775228 1976-86 03-05-79 88 19.3 5

292 04232000 Genesee River at Rochester NY Monroe 2,467.00 6 431050 773740 1865,11-51,72 03-18-

1865

54,000 21.9 50

293 04232034 Irondequoit Creek at Rr Mills near 

Fishers NY

Ontario 39.20 6 430140 772842 1992-2001 01-08-98 1,000 25.5 80

294 04232040 Irondequoit Creek near Pittsford NY Monroe 44.40 6 430315 772928 1962-72,81-91 03-12-62 640 14.4 5295 04232046 Thomas Creek at Fairport NY Monroe 28.50 6 430622 772744 1980-90 02-15-84 232 8.1 2296 04232047 Irondequoit Creek at Linden Avenue 

E Rochester NY

Monroe 101.00 6 430716 772836 1974-88 10-29-74 1,480 14.7 14

297 0423204920 East Branch Allen Creek at Pittsford 

NY

Monroe 6.96 6 430611 773201 1991-2001 07-08-98 459 65.9 40

298 0423205010 Irondequoit Creek Above Blosm 

Road near Rochester NY

Monroe 142.00 6 430842 773044 1981-05 01-08-98 3,300 23.2 45

299 042320527 Mill Creek Tributary near Webster 

NY

Monroe 1.95 6 431445 772643 1971-72,76-86 09-29-86 211 108.2 25

300 042320578 Bear Creek at Ontario NY Wayne 6.74 6 431330 771700 1971-73,75-99 01-08-98 238 35.3 30301 04232071 Second Creek Tributary at Alton NY Wayne 1.07 6 431236 765932 1970,73,76-86 09-19-86 57 53.3 6302 04232087 Red Creek Tributary No 16 near Red 

Creek NY

Cayuga 2.90 6 431336 764223 1969,76-86 01-31-69 250 86.2 80

303 04232100 Sterling Creek at Sterling NY Cayuga 44.40 6 431931 763851 1958-95 03-22-80 1,760 39.6 >100

304 04232200 Catharine Creek at Montour Falls 

NY

Schuyler 41.10 5 421942 765039 1976-77,87-99 11-08-96 4,700 114.4 30

305 04232460 Sugar Creek at Guyanoga NY Yates 28.90 6 423723 770930 1966-2000 09-23-00 5,000 173.0 >100

306 04232630 Kendig Creek near Macdougall NY Seneca 13.80 6 425057 765333 1966-99 07-31-92 1,000 72.5 40

307 04233000 Cayuga Inlet near Ithaca NY Tompkins 35.20 5 422335 763243 1937-99 06-23-72 4,800 136.4 30308 04233255 Cayuga Inlet at Ithaca NY Tompkins 86.70 5 422538 763119 1971-72,75-99 01-19-96 12,500 144.2 35309 04233258 Coy Glen Creek at Ithaca NY Tompkins 3.56 5 422545 763118 1983-99 01-19-96 820 230.3 15310 04233310 Sixmile Creek near Ithaca NY Tompkins 42.00 5 422433 762714 1967-73,76-86 10-28-81 7,600 181.0 25

64 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

311 04233676 Virgil Creek at Mill Street at 

Dryden NY

Tompkins 20.70 5 422918 761808 1966-72,75-86 10-28-81 4,670 225.6 >100

312 04233700 Virgil Creek at Freeville NY Tompkins 40.30 5 423018 762101 1974-86 10-27-81 7,000 173.7 >100313 04234000 Fall Creek near Ithaca NY Tompkins 126.00 5 422712 762823 1926-05 07-08-35 15,500 123.0 >100314 042340202 Cayuga Lake Tributary Number 8 

near Jacksonville NY

Tompkins 1.36 6 423224 763535 1977-86 02-15-84 144 105.9 7

315 042340588 Yawger Creek Trib near Auburn NY Cayuga 1.76 6 425441 763946 1976-86 11-27-79 88 50.0 11316 04234138 Schaeffer Creek near Canandaigua 

NY

Ontario 7.84 6 425425 772214 1977-99 03-05-79 520 66.3 35

317 04234200 Mud Creek at East Victor NY Ontario 64.20 6 425828 772258 1958-68,72-99 04-21-91 1,880 29.3 12318 04234363 Marbletown Creek Trib near Newark 

NY

Wayne 0.58 6 430247 770257 1976-86 02-17-76 31 53.4 15

319 04234400 West River near Middlesex NY Yates 29.30 6 424106 771719 1965-77 06-23-72 2,000 68.3 15320 04235250 Flint Creek at Phelps NY Ontario 102.00 6 425728 770406 1960-95,02-05 03-30-93 3,170 31.1 30321 04235255 Canandaigua Outlet Tributary near 

Alloway NY

Ontario 2.94 6 430021 770054 1978-99 01-19-96 102 34.7 9

322 04235276 Black Brook at Tyre NY Seneca 19.00 6 425930 764813 1966-95 12-14-77 786 41.4 50323 04240100 Harbor Brook at Syracuse NY Onondaga 10.00 6 430209 761055 1960-99 07-03-74 726 72.6 >100

324 04242500 East Branch Fish Creek at Taberg 

NY

Oneida 188.00 1 431806 753709 1924-95 12-29-84 21,600 114.9 >100

325 04242795 Canada Creek Tributary near Lee 

Center NY

Oneida 1.34 1 431940 753152 1977-86 10-09-76 165 123.1 25

326 04243500 Oneida Creek at Oneida NY Oneida 113.00 6 430551 753822 1950-99 10-09-76 9,110 80.6 40327 04245000 Limestone Creek at Fayetteville NY Onondaga 85.50 6 430148 760049 1940-95 10-28-81 7,490 87.6 50328 04245200 Butternut Creek near Jamesville NY Onondaga 32.20 6 425602 760344 1959-99 07-03-74 2,820 87.6 100329 04245840 Scriba Creek near Constantia NY Oswego 38.40 1 431535 760011 1966-99 09-26-75 1,310 34.1 17330 04249050 Catfish Creek at New Haven NY Oswego 31.70 1 432900 761934 1962-99 03-18-73 1,350 42.6 80

Tables 7–10 65
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

331 042490673 North Branch Grindstone Creek near 

Altmar NY

Oswego 11.20 1 432931 760541 1976-99 03-13-77 482 43.0 10

332 04249200 North Branch Salmon River at 

Redfield NY

Oswego 82.50 1 433232 754851 1962-64,85-99 12-29-84 13,600 164.8 >100

333 04250750 Sandy Creek near Adams NY Jefferson 128.00 1 434848 760430 1958-99 01-19-96 7,700 60.2 12

334 04252500 Black River near Boonville NY Oneida 304.00 1 433042 751825 1911-04 04-18-82 12,800 42.1 50335 04254500 Moose River at Mckeever NY Herkimer 363.00 1 433640 750635 1902-70,85-99 06-03-47 18,700 51.5 >100

336 04256000 Independence River at Donnattsburg 

NY

Lewis 88.70 1 434450 752005 1928-99 12-30-84 9,420 106.2 >100

337 04256040 Tributary To Mill Creek Tributary 

near Lowville NY

Lewis 1.66 1 434543 753113 1976-86,93-99 03-05-78 312 188.0 30

338 04256485 Woods Lake Outlet near Big Moose 

NY

Herkimer 0.80 1 435156 745719 1978-92 12-29-84 90 112.5 60

339 04258700 Deer River at Deer River NY Lewis 94.80 1 435549 753527 1930-99 12-29-84 17,200 181.4 >100

340 04260500 Black River at Watertown NY Jefferson 1,864.00 1 435908 755530 1869,1921-99 01-10-98 55,500 29.8 >100341 04260575 Horse Creek Trib near Dexter NY Jefferson 4.59 1 440447 760328 1976-86 03-13-77 700 152.5 20

342 04262500 West Branch Oswegatchie River near 

Harrisville NY

St Lawrence 244.00 1 441108 751952 1917-99 01-09-98 8,700 35.7 >100

343 04263000 Oswegatchie River near Heuvelton 

NY

St Lawrence 965.00 1 443558 752245 1917-99 04-06-60 19,600 20.3 >100

344 04263445 Birch Creek at Pierces Corners NY St Lawrence 1.56 1 442542 753215 1976-86 04-03-78 85 54.5 8

345 04264300 Brandy Brook near Waddington NY St Lawrence 27.00 1 444942 750932 1959-67,71-86 03-13-77 941 34.9 20346 04264400 Middle Branch Grass River near 

Clare NY

St Lawrence 63.00 1 442233 750340 1959-76,85 04-20-75 3,170 50.3 25

347 04264700 North Branch Grass River near Clare 

NY

St Lawrence 46.30 1 442546 750307 1958-69,85 12-29-84 1,420 30.7 15

348 04265000 Grass River at Pyrites NY St Lawrence 333.00 1 443128 751148 1924-77,85 11-18-27 8,300 24.9 40349 04265100 Elm Creek near Hermon NY St Lawrence 32.60 1 442615 751249 1959-99 04-06-74 1,270 39.0 25350 04265200 Tanner Creek at Stellaville NY St Lawrence 30.30 1 442904 751528 1959-69 06-02-60 1,580 52.1 18

66 Magnitude and Frequency of Floods in New York
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

351 04265300 Little River near Canton NY St Lawrence 42.40 1 443224 750656 1959-76,85 04-05-74 3,300 77.8 35

352 04267600 Cold Brook near South Colton NY St Lawrence 18.70 1 442935 745211 1962-76,85 03-29-63 768 41.1 15353 04267700 Parkhurst Brook near Potsdam NY St Lawrence 16.80 1 443911 745816 1959-77 04-05-74 1,200 71.4 60354 04267800 Trout Brook at Allen Corners NY St Lawrence 54.20 1 444734 750201 1959-86 04-05-74 3,350 61.8 80355 04268200 Plum Brook near Grantville NY St Lawrence 43.90 1 445246 745454 1959-68,71-99 03-30-63 1,920 43.7 100356 04268700 St. Regis River at St. Regis Falls NY Franklin 234.00 1 444021 743254 1958-68,85 12-29-84 4,800 20.5 20357 04268720 Hopkinton Brook at Hopkinton NY St Lawrence 20.00 1 444059 744158 1962-86 12-29-84 804 40.2 10358 04268800 West Branch St. Regis River near 

Parishville NY

St Lawrence 171.00 1 443555 744415 1959-99 12-29-84 5,960 34.9 60

359 04269000 St. Regis River at Brasher Center NY St Lawrence 612.00 1 445149 744645 1911-99 04-06-37 16,800 27.5 70360 04269050 Allen Brook near Brasher Falls NY St Lawrence 16.00 1 444807 744341 1962-86 12-09-80 1,270 79.4 30361 04269100 Lawrence Brook near Moira NY Franklin 25.70 1 445020 743546 1959-64,69-86 08-08-86 1,940 75.5 25362 04269500 Deer River at Brasher Iron Works 

NY

St Lawrence 182.00 1 445332 744128 1913,59-80,85 01-17-13 9,700 53.3 >100

363 04270000 Salmon River at Chasm Falls NY Franklin 132.00 1 444522 741309 1926-85,87-99 12-29-84 3,700 28.0 60

364 04270100 West Branch Deer Creek at Fort 

Covington Center NY

Franklin 32.40 1 445649 742851 1962-74,76-86 04-05-74 2,050 63.3 50

365 04270150 East Branch Deer Creek at Fort 

Covington Center NY

Franklin 23.90 1 445653 742750 1962-74,76-86 03-14-77 1,740 72.8 45

366 04270162 East Branch Little Salmon River near 

Skerry NY

Franklin 7.11 1 444713 742212 1978-93,98 06-20-78 240 33.8 11

367 04270200 Little Salmon River at Bombay NY Franklin 92.20 1 445624 743326 1959-98 03-31-98 3,420 37.1 25368 04270700 Trout River at Trout River NY Franklin 107.00 1 445923 741756 1960-99 07-05-96 6,980 65.2 50369 04270800 English River near Mooers Forks NY Clinton 40.80 1 445832 733949 1960-69,71-79 03-15-74 2,000 49.0 40370 04271815 Little Chazy River near Chazy NY Clinton 50.30 1 445408 732456 1990-2001 11-10-96 2,750 54.7 100

Tables 7–10 67
Table 7.  Location, drainage area, period of record, and maximum known discharge and recurrence interval for rural, unregulated streams in New York, excluding

Long Island.—Continued[Station locations shown in figure 2 as map numbers; mi2, square miles;  ̊ ' ", degrees, minutes, seconds; ft3/s, cubic feet per second; >, greater than]

Maximum known discharge 

and recurrence interval

Map 

number

Station 

number Station name County

Drainage 

area (mi2)

Hydrologic 

region

Latitude 

( ̊/'/" )

Longitude 

( ̊/'/" )

Water years of 

unregulated 

flow record * Date

Discharge 

(ft3/s)

Peak 

runoff 

[(ft3/s)/mi2]

Recurrence 

interval 

(years)

371 04273500 Saranac River at Plattsburgh NY Clinton 608.00 1 444054 732818 1928,44-99 11-09-96 14,400 23.7 >100372 04273700 Salmon River at South Plattsburgh 

NY

Clinton 63.30 1 443824 732943 1960-86,90-99 11-09-96 4,200 66.4 90

373 04273800 Little Ausable River near Valcour 

NY

Clinton 67.80 1 443539 732948 1992-2001 06-27-98 7,210 106.3 >100

374 04274000 West Branch Ausable River near 

Lake Placid NY

Essex 116.00 1 441840 735500 1920-68,83-99 09-22-38 10,800 93.1 >100

375 04275000 East Branch Ausable River at Au 

Sable Forks NY

Essex 198.00 1 442620 734055 1925-99 11-09-96 23,900 120.7 >100

376 04275500 Ausable River near Au Sable Forks 

NY

Clinton 446.00 1 442705 733835 1911-68,90-99 11-09-96 37,400 83.9 >100

377 04276200 Bouquet River at New Russia NY Essex 37.60 1 440951 733630 1949-80 11-26-79 6,400 170.2 >100378 04276500 Bouquet River at Willsboro NY Essex 270.00 1 442130 732350 1924-68,85-99 11-09-96 12,300 45.6 70

379 04276770 Mill Brook at Port Henry NY Essex 27.00 1 440309 732847 1990-2000 01-19-96 1,290 47.8 10380 04276842 Putnam Creek East of Crown Point 

Center NY

Essex 51.60 1 435633 732751 1990-2001 04-17-93 2,500 48.4 16

381 04278300 Northwest Bay Brook near Bolton 

Landing NY

Warren 22.00 1 433948 733614 1966-99 01-19-96 1,950 88.6 50

382 04279400 Poultney River Tributary at East 

Poultney VT

Rutland 1.13 1 433217 731236 1964-78,99 04-14-64 98 86.7 16

383 04280200 Mettawee River Tributary 2 at East 

Ruppert VT

Bennington 1.86 1 431616 730723 1963-74 03-27-63 130 69.9 10

384 04280300 Mettawee River Tributary near 

Pawlet VT

Rutland 2.95 1 431935 731020 1963-74 07-21-67 266 90.2 20

385 04280350 Mettawee River near Pawlet VT Rutland 70.20 1 432214 731300 1985-01 12-17-00 7,080 100.9 50386 04280450 Mettawee River near Middle 

Granville NY

Washington 167.00 1 432750 731705 1977,84,90-01 03-14-77 14,500 86.8 40

387 04292500 Lamoille River at East Georgia VT Franklin 686.00 1 444045 730423 1930-99 04-18-82 23,700 34.5 60388 04292700 Stone Bridge Brook near Georgia 

Plains VT

Franklin 8.45 1 444214 731055 1963-74,90-99 01-19-96 1,030 121.9 >100

68 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

1 01197500

2

Housatonic River near Great Barrington, MA A

282.00 86 2,700 3,130 3,700 5,340 6,600 8,410 9,920 11,600 13,400 16,200

2,620 3,140 3,880 6,100 7,970 10,800 13,200 15,900 19,100 23,9002,700 3,130 3,710 5,400 6,740 8,740 10,400 12,300 14,400 17,700

2 01199000

2

Housatonic River at Falls Village, CT A

634.00 87 4,490 5,220 6,220 9,210 11,600 15,300 18,400 22,000 26,000 32,200

4,500 5,300 6,430 9,690 12,300 16,200 19,500 23,200 27,400 33,7004,490 5,220 6,230 9,250 11,700 15,400 18,600 22,200 26,200 32,500

3 01199050

2

Salmon Creek at Lime Rock, CT A

29.40 38 348 440 576 1,080 1,570 2,450 3,340 4,470 5,930 8,490

332 403 507 839 1,130 1,590 2,000 2,480 3,040 3,910346 436 569 1,040 1,480 2,220 2,950 3,840 4,970 6,910

4 01199400

2

Webatuck Creek near South Amenia, NY B

81.00 15 950 1,130 1,390 2,200 2,900 4,000 4,990 6,160 7,540 9,730

900 1,080 1,340 2,130 2,780 3,760 4,590 5,540 6,620 8,260938 1,120 1,380 2,180 2,850 3,890 4,780 5,830 7,030 8,890

5 01199420

2

Tenmile River near Wassaic, NY B

120.00 16 1,600 1,940 2,390 3,600 4,490 5,690 6,640 7,650 8,710 10,200

1,400 1,670 2,070 3,250 4,230 5,680 6,910 8,310 9,890 12,3001,550 1,880 2,320 3,490 4,390 5,690 6,770 8,000 9,350 11,400

6 01199477

2

Stony Brook near Dover Plains, NY

1.93 24 75 94 122 218 306 454 594 767 977 1,330

58 73 94 160 217 302 376 459 552 69372 91 118 204 280 399 508 636 790 1,040

7 01200000

2

Tenmile River near Gaylordsville, CT A

203.00 67 1,830 2,290 2,940 5,070 6,940 9,950 12,700 16,000 19,900 26,200

2,250 2,680 3,290 5,060 6,520 8,640 10,400 12,400 14,700 18,0001,860 2,310 2,960 5,070 6,880 9,730 12,300 15,300 18,800 24,300

Tables 7–10 69
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

8 01200500

2

Housatonic River at Gaylordsville, CT A

996.00 86 7,230 8,720 10,700 16,700 21,400 28,400 34,300 41,000 48,400 59,600

6,710 7,840 9,450 14,000 17,600 22,800 27,100 32,000 37,400 45,6007,200 8,680 10,600 16,500 21,000 27,600 33,200 39,500 46,400 56,900

9 01208990

2

Saugatuck River near Redding, CT A

21.00 38 382 491 646 1,160 1,620 2,360 3,050 3,860 4,820 6,360

331 410 525 889 1,210 1,690 2,130 2,630 3,210 4,120376 482 634 1,120 1,530 2,180 2,780 3,470 4,290 5,590

10 01209700

2

Norwalk River at South Wilton , CT A

30.00 33 669 855 1,120 2,030 2,850 4,200 5,460 6,970 8,790 11,800

458 564 719 1,200 1,620 2,260 2,820 3,470 4,220 5,380642 822 1,070 1,880 2,560 3,630 4,610 5,750 7,130 9,370

11 01311992

1

Arbutus Pond Outlet near Newcomb, NY

1.22 11 14 17 20 28 34 42 47 53 59 68

24 29 35 50 62 77 88 100 111 12915 19 22 34 43 55 64 74 83 96

12 01312000

1

Hudson River near Newcomb, NY

192.00 74 2,870 3,240 3,710 4,930 5,770 6,890 7,760 8,660 9,600 10,900

3,260 3,840 4,570 6,500 7,840 9,540 10,800 12,200 13,400 15,4002,880 3,260 3,730 5,000 5,900 7,120 8,060 9,040 10,000 11,400

13 01313500 

1

Cedar River below Chain Lakes near Indian Lake, NY

160.00 36 2,760 3,180 3,690 4,940 5,760 6,790 7,550 8,310 9,070 10,100

2,200 2,550 2,970 4,100 4,880 5,860 6,580 7,410 8,110 9,2302,730 3,150 3,650 4,860 5,650 6,640 7,370 8,130 8,870 9,910

14 01314000

1

Hudson River at Gooley near Indian Lake, NY

419.00 52 6,360 7,210 8,200 10,500 12,000 13,700 14,900 16,100 17,300 18,800

5,520 6,390 7,460 10,300 12,200 14,600 16,400 18,400 20,100 22,9006,330 7,180 8,170 10,500 12,000 13,800 15,100 16,400 17,700 19,500

70 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

15 01315500

1

Hudson River at North Creek, NY

792.00 92 10,000 11,500 13,300 17,600 20,500 24,000 26,700 29,300 31,900 35,400

9,830 11,300 13,100 17,900 21,200 25,300 28,200 31,700 34,500 39,200

10,000 11,500 13,300 17,600 20,500 24,100 26,800 29,500 32,100 35,800

16 01317000

1

Schroon River at Riverbank, NY

527.00 76 3,590 4,180 4,900 6,650 7,770 9,150 10,200 11,100 12,100 13,400

4,660 5,370 6,220 8,460 9,980 11,900 13,300 14,900 16,200 18,4003,620 4,210 4,940 6,730 7,910 9,380 10,500 11,500 12,600 14,000

17 01318500

1

Hudson River at Hadley, NY

1,664.00 78 15,300 17,600 20,300 26,800 31,100 36,300 40,200 44,000 47,800 52,900

14,800 16,900 19,400 25,800 30,100 35,600 39,600 44,200 47,900 54,00015,300 17,600 20,300 26,800 31,000 36,200 40,100 44,000 47,800 53,000

18 01319000

1

East Branch Sacandaga River at Griffin, NY

114.00 45 2,940 3,470 4,160 5,960 7,230 8,930 10,300 11,600 13,100 15,100

2,030 2,370 2,800 3,950 4,750 5,780 6,530 7,400 8,140 9,3202,900 3,420 4,100 5,810 6,980 8,510 9,730 10,900 12,200 14,100

19 01319800

1

West Branch Sacandaga River at Arietta, NY

28.90 23 886 1,010 1,170 1,520 1,740 1,990 2,180 2,350 2,520 2,740

718 834 981 1,370 1,650 2,000 2,270 2,570 2,830 3,250872 996 1,150 1,500 1,720 1,990 2,200 2,410 2,610 2,890

20 01319950

1

Sand Lake Outlet near Piseco, NY

6.62 23 187 226 274 393 472 570 643 714 785 879

178 206 240 334 400 486 550 622 687 790186 224 271 385 459 551 619 689 757 853

21 01321000

1

Sacandaga River near Hope, NY

491.00 88 9,910 11,300 13,100 17,600 20,800 24,900 28,200 31,500 34,900 39,700

8,050 9,250 10,700 14,600 17,200 20,600 23,100 25,900 28,300 32,2009,860 11,300 13,000 17,500 20,600 24,600 27,800 31,000 34,300 38,900

Tables 7–10 71
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

22 01325000

1

Sacandaga River at Stewarts Bridge near Hadley, NY D

1,055.00 22 12,200 13,700 15,600 20,400 23,800 28,200 31,600 35,100 38,800 43,900

10,100 11,300 12,700 16,400 18,900 22,200 24,500 27,200 29,400 33,00012,000 13,500 15,300 19,800 22,900 26,800 29,700 32,800 36,000 40,500

23 01326500

1

Hudson River at Spier Falls, NY D

2,779.00 23 29,500 32,100 35,400 44,000 50,000 58,100 64,400 70,900 77,800 87,500

24,800 28,100 31,900 42,000 48,700 57,200 63,300 70,500 76,200 85,70029,100 31,800 35,100 43,700 49,800 57,900 64,100 70,800 77,300 87,000

24 01328000

1

Bond Creek at Dunham Basin, NY

14.10 35 507 587 685 926 1,080 1,280 1,430 1,570 1,720 1,920

345 418 513 775 966 1,220 1,410 1,630 1,840 2,160497 578 676 912 1,070 1,270 1,430 1,580 1,750 1,970

25 01328758

1

Pecks Creek at Fort Miller, NY

2.38 12 119 133 149 189 216 249 274 299 324 358

84 103 127 197 250 321 377 440 500 592

114 128 146 191 226 275 315 358 401 463

26 01329000

1

Batten Kill at Arlington, VT A

152.00 56 2,390 2,770 3,270 4,680 5,770 7,310 8,590 10,000 11,500 13,800

4,060 4,700 5,490 7,610 9,120 11,100 12,500 14,200 15,700 18,0002,450 2,840 3,350 4,860 6,050 7,730 9,080 10,600 12,100 14,400

27 01329154

1

Steele Brook at Shushan, NY

2.85 21 42 51 65 102 131 173 207 244 285 344

89 108 132 200 251 318 370 429 483 56746 56 71 117 155 209 252 299 346 415

28 01329500

1

Batten Kill at Battenville, NY

394.00 61 4,270 4,990 5,950 8,750 11,000 14,200 16,900 19,900 23,300 28,400

6,680 7,720 9,000 12,400 14,800 17,800 20,100 22,700 24,900 28,5004,350 5,080 6,050 8,950 11,300 14,600 17,300 20,300 23,500 28,400

72 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

29 01329780

1

Sessions Brook at Porters Corners, NY

1.04 19 18 22 27 43 55 73 89 106 126 155

25 30 37 55 69 87 101 116 130 15119 23 28 45 58 77 92 109 127 154

30 01329900

1

Glowegee Creek Tributary at Mosherville, NY

1.42 19 58 67 79 109 131 158 180 202 225 256

36 44 54 81 102 129 150 173 194 22756 65 76 105 124 150 171 193 215 246

31 01330000

1

Glowegee Creek at West Milton, NY B

26.00 24 513 600 713 1,020 1,240 1,550 1,790 2,050 2,330 2,720

443 529 640 941 1,150 1,430 1,630 1,860 2,070 2,390507 595 707 1,010 1,220 1,520 1,750 2,000 2,260 2,620

32 01330500

1

Kayaderosseras Creek near West Milton, NY

84.20 70 1,190 1,370 1,600 2,260 2,760 3,470 4,070 4,710 5,420 6,460

1,280 1,520 1,830 2,650 3,220 3,950 4,490 5,100 5,630 6,4701,190 1,370 1,610 2,280 2,790 3,510 4,110 4,750 5,440 6,460

33 01330880

1

Saratoga Lake Tributary near Bemis Heights, NY

2.98 25 63 75 92 150 202 286 366 462 578 769

54 66 82 125 156 197 228 262 294 34362 74 91 147 194 267 332 410 500 649

34 01331400

1

Dry Brook near Adams, MA A

7.67 11 358 406 465 616 719 854 957 1,060 1,170 1,330

274 320 379 539 655 808 925 1,060 1,180 1,370344 393 451 597 699 836 944 1,060 1,170 1,350

35 01331500

1

Hoosic River at Adams, MA A

46.70 68 785 924 1,110 1,690 2,180 2,910 3,550 4,290 5,140 6,470

1,330 1,550 1,830 2,570 3,100 3,790 4,300 4,890 5,420 6,250

802 942 1,130 1,730 2,240 2,990 3,630 4,360 5,170 6,440

Tables 7–10 73
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

36 01332000

1

North Branch Hoosic River at North Adams, MA A

40.90 59 1,560 1,910 2,390 3,900 5,190 7,200 9,010 11,100 13,600 17,400

1,320 1,530 1,800 2,510 3,020 3,690 4,190 4,770 5,270 6,0801,550 1,900 2,370 3,820 5,020 6,830 8,430 10,300 12,500 15,800

37 01332500

1

Hoosic River near Williamstown, MA A

126.00 59 2,730 3,190 3,820 5,720 7,260 9,570 11,600 13,900 16,500 20,400

3,100 3,560 4,120 5,630 6,700 8,090 9,130 10,300 11,400 13,0002,740 3,200 3,830 5,710 7,220 9,420 11,300 13,400 15,800 19,300

38 01333000

1

Green River at Williamstown, MA A

42.60 49 1,040 1,220 1,460 2,130 2,640 3,370 3,980 4,640 5,370 6,440

1,300 1,530 1,820 2,610 3,180 3,920 4,480 5,130 5,700 6,6001,050 1,230 1,470 2,160 2,690 3,440 4,050 4,710 5,420 6,470

39 01333367

1

Little Hoosic River at Cherryplain, NY

2.22 10 96 105 116 141 158 179 194 210 226 247

74 88 107 158 195 246 284 328 367 42892 102 114 146 171 206 234 265 294 337

40 01333500

1

Little Hoosic River at Petersburg, NY

56.10 48 1,400 1,650 1,990 2,990 3,790 4,980 6,010 7,160 8,460 10,400

1,390 1,660 2,010 2,950 3,630 4,510 5,170 5,930 6,600 7,6501,400 1,650 1,990 2,990 3,770 4,920 5,890 6,970 8,160 9,930

41 01333900

1

Paran Creek near South Shaftsbury, VT A

2.38 15 47 59 75 123 160 212 255 301 351 424

108 128 154 226 279 351 407 471 530 620

54 67 85 143 190 256 308 364 420 502

42 01334000

1

Walloomsac River near North Bennington, VT A

111.00 69 2,270 2,720 3,300 4,870 5,990 7,510 8,710 9,970 11,300 13,200

3,380 3,960 4,700 6,690 8,100 9,950 11,300 12,900 14,300 16,6002,300 2,750 3,340 4,960 6,140 7,730 8,980 10,300 11,700 13,600

74 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

43 01334500

1

Hoosic River near Eagle Bridge, NY

510.00 88 8,250 9,580 11,400 16,900 21,500 28,400 34,500 41,400 49,400 61,800

8,670 9,870 11,300 15,100 17,800 21,300 23,900 26,900 29,400 33,5008,260 9,590 11,400 16,800 21,300 27,900 33,600 40,100 47,500 59,000

44 01335500

1

Hudson River at Mechanicville, NY AD

4,500.00 42 32,400 35,600 39,800 52,000 61,300 74,600 85,700 97,900 111,000 131,000

36,200 40,500 45,400 58,500 67,200 78,400 86,400 96,100 104,000 116,00032,600 35,800 40,100 52,500 61,900 75,100 85,800 97,600 110,000 128,000

45 01342730

1

Steele Creek at Ilion, NY

26.20 19 418 560 753 1,290 1,680 2,200 2,600 3,010 3,420 3,980

939 1,130 1,370 2,040 2,530 3,190 3,690 4,270 4,800 5,620472 615 814 1,410 1,860 2,460 2,920 3,410 3,880 4,540

46 01342797

1

Vly Brook near Morehouseville, NY

3.28 10 116 142 174 262 325 409 474 542 613 712

90 104 122 171 205 251 285 323 357 411

111 136 165 238 285 344 390 439 489 563

47 01342800

1

West Canada Creek at Nobleboro, NY

193.00 32 6,770 7,550 8,480 10,800 12,300 14,200 15,600 17,000 18,400 20,300

4,320 4,930 5,670 7,650 9,020 10,800 12,100 13,600 14,900 16,9006,610 7,400 8,310 10,500 11,800 13,600 14,900 16,300 17,600 19,500

48 01346820

1

Mohawk River Tributary at Indian Castle, NY

1.36 13 61 70 81 112 135 166 191 218 247 288

52 62 77 118 148 190 222 258 293 34560 69 81 114 139 174 203 234 266 312

49 01347460

1

Spruce Lake Tributary near Salisbury Center, NY

0.54 13 31 36 43 61 72 87 98 110 121 137

19 22 27 39 48 60 69 80 90 10429 34 41 56 65 78 87 98 108 123

Tables 7–10 75
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

50 01348000

1

East Canada Creek at East Creek, NY B

289.00 75 6,750 7,590 8,630 11,300 13,200 15,600 17,400 19,400 21,300 24,100

5,740 6,610 7,680 10,500 12,400 14,900 16,800 18,900 20,700 23,6006,720 7,560 8,600 11,300 13,100 15,500 17,300 19,300 21,200 24,000

51 01348420

1

North Creek near Ephratah, NY

6.52 26 169 204 248 364 443 546 624 704 785 896

144 172 210 311 384 480 552 632 705 818167 202 245 357 433 532 607 686 764 875

52 01349000

1

Otsquago Creek at Fort Plain, NY

61.00 40 3,170 3,830 4,660 6,840 8,360 10,300 11,900 13,400 15,000 17,200

2,510 3,030 3,700 5,550 6,920 8,770 10,200 11,900 13,400 15,8003,140 3,790 4,610 6,730 8,200 10,100 11,600 13,100 14,700 16,900

53 01349150

1

Canajoharie Creek near Canajoharie, NY

59.70 10 1,930 2,240 2,610 3,520 4,100 4,810 5,340 5,850 6,370 7,040

1,900 2,270 2,740 4,020 4,960 6,220 7,190 8,310 9,320 10,9001,920 2,250 2,630 3,650 4,390 5,390 6,160 7,000 7,800 8,950

54 01349360

1

Van Wie Creek Tributary near Randall, NY

1.00 12 62 73 89 132 164 208 244 282 324 383

36 44 55 85 108 139 163 191 217 25658 69 84 121 147 183 212 243 277 326

55 01349700

3

East Kill near Jewett Center, NY B

35.60 10 1,980 2,650 3,620 6,730 9,370 13,400 16,900 20,900 25,400 32,200

1,440 1,800 2,340 3,880 5,160 6,990 8,630 10,400 12,300 15,0001,800 2,260 3,170 5,220 6,590 8,380 9,920 11,600 13,500 16,200

56 01350000

3

Schoharie Creek at Prattsville, NY

237.00 90 8,430 10,900 14,500 25,200 33,900 46,800 57,700 69,900 83,400 104,000

8,130 10,100 13,200 21,800 28,900 38,700 47,500 57,000 67,600 82,4008,410 10,800 14,400 24,800 33,000 44,500 53,900 64,000 75,100 91,300

76 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

57 01350080

3

Manor Kill at West Conesville near Gilboa, NY

32.40 13 899 1,180 1,570 2,870 3,990 5,750 7,320 9,150 11,300 14,600

803 1,030 1,390 2,480 3,410 4,780 6,040 7,430 9,000 11,300872 1,120 1,520 2,690 3,640 5,040 6,290 7,680 9,260 11,600

58 01350120

3

Platter Kill at Gilboa, NY

10.90 24 124 171 240 489 724 1,120 1,490 1,950 2,510 3,410

231 301 412 756 1,060 1,520 1,950 2,440 2,990 3,790143 204 272 574 874 1,360 1,810 2,320 2,900 3,730

59 01350140

3

Mine Kill near North Blenheim, NY

16.20 25 544 677 850 1,330 1,670 2,140 2,520 2,900 3,310 3,880

454 577 758 1,300 1,750 2,410 3,000 3,630 4,340 5,310529 652 834 1,320 1,700 2,300 2,850 3,450 4,140 5,080

60 01350900

3

Beaverdam Creek near Knox, NY

6.91 23 221 281 365 630 853 1,200 1,500 1,850 2,240 2,860

140 182 246 443 616 877 1,120 1,380 1,680 2,100207 255 343 569 745 1,000 1,230 1,490 1,780 2,220

61 01351000

3

Fox Creek at West Berne, NY B

67.20 20 1,950 2,410 3,040 4,760 6,040 7,790 9,190 10,700 12,200 14,500

1,310 1,680 2,250 3,990 5,450 7,570 9,470 11,500 13,900 17,2001,820 2,190 2,870 4,480 5,750 7,650 9,390 11,300 13,600 16,800

62 01354300

1

Plotter Kill at Rynex Corners, NY

3.70 26 165 196 237 351 439 564 668 780 904 1,090

79 97 120 186 233 296 344 398 447 524

159 189 228 331 405 508 591 684 783 935

63 01355405

1

Indian Kill near Glenville Center, NY

3.11 17 67 79 95 142 180 235 282 334 393 481

70 86 107 167 211 269 313 363 409 47967 80 96 147 187 245 292 344 398 480

Tables 7–10 77
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

64 01358500

2

Poesten Kill near Troy, NY

89.40 45 1,620 1,860 2,210 3,370 4,420 6,140 7,760 9,720 12,100 16,100

1,200 1,430 1,760 2,750 3,600 4,880 5,980 7,230 8,630 10,7001,580 1,820 2,170 3,280 4,270 5,850 7,300 9,020 11,100 14,400

65 01359519

2

Normans Kill near Westmere, NY

131.00 25 2,730 3,230 3,880 5,690 7,050 8,940 10,500 12,200 13,900 16,600

2,110 2,500 3,050 4,670 6,000 7,950 9,560 11,400 13,300 16,2002,630 3,120 3,760 5,460 6,750 8,590 10,100 11,900 13,600 16,400

66 01359528

2

Normans Kill at Albany, NY

168.00 26 3,450 4,120 4,990 7,470 9,370 12,100 14,300 16,700 19,400 23,200

2,410 2,840 3,440 5,190 6,600 8,610 10,300 12,100 14,100 16,9003,290 3,940 4,770 6,970 8,600 10,900 12,800 14,800 17,200 20,500

67 01359750

2

Moordener Kill at Castleton-on-Hudson, NY

32.60 38 475 560 670 966 1,180 1,470 1,700 1,940 2,190 2,550

564 672 824 1,290 1,680 2,260 2,750 3,290 3,890 4,790485 572 686 1,020 1,280 1,680 2,010 2,370 2,750 3,320

68 01359902

2

Coeymans Creek near Selkirk, NY

35.10 10 1,380 1,530 1,720 2,260 2,670 3,260 3,750 4,290 4,880 5,760

987 1,210 1,530 2,500 3,320 4,520 5,530 6,660 7,910 9,760

1,250 1,430 1,660 2,360 3,000 3,990 4,840 5,800 6,860 8,430

69 01359924

2

Hannacrois Creek near New Baltimore, NY

61.60 10 891 1,010 1,170 1,630 1,990 2,520 2,960 3,460 4,020 4,860

930 1,120 1,380 2,200 2,900 3,960 4,870 5,900 7,070 8,840904 1,040 1,230 1,870 2,450 3,350 4,130 5,020 6,010 7,520

70 01360640

2

Valatie Kill near Nassau, NY

9.48 10 262 315 387 600 768 1,010 1,220 1,450 1,710 2,090

219 265 332 538 712 970 1,190 1,440 1,710 2,120248 300 371 574 740 987 1,200 1,440 1,710 2,110

78 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

71 01361000

2

Kinderhook Creek at Rossman, NY

329.00 54 3,820 4,520 5,490 8,670 11,500 15,900 20,000 24,900 30,800 40,200

4,270 5,000 6,030 9,020 11,500 15,000 17,900 21,200 24,700 29,9003,860 4,560 5,530 8,710 11,500 15,700 19,500 24,000 29,200 37,400

72 01361200

2

Claverack Creek at Claverack, NY

60.60 24 1,120 1,410 1,800 2,960 3,880 5,230 6,380 7,650 9,060 11,200

1,100 1,310 1,600 2,510 3,270 4,400 5,360 6,420 7,610 9,3501,120 1,390 1,770 2,860 3,700 4,930 5,980 7,130 8,420 10,400

73 01361453

2

Catskill Creek Tributary at Franklinton, NY

3.61 19 100 124 159 272 370 527 670 840 1,040 1,360

124 153 194 320 427 582 714 858 1,020 1,250105 130 166 285 390 550 690 849 1,030 1,300

74 01361500

2

Catskill Creek at Oak Hill, NY

98.00 81 2,470 3,150 4,070 6,710 8,720 11,600 13,900 16,300 19,000 22,800

2,170 2,610 3,230 5,100 6,680 9,000 11,000 13,100 15,500 19,0002,450 3,120 4,030 6,580 8,490 11,200 13,400 15,700 18,300 22,000

75 01361570

2

Tenmile Creek at Oak Hill, NY B

35.30 10 727 875 1,080 1,730 2,280 3,130 3,890 4,780 5,810 7,430

753 918 1,150 1,890 2,510 3,450 4,260 5,170 6,190 7,730735 888 1,100 1,800 2,400 3,310 4,120 5,030 6,060 7,630

76 01361900

2

Shingle Kill at Cairo, NY

13.90 20 657 807 1,020 1,710 2,310 3,270 4,150 5,200 6,450 8,450

552 701 919 1,600 2,190 3,060 3,820 4,670 5,620 7,070637 788 1,000 1,680 2,270 3,190 4,000 4,950 6,050 7,760

77 01362100

2

Roeliff Jansen Kill near Hillsdale, NY

27.50 42 521 611 736 1,130 1,460 1,990 2,460 3,010 3,650 4,680

722 890 1,130 1,870 2,500 3,420 4,210 5,100 6,090 7,580542 637 773 1,240 1,660 2,340 2,940 3,630 4,410 5,620

Tables 7–10 79
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

78 01362197

2

Bushnellsville Creek at Shandaken, NY

11.40 26 195 261 359 695 1,000 1,510 1,980 2,540 3,210 4,290

510 653 863 1,520 2,090 2,930 3,660 4,480 5,400 6,790244 317 432 876 1,300 2,000 2,620 3,320 4,130 5,380

79 01362200

2

Esopus Creek at Allaben, NY

63.70 42 1,840 2,540 3,590 7,200 10,500 15,800 20,600 26,400 33,100 43,800

2,670 3,410 4,470 7,800 10,600 14,900 18,500 22,600 27,200 34,1001,930 2,620 3,670 7,290 10,500 15,600 20,000 25,300 31,300 40,700

80 01362500

2

Esopus Creek at Coldbrook, NY

192.00 74 7,550 10,100 13,800 26,000 36,800 53,900 69,400 87,500 109,000 142,000

6,500 8,160 10,500 17,700 23,800 32,800 40,400 48,900 58,400 72,5007,490 9,990 13,600 25,300 35,200 50,600 64,300 80,100 98,700 127,000

81 01365000

2

Rondout Creek near Lowes Corners, NY

38.30 64 1,670 2,110 2,690 4,340 5,570 7,260 8,630 10,100 11,600 13,800

1,670 2,140 2,830 4,980 6,820 9,580 12,000 14,600 17,700 22,2001,670 2,110 2,700 4,410 5,740 7,670 9,300 11,100 13,000 15,800

82 01365500

2

Chestnut Creek at Grahamsville, NY

20.90 50 698 905 1,200 2,110 2,870 4,030 5,030 6,170 7,460 9,410

643 807 1,040 1,790 2,420 3,380 4,210 5,150 6,200 7,810693 898 1,190 2,070 2,790 3,890 4,830 5,900 7,110 8,950

83 01366500

2

Rondout Creek near Lackawack, NY D

100.00 19 2,830 3,600 4,700 8,340 11,600 16,700 21,400 27,000 33,600 44,200

2,970 3,710 4,780 8,070 10,900 15,000 18,500 22,500 27,000 33,7002,860 3,620 4,720 8,270 11,400 16,000 20,100 24,800 30,300 38,800

84 01366650

2

Sandburg Creek at Ellenville, NY

52.80 21 1,160 1,470 1,880 3,010 3,830 4,930 5,800 6,700 7,640 8,950

1,320 1,630 2,080 3,450 4,610 6,330 7,810 9,480 11,300 14,2001,190 1,500 1,910 3,120 4,080 5,480 6,660 7,970 9,370 11,500

80 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

85 01367500

2

Rondout Creek at Rosendale, NY D

383.00 28 8,980 10,400 12,300 17,800 22,000 28,100 33,200 38,800 45,100 54,400

6,550 7,930 9,890 15,600 20,100 26,700 32,200 38,300 45,000 55,0008,620 10,100 12,000 17,300 21,500 27,600 32,800 38,600 45,100 54,700

86 01368000

2

Wallkill River near Unionville, NY A

140.00 49 1,290 1,450 1,680 2,370 2,930 3,780 4,520 5,370 6,340 7,830

1,560 1,870 2,300 3,600 4,690 6,310 7,700 9,270 11,000 13,7001,310 1,480 1,730 2,530 3,230 4,330 5,300 6,400 7,640 9,540

87 01368500

2

Rutgers Creek at Gardnerville, NY

59.70 36 1,140 1,300 1,530 2,270 2,910 3,920 4,850 5,940 7,240 9,330

988 1,190 1,470 2,330 3,040 4,080 4,960 5,940 7,040 8,670

1,120 1,290 1,520 2,280 2,940 3,960 4,880 5,940 7,170 9,090

88 01369000

2

Pochuck Creek near Pine Island, NY A

98.00 40 875 1,010 1,190 1,710 2,120 2,710 3,210 3,760 4,380 5,300

1,160 1,390 1,730 2,740 3,610 4,900 6,020 7,300 8,750 11,000

906 1,050 1,240 1,870 2,420 3,270 4,010 4,840 5,780 7,210

89 01369500

2

Quaker Creek at Florida, NY

9.74 42 258 306 369 550 691 892 1,060 1,250 1,450 1,750

147 178 224 366 490 679 845 1,030 1,250 1,590246 294 355 523 652 840 1,000 1,190 1,390 1,700

90 01370000

2

Wallkill River at Pellets Island, NY A

380.00 54 3,050 3,470 4,010 5,540 6,700 8,350 9,710 11,200 12,800 15,200

3,840 4,520 5,490 8,300 10,600 14,000 16,800 19,900 23,400 28,6003,110 3,550 4,120 5,870 7,310 9,490 11,300 13,300 15,500 18,800

91 01370500

2

Wallkill River near Phillipsburg, NY A

406.00 29 3,970 4,470 5,090 6,680 7,780 9,230 10,400 11,500 12,700 14,400

3,900 4,580 5,540 8,290 10,500 13,700 16,400 19,300 22,600 27,5003,960 4,480 5,150 7,000 8,480 10,700 12,500 14,400 16,600 19,800

Tables 7–10 81
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

92 01371000

2

Shawangunk Kill at Pine Bush, NY

104.00 26 2,110 2,610 3,260 5,000 6,250 7,910 9,210 10,600 11,900 13,900

1,760 2,110 2,610 4,080 5,270 7,000 8,440 10,000 11,800 14,4002,060 2,540 3,170 4,800 5,980 7,600 8,920 10,400 11,900 14,100

93 01371400

2

Shawangunk Kill at Ganahgote, NY B

147.00 10 2,900 3,660 4,690 7,520 9,610 12,500 14,700 17,100 19,600 23,100

2,250 2,680 3,300 5,070 6,490 8,530 10,200 12,100 14,100 17,1002,690 3,370 4,270 6,490 8,040 10,200 11,900 13,900 16,000 19,100

94 01371500

2

Wallkill River at Gardiner, NY A

695.00 75 7,950 9,100 10,600 14,600 17,600 21,700 25,000 28,500 32,300 37,800

6,380 7,430 8,900 13,000 16,300 21,000 24,700 28,900 33,600 40,3007,860 9,010 10,500 14,500 17,400 21,600 24,900 28,600 32,600 38,300

95 01372040

2

Crum Elbow Creek at Hyde Park, NY

17.30 17 157 195 246 405 536 734 907 1,100 1,330 1,670

279 335 416 662 869 1,180 1,440 1,730 2,060 2,550184 223 281 482 660 932 1,160 1,420 1,710 2,150

96 01372200

2

Wappinger Creek near Clinton Corners, NY B

92.40 26 935 1,150 1,480 2,630 3,730 5,630 7,510 9,890 12,900 18,000

1,280 1,520 1,870 2,890 3,720 4,940 5,960 7,090 8,350 10,200

989 1,200 1,540 2,690 3,730 5,390 6,920 8,760 11,000 14,600

97 01372300

2

Little Wappinger Creek at Salt Point, NY B

32.90 19 318 395 504 845 1,130 1,580 1,980 2,430 2,960 3,790

512 617 766 1,220 1,600 2,170 2,650 3,190 3,800 4,720357 436 553 949 1,290 1,830 2,280 2,800 3,380 4,270

98 01372500

2

Wappinger Creek near Wappingers Falls, NY

181.00 71 1,700 2,100 2,690 4,740 6,650 9,890 13,000 17,000 21,800 30,000

2,110 2,490 3,020 4,550 5,780 7,550 9,000 10,600 12,400 15,0001,730 2,120 2,710 4,720 6,540 9,510 12,300 15,700 19,800 26,700

82 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

99 01372800

2

Fishkill Creek at Hopewell Junction, NY

57.30 30 520 662 862 1,500 2,030 2,860 3,600 4,450 5,430 6,940

818 984 1,220 1,940 2,550 3,440 4,210 5,070 6,050 7,520561 702 908 1,590 2,160 3,040 3,810 4,680 5,670 7,170

100 01373500

2

Fishkill Creek at Beacon, NY

190.00 24 1,450 1,760 2,220 3,740 5,120 7,390 9,530 12,100 15,300 20,500

2,210 2,630 3,220 4,950 6,370 8,440 10,200 12,100 14,300 17,5001,580 1,890 2,370 4,020 5,490 7,770 9,800 12,100 14,900 19,100

101 01373690

2

Woodbury Creek near Highland Mills, NY

11.20 13 253 355 511 1,070 1,590 2,450 3,260 4,230 5,390 7,250

271 340 441 762 1,040 1,470 1,840 2,270 2,770 3,530258 352 493 959 1,350 1,950 2,480 3,100 3,840 4,990

102 01374130

2

Canopus Creek at Oscawana Corners, NY

8.30 12 165 192 226 316 379 464 530 598 670 770

198 248 322 555 758 1,070 1,340 1,650 2,000 2,550174 207 252 407 552 786 990 1,220 1,480 1,880

103 01374250

2

Peekskill Hollow Creek at Tompkins Corners, NY

14.90 25 218 282 374 678 948 1,380 1,770 2,240 2,790 3,670

253 313 402 684 932 1,310 1,650 2,050 2,500 3,210224 287 378 680 943 1,360 1,720 2,160 2,670 3,460

104 01374440

2

Cedar Pond Brook at Stony Point, NY

17.30 14 444 559 725 1,290 1,810 2,670 3,490 4,480 5,690 7,690

429 538 698 1,210 1,650 2,320 2,920 3,600 4,380 5,580440 554 719 1,260 1,740 2,500 3,190 3,990 4,940 6,450

105 01384500

2

Ringwood Creek near Wanaque, NJ A

19.10 57 273 332 416 696 947 1,360 1,740 2,210 2,770 3,690

311 385 494 839 1,140 1,610 2,020 2,500 3,050 3,920276 336 421 712 976 1,410 1,800 2,280 2,840 3,750

Tables 7–10 83
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

106 01386000

2

West Brook near Wanaque, NJ A

11.80 43 363 444 552 857 1,090 1,420 1,690 1,980 2,290 2,750

404 512 669 1,170 1,590 2,230 2,790 3,420 4,140 5,230367 451 563 903 1,190 1,610 1,990 2,400 2,850 3,540

107 01387250

2

Ramapo River at Sloatsburg, NY

60.10 10 1,000 1,230 1,550 2,600 3,510 4,950 6,270 7,830 9,680 12,600

979 1,200 1,530 2,540 3,400 4,700 5,840 7,140 8,620 10,900993 1,220 1,540 2,570 3,450 4,810 6,010 7,390 8,990 11,500

108 01387300

2

Stony Brook at Sloatsburg, NY B

18.20 10 398 492 623 1,030 1,370 1,900 2,360 2,900 3,510 4,460

323 403 520 893 1,220 1,730 2,190 2,710 3,330 4,290374 465 591 972 1,290 1,800 2,260 2,780 3,390 4,350

109 01387350

2

Nakoma Brook at Sloatsburg, NY

5.40 19 93 119 157 285 401 591 768 981 1,240 1,650

95 119 155 269 369 525 666 828 1,020 1,32093 119 157 281 390 563 722 908 1,130 1,480

110 01387400

2

Ramapo River at Ramapo, NY B

86.90 20 1,440 1,780 2,270 3,850 5,250 7,490 9,560 12,000 14,900 19,700

1,290 1,580 2,000 3,280 4,370 6,010 7,430 9,050 10,900 13,7001,410 1,740 2,220 3,700 4,950 6,890 8,620 10,600 13,000 16,700

111 01387410

2

Torne Brook at Ramapo, NY

2.60 40 187 244 326 600 842 1,230 1,580 2,000 2,490 3,260

122 157 208 371 510 716 896 1,100 1,320 1,660180 235 314 564 775 1,100 1,390 1,730 2,110 2,720

112 01387420

2

Ramapo River at Suffern, NY B

93.00 20 1,600 1,980 2,530 4,330 5,920 8,500 10,900 13,700 17,100 22,600

1,400 1,710 2,160 3,530 4,690 6,430 7,930 9,650 11,600 14,6001,560 1,930 2,460 4,120 5,510 7,660 9,590 11,800 14,400 18,600

84 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

113 01387450

2

Mahwah River near Suffern, NY

12.30 38 356 442 561 926 1,220 1,670 2,060 2,500 3,000 3,760

327 412 536 929 1,270 1,780 2,230 2,750 3,330 4,240352 439 559 926 1,230 1,700 2,110 2,580 3,110 3,930

114 01387500

2

Ramapo River near Mahwah, NJ A

120.00 88 1,820 2,260 2,900 5,040 6,960 10,100 13,000 16,500 20,800 27,700

1,850 2,260 2,850 4,640 6,150 8,390 10,300 12,500 15,000 18,8001,820 2,260 2,900 5,010 6,880 9,870 12,600 15,800 19,800 26,000

115 01413500

3

East Branch Delaware River at Margaretville, NY

163.00 63 3,750 4,680 5,960 9,810 12,900 17,400 21,300 25,600 30,400 37,600

5,300 6,550 8,410 13,600 17,900 23,700 28,900 34,400 40,400 48,8003,870 4,900 6,150 10,400 14,100 19,700 24,800 30,400 36,600 45,100

116 01414000

3

Platte Kill at Dunraven, NY

34.90 31 1,030 1,250 1,560 2,440 3,140 4,170 5,040 6,000 7,070 8,670

1,050 1,320 1,700 2,800 3,710 4,970 6,060 7,210 8,460 10,2001,030 1,260 1,580 2,540 3,360 4,600 5,690 6,860 8,130 9,900

117 01414500

3

Mill Brook near Dunraven, NY

25.20 63 922 1,150 1,440 2,320 3,000 3,980 4,800 5,700 6,680 8,130

992 1,230 1,570 2,540 3,330 4,430 5,390 6,380 7,460 8,920928 1,160 1,450 2,350 3,080 4,140 5,070 6,070 7,160 8,660

118 01415000 Tremper Kill near 

Andes, NY

33.20 62 830 1,040 1,330 2,120 2,730 3,560 4,230 4,950 5,720 6,810

3 949 1,190 1,510 2,480 3,270 4,350 5,270 6,230 7,270 8,680

839 1,060 1,340 2,180 2,860 3,850 4,720 5,660 6,680 8,070

119 01415500 Terry Clove Kill near 

Pepacton, NY

13.60 26 464 575 728 1,210 1,610 2,230 2,780 3,410 4,140 5,280

3 417 519 653 1,050 1,380 1,820 2,200 2,580 3,000 3,540

457 561 715 1,160 1,510 1,990 2,390 2,790 3,230 3,830

Tables 7–10 85
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

120 01417000

3

East Branch Delaware River at Downsville, NY D

372.00 13 8,040 9,820 12,200 19,300 24,900 33,000 39,900 47,500 55,900 68,400

9,410 11,500 14,500 23,100 29,800 38,900 46,700 55,000 64,000 76,4008,430 10,500 12,900 21,100 27,800 37,300 45,400 53,900 63,100 75,700

121 01417185

3

Campbell Brook Tributary near Downsville, NY

0.41 12 12 15 20 36 48 67 82 99 118 145

13 17 21 34 45 61 75 89 104 12412 16 20 35 46 62 76 90 105 125

122 01417500

3

East Branch Delaware River at Harvard, NY D

458.00 20 9,370 11,500 14,400 22,500 28,600 37,400 44,500 52,200 60,600 72,800

10,400 12,700 15,800 24,600 31,600 40,800 48,800 57,100 66,100 78,500

9,580 11,900 14,700 23,300 30,100 39,600 47,600 56,100 65,200 77,700

123 01418000

3

Beaver Kill near Turnwood, NY B

40.80 11 1,790 2,230 2,820 4,500 5,770 7,560 9,020 10,600 12,300 14,700

2,040 2,480 3,090 4,760 6,080 7,850 9,340 10,900 12,500 14,6001,870 2,340 2,910 4,630 5,970 7,780 9,290 10,900 12,500 14,600

124 01418500

3

Beaver Kill at Craigie Clair, NY

81.90 40 2,680 3,300 4,140 6,510 8,330 10,900 13,000 15,300 17,700 21,300

3,310 4,030 4,990 7,700 9,820 12,600 15,000 17,300 19,900 23,2002,750 3,430 4,240 6,770 8,820 11,700 14,200 16,600 19,300 22,700

125 01419500

3

Willowemoc Creek near Livingston, Manor, NY

62.60 37 2,090 2,560 3,200 5,100 6,610 8,830 10,700 12,800 15,200 18,700

2,640 3,230 4,020 6,240 7,980 10,300 12,300 14,300 16,400 19,2002,160 2,680 3,300 5,370 7,080 9,560 11,700 13,800 16,100 19,100

126 01420000

3

Little Beaver Kill near Livingston, Manor, NY

20.10 57 828 1,030 1,300 2,050 2,600 3,350 3,950 4,570 5,240 6,170

795 977 1,220 1,910 2,470 3,220 3,860 4,510 5,190 6,090825 1,020 1,290 2,030 2,570 3,300 3,910 4,540 5,210 6,110

86 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

127 01420500

3

Beaver Kill at Cooks Falls, NY

241.00 92 7,000 8,800 11,300 18,500 24,300 32,800 39,900 47,800 56,600 69,500

8,070 9,860 12,200 19,000 24,200 30,900 36,600 42,400 48,500 56,6007,060 8,890 11,300 18,600 24,300 32,300 38,700 45,300 52,400 62,000

128 01421000

3

East Branch Delaware River at Fishs Eddy, NY D

784.00 43 16,800 20,300 24,700 36,500 45,100 56,500 65,500 75,000 84,900 98,700

17,700 21,300 26,200 40,000 50,800 64,600 76,300 88,600 102,000 119,00016,900 20,500 24,900 37,200 46,900 60,200 71,500 83,700 96,900 114,000

129 01421900

4

West Branch Delaware River upstream from Delhi, NY

134.00 42 2,760 3,270 3,910 5,550 6,670 8,130 9,230 10,400 11,500 13,100

2,890 3,450 4,150 5,980 7,240 8,890 10,100 11,400 12,700 14,4002,770 3,280 3,920 5,590 6,750 8,270 9,430 10,700 11,800 13,500

130 01422500

4

Little Delaware River near Delhi, NY

49.80 41 1,440 1,730 2,110 3,050 3,690 4,500 5,110 5,710 6,330 7,150

1,490 1,780 2,130 3,060 3,690 4,530 5,160 5,810 6,470 7,3201,440 1,730 2,110 3,050 3,690 4,510 5,120 5,740 6,370 7,200

131 01423000

4

West Branch Delaware River at Walton, NY

332.00 49 6,320 7,730 9,510 14,100 17,200 21,200 24,200 27,200 30,300 34,400

6,220 7,360 8,770 12,400 14,900 18,100 20,600 23,000 25,500 28,6006,310 7,710 9,470 14,000 16,900 20,700 23,500 26,200 29,100 32,800

132 01423500

4

Dryden Brook near Granton, NY

8.10 16 219 268 329 484 588 719 817 914 1,010 1,140

273 337 420 653 826 1,060 1,240 1,430 1,630 1,900228 277 341 519 657 850 1,000 1,160 1,330 1,560

133 0142400103

4

Trout Creek near Trout Creek, NY

20.20 20 616 748 915 1,360 1,680 2,100 2,430 2,770 3,120 3,610

587 719 887 1,360 1,700 2,150 2,500 2,870 3,250 3,750613 744 912 1,360 1,680 2,120 2,460 2,810 3,180 3,680

Tables 7–10 87
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

134 01424500

4

Trout Creek at Cannonsville, NY

49.50 23 1,560 1,810 2,120 2,950 3,520 4,290 4,880 5,500 6,140 7,040

997 1,180 1,400 1,930 2,280 2,720 3,050 3,380 3,710 4,130

1,490 1,750 2,050 2,790 3,250 3,820 4,230 4,660 5,100 5,710

135 01425000

4

West Branch Delaware River at Stilesville, NY D

456.00 12 8,320 10,100 12,300 18,100 22,000 27,000 30,800 34,500 38,400 43,500

7,070 8,370 9,980 14,200 17,100 20,900 23,700 26,600 29,400 33,0008,060 9,790 11,900 17,100 20,300 24,200 27,200 30,100 33,100 37,000

136 01425500

4

Cold Spring Brook at China, NY

1.49 34 52 65 81 127 160 204 238 273 310 361

66 83 105 168 217 283 337 393 452 53353 66 83 132 169 222 265 310 357 423

137 01425675

4

Oquaga Creek near North Sanford, NY

4.69 12 155 180 212 292 347 417 471 526 582 659

162 197 240 353 431 533 612 694 777 888156 183 216 308 376 470 543 620 696 800

138 01426000

4

Oquaga Creek at Deposit, NY

67.60 35 1,920 2,300 2,780 4,070 5,000 6,240 7,220 8,240 9,310 10,800

1,380 1,670 2,030 2,980 3,650 4,510 5,170 5,850 6,530 7,4301,880 2,260 2,730 3,950 4,790 5,860 6,680 7,520 8,400 9,600

139 01426500

4

West Branch Delaware River at Hale Eddy, NY D

595.00 51 11,400 13,200 15,500 21,300 25,200 30,200 33,900 37,700 41,500 46,700

9,430 11,100 13,200 18,600 22,300 27,000 30,500 34,100 37,600 42,100

11,300 13,100 15,400 21,100 24,900 29,700 33,200 36,900 40,500 45,400

140 01427500

3

Callicoon Creek at Callicoon, NY

110.00 56 3,000 3,530 4,220 6,170 7,650 9,740 11,500 13,300 15,400 18,400

2,410 3,020 3,830 6,260 8,200 10,800 13,000 15,200 17,700 21,0002,950 3,460 4,190 6,190 7,790 10,200 12,200 14,400 16,900 20,200

88 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

141 01428000

3

Tenmile River at Tusten, NY

45.60 28 727 877 1,090 1,780 2,390 3,360 4,260 5,340 6,620 8,700

866 1,090 1,380 2,280 3,010 3,980 4,810 5,650 6,560 7,780748 926 1,140 1,920 2,640 3,710 4,620 5,570 6,570 7,940

142 01428500

3

Delaware River above Lackawaxen River near Barryville, NY ACD

2,020.00 23 37,500 43,100 50,400 70,300 85,100 106,000 122,000 140,000 159,000 187,000

30,800 36,200 42,900 61,300 74,900 91,700 106,000 120,000 135,000 154,00036,400 41,600 49,200 67,800 81,000 98,200 112,000 126,000 140,000 161,000

143 01428750

3

West Branch Lackawaxen River near Aldenville, PA A

40.60 25 1,410 1,660 1,980 2,790 3,360 4,100 4,660 5,240 5,840 6,670

1,020 1,250 1,500 2,310 2,930 3,710 4,330 4,930 5,550 6,3301,340 1,560 1,890 2,640 3,170 3,870 4,430 5,010 5,610 6,390

144 01434000

3

Delaware River at Port Jervis, NY ACD

3,070.00 59 46,000 54,000 64,500 94,500 118,000 150,000 178,000 207,000 240,000 288,000

43,200 50,800 60,100 85,900 105,000 128,000 147,000 166,000 187,000 214,00045,800 53,700 64,200 93,300 115,000 143,000 165,000 186,000 209,000 240,000

145 0143400680

3

East Branch Neversink River Northeast of Denning, NY

8.93 15 1,260 1,470 1,730 2,380 2,830 3,400 3,840 4,290 4,750 5,380

670 816 1,040 1,630 2,130 2,840 3,470 4,130 4,850 5,810

1,110 1,240 1,550 2,060 2,440 3,000 3,550 4,160 4,840 5,770

146 01434010

3

East Branch Neversink River at Denning, NY

13.30 16 1,740 1,990 2,290 3,050 3,570 4,240 4,750 5,270 5,800 6,530

965 1,180 1,500 2,360 3,060 4,070 4,970 5,910 6,930 8,300

1,550 1,710 2,090 2,760 3,290 4,120 4,920 5,800 6,780 8,100

147 01434017

3

East Branch Neversink River near Claryville, NY B

22.90 15 1,930 2,190 2,500 3,330 3,910 4,680 5,280 5,900 6,540 7,450

1,500 1,830 2,340 3,690 4,790 6,350 7,720 9,170 10,700 12,9001,820 2,060 2,460 3,480 4,410 5,860 7,190 8,640 10,200 12,300

Tables 7–10 89
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

148 01434021

3

West Branch Neversink River at Winnisook Lake near Frost Valley, NY

0.77 10 101 115 132 177 207 247 277 308 340 384

65 78 100 156 204 277 341 409 483 58189 98 121 166 205 270 331 397 470 566

149 01434025

3

Biscuit Brook above Pigeon Brook at Frost Valley, NY

3.72 16 248 287 337 472 570 703 809 922 1,040 1,210

286 347 439 680 882 1,170 1,430 1,690 1,980 2,360257 308 363 558 741 1,030 1,290 1,560 1,850 2,230

150 01434092

3

Shelter Creek below Dry Creek near Frost Valley, NY

0.62 10 44 53 64 95 117 147 171 197 224 262

47 57 73 113 147 199 244 291 342 41045 55 67 105 137 188 233 280 332 399

151 01434498

3

West Branch Neversink River at Claryville, NY

33.80 14 2,570 3,290 4,280 7,180 9,450 12,700 15,400 18,300 21,500 26,200

2,140 2,610 3,300 5,150 6,640 8,700 10,500 12,400 14,400 17,1002,460 3,040 4,010 6,270 7,820 9,820 11,500 13,300 15,300 18,000

152 01435000

3

Neversink River near Claryville, NY

66.60 67 3,800 4,800 6,110 9,800 12,500 16,200 19,200 22,400 25,700 30,300

3,910 4,780 6,070 9,540 12,300 16,200 19,500 23,100 26,900 32,0003,810 4,800 6,110 9,760 12,500 16,200 19,300 22,800 26,400 31,400

153 01436000

3

Neversink River at Neversink, NY D

92.60 12 4,680 5,710 7,090 11,000 13,900 18,000 21,400 25,000 28,900 34,600

4,590 5,600 7,100 11,200 14,400 18,800 22,700 26,800 31,100 37,0004,650 5,660 7,090 11,100 14,200 18,600 22,500 26,600 30,900 36,800

154 01436500

3

Neversink River at Woodbourne, NY D

113.00 16 4,820 5,840 7,230 11,400 14,700 19,600 23,800 28,600 33,900 41,900

5,020 6,150 7,780 12,300 15,800 20,700 25,000 29,400 34,200 40,8004,870 5,950 7,370 11,800 15,300 20,400 24,700 29,300 34,200 40,900

90 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

155 01437000

3

Neversink River at Oakland Valley, NY D

223.00 27 5,840 7,150 8,970 14,700 19,600 27,100 33,900 41,700 50,800 65,100

6,770 8,260 10,300 16,100 20,600 26,600 31,800 37,100 42,800 50,4005,990 7,410 9,190 15,100 20,000 26,800 32,500 38,300 44,500 53,000

156 01437500

3

Neversink River at Godeffroy, NY D

307.00 17 6,560 7,970 9,980 16,500 22,100 31,100 39,400 49,200 60,900 79,600

8,240 10,100 12,500 19,500 25,000 32,100 38,000 44,200 50,800 59,6006,950 8,670 10,600 17,700 23,600 31,800 38,300 45,100 52,300 61,900

157 01438500

3

Delaware River at Montague, NJ ACD

3,480.00 27 54,700 63,200 74,300 106,000 130,000 163,000 191,000 222,000 255,000 304,000

50,000 59,200 70,700 104,000 129,000 159,000 184,000 210,000 236,000 273,00054,000 62,300 73,700 105,000 130,000 161,000 186,000 213,000 240,000 278,000

158 01440000

2

Flat Brook near Flatbrookville, NJ A

64.00 76 1,010 1,240 1,550 2,500 3,290 4,470 5,510 6,690 8,030 10,100

1,060 1,290 1,620 2,630 3,470 4,730 5,810 7,020 8,400 10,5001,010 1,240 1,550 2,510 3,310 4,510 5,560 6,750 8,100 10,200

159 01443500

2

Paulins Kill at Blairstown, NJ A

126.00 76 1,260 1,470 1,760 2,600 3,270 4,230 5,050 5,960 6,970 8,500

1,100 1,300 1,590 2,440 3,140 4,170 5,030 6,020 7,130 8,8101,250 1,460 1,750 2,590 3,250 4,220 5,050 5,970 7,000 8,560

160 01496370

4

Mink Creek at Richfield Springs, NY

10.40 18 221 260 308 423 495 582 644 705 764 840

270 319 376 510 593 698 777 858 936 1,040228 268 317 439 521 623 699 774 848 944

161 01496500

4

Oaks Creek at Index, NY

102.00 62 983 1,150 1,360 1,880 2,220 2,650 2,960 3,280 3,590 4,020

1,460 1,690 1,970 2,570 2,940 3,390 3,720 4,060 4,380 4,7801,010 1,170 1,380 1,920 2,290 2,750 3,090 3,430 3,760 4,200

Tables 7–10 91
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

162 01497500

4

Susquehanna River at Colliersville, NY

349.00 48 3,300 3,800 4,390 5,760 6,600 7,610 8,320 9,010 9,670 10,500

3,940 4,570 5,300 7,000 8,040 9,310 10,200 11,200 12,000 13,2003,340 3,840 4,440 5,860 6,770 7,900 8,710 9,530 10,300 11,300

163 01497800

4

Schenevus Creek at Schenevus, NY

54.20 14 553 691 871 1,360 1,720 2,200 2,580 2,970 3,380 3,950

821 995 1,210 1,800 2,210 2,740 3,140 3,550 3,960 4,500601 738 922 1,460 1,880 2,420 2,850 3,270 3,700 4,270

164 01497805

4

Little Elk Creek near Westford, NY

3.73 22 68 84 105 163 206 264 310 358 408 479

88 110 140 228 294 383 454 528 605 71070 87 109 174 226 301 362 427 494 588

165 01498500

4

Charlotte Creek at West Davenport, NY

167.00 38 2,690 3,280 4,040 6,000 7,340 9,070 10,400 11,700 13,100 14,900

2,920 3,480 4,170 5,920 7,100 8,610 9,740 10,900 12,000 13,5002,710 3,290 4,050 5,990 7,300 8,970 10,200 11,500 12,800 14,400

166 01499000

4

Otego Creek near Oneonta, NY

108.00 35 1,860 2,210 2,630 3,660 4,320 5,130 5,720 6,300 6,860 7,600

1,650 1,970 2,360 3,400 4,090 4,980 5,650 6,340 7,010 7,8901,840 2,190 2,610 3,630 4,280 5,100 5,700 6,310 6,910 7,700

167 01500500

4

Susquehanna River at Unadilla, NY

982.00 62 9,800 11,300 13,100 17,500 20,400 23,900 26,500 29,100 31,700 35,100

10,000 11,600 13,500 18,200 21,100 24,700 27,300 30,000 32,500 35,600

9,810 11,300 13,100 17,500 20,500 24,000 26,600 29,300 31,900 35,200

168 01501000

4

Unadilla River near New Berlin, NY

199.00 49 2,740 3,170 3,700 4,930 5,690 6,620 7,280 7,920 8,540 9,350

2,690 3,180 3,770 5,250 6,220 7,460 8,370 9,300 10,200 11,4002,740 3,170 3,700 4,960 5,750 6,760 7,500 8,240 8,970 9,930

92 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

169 01501015

4

Mill Brook at New Berlin, NY

4.64 12 202 237 279 377 438 510 561 610 657 717

109 133 165 250 311 389 451 514 578 664182 218 259 344 393 455 504 557 610 684

170 01501140

4

Wharton Creek Tributary near Edmeston, NY

2.02 11 96 113 135 190 227 275 311 347 385 435

62 76 94 142 176 220 255 291 327 37789 106 127 177 208 249 281 315 350 398

171 01501500

4

Sage Brook near South New Berlin, NY

0.61 36 20 26 35 64 88 124 156 192 232 293

20 26 34 58 77 103 124 147 171 20520 26 35 63 86 120 148 179 212 262

172 01502000

4

Butternut Creek at Morris, NY

59.70 58 1,300 1,600 1,970 2,910 3,530 4,290 4,850 5,400 5,940 6,650

1,190 1,420 1,710 2,460 2,970 3,630 4,130 4,640 5,140 5,8001,290 1,590 1,960 2,880 3,470 4,190 4,720 5,240 5,760 6,440

173 01502500

4

Unadilla River at Rockdale, NY

520.00 68 6,540 7,640 8,940 12,000 13,800 16,100 17,600 19,100 20,500 22,400

5,590 6,560 7,750 10,700 12,700 15,200 17,000 18,800 20,600 22,9006,500 7,600 8,900 11,900 13,700 16,000 17,500 19,000 20,500 22,500

174 01502632

4

Susquehanna River at Bainbridge, NY B

1,610.00 12 18,900 21,700 25,000 32,700 37,600 43,500 47,800 51,900 56,000 61,300

17,300 20,100 23,400 31,300 36,300 42,500 47,000 51,500 55,800 61,20018,600 21,400 24,700 32,300 37,100 43,000 47,400 51,700 55,900 61,200

175 01502701

4

Susquehanna River at Afton, NY B

1,716.00 13 19,700 22,600 26,200 34,600 40,000 46,600 51,400 56,100 60,700 66,800

17,900 20,700 24,100 32,200 37,400 43,800 48,400 53,000 57,400 63,00019,400 22,300 25,900 34,000 39,100 45,400 49,900 54,400 58,800 64,500

Tables 7–10 93
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

176 01502714

4

Ouaquaga Creek near Belden, NY

3.37 12 186 219 260 361 428 513 577 640 704 789

79 98 123 194 246 315 369 426 483 562

164 197 236 318 364 424 470 521 574 649

177 01502731

4

Susquehanna River at Windsor, NY B

1,820.00 12 19,200 22,200 25,900 35,000 40,900 48,300 53,800 59,300 64,700 72,000

18,000 20,900 24,300 32,500 37,700 44,200 48,900 53,600 58,000 63,70019,000 22,000 25,600 34,400 39,800 46,400 51,300 56,100 60,800 66,900

178 01503000

4

Susquehanna River at Conklin, NY A

2,232.00 93 23,600 27,000 31,200 41,000 47,200 54,900 60,400 65,800 71,100 78,100

22,400 26,000 30,200 40,300 46,600 54,600 60,200 65,900 71,400 78,20023,600 27,000 31,200 41,000 47,200 54,900 60,400 65,800 71,100 78,100

179 01503960

4

Electric Light Stream near Morrisville, NY

7.21 11 225 250 280 347 388 438 473 508 541 585

200 243 298 445 548 683 788 897 1,010 1,150220 249 283 374 448 554 641 732 826 946

180 01503980

4

Chenango River at Eaton, NY

24.30 35 543 655 799 1,180 1,460 1,830 2,120 2,420 2,740 3,180

469 558 667 937 1,110 1,340 1,510 1,680 1,850 2,070537 649 790 1,150 1,410 1,720 1,960 2,200 2,450 2,780

181 01505000

4

Chenango River at Sherburne, NY

263.00 68 3,200 3,790 4,490 6,110 7,090 8,240 9,040 9,790 10,500 11,400

3,040 3,580 4,230 5,830 6,850 8,150 9,090 10,000 11,000 12,1003,190 3,780 4,480 6,090 7,070 8,230 9,050 9,830 10,600 11,600

182 01505017

4

Cold Brook near North Norwich, NY

5.80 12 136 158 183 242 278 321 351 379 407 442

155 191 239 371 468 598 701 807 916 1,060140 164 193 276 345 446 530 617 706 824

94 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

183 01505500

4

Canasawacta Creek near South Plymouth, NY

57.90 32 1,700 2,140 2,690 4,130 5,110 6,370 7,310 8,240 9,190 10,400

1,620 1,940 2,340 3,360 4,050 4,950 5,630 6,340 7,040 7,9701,690 2,120 2,660 4,040 4,930 6,030 6,840 7,630 8,440 9,480

184 01507000

4

Chenango River at Greene, NY

593.00 68 6,740 7,840 9,180 12,400 14,600 17,200 19,100 21,000 23,000 25,500

6,290 7,390 8,720 12,100 14,300 17,000 19,000 21,100 23,000 25,5006,720 7,820 9,160 12,400 14,600 17,200 19,100 21,000 23,000 25,500

185 01507500

4

Genegantslet Creek at Smithville Flats, NY

82.30 34 1,920 2,250 2,650 3,640 4,300 5,130 5,750 6,370 6,990 7,830

2,130 2,540 3,040 4,300 5,140 6,220 7,030 7,860 8,690 9,7901,940 2,270 2,680 3,710 4,430 5,380 6,100 6,830 7,560 8,540

186 01508000

4

Shackham Brook near Truxton, NY B

3.16 36 115 147 191 320 419 559 674 798 931 1,120

111 135 167 251 311 390 451 516 581 669115 146 189 313 402 522 616 715 818 962

187 01508500

4

Albright Creek at East Homer, NY

6.81 38 233 299 389 656 867 1,170 1,420 1,700 2,000 2,450

234 290 363 571 727 937 1,100 1,280 1,460 1,700233 299 387 648 846 1,120 1,340 1,580 1,830 2,200

188 01508803

4

West Branch Tioughnioga River at Homer, NY

71.50 22 761 913 1,110 1,650 2,040 2,590 3,020 3,480 3,970 4,660

1,040 1,230 1,470 2,050 2,440 2,930 3,290 3,670 4,020 4,490

795 947 1,150 1,710 2,130 2,700 3,120 3,560 3,990 4,580

189 01508946

4

Otter Creek Tributary at State Hwy 222 near Cortland, NY

2.85 11 29 37 49 91 131 200 268 351 455 630

85 106 135 220 284 371 441 515 591 69641 50 65 127 188 281 360 446 538 672

Tables 7–10 95
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

190 01509000

4

Tioughnioga River at Cortland, NY

292.00 67 4,080 4,920 5,970 8,710 10,600 13,100 15,000 17,000 19,000 21,700

4,840 5,670 6,680 9,150 10,800 12,800 14,300 15,800 17,300 19,2004,110 4,950 6,000 8,740 10,600 13,100 14,900 16,800 18,700 21,100

191 01509520

4

Tioughnioga River at Lisle, NY B

453.00 18 6,180 7,170 8,410 11,700 14,000 17,100 19,500 22,000 24,600 28,200

7,050 8,250 9,700 13,300 15,600 18,600 20,800 23,000 25,200 27,9006,310 7,310 8,570 12,000 14,400 17,600 20,000 22,500 24,900 28,000

192 01510000

4

Otselic River at Cincinnatus, NY

147.00 63 3,310 3,840 4,480 6,080 7,140 8,460 9,450 10,400 11,400 12,800

3,060 3,630 4,330 6,130 7,340 8,910 10,100 11,300 12,500 14,0003,300 3,830 4,470 6,080 7,160 8,520 9,560 10,600 11,600 13,100

193 01510500

4

Otselic River near Upper Lisle, NY B

217.00 33 4,320 5,090 6,060 8,540 10,200 12,400 14,100 15,800 17,500 19,900

4,170 4,940 5,880 8,300 9,940 12,000 13,600 15,200 16,800 18,9004,310 5,080 6,050 8,510 10,200 12,300 14,000 15,600 17,300 19,500

194 01510610

4

Merrill Creek Tributary near Texas Valley, NY

5.32 23 316 375 450 658 812 1,020 1,200 1,380 1,570 1,850

177 219 274 429 546 702 827 957 1,090 1,270299 359 433 623 753 924 1,070 1,210 1,370 1,580

195 01511500

4

Tioughnioga River at Itaska, NY D

730.00 12 11,200 13,100 15,500 22,000 26,500 32,500 37,100 41,900 47,000 54,000

11,600 13,700 16,100 22,400 26,600 32,000 36,000 40,100 44,000 49,10011,300 13,200 15,600 22,100 26,500 32,300 36,500 40,900 45,200 51,000

196 01512500

4

Chenango River near Chenango Forks, NY

1,483.00 93 16,700 19,000 21,800 29,600 35,200 42,900 49,000 55,600 62,600 72,600

17,900 20,900 24,300 32,800 38,300 45,100 50,100 55,100 59,900 66,00016,700 19,100 21,900 29,700 35,400 43,100 49,100 55,500 62,200 71,500

96 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

197 01513500

4

Susquehanna River at Vestal, NY A

3,941.00 70 39,500 44,900 51,400 67,100 77,200 89,700 98,900 108,000 117,000 129,000

41,200 47,500 54,900 72,800 83,900 97,900 108,000 118,000 127,000 139,00039,600 45,000 51,500 67,400 77,800 90,700 100,000 110,000 119,000 131,000

198 01513712

5

Nanticoke Creek Tributary at Nanticoke, NY

1.70 12 131 166 216 378 520 744 950 1,190 1,480 1,930

80 103 135 236 319 434 535 639 749 913

123 157 204 347 462 630 778 944 1,130 1,430

199 01513790

5

Nanticoke Creek at Union Center, NY

90.70 11 3,470 4,370 5,580 9,030 11,700 15,300 18,300 21,500 25,000 29,900

2,080 2,530 3,150 4,980 6,360 8,290 9,930 11,600 13,300 15,8003,240 4,100 5,210 8,070 10,100 12,600 14,700 16,900 19,200 22,600

200 01513831

5

Susquehanna River at Owego, NY ABC

4,216.00 10 42,100 46,900 52,900 67,900 77,900 90,900 101,000 111,000 121,000 135,000

41,300 47,700 55,100 73,100 84,500 98,800 109,000 119,000 129,000 142,00041,900 47,100 53,300 69,400 80,500 94,800 105,000 116,000 126,000 139,000

201 01514000

5

Owego Creek near Owego, NY

185.00 70 4,110 4,900 5,950 8,980 11,300 14,700 17,500 20,500 23,900 28,900

3,450 4,110 5,020 7,590 9,490 12,100 14,200 16,400 18,700 21,9004,090 4,880 5,920 8,920 11,200 14,500 17,100 20,000 23,200 27,900

202 01514801

5

Catatonk Creek Northwest Of Owego, NY B

150.00 12 2,700 3,200 3,870 5,730 7,140 9,140 10,800 12,600 14,500 17,400

2,280 2,730 3,350 5,080 6,340 8,050 9,470 10,900 12,300 14,4002,630 3,140 3,800 5,590 6,910 8,740 10,200 11,800 13,500 15,900

203 01515000

5

Susquehanna River near Waverly, NY AC

4,773.00 64 48,600 55,600 64,200 85,400 99,500 118,000 131,000 145,000 159,000 177,000

42,500 48,800 56,400 75,100 87,100 102,000 113,000 124,000 135,000 148,00048,300 55,300 63,900 84,800 98,400 116,000 128,000 141,000 154,000 171,000

Tables 7–10 97
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

204 01516500

5

Corey Creek near Mainesburg, PA A

12.20 45 452 581 772 1,460 2,120 3,280 4,420 5,860 7,660 10,800

452 582 776 1,400 1,910 2,670 3,330 4,030 4,790 5,930452 581 772 1,460 2,100 3,200 4,250 5,540 7,100 9,790

205 01516800

5

Manns Creek near Mansfield, PA A

3.01 17 217 258 312 460 569 718 837 963 1,100 1,290

113 148 201 371 514 721 904 1,100 1,300 1,610205 247 301 445 557 719 859 1,010 1,180 1,420

206 01517000

5

Elk Run near Mainesburg, PA A

10.20 24 379 465 591 1,030 1,440 2,140 2,830 3,680 4,740 6,540

338 433 575 1,020 1,390 1,910 2,370 2,850 3,370 4,130375 463 589 1,030 1,430 2,090 2,710 3,440 4,310 5,750

207 01518000

5

Tioga River at Tioga, PA AD

282.00 39 6,080 7,650 9,900 17,400 24,100 34,900 45,000 57,100 71,500 94,900

5,390 6,600 8,320 13,400 17,400 22,900 27,700 32,600 37,800 45,4006,040 7,600 9,820 17,100 23,400 33,100 41,900 52,200 64,200 83,400

208 01518420

5

Crooked Creek below Catlin Hollow at Middlebury Center, PA A

74.30 14 3,000 3,710 4,720 7,970 10,800 15,300 19,400 24,300 30,100 39,300

1,660 2,080 2,700 4,590 6,100 8,240 10,100 12,000 14,100 17,1002,820 3,520 4,470 7,310 9,580 12,900 15,900 19,300 23,100 29,100

209 01518500

5

Crooked Creek at Tioga, PA A

122.00 35 2,920 3,660 4,730 8,410 11,800 17,600 23,100 29,900 38,300 52,300

2,070 2,560 3,260 5,320 6,910 9,120 11,000 12,900 14,900 17,9002,870 3,600 4,650 8,140 11,200 16,200 20,700 26,200 32,800 43,600

210 01518862

5

Cowanesque River at Westfield, PA A

90.60 15 2,060 2,750 3,770 7,150 10,100 14,900 19,300 24,300 30,300 39,600

2,570 3,170 4,030 6,630 8,690 11,600 14,200 16,800 19,600 23,7002,130 2,800 3,800 7,050 9,750 13,900 17,500 21,400 25,800 32,600

98 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

211 01519200

5

Cowanesque River at Elkland, PA A

235.00 20 6,360 7,840 9,830 15,600 20,100 26,600 32,100 38,000 44,500 54,100

4,540 5,550 6,990 11,200 14,500 19,100 23,100 27,100 31,400 37,7006,180 7,640 9,570 15,000 19,000 24,700 29,400 34,400 39,900 48,000

212 01520000

5

Cowanesque River near Lawrenceville, PA AD

298.00 27 6,680 8,240 10,500 17,700 24,200 34,600 44,300 55,800 69,600 91,900

4,850 5,890 7,370 11,700 14,900 19,400 23,300 27,200 31,300 37,2006,540 8,090 10,300 17,000 22,800 31,500 39,300 48,200 58,700 75,300

213 01520500

5

Tioga River at Lindley, NY AD

771.00 50 13,100 16,300 20,600 34,200 45,600 63,300 78,900 97,000 118,000 150,000

12,800 15,700 19,600 31,500 40,700 53,800 65,000 76,500 88,800 107,00013,100 16,300 20,600 34,000 45,200 62,100 76,900 93,700 113,000 142,000

214 01521596

5

Big Creek near Howard, NY

6.32 24 152 203 279 538 775 1,160 1,520 1,950 2,460 3,280

204 262 348 616 836 1,150 1,420 1,700 2,000 2,450156 207 284 548 785 1,160 1,490 1,880 2,320 3,010

215 01522500

5

Karr Valley Creek at Almond, NY

27.40 35 1,550 2,020 2,660 4,530 5,960 7,940 9,550 11,300 13,100 15,600

934 1,180 1,550 2,710 3,660 5,040 6,250 7,510 8,880 10,900

1,510 1,980 2,600 4,370 5,680 7,460 8,910 10,500 12,100 14,400

216 01523500

5

Canacadea Creek near Hornell, NY D

57.90 13 2,160 2,900 3,950 7,140 9,670 13,300 16,300 19,600 23,100 28,200

1,620 2,030 2,630 4,460 5,940 8,050 9,900 11,800 13,900 16,9002,080 2,790 3,770 6,580 8,650 11,500 13,800 16,300 18,900 22,800

217 01525000

5

Bennett Creek at Canisteo, NY B

95.30 10 3,380 4,010 4,870 7,390 9,370 12,300 14,700 17,500 20,600 25,200

2,320 2,900 3,720 6,240 8,240 11,100 13,600 16,100 18,900 22,9003,190 3,830 4,680 7,100 9,000 11,800 14,200 16,800 19,700 24,000

Tables 7–10 99
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

218 01525500

5

Canisteo River at West Cameron, NY

340.00 62 5,450 6,560 8,090 12,900 16,900 23,000 28,500 34,800 42,100 53,600

5,050 6,110 7,610 11,900 15,200 19,700 23,500 27,200 31,300 37,0005,440 6,550 8,080 12,800 16,800 22,700 27,900 33,800 40,500 50,900

219 01526000

5

Tuscarora Creek near South Addison, NY B

114.00 46 3,830 4,910 6,340 10,200 12,900 16,500 19,200 22,000 24,800 28,500

2,140 2,690 3,480 5,910 7,830 10,600 12,900 15,300 17,900 21,8003,750 4,820 6,220 9,900 12,400 15,700 18,200 20,800 23,500 27,100

220 01526500

5

Tioga River near Erwins, NY AD

1,377.00 61 21,000 25,400 31,200 48,300 61,800 81,500 98,200 117,000 137,000 168,000

15,300 18,200 22,200 33,600 41,800 53,300 62,800 72,300 82,300 96,50020,800 25,200 30,900 47,500 60,300 78,600 93,900 111,000 129,000 156,000

221 01527000

5

Cohocton River at Cohocton, NY

52.20 49 286 340 411 625 796 1,050 1,270 1,520 1,790 2,210

1,000 1,240 1,580 2,580 3,340 4,400 5,300 6,200 7,150 8,540

317 373 457 752 1,030 1,470 1,870 2,290 2,760 3,440

222 01528000

5

Fivemile Creek near Kanona, NY

66.80 59 1,000 1,170 1,400 2,040 2,530 3,230 3,820 4,460 5,170 6,220

1,000 1,220 1,510 2,340 2,940 3,750 4,430 5,080 5,770 6,7501,000 1,170 1,400 2,060 2,560 3,290 3,900 4,550 5,260 6,310

223 01528320

5

Cohocton River at Bath, NY B

316.00 10 3,660 4,380 5,370 8,330 10,700 14,200 17,300 20,800 24,600 30,600

4,430 5,340 6,620 10,300 13,000 16,700 19,800 22,900 26,100 30,8003,800 4,530 5,580 8,830 11,500 15,200 18,400 21,800 25,400 30,700

224 01529500

5

Cohocton River near Campbell, NY

470.00 81 4,660 5,670 7,070 11,400 15,000 20,400 25,300 30,800 37,200 47,000

5,710 6,850 8,440 12,900 16,200 20,700 24,400 28,100 32,000 37,5004,690 5,700 7,100 11,500 15,100 20,400 25,200 30,500 36,600 45,800

100 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

225 01530301

5

Cuthrie Run near Big Flats, NY

5.39 21 172 218 279 453 585 770 919 1,080 1,250 1,490

206 270 367 684 954 1,350 1,700 2,070 2,480 3,090175 222 287 485 655 915 1,140 1,390 1,670 2,070

226 01530500

5

Newtown Creek at Elmira, NY D

77.50 53 1,570 1,840 2,170 2,940 3,420 4,000 4,410 4,800 5,180 5,670

1,610 2,000 2,540 4,170 5,440 7,200 8,720 10,200 11,900 14,3001,570 1,850 2,180 3,010 3,590 4,370 5,010 5,640 6,320 7,240

227 01531000

5

Chemung River at Chemung, NY AD

2,506.00 75 31,700 38,100 46,400 68,700 84,900 107,000 124,000 142,000 161,000 188,000

21,400 25,000 30,000 43,500 53,000 65,900 76,600 86,900 97,800 113,00031,400 37,800 46,000 67,600 82,900 103,000 119,000 136,000 153,000 178,000

228 01533250

5

Tuscarora Creek near Silvara, PA A

11.80 33 277 360 473 801 1,050 1,400 1,690 1,990 2,310 2,770

379 479 626 1,080 1,440 1,950 2,390 2,850 3,340 4,060283 367 482 827 1,100 1,500 1,830 2,190 2,560 3,110

229 01542810

5

Waldy Run near Emporium, PA A

5.24 36 131 158 194 308 406 559 697 858 1,050 1,350

274 343 444 752 1,000 1,350 1,660 1,980 2,320 2,830140 167 207 346 477 688 881 1,100 1,340 1,720

230 01543700

5

First Fork Sinnemahoning Creek at Wharton, PA A

182.00 16 3,400 4,000 4,810 7,310 9,370 12,500 15,200 18,400 22,000 27,600

5,420 6,490 8,020 12,500 15,900 20,700 24,900 29,100 33,600 40,1003,640 4,260 5,170 8,220 10,900 15,000 18,600 22,400 26,700 32,900

231 03007800

5

Allegheny River at Port Allegany, PA A

248.00 25 3,740 4,320 5,100 7,450 9,360 12,200 14,700 17,500 20,600 25,500

5,710 6,700 8,070 11,900 14,700 18,500 21,800 25,000 28,400 33,3003,900 4,490 5,320 7,980 10,200 13,600 16,500 19,600 23,000 28,000

Tables 7–10 101
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

232 03010500

5

Allegheny River at Eldred, PA A

550.00 84 5,150 6,090 7,410 11,600 15,100 20,700 25,700 31,600 38,400 49,300

10,100 11,700 13,900 20,000 24,400 30,300 35,300 40,200 45,400 52,700

5,280 6,210 7,560 11,900 15,600 21,400 26,600 32,500 39,200 49,700

233 03010734

5

Ischua Creek Tributary near Machias, NY

5.12 20 143 175 219 348 451 601 728 870 1,030 1,260

169 205 257 400 507 650 771 889 1,010 1,190146 178 222 356 462 614 741 876 1,020 1,230

234 03010800

5

Olean Creek near Olean, NY

198.00 37 2,110 2,710 3,540 6,010 7,950 10,700 13,100 15,600 18,400 22,400

3,250 3,790 4,510 6,450 7,820 9,640 11,100 12,600 14,100 16,2002,170 2,760 3,590 6,050 7,930 10,500 12,700 15,000 17,400 20,900

235 03011000

5

Great Valley Creek near Salamanca, NY

137.00 35 3,440 3,980 4,720 7,060 9,040 12,100 14,900 18,100 21,900 27,900

3,030 3,550 4,270 6,250 7,680 9,620 11,200 12,800 14,500 16,9003,420 3,960 4,700 6,990 8,870 11,700 14,200 16,900 20,200 25,100

236 03011020

5

Allegheny River at Salamanca, NY A

1,608.00 96 17,700 20,100 23,200 31,200 36,800 44,300 50,100 56,300 62,700 71,700

20,700 23,600 27,400 37,600 44,700 54,300 62,200 69,900 77,900 89,00017,800 20,200 23,300 31,400 37,200 45,000 51,100 57,500 64,200 73,600

237 03011800

5

Kinzua Creek near Guffey, PA A

46.40 34 792 989 1,270 2,190 2,990 4,280 5,470 6,880 8,540 11,200

1,460 1,750 2,160 3,320 4,190 5,400 6,430 7,450 8,530 10,100

833 1,030 1,320 2,290 3,140 4,470 5,660 7,010 8,540 10,900

238 03013000

5

Conewango Creek at Waterboro, NY

290.00 56 2,710 3,140 3,690 5,100 6,090 7,400 8,430 9,480 10,600 12,100

3,880 4,360 4,990 6,550 7,570 8,910 10,000 11,000 12,000 13,5002,750 3,180 3,730 5,180 6,210 7,570 8,640 9,700 10,800 12,300

102 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

239 03013800

5

Ball Creek at Stow, NY 9.58 24 716 836 985 1,360 1,620 1,950 2,200 2,450 2,710 3,060

360 432 534 817 1,030 1,320 1,560 1,800 2,050 2,410686 807 950 1,290 1,520 1,810 2,030 2,260 2,510 2,850

240 03015390

5

Hare Creek near Corry, PA A

12.30 19 626 719 841 1,190 1,450 1,820 2,130 2,470 2,840 3,390

579 693 855 1,310 1,660 2,140 2,550 2,960 3,390 4,010621 717 842 1,210 1,490 1,910 2,260 2,640 3,040 3,630

241 03015500

5

Brokenstraw Creek at Youngsville, PA A

321.00 90 5,480 6,370 7,450 10,100 11,900 14,200 15,900 17,600 19,300 21,600

5,700 6,480 7,540 10,300 12,200 14,700 16,800 18,800 20,900 23,8005,490 6,370 7,450 10,100 11,900 14,200 16,000 17,700 19,500 21,900

242 03021350

5

French Creek near Wattsburg, PA A

92.00 25 2,940 3,370 3,890 5,130 5,910 6,880 7,580 8,260 8,940 9,830

2,290 2,600 3,010 4,090 4,840 5,830 6,650 7,440 8,240 9,3702,890 3,320 3,820 5,010 5,730 6,650 7,340 8,030 8,730 9,680

243 04213040

5

Raccoon Creek near West Springfield, PA A

2.53 34 77 98 128 218 288 391 477 572 676 828

89 110 139 223 286 371 443 514 588 69577 99 129 218 288 388 470 559 655 794

244 04213200

5

Mill Creek at Erie, PA A

9.16 23 506 634 814 1,390 1,880 2,630 3,310 4,100 5,010 6,430

342 416 521 824 1,060 1,370 1,640 1,910 2,190 2,600491 617 791 1,320 1,740 2,340 2,860 3,450 4,110 5,130

245 04213376

5

Canadaway Creek at Fredonia, NY

32.90 13 1,280 1,600 2,080 3,670 5,120 7,500 9,750 12,500 15,800 21,200

1,140 1,410 1,800 2,960 3,880 5,180 6,320 7,470 8,710 10,5001,260 1,580 2,040 3,520 4,780 6,690 8,390 10,400 12,600 16,100

Tables 7–10 103
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

246 04213490

5

South Branch Cattaraugus Creek near Otto, NY

25.10 36 996 1,190 1,440 2,170 2,730 3,540 4,210 4,950 5,760 6,960

1,080 1,310 1,620 2,540 3,250 4,240 5,090 5,950 6,860 8,1901,000 1,200 1,450 2,200 2,790 3,650 4,380 5,160 6,010 7,260

247 04213500

5

Cattaraugus Creek at Gowanda, NY

436.00 59 10,500 12,200 14,500 20,300 24,400 29,800 33,900 38,200 42,700 48,900

9,840 11,500 13,700 20,000 24,500 30,900 36,300 41,600 47,200 55,200

10,500 12,200 14,500 20,300 24,400 29,900 34,200 38,700 43,400 50,000

248 04214040

5

Delaware Creek near Angola, NY

8.32 24 231 283 351 530 655 820 947 1,080 1,210 1,400

215 263 331 524 667 860 1,020 1,180 1,350 1,590229 282 349 529 657 829 966 1,110 1,250 1,460

249 04214200

5

Eighteenmile Creek at North Boston, NY

37.20 14 2,300 2,620 3,000 3,970 4,610 5,450 6,080 6,720 7,380 8,280

1,170 1,400 1,730 2,660 3,360 4,320 5,140 5,960 6,820 8,0502,150 2,470 2,840 3,710 4,290 5,070 5,720 6,410 7,140 8,170

250 04214250

5

Smoke Creek at Lackawanna, NY

14.30 13 482 566 676 981 1,210 1,530 1,790 2,070 2,380 2,820

437 536 677 1,090 1,400 1,830 2,200 2,560 2,950 3,510476 562 676 1,000 1,260 1,640 1,950 2,280 2,640 3,150

251 04214400

5

Buffalo Creek near Wales Hollow, NY

76.90 12 2,630 3,210 3,960 5,940 7,330 9,140 10,500 12,000 13,400 15,400

2,100 2,520 3,130 4,860 6,170 7,990 9,540 11,100 12,700 15,1002,550 3,120 3,840 5,700 6,990 8,720 10,100 11,600 13,100 15,300

252 04214410

5

Hunter Creek at Colegrave, NY

14.00 23 647 752 881 1,200 1,400 1,660 1,850 2,040 2,220 2,470

458 555 691 1,080 1,370 1,770 2,110 2,440 2,790 3,300630 737 866 1,180 1,390 1,690 1,920 2,160 2,400 2,750

104 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

253 04214500

5

Buffalo Creek at Gardenville, NY

142.00 61 4,780 5,450 6,250 8,180 9,430 11,000 12,100 13,200 14,400 15,900

3,000 3,550 4,320 6,440 7,990 10,100 11,900 13,600 15,500 18,1004,720 5,390 6,190 8,090 9,320 10,900 12,100 13,300 14,600 16,300

254 04214980

5

Little Buffalo Creek at East Lancaster, NY

24.00 14 465 592 762 1,250 1,620 2,140 2,560 3,020 3,500 4,190

714 868 1,090 1,720 2,210 2,870 3,440 4,010 4,610 5,470499 625 803 1,340 1,770 2,380 2,890 3,430 3,980 4,780

255 04215000

5

Cayuga Creek near Lancaster, NY

96.40 59 3,760 4,430 5,240 7,270 8,610 10,300 11,500 12,800 14,000 15,700

2,250 2,710 3,350 5,180 6,560 8,460 10,100 11,700 13,400 15,8003,710 4,380 5,180 7,160 8,450 10,100 11,300 12,600 13,900 15,700

256 04215500

5

Cazenovia Creek at Ebenezer, NY

135.00 59 5,280 6,040 6,970 9,240 10,700 12,600 14,000 15,400 16,700 18,600

3,420 4,050 4,930 7,410 9,260 11,800 14,000 16,100 18,400 21,6005,210 5,980 6,900 9,140 10,600 12,500 14,000 15,500 17,000 19,100

257 04216400

6

Tonawanda Creek near Johnsonburg, NY

23.70 25 610 704 821 1,120 1,330 1,600 1,810 2,030 2,250 2,560

637 790 990 1,530 1,920 2,450 2,850 3,260 3,710 4,310612 710 833 1,160 1,400 1,710 1,970 2,230 2,500 2,880

258 04216418

6

Tonawanda Creek at Attica, NY

76.90 22 2,210 2,530 2,930 4,010 4,780 5,820 6,630 7,490 8,400 9,680

1,460 1,780 2,200 3,330 4,120 5,190 6,000 6,840 7,740 8,9502,140 2,470 2,870 3,940 4,700 5,730 6,520 7,370 8,270 9,530

259 04216500

6

Little Tonawanda Creek at Linden, NY

22.10 79 617 776 982 1,530 1,910 2,400 2,780 3,160 3,550 4,080

541 670 838 1,290 1,600 2,010 2,330 2,650 2,990 3,450615 774 978 1,520 1,900 2,380 2,760 3,130 3,520 4,040

Tables 7–10 105
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

260 04216875

6

Little Tonawanda Creek Tributary near Batavia, NY

1.02 11 64 75 88 119 138 162 179 195 211 232

38 45 54 73 85 98 107 116 124 13459 70 83 111 127 145 158 171 183 199

261 04217000

6

Tonawanda Creek at Batavia, NY

171.00 55 2,730 3,250 3,860 5,200 5,970 6,820 7,390 7,900 8,380 8,940

2,260 2,730 3,330 4,920 6,030 7,530 8,650 9,820 11,100 12,7002,710 3,230 3,840 5,190 5,970 6,870 7,490 8,060 8,610 9,280

262 04217500

6

Tonawanda Creek near Alabama, NY

231.00 65 3,510 4,040 4,660 6,080 6,930 7,920 8,610 9,260 9,890 10,700

2,630 3,140 3,790 5,480 6,650 8,230 9,400 10,600 11,900 13,6003,480 4,010 4,640 6,060 6,920 7,940 8,660 9,350 10,000 10,900

263 04217700

6

Murder Creek at Pembroke, NY

43.60 25 692 839 1,010 1,420 1,670 1,950 2,150 2,330 2,500 2,720

721 864 1,040 1,510 1,840 2,260 2,580 2,890 3,230 3,670695 840 1,010 1,430 1,690 1,990 2,220 2,420 2,630 2,890

264 04217750

6

Murder Creek near Akron, NY

58.80 17 698 862 1,070 1,620 2,000 2,480 2,850 3,230 3,610 4,120

892 1,060 1,270 1,820 2,190 2,680 3,040 3,410 3,800 4,300721 883 1,090 1,640 2,030 2,520 2,890 3,270 3,650 4,160

265 04218000

6

Tonawanda Creek at Rapids, NY

349.00 31 3,190 3,730 4,410 6,230 7,530 9,270 10,700 12,100 13,600 15,800

3,490 4,110 4,910 6,980 8,420 10,300 11,800 13,200 14,800 16,9003,210 3,750 4,440 6,280 7,610 9,390 10,800 12,300 13,800 16,000

266 04218518

6

Ellicott Creek below Williamsville, NY B

81.60 44 1,370 1,580 1,840 2,590 3,150 3,930 4,580 5,270 6,030 7,130

1,220 1,420 1,660 2,250 2,640 3,140 3,500 3,860 4,240 4,7201,360 1,570 1,830 2,570 3,120 3,870 4,480 5,130 5,840 6,860

106 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

267 04219645

6

Fourmile Creek near Youngstown, NY

4.88 15 77 103 138 237 309 405 480 555 633 738

90 108 130 185 220 264 295 325 356 39379 104 137 230 294 376 437 498 561 645

268 04219738

6

Eighteenmile Creek Tributary near Lockport, NY

2.96 10 178 203 231 294 331 372 401 428 453 484

87 105 128 183 218 262 293 323 355 393

161 187 215 272 304 341 368 393 419 452

269 04219900

6

Johnson Creek near Lyndonville, NY

95.10 35 1,100 1,310 1,570 2,270 2,760 3,410 3,920 4,450 5,000 5,770

969 1,160 1,390 1,990 2,410 2,940 3,350 3,750 4,190 4,730

1,090 1,300 1,560 2,250 2,730 3,360 3,860 4,360 4,900 5,630

270 04219922

6

Oak Orchard Creek at Barrville Road near Elba, NY

6.48 11 109 125 144 183 204 228 244 258 271 287

150 179 214 298 351 416 462 505 551 605116 134 154 203 237 277 307 334 361 393

271 04220150

6

Oak Orchard Creek at Medina, NY

157.00 15 660 787 935 1,270 1,460 1,670 1,810 1,940 2,060 2,210

1,090 1,250 1,460 1,990 2,360 2,820 3,160 3,490 3,860 4,310

717 841 994 1,370 1,610 1,910 2,120 2,320 2,520 2,770

272 04220250

6

West Creek near Hilton, NY

31.00 20 597 688 797 1,060 1,220 1,420 1,560 1,700 1,830 2,010

374 455 555 810 982 1,200 1,360 1,520 1,690 1,900574 667 776 1,030 1,190 1,380 1,520 1,660 1,800 1,990

273 0422026250

6

Northrup Creek at North Greece, NY

10.10 11 261 315 379 532 628 741 821 897 970 1,060

162 198 241 351 423 514 581 644 711 794244 297 359 500 583 682 751 819 887 971

Tables 7–10 107
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

274 04220500

5

Dyke Creek at Wellsville, NY

72.10 11 1,610 1,910 2,320 3,590 4,660 6,320 7,800 9,520 11,500 14,700

1,840 2,270 2,890 4,740 6,190 8,230 10,000 11,800 13,700 16,5001,650 1,960 2,410 3,860 5,130 7,060 8,760 10,600 12,600 15,600

275 04221000

5

Genesee River at Wellsville, NY AB

288.00 83 4,610 5,560 6,860 10,800 14,100 19,000 23,300 28,200 33,800 42,400

5,110 6,100 7,490 11,400 14,300 18,300 21,700 25,100 28,700 33,8004,620 5,570 6,870 10,800 14,100 18,900 23,200 27,900 33,200 41,300

276 04221769

5

Black Creek at Hyder Flats Road at Black Creek, NY

10.70 16 534 648 796 1,200 1,500 1,910 2,230 2,580 2,940 3,460

446 552 706 1,160 1,530 2,030 2,470 2,920 3,400 4,100524 638 786 1,190 1,510 1,950 2,310 2,710 3,130 3,730

277 04222600

5

Wiscoy Creek at Bliss, NY

22.00 25 561 672 814 1,190 1,450 1,790 2,060 2,340 2,620 3,020

648 774 950 1,440 1,800 2,290 2,700 3,100 3,530 4,130568 679 824 1,220 1,510 1,900 2,220 2,550 2,890 3,380

278 04223000

5

Genesee River at Portageville, NY A

984.00 92 15,800 18,400 21,800 31,500 38,800 49,100 57,700 67,000 77,200 92,100

13,300 15,500 18,600 27,000 33,100 41,400 48,300 55,000 62,200 72,20015,700 18,300 21,700 31,300 38,500 48,600 56,900 65,900 75,600 89,800

279 04224700

5

Sugar Creek near Ossian, NY

10.00 23 337 412 514 817 1,060 1,410 1,710 2,040 2,410 2,960

267 343 456 810 1,100 1,510 1,860 2,230 2,630 3,210331 407 510 816 1,070 1,430 1,750 2,100 2,480 3,040

280 04224775

5

Canaseraga Creek above Dansville, NY

88.90 25 1,350 1,690 2,140 3,430 4,410 5,780 6,900 8,100 9,390 11,200

1,760 2,180 2,800 4,650 6,090 8,120 9,870 11,600 13,500 16,3001,380 1,720 2,190 3,580 4,690 6,290 7,650 9,080 10,600 12,800

108 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

281 04224807

5

Stony Brook Tributary at South Dansville, NY

3.15 16 61 92 143 354 579 992 1,420 1,960 2,650 3,850

127 166 225 414 573 803 1,010 1,220 1,450 1,800

69 100 152 364 577 934 1,280 1,680 2,170 2,980

282 04224900

5

Mill Creek at Patchinville, NY

4.22 22 117 167 245 546 851 1,390 1,930 2,620 3,480 4,940

168 218 293 535 738 1,030 1,290 1,560 1,860 2,300122 171 249 545 830 1,300 1,750 2,300 2,950 4,020

283 04225000

5

Canaseraga Creek near Dansville, NY

152.00 61 2,520 3,100 3,840 5,790 7,140 8,890 10,200 11,600 13,000 14,900

2,870 3,560 4,540 7,510 9,830 13,100 15,900 18,800 21,900 26,4002,530 3,110 3,860 5,880 7,340 9,320 10,900 12,600 14,300 16,800

284 04226000

5

Keshequa Creek at Craig Colony at Sonyea, NY

68.30 18 1,920 2,350 2,940 4,630 5,950 7,840 9,420 11,100 13,000 15,800

1,430 1,800 2,350 4,040 5,390 7,320 8,990 10,700 12,600 15,3001,870 2,300 2,880 4,540 5,830 7,690 9,280 11,000 12,900 15,600

285 04227000

5

Canaseraga Creek at Shakers Crossing, NY

335.00 38 2,600 3,020 3,540 4,870 5,770 6,950 7,850 8,770 9,720 11,000

5,130 6,340 8,070 13,300 17,300 22,900 27,800 32,700 38,000 45,8002,740 3,180 3,770 5,560 7,090 9,430 11,500 13,600 16,000 19,200

286 04227500

5

Genesee River near Mount Morris, NY AD

1,424.00 49 16,100 18,700 22,200 31,900 39,400 49,900 58,600 68,100 78,500 93,700

20,200 24,000 29,200 44,200 55,300 70,800 84,000 97,100 111,000 131,00016,300 18,900 22,500 32,700 40,800 52,500 62,400 72,900 84,400 101,000

287 04229500

6

Honeoye Creek at Honeoye Falls, NY

196.00 52 1,150 1,410 1,750 2,730 3,490 4,560 5,450 6,420 7,470 9,010

1,050 1,270 1,550 2,330 2,890 3,660 4,230 4,830 5,470 6,3101,150 1,400 1,740 2,710 3,460 4,500 5,350 6,280 7,290 8,750

Tables 7–10 109
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

288 04230380

6

Oatka Creek at Warsaw, NY

39.10 36 1,030 1,210 1,440 2,110 2,610 3,330 3,910 4,550 5,240 6,260

999 1,240 1,540 2,360 2,920 3,690 4,270 4,860 5,490 6,350

1,030 1,210 1,450 2,130 2,630 3,370 3,950 4,590 5,270 6,270

289 04230500

6

Oatka Creek at Garbutt, NY

200.00 54 1,670 2,030 2,490 3,750 4,670 5,900 6,890 7,920 9,000 10,500

2,300 2,760 3,350 4,860 5,900 7,290 8,310 9,350 10,500 11,9001,700 2,060 2,520 3,800 4,740 5,990 7,000 8,040 9,130 10,600

290 04231000

6

Black Creek at Churchville, NY

130.00 54 1,100 1,310 1,590 2,300 2,810 3,480 4,000 4,530 5,090 5,860

1,120 1,350 1,650 2,430 2,980 3,710 4,260 4,820 5,420 6,2001,100 1,310 1,590 2,310 2,820 3,500 4,020 4,550 5,120 5,890

291 04231040

6

Hotel Creek at Griffin Road near Churchville, NY

4.57 11 55 60 64 75 81 88 93 97 102 107

72 86 103 145 171 203 225 245 267 29258 64 70 87 101 118 131 143 155 169

292 04232000

6

Genesee River at Rochester, NY ACD

2,467.00 40 17,900 20,000 22,600 30,100 35,600 43,300 49,600 56,400 63,800 74,500

20,900 24,700 29,800 44,000 54,200 68,400 79,900 91,500 104,000 121,00018,100 20,200 22,900 31,000 37,300 46,400 53,900 61,900 70,600 83,000

293 04232034

6

Irondequoit Creek at Railroad Mills near Fishers, NY

39.20 10 359 405 460 592 678 784 863 940 1,020 1,120

344 404 480 668 793 949 1,060 1,170 1,290 1,430356 405 463 607 705 830 924 1,020 1,110 1,230

294 04232040

6

Irondequoit Creek near Pittsford, NY B

44.40 19 407 448 501 644 749 892 1,010 1,130 1,260 1,450

373 436 515 711 840 1,000 1,120 1,230 1,350 1,490403 447 502 651 762 910 1,030 1,150 1,280 1,460

110 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

295 04232046

6

Thomas Creek at Fairport, NY B

28.50 10 137 160 188 256 299 351 390 427 464 512

261 306 362 501 593 707 790 868 953 1,050160 184 216 303 369 451 514 572 631 703

296 04232047

6

Irondequoit Creek at Linden Avenue East Rochester, NY

101.00 15 638 730 842 1,120 1,300 1,530 1,700 1,870 2,040 2,270

745 867 1,020 1,390 1,650 1,960 2,190 2,400 2,640 2,930652 746 862 1,160 1,360 1,620 1,810 2,000 2,190 2,450

297 0423204920

6

East Branch Allen Creek at Pittsford, NY B

6.96 10 158 182 213 300 365 455 529 609 695 820

113 135 163 231 274 328 366 403 441 486150 174 205 287 344 419 479 541 608 702

298 0423205010

6

Irondequoit Creek above Blossom Road near Rochester, NY

142.00 24 918 1,090 1,310 1,910 2,340 2,940 3,420 3,920 4,460 5,220

980 1,150 1,350 1,870 2,220 2,660 2,990 3,300 3,650 4,070923 1,090 1,310 1,910 2,330 2,900 3,350 3,810 4,320 5,010

299 042320527

6

Mill Creek Tributary near Webster, NY

2.12 13 76 92 110 155 182 215 239 261 282 309

65 80 97 139 166 198 221 242 264 29075 90 109 152 179 211 234 256 277 304

300 042320578

6

Bear Creek at Ontario, NY

6.74 28 76 89 106 152 184 228 262 297 334 386

88 104 124 174 207 247 276 304 333 36877 90 107 154 186 230 264 298 334 383

301 04232071

6

Second Creek Tributary at Alton, NY

1.07 13 26 30 36 48 55 64 69 75 80 86

37 44 54 78 93 113 127 140 154 17027 32 38 53 63 75 84 93 101 111

Tables 7–10 111
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

302 04232087

6

Red Creek Tributary No 16 near Red Creek, NY

2.90 11 63 77 94 139 172 215 248 283 319 368

63 74 87 119 139 164 182 198 216 23763 76 93 136 164 201 229 257 286 324

303 04232100

6

Sterling Creek at Sterling, NY

44.40 38 655 752 866 1,130 1,290 1,490 1,620 1,750 1,880 2,040

413 466 534 703 815 955 1,060 1,150 1,260 1,380641 738 850 1,100 1,250 1,440 1,560 1,680 1,810 1,960

304 04232200

5

Catharine Creek at Montour Falls, NY

41.10 18 573 734 970 1,810 2,600 3,960 5,290 6,940 8,980 12,500

944 1,190 1,540 2,630 3,490 4,710 5,770 6,850 8,010 9,710614 777 1,030 1,940 2,790 4,170 5,440 6,910 8,620 11,400

305 04232460

6

Sugar Creek at Guyanoga, NY

28.90 35 265 362 502 943 1,310 1,850 2,310 2,820 3,380 4,200

519 641 799 1,210 1,490 1,860 2,140 2,420 2,710 3,090280 377 517 960 1,320 1,850 2,290 2,770 3,290 4,050

306 04232630

6

Kendig Creek near Macdougall, NY

13.80 34 323 399 490 699 823 964 1,060 1,140 1,220 1,320

215 257 309 439 524 631 708 783 862 958316 391 480 682 798 930 1,020 1,090 1,170 1,270

307 04233000

5

Cayuga Inlet near Ithaca, NY

35.20 63 713 931 1,240 2,220 3,040 4,300 5,410 6,670 8,100 10,300

912 1,150 1,490 2,550 3,400 4,610 5,660 6,740 7,890 9,600720 937 1,250 2,240 3,070 4,330 5,440 6,680 8,070 10,200

112 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

308 04233255

5

Cayuga Inlet at Ithaca, NY B

86.70 27 1,980 2,530 3,320 5,730 7,710 10,700 13,200 16,100 19,300 24,200

2,440 3,090 4,050 7,080 9,570 13,200 16,400 19,800 23,400 28,9002,010 2,570 3,370 5,880 8,000 11,200 14,000 17,100 20,500 25,600

309 04233258

5

Coy Glen Creek at Ithaca, NY

3.56 17 122 168 234 451 637 921 1,170 1,450 1,770 2,260

161 211 287 537 752 1,070 1,350 1,650 1,970 2,460127 172 240 465 662 965 1,230 1,520 1,850 2,340

310 04233310

5

Sixmile Creek near Ithaca, NY B

42.00 15 1,010 1,350 1,860 3,660 5,360 8,230 11,000 14,400 18,500 25,300

1,200 1,500 1,940 3,280 4,360 5,900 7,230 8,610 10,100 12,3001,030 1,370 1,870 3,590 5,110 7,490 9,640 12,100 15,000 19,600

311 04233676

5

Virgil Creek at Mill Street at Dryden, NY B

20.70 17 576 701 876 1,410 1,860 2,540 3,140 3,830 4,610 5,830

676 819 1,020 1,600 2,040 2,640 3,160 3,670 4,210 5,000587 713 891 1,440 1,900 2,570 3,150 3,770 4,450 5,490

312 04233700

5

Virgil Creek at Freeville, NY B

40.30 13 766 933 1,170 1,950 2,630 3,730 4,740 5,940 7,360 9,670

1,130 1,370 1,710 2,680 3,420 4,440 5,310 6,170 7,090 8,410

819 989 1,240 2,100 2,850 3,980 4,970 6,040 7,240 9,070

313 04234000

5

Fall Creek near Ithaca, NY

126.00 80 2,190 2,580 3,100 4,670 5,950 7,850 9,490 11,400 13,500 16,700

2,420 2,880 3,520 5,310 6,610 8,380 9,870 11,300 12,900 15,1002,200 2,590 3,110 4,700 5,990 7,890 9,530 11,400 13,400 16,500

314 042340202

6

Cayuga Lake Tributary No 8 near Jacksonville, NY

1.36 10 55 68 84 128 160 205 241 278 319 376

62 76 93 133 158 188 210 231 252 27857 69 85 129 160 200 231 263 296 341

Tables 7–10 113
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

315 042340588

6

Yawger Creek Tributary near Auburn, NY

1.76 11 27 33 40 60 74 92 106 120 134 153

44 54 66 97 118 144 164 183 203 22830 36 44 67 84 106 123 139 156 178

316 04234138

6

Schaeffer Creek near Canandaigua, NY

7.84 23 161 198 243 348 410 483 532 577 619 671

156 191 236 350 424 520 588 656 725 813161 198 243 348 412 488 541 591 639 699

317 04234200

6

Mud Creek at East Victor, NY

64.20 34 771 924 1,110 1,520 1,770 2,060 2,260 2,440 2,610 2,830

756 914 1,120 1,640 1,990 2,450 2,790 3,120 3,480 3,930770 923 1,110 1,530 1,790 2,100 2,320 2,530 2,730 2,980

318 04234363

6

Marbletown Creek Tributary near Newark, NY

0.58 11 17 19 21 26 28 31 33 34 36 38

15 18 21 29 33 38 42 45 48 5217 19 21 26 29 33 35 38 40 42

319 04234400

6

West River near Middlesex, NY

29.30 13 339 477 677 1,310 1,820 2,570 3,190 3,860 4,590 5,640

440 533 653 955 1,160 1,410 1,600 1,790 1,980 2,230354 485 674 1,250 1,690 2,300 2,780 3,290 3,840 4,630

320 04235250

6

Flint Creek at Phelps, NY

102.00 39 847 1,070 1,350 2,050 2,510 3,060 3,460 3,850 4,220 4,690

1,030 1,240 1,520 2,220 2,700 3,340 3,800 4,280 4,780 5,440

857 1,080 1,360 2,060 2,520 3,090 3,500 3,900 4,290 4,780

321 04235255

6

Canandaigua Outlet Tributary near Alloway, NY

2.94 22 47 55 65 87 101 115 125 135 143 154

57 66 77 103 118 137 149 161 172 18648 56 66 89 103 119 129 139 149 161

114 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

322 04235276

6

Black Brook at Tyre, NY

19.00 28 220 270 333 492 597 727 823 918 1,010 1,130

181 212 251 349 414 496 556 613 675 750217 266 328 481 579 699 786 872 958 1,070

323 04240100

6

Harbor Brook at Syracuse, NY

10.00 40 142 179 226 344 423 521 592 661 729 818

294 348 413 568 666 786 873 955 1,040 1,150150 187 234 357 440 544 620 693 765 858

324 04242500

1

East Branch Fish Creek at Taberg, NY

188.00 72 5,100 5,780 6,670 9,090 10,900 13,400 15,400 17,500 19,800 23,200

4,650 5,210 5,890 7,710 8,980 10,600 11,900 13,300 14,500 16,5005,090 5,760 6,650 9,020 10,800 13,200 15,100 17,000 19,200 22,400

325 04242795

1

Canada Creek Tributary near Lee Center, NY

1.34 10 55 65 79 117 147 191 228 268 314 381

48 55 65 90 109 134 153 174 193 22454 63 76 110 134 167 194 224 255 303

326 04243500

6

Oneida Creek at Oneida, NY

113.00 50 2,180 2,660 3,290 5,040 6,340 8,130 9,580 11,100 12,800 15,100

1,870 2,250 2,740 4,050 4,960 6,190 7,120 8,080 9,110 10,5002,170 2,640 3,270 4,990 6,260 7,990 9,380 10,800 12,500 14,600

327 04245000

6

Limestone Creek at Fayetteville, NY

85.50 56 1,490 1,890 2,430 3,910 5,000 6,470 7,630 8,840 10,100 11,900

1,580 1,910 2,330 3,430 4,200 5,250 6,040 6,860 7,740 8,9101,490 1,890 2,430 3,890 4,960 6,390 7,510 8,680 9,900 11,600

328 04245200

6

Butternut Creek near Jamesville, NY

32.20 41 650 773 931 1,360 1,670 2,090 2,430 2,780 3,160 3,690

759 917 1,120 1,650 2,010 2,480 2,830 3,190 3,570 4,070656 780 939 1,380 1,690 2,120 2,470 2,820 3,210 3,730

Tables 7–10 115
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

329 04245840

1

Scriba Creek near Constantia, NY

38.40 32 567 644 738 969 1,120 1,310 1,460 1,600 1,750 1,950

621 720 845 1,180 1,410 1,700 1,920 2,170 2,380 2,730570 649 744 990 1,160 1,380 1,550 1,720 1,890 2,130

330 04249050

1

Catfish Creek at New Haven, NY

31.70 37 387 449 527 735 883 1,080 1,240 1,410 1,580 1,830

414 469 538 721 849 1,020 1,140 1,280 1,400 1,590389 450 528 734 879 1,070 1,220 1,390 1,540 1,780

331 042490673

1

North Branch Grindstone Creek near Altmar, NY

10.10 24 209 244 288 393 461 545 606 666 726 805

235 274 324 456 550 672 763 866 957 1,100211 246 290 401 476 573 645 720 791 891

332 04249200

1

North Branch Salmon River at Redfield, NY

82.50 13 3,730 4,050 4,470 5,570 6,360 7,430 8,270 9,160 10,100 11,400

1,960 2,220 2,540 3,400 4,000 4,770 5,340 6,010 6,580 7,4903,470 3,810 4,200 5,100 5,700 6,510 7,150 7,890 8,620 9,720

333 04250750

1

Sandy Creek near Adams, NY

137.00 42 4,070 4,590 5,190 6,530 7,330 8,260 8,900 9,510 10,100 10,800

3,590 4,170 4,880 6,800 8,160 9,960 11,300 12,900 14,300 16,5004,050 4,570 5,180 6,550 7,420 8,500 9,280 10,100 10,900 11,900

334 04252500

1

Black River near Boonville, NY

304.00 94 4,460 5,010 5,720 7,630 9,030 10,900 12,500 14,100 15,800 18,400

5,010 5,690 6,510 8,680 10,200 12,100 13,500 15,100 16,400 18,7004,470 5,020 5,740 7,670 9,090 11,000 12,600 14,200 15,900 18,400

335 04254500

1

Moose River at Mckeever, NY

363.00 81 5,930 6,680 7,600 9,950 11,600 13,600 15,200 16,800 18,500 20,800

5,760 6,580 7,570 10,200 12,000 14,200 15,900 17,800 19,400 22,0005,930 6,680 7,600 9,960 11,600 13,600 15,300 16,900 18,600 20,900

116 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

336 04256000

1

Independence River at Donnattsburg, NY B

88.70 72 1,540 1,780 2,090 3,030 3,780 4,880 5,820 6,880 8,070 9,890

1,500 1,740 2,030 2,800 3,330 4,010 4,510 5,080 5,570 6,3601,540 1,780 2,090 3,020 3,750 4,800 5,690 6,680 7,780 9,470

337 04256040

1

Tributary to Mill Creek Tributary near Lowville, NY

1.66 18 97 112 131 185 227 288 339 395 457 551

97 115 139 206 257 327 382 445 504 59697 112 131 188 234 299 352 411 474 567

338 04256485

1

Woods Lake Outlet near Big Moose, NY

0.80 13 13 16 21 36 50 73 95 121 152 204

19 22 26 38 46 57 65 74 82 9513 17 21 36 49 68 84 102 123 157

339 04258700

1

Deer River at Deer River, NY B

94.80 68 3,850 4,530 5,420 7,940 9,850 12,600 14,800 17,200 19,900 23,700

2,650 3,040 3,520 4,800 5,710 6,890 7,770 8,800 9,690 11,1003,810 4,490 5,360 7,780 9,560 12,100 14,100 16,200 18,700 22,100

340 04260500

1

Black River at Watertown, NY

1,864.00 99 17,600 19,500 21,700 27,500 31,500 36,600 40,500 44,600 48,700 54,500

17,800 19,600 21,700 27,400 31,300 36,200 39,900 44,200 47,600 53,30017,600 19,500 21,700 27,500 31,500 36,600 40,500 44,600 48,600 54,400

341 04260575

1

Horse Creek Tributary near Dexter, NY

4.59 11 161 208 275 477 640 881 1,090 1,310 1,560 1,940

146 178 221 340 428 548 641 746 845 997158 204 266 443 573 752 901 1,060 1,230 1,500

342 04262500

1

West Branch Oswegatchie River near Harrisville, NY

258.00 83 3,290 3,680 4,140 5,260 5,970 6,850 7,500 8,130 8,770 9,620

3,550 4,100 4,780 6,570 7,790 9,330 10,500 11,800 12,800 14,6003,300 3,690 4,160 5,310 6,080 7,040 7,760 8,480 9,180 10,100

Tables 7–10 117
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

343 04263000

1

Oswegatchie River near Heuvelton, NY

986.00 83 7,420 8,280 9,320 11,900 13,500 15,600 17,100 18,700 20,200 22,300

6,610 7,340 8,200 10,500 12,000 14,000 15,400 17,000 18,400 20,5007,400 8,260 9,290 11,800 13,400 15,500 17,000 18,500 20,000 22,100

344 04263445

1

Birch Creek at Pierces Corners, NY

1.67 10 42 48 55 72 84 97 107 117 127 140

35 42 53 82 103 131 153 177 199 23341 47 55 75 90 111 128 145 162 186

345 04264300

1

Brandy Brook near Waddington, NY

22.80 23 234 290 366 590 767 1,030 1,250 1,490 1,750 2,150

264 313 377 548 668 825 942 1,070 1,190 1,370237 292 367 584 749 983 1,170 1,370 1,590 1,920

346 04264400

1

Middle Branch Grass River near Clare, NY

63.00 12 928 1,100 1,320 1,930 2,370 3,000 3,500 4,040 4,610 5,450

1,100 1,300 1,560 2,260 2,760 3,390 3,860 4,400 4,860 5,590

955 1,130 1,360 2,010 2,490 3,140 3,640 4,190 4,720 5,510

347 04264700

1

North Branch Grass River near Clare, NY

46.30 11 346 413 502 760 962 1,260 1,500 1,770 2,080 2,530

705 832 994 1,430 1,730 2,110 2,390 2,710 2,990 3,430406 477 580 925 1,210 1,590 1,870 2,190 2,500 2,950

348 04265000

1

Grass River at Pyrites, NY

333.00 53 3,550 4,010 4,560 5,830 6,620 7,570 8,250 8,910 9,560 10,400

3,610 4,170 4,860 6,660 7,900 9,460 10,600 11,900 13,000 14,8003,550 4,020 4,570 5,880 6,730 7,790 8,560 9,340 10,100 11,100

349 04265100

1

Elm Creek near Hermon, NY

32.60 41 454 523 608 827 976 1,170 1,320 1,470 1,620 1,840

527 628 757 1,110 1,350 1,670 1,910 2,170 2,410 2,780457 528 616 850 1,020 1,240 1,420 1,590 1,770 2,020

118 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

350 04265200

1

Tanner Creek at Stellaville, NY

33.40 11 537 640 772 1,130 1,380 1,720 1,990 2,280 2,570 2,990

493 588 712 1,040 1,280 1,580 1,800 2,050 2,280 2,620529 632 762 1,110 1,350 1,670 1,910 2,180 2,440 2,820

351 04265300

1

Little River near Canton, NY

42.40 18 727 905 1,150 1,860 2,420 3,240 3,940 4,700 5,550 6,810

718 864 1,050 1,560 1,930 2,390 2,740 3,140 3,490 4,030726 901 1,140 1,810 2,310 3,000 3,570 4,190 4,840 5,830

352 04267600

1

Cold Brook near South Colton, NY

18.70 15 265 307 359 494 587 710 804 902 1,000 1,140

361 429 518 756 925 1,140 1,310 1,490 1,650 1,900277 321 378 544 673 845 980 1,120 1,250 1,440

353 04267700

1

Parkhurst Brook near Potsdam, NY

16.80 18 240 288 353 544 694 913 1,100 1,300 1,530 1,870

296 357 436 652 806 1,010 1,150 1,320 1,470 1,700246 295 362 562 719 940 1,120 1,310 1,510 1,810

354 04267800

1

Trout Brook at Allen Corners, NY

54.20 28 671 821 1,020 1,600 2,040 2,680 3,210 3,790 4,430 5,360

593 707 852 1,240 1,520 1,870 2,130 2,420 2,680 3,080666 813 1,010 1,560 1,960 2,520 2,970 3,460 3,990 4,770

355 04268200

1

Plum Brook near Grantville, NY

43.90 38 512 592 694 975 1,180 1,470 1,700 1,950 2,220 2,600

444 531 643 943 1,150 1,420 1,610 1,830 2,030 2,330508 589 691 973 1,180 1,460 1,680 1,930 2,180 2,540

356 04268700

1

St. Regis River at St. Regis Falls, NY

234.00 10 1,610 1,840 2,120 2,840 3,330 3,970 4,450 4,950 5,460 6,160

2,510 2,880 3,330 4,510 5,310 6,330 7,070 7,920 8,630 9,7801,770 2,010 2,330 3,280 4,000 4,930 5,610 6,340 7,000 7,950

Tables 7–10 119
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

357 04268720

1

Hopkinton Brook at Hopkinton, NY

20.00 20 363 420 488 656 764 899 997 1,100 1,190 1,320

361 431 523 770 945 1,170 1,340 1,520 1,690 1,950363 421 492 673 801 968 1,100 1,230 1,350 1,530

358 04268800

1

West Branch St. Regis River near Parishville, NY

171.00 41 1,870 2,200 2,600 3,600 4,240 5,040 5,630 6,210 6,790 7,550

2,070 2,380 2,760 3,770 4,470 5,350 5,990 6,730 7,350 8,3501,880 2,210 2,610 3,610 4,270 5,080 5,690 6,300 6,890 7,700

359 04269000

1

St. Regis River at Brasher Center, NY

612.00 87 5,740 6,540 7,520 10,000 11,800 14,000 15,800 17,600 19,400 22,000

6,030 6,930 8,010 10,900 12,800 15,200 17,000 19,000 20,700 23,5005,750 6,550 7,530 10,000 11,900 14,100 15,900 17,700 19,500 22,200

360 04269050

1

Allen Brook near Brasher Falls, NY

16.00 25 332 418 528 823 1,030 1,300 1,510 1,710 1,930 2,210

261 319 394 602 751 945 1,090 1,250 1,400 1,630326 410 518 796 983 1,220 1,410 1,590 1,790 2,050

361 04269100

1

Lawrence Brook near Moira, NY

25.70 23 494 617 779 1,230 1,570 2,030 2,400 2,790 3,200 3,790

468 574 713 1,100 1,370 1,740 2,010 2,320 2,600 3,030491 613 773 1,210 1,530 1,960 2,300 2,660 3,030 3,560

362 04269500

1

Deer River at Brasher Iron Works, NY

191.00 22 1,730 2,080 2,550 3,840 4,790 6,100 7,150 8,270 9,460 11,200

1,970 2,330 2,760 3,930 4,730 5,740 6,480 7,330 8,050 9,2001,750 2,100 2,570 3,850 4,780 6,010 6,970 8,000 9,040 10,600

363 04270000

1

Salmon River at Chasm Falls, NY

132.00 70 1,220 1,420 1,660 2,220 2,560 2,960 3,250 3,530 3,790 4,130

1,910 2,270 2,720 3,930 4,770 5,830 6,620 7,500 8,270 9,4901,240 1,440 1,690 2,300 2,710 3,220 3,600 3,970 4,320 4,790

120 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

364 04270100

1

West Branch Deer Creek at Fort Covington Center, NY

32.40 21 647 766 911 1,270 1,510 1,800 2,020 2,240 2,460 2,740

505 618 767 1,180 1,470 1,850 2,140 2,460 2,750 3,210634 753 897 1,260 1,500 1,810 2,050 2,300 2,550 2,890

365 04270150

1

East Branch Deer Creek at Fort Covington Center, NY

23.90 21 464 558 679 996 1,220 1,510 1,740 1,970 2,210 2,540

436 532 658 1,010 1,260 1,580 1,830 2,110 2,360 2,760461 556 677 998 1,230 1,530 1,760 2,010 2,260 2,610

366 04270162

1

East Branch Little Salmon River near Skerry, NY

7.11 16 81 96 114 160 190 228 256 285 314 352

129 155 190 284 351 438 503 575 640 741

87 103 123 182 229 291 338 388 434 500

367 04270200

1

Little Salmon River at Bombay, NY

92.20 40 1,310 1,530 1,790 2,420 2,830 3,320 3,670 4,020 4,360 4,810

1,260 1,520 1,840 2,720 3,330 4,130 4,710 5,380 5,970 6,8901,310 1,530 1,790 2,440 2,890 3,440 3,840 4,270 4,670 5,220

368 04270700

1

Trout River at Trout River, NY

107.00 40 1,960 2,340 2,820 4,060 4,920 6,050 6,910 7,800 8,710 9,970

1,880 2,280 2,790 4,190 5,180 6,460 7,420 8,510 9,470 11,0001,960 2,340 2,820 4,070 4,950 6,110 7,000 7,930 8,850 10,200

369 04270800

1

English River near Mooers Forks, NY

40.80 16 670 779 916 1,270 1,510 1,820 2,060 2,310 2,560 2,910

509 620 764 1,160 1,430 1,780 2,040 2,330 2,590 3,010650 762 898 1,250 1,490 1,810 2,050 2,320 2,570 2,950

370 04271815

1

Little Chazy River near Chazy, NY B

50.30 11 366 459 588 974 1,280 1,740 2,130 2,570 3,050 3,780

617 755 933 1,420 1,770 2,210 2,540 2,920 3,250 3,760408 504 643 1,080 1,440 1,920 2,300 2,730 3,140 3,770

Tables 7–10 121
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

371 04273500

1

Saranac River at Plattsburgh, NY

608.00 57 3,980 4,680 5,560 7,780 9,280 11,200 12,700 14,100 15,600 17,700

3,930 4,540 5,290 7,270 8,590 10,200 11,400 12,800 13,900 15,7003,980 4,680 5,550 7,750 9,220 11,100 12,500 13,900 15,400 17,400

372 04273700

1

Salmon River at South Plattsburgh, NY

63.30 36 498 648 860 1,530 2,080 2,920 3,660 4,490 5,420 6,850

704 875 1,100 1,730 2,180 2,760 3,180 3,660 4,080 4,740510 660 873 1,550 2,090 2,890 3,570 4,330 5,140 6,400

373 04273800

1

Little Ausable River near Valcour, NY

67.80 10 680 910 1,250 2,440 3,530 5,340 7,050 9,110 11,600 15,600

772 963 1,220 1,920 2,430 3,080 3,570 4,120 4,610 5,370697 919 1,240 2,300 3,160 4,420 5,500 6,770 8,210 10,500

374 04274000

1

West Branch Ausable River near Lake Placid, NY

116.00 66 2,430 2,860 3,410 4,930 6,050 7,600 8,840 10,200 11,600 13,700

2,000 2,390 2,870 4,180 5,090 6,250 7,110 8,090 8,930 10,3002,420 2,850 3,390 4,890 5,980 7,470 8,650 9,950 11,300 13,300

375 04275000

1

East Branch Ausable River at Au Sable Forks, NY

198.00 75 4,410 5,230 6,300 9,290 11,500 14,700 17,200 19,900 22,900 27,200

2,940 3,510 4,240 6,200 7,570 9,330 10,600 12,100 13,400 15,4004,370 5,190 6,240 9,150 11,200 14,200 16,600 19,100 21,800 25,800

376 04275500

1

Ausable River near Au Sable Forks, NY

446.00 68 7,150 8,380 9,950 14,300 17,500 21,800 25,400 29,100 33,100 38,900

5,580 6,670 8,040 11,700 14,300 17,500 19,900 22,600 24,800 28,5007,100 8,330 9,890 14,200 17,300 21,400 24,800 28,400 32,100 37,600

377 04276200

1

Bouquet River at New Russia, NY B

37.60 31 1,070 1,320 1,660 2,630 3,360 4,400 5,240 6,140 7,120 8,520

813 983 1,210 1,820 2,250 2,830 3,250 3,740 4,170 4,840

1,050 1,300 1,630 2,550 3,200 4,110 4,830 5,610 6,430 7,640

122 Magnitude and Frequency of Floods in New York
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

378 04276500

1

Bouquet River at Willsboro, NY

270.00 58 2,990 3,690 4,580 6,810 8,300 10,200 11,500 12,900 14,200 16,000

3,100 3,750 4,590 6,840 8,420 10,400 11,900 13,600 15,100 17,4002,990 3,690 4,580 6,810 8,310 10,200 11,500 13,000 14,300 16,200

379 04276770

1

Mill Brook at Port Henry, NY

27.00 11 437 545 683 1,050 1,300 1,640 1,890 2,150 2,410 2,770

412 507 633 980 1,230 1,550 1,790 2,060 2,300 2,670433 539 675 1,030 1,280 1,610 1,850 2,110 2,360 2,720

380 04276842

1

Putnam Creek East of Crown Point Center, NY

51.60 16 849 1,050 1,300 1,980 2,480 3,130 3,640 4,170 4,720 5,490

744 908 1,120 1,710 2,130 2,660 3,050 3,500 3,890 4,500836 1,030 1,280 1,930 2,400 2,990 3,440 3,930 4,410 5,110

381 04278300

1

Northwest Bay Brook near Bolton Landing, NY

22.00 34 745 877 1,030 1,390 1,610 1,860 2,030 2,190 2,350 2,540

389 472 583 886 1,100 1,380 1,590 1,830 2,040 2,360723 855 1,000 1,340 1,540 1,780 1,950 2,120 2,280 2,500

382 04279400

1

Poultney River Tributary at East Poultney, VT A

1.13 14 43 50 58 78 91 106 118 130 141 156

27 33 41 64 80 103 120 138 156 18341 48 56 75 88 105 119 133 147 167

383 04280200

1

Mettawee River Tributary 2 at East Ruppert, VT A

1.86 12 48 58 71 106 131 165 192 221 252 295

48 57 70 105 130 164 189 218 244 28448 58 71 105 131 165 191 220 249 290

384 04280300

1

Mettawee River Tributary near Pawlet, VT A

2.09 11 37 51 74 150 219 331 433 553 692 911

50 62 77 119 150 192 223 259 292 34239 53 74 142 197 277 345 422 508 643

Tables 7–10 123
Table 8.  Peak discharge for 10 selected recurrence intervals on rural, unregulated streams in New York, excluding Long Island.—Continued

[mi2, square miles; ft3/s, cubic feet per second. Hydrologic-region boundaries and station locations are shown in figure 2]

Map 

number

Station 

number 

and 

hydrologic 

region

Station name and location

Drainage 

area (mi2)

Number 

years 

of peak 

discharge 

record 

Peak-discharge (ft3/s) for recurrence interval (years)

(Top line is computed from log-Pearson type-III analysis; middle line is computed from 

the regression equations; bottom line is weighted average of first two discharges)

1.25 1.5 2 5 10 25 50 100 200 500

385 04280350

1

Mettawee River near Pawlet, VT A

70.20 17 1,260 1,590 2,040 3,400 4,490 6,080 7,430 8,920 10,600 13,100

1,630 1,960 2,380 3,530 4,350 5,420 6,230 7,160 7,970 9,2701,300 1,630 2,080 3,420 4,460 5,890 7,050 8,320 9,660 11,700

386 04280450

1

Mettawee River near Middle Granville, 

NY A

167.00 18 2,450 3,180 4,190 7,280 9,800 13,500 16,700 20,300 24,200 30,100

3,040 3,650 4,420 6,510 7,990 9,900 11,300 13,000 14,400 16,7002,510 3,230 4,210 7,150 9,400 12,500 15,000 17,900 20,800 25,400

387 04292500

1

Lamoille River at East Georgia, VT A

686.00 71 10,700 11,900 13,300 16,600 18,700 21,200 23,100 24,900 26,700 29,200

8,780 10,000 11,600 15,500 18,300 21,800 24,400 27,400 29,900 34,000

10,600 11,800 13,300 16,500 18,700 21,300 23,200 25,200 27,100 29,800

388 04292700

1

Stone Bridge Brook 

near Georgia Plains, VT A

8.45 23 93 124 169 318 449 659 849 1,070 1,330 1,740

152 187 234 365 460 584 679 785 882 1,030

98 129 174 324 451 642 805 991 1,200 1,530

A Regression and weighted discharges computed from New York full-regression equations. Out-of-State flood-frequency report and relations should be consulted because part or all of

 the drainage basin lies in an adjacent State.

B Annual peak-discharge record extended through two-station comparison method (U.S. Water Resources Council, 1981) or record was combined with record (adjusted for drainage

 area) from a nearby streamflow-gaging station on the same stream.

C Streamflow-gaging station with drainage area lying within two or more hydrologic regions of New York. The regression estimate was obtained by weighting the estimates from the regional equations by

 the relative percentage of drainage area in each hydrologic region of New York.

D Streamflow-gaging station currently on a regulated stream. Peak discharges and statistics reflect preregulation conditions and are not generally applicable to present conditions (See table 7 for period

 of unregulated record).

124 Magnitude and Frequency of Floods in New York
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

501 01300000 Blind Brook at Rye NY (U) Westchester 405900 734114 9.20 47 440 539 677 1,110 1,460 2,010 2,500 3,060 3,700 4,700502 01300500 Beaver Swamp Brook at 

Mamaroneck NY (U)

Westchester 405721 734307 4.71 46 91 102 116 157 188 232 269 308 352 417

503 01301000 Mamaroneck River at 

Mamaroneck NY (U)

Westchester 405714 734406 23.40 47 952 1,170 1,450 2,190 2,720 3,410 3,950 4,510 5,090 5,890

504 01301500 Hutchinson River at Pelham 

NY (U)

Westchester 405441 734855 5.76 46 174 203 240 333 396 477 539 602 666 754

505 01302000 Bronx River at 

Bronxville NY (U)

Westchester 405609 735010 26.50 47 704 845 1,020 1,480 1,800 2,200 2,510 2,830 3,150 3,590

506 01302500 Glen Cove Creek at 

Glen Cove NY (U)

Nassau 405148 733805 11.00 61 231 284 350 508 608 727 811 891 968 1,070

507 01303000 Mill Neck Creek at 

Mill Neck NY (U)

Nassau 405315 733351 11.50 63 38 44 53 76 94 118 138 160 183 217

508 01303500 Cold Spring Br at Cold 

Spring Harbor NY (U)

Nassau 405126 732750 7.30 48 16 22 31 61 87 126 159 198 240 304

509 01304000 Nissequogue River near 

Smithtown NY (U)

Suffolk 405058 731329 27.00 55 81 92 106 147 177 219 254 293 334 395

510 01304500 Peconic River at Riverhead 

NY (U)

Suffolk 405449 724114 75.00 58 64 73 85 114 135 163 185 207 231 265

511 01305000 Carmans River at 

Yaphank NY (U)

Suffolk 404949 725424 71.00 57 42 49 57 81 99 122 141 161 182 212

512 01305500 Swan River at East 

Patchogue NY (U)

Suffolk 404601 725939 8.80 53 28 32 36 47 54 62 68 74 80 89

513 01306000 a Patchogue River at 

Patchogue NY (U)

Suffolk 404556 730116 13.50 27 34 38 43 54 61 68 73 78 83 88

514 01306440 Connetquot Brook at 

Central Islip NY (U)

Suffolk 404733 730958 12.00 21 15 18 22 31 37 44 49 54 59 66

515 01306460 Connetquot Bk near 

Central Islip NY (U)

Suffolk 404619 730933 18.00 22 57 69 84 120 142 169 188 205 222 244

Tables 7–10 125
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

516 01306500 a Connetquot River near 

Oakdale NY (U)

Suffolk 404451 730903 24.00 53 64 72 82 111 133 164 189 217 247 290

517 01307000 Champlin Creek at 

Islip NY (U)

Suffolk 404413 731208 6.50 22 31 36 42 58 68 82 92 102 113 127

518 01307500 Penataquit Creek at 

Bay Shore NY (U)

Suffolk 404334 731441 5.00 31 34 38 43 54 61 69 74 79 84 91

519 01308000 Sampawams Creek at 

Babylon NY (U)

Suffolk 404215 731852 22.70 55 50 63 79 123 153 191 219 247 276 313

520 01308500 Carlls River at 

Babylon NY (U)

Suffolk 404231 731944 35.40 55 94 112 134 191 230 281 319 359 400 456

521 01309000 Santapogue Creek at 

Lindenhurst NY (U)

Suffolk 404130 732120 7.00 23 18 20 23 30 35 42 47 52 57 64

522 01309500 Massapequa Creek at 

Massapequa NY (U)

Nassau 404120 732719 38.00 63 74 100 135 240 320 431 520 614 713 851

523 01310000 a Bellmore Creek at 

Bellmore NY (U)

Nassau 404043 733058 17.00 42 38 47 59 91 114 144 168 192 218 252

524 01310500 East Meadow Brook at 

Freeport NY (U)

Nassau 403956 733413 31.00 63 171 230 309 523 669 854 990 1,120 1,250 1,420

525 01311000 Pines Brook at 

Malverne NY (U)

Nassau 403959 733935 10.00 63 77 114 167 339 479 680 844 1,020 1,210 1,470

526 01311500 Valley Stream at 

Valley Stream NY (U)

Nassau 403949 734218 4.50 46 94 112 134 190 227 276 312 349 387 438

527 01315000 Indian River near 

Indian Lake NY (R)

Hamilton 434530 741605 132.00 83 740 864 1,030 1,480 1,830 2,320 2,730 3,170 3,660 4,370

528 01325000 Sacandaga River at 

Stewarts Bridge near Hadley NY (R)

Saratoga 431841 735204 1,055.00 70 5,630 6,250 7,020 9,030 10,400 12,300 13,800 15,300 16,900 19,200

529 01327750 b Hudson River at 

Fort Edward NY (R)

Washington 431610 733547 2,817.00 23 18,700 21,000 23,800 30,100 34,100 39,000 42,500 45,900 49,200 53,600

530 01331095 b Hudson River at 

Stillwater NY (R)

Rensselaer 425608 733908 3,773.00 23 20,100 26,700 27,700 37,400 43,200 50,200 55,100 59,700 64,200 69,900

126 Magnitude and Frequency of Floods in New York
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

531 01335754 b Hudson River above Lock 1 

near Waterford NY (R)

Saratoga 424945 734000 4,611.00 46 29,400 32,800 37,300 50,100 59,900 73,800 85,300 97,800 112,000 132,000

532 01336000 Mohawk River below Delta 

Dam near Rome NY (R)

Oneida 431552 752612 152.00 72 1,530 1,900 2,390 3,790 4,840 6,310 7,500 8,770 10,100 12,100

533 01344000 West Canada Creek at 

Hinckley NY (R)

Oneida 431820 750710 375.00 40 4,920 5,730 6,720 9,210 10,900 13,000 14,600 16,100 17,800 19,900

534 01346000 West Canada Creek at Kast 

Bridge NY (R)

Herkimer 430408 745919 560.00 80 7,860 9,090 10,500 13,600 15,400 17,500 18,800 20,100 21,300 22,700

535 01347000 Mohawk River near Little 

Falls NY (R)

Herkimer 430053 744647 1,342.00 73 15,200 17,000 18,900 23,100 25,400 28,000 29,800 31,400 32,900 34,800

536 01349850 Batavia Kill at Hensonville 

NY (R)

Greene 421718 741255 13.50 18 580 688 838 1,320 1,740 2,400 3,000 3,720 4,560 5,910

537 01349900 b Batavia Kill near 

Ashland NY (R)

Greene 421736 741822 51.20 14 1,380 1,920 2,720 5,370 7,670 11,300 14,400 18,000 22,100 28,400

538 01350101 Schoharie Creek at 

Gilboa NY (R)

Schoharie 422350 742703 316.00 26 6,960 9,890 14,100 27,100 37,400 51,800 63,500 75,800 88,800 107,000

539 01350180 Schoharie Creek at North 

Blenheim NY (R)

Schoharie 422757 742745 358.00 29 7,050 10,100 14,400 28,000 38,700 53,800 66,000 78,900 92,500 112,000

540 01350355 Schoharie Creek at 

Breakabeen NY (R)

Schoharie 423213 742439 444.00 24 8,640 11,700 16,000 29,300 40,200 56,200 69,800 84,700 101,000 125,000

541 01351500 Schoharie Creek at 

Burtonsville NY (R)

Schenectady 424800 741548 886.00 60 13,100 16,300 20,500 32,800 42,200 55,500 66,400 78,100 90,800 109,000

542 01357500 Mohawk River at 

Cohoes NY (R)

Albany 424707 734229 3,450.00 86 42,500 49,600 58,200 79,400 93,200 110,000 123,000 136,000 148,000 165,000

543 01358000 Hudson River at 

Green Island NY (R)

Albany 424508 734122 8,090.00 54 69,500 81,000 94,400 124,000 142,000 162,000 176,000 188,000 200,000 215,000

544 01359513 Hunger Kill at Guilderland 

NY (U)

Albany 424122 735426 8.16 10 81 89 98 122 137 157 171 186 202 222

545 01364500 Esopus Creek at 

Mount Marion NY (R)

Ulster 420216 735821 419.00 35 5,940 7,020 8,500 13,000 16,700 22,200 27,100 32,700 39,000 48,800

Tables 7–10 127
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

546 01366500 Rondout Creek near 

Lackawack NY (R)

Ulster 414625 742401 100.00 16 157 255 432 1,290 2,360 4,610 7,210 10,900 16,000 25,700

547 01367500 Rondout Creek at 

Rosendale NY (R)

Ulster 415035 740511 383.00 55 7,940 9,850 12,200 18,300 22,200 27,200 30,800 34,400 37,900 42,500

548 01368713 Wawayanda Creek at 

Durland NY (R)

Orange 411644 741822 5.09 10 44 50 57 76 90 108 122 137 153 175

549 01368810 Wawayanda Creek at 

New Milford NY (R)

Orange 411417 742502 44.80 10 754 821 901 1,100 1,220 1,380 1,490 1,610 1,720 1,880

550 01374460 South Branch Minisceongo 

Creek at Letchworth Village NY (U)

Rockland 411213 740156 5.86 17 94 116 145 225 282 359 419 482 548 640

551 01375000 Croton River at Dam near 

Croton-on-hudson NY (R)

Westchester 411330 735135 378.00 66 1,730 2,340 3,260 6,520 9,590 14,700 19,700 25,700 32,900 44,800

552 01376280 Sparkill Creek at Sparkill 

NY (U)

Rockland 410144 735534 10.70 13 253 301 367 572 742 1,000 1,230 1,500 1,800 2,280

553 01376420 Saw Mill River at Elmsford 

NY (U)

Westchester 410319 734916 15.40 15 289 333 394 570 709 913 1,090 1,280 1,500 1,820

554 01376500 Saw Mill River at Yonkers 

NY (U)

Westchester 405611 735312 25.60 48 372 432 512 747 934 1,210 1,440 1,710 2,000 2,450

555 01376690 East Branch Hackensack 

River near Congers NY (U)

Rockland 410732 735724 6.90 12 189 240 312 537 727 1,020 1,280 1,570 1,910 2,430

556 01376800 Hackensack River at West 

NY Nyack NY (R)

Rockland 410544 735752 30.70 40 346 452 592 966 1,230 1,560 1,810 2,060 2,320 2,650

557 01377200 Pascack Brook Tributary at 

Spring Valley NY (U)

Rockland 410615 740157 4.19 18 147 182 228 360 460 598 711 832 962 1,150

558 01417000 East Branch Delaware River 

at Downsville NY (R)

Delaware 420430 745836 372.00 51 1,100 1,540 2,560 6,080 8,990 13,100 16,300 19,600 22,900 27,300

559 01417500 East Branch Delaware River 

at Harvard NY (R)

Delaware 420129 750713 458.00 41 2,550 3,320 4,420 7,980 11,100 15,800 20,100 25,000 30,800 39,600

560 01421000 East Branch Delaware River 

at Fishs Eddy NY (R)

Delaware 415823 751028 784.00 51 12,700 15,600 19,400 29,700 37,100 47,100 55,000 63,300 72,000 84,200

128 Magnitude and Frequency of Floods in New York
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

561 01425000 West Branch Delaware 

River at Stilesville NY (R)

Delaware 420429 752347 456.00 42 2,370 3,260 4,500 8,220 11,100 15,100 18,300 21,700 25,200 30,100

562 01426500 West Branch Delaware 

River at Hale Eddy NY (R)

Delaware 420011 752302 595.00 42 4,630 5,790 7,310 11,500 14,600 18,900 22,300 25,800 29,500 34,800

563 01427510 b Delaware River at Callicoon 

NY (R)

Wayne, Pa 414524 750328 1,820.00 30 22,400 27,700 35,000 55,000 69,800 90,300 107,000 124,000 143,000 169,000

564 01428500 Delaware River near 

Barryville NY (R)

Sullivan 413032 745910 2,020.00 42 25,200 30,900 38,300 59,100 74,600 96,300 114,000 133,000 153,000 182,000

565 01433500 Mongaup River near 

Mongaup NY (R)

Sullivan 412741 744533 200.00 41 1,170 1,580 2,220 4,630 7,050 11,300 15,700 21,200 28,200 40,400

566 01434000 Delaware River at Port 

Jervis NY (R)

Pike, Pa 412214 744152 3,070.00 42 32,800 40,100 49,800 77,700 99,200 130,000 155,000 183,000 213,000 257,000

567 01436000 Neversink River at 

Neversink NY (R)

Sullivan 414912 743809 92.60 52 266 504 881 2,480 4,150 7,040 9,780 13,000 16,900 22,900

568 01436500 b Neversink River at 

Woodbourne NY (R)

Sullivan 414524 743552 113.00 36 989 1,360 1,920 3,960 5,930 9,290 12,600 16,600 21,500 29,700

569 01437000 b Neversink River at Oakland 

Valley NY (R)

Sullivan 412945 743848 223.00 20 2,750 3,490 4,570 7,980 10,900 15,400 19,500 24,200 29,700 38,200

570 01437500 Neversink River at 

Godeffroy NY (R)

Orange 412628 743607 307.00 52 3,080 3,860 4,980 8,730 12,100 17,600 22,800 28,900 36,400 48,500

571 01500000 Ouleout Creek at East 

Sidney NY (R)

Delaware 422000 751407 103.00 50 1,500 1,610 1,750 2,170 2,480 2,930 3,300 3,690 4,130 4,760

572 01511500 Tioughnioga River at Itaska 

NY (R)

Broome 421753 755433 730.00 63 8,200 9,190 10,400 13,700 15,900 19,000 21,400 23,800 26,400 30,100

573 01520500 Tioga River at Lindley NY 

(R)

Steuben 420143 770757 771.00 20 8,550 9,450 10,400 12,400 13,500 14,600 15,400 16,000 16,600 17,300

574 01521500 Canisteo River at Arkport 

NY (R)

Steuben 422345 774242 30.60 60 610 647 701 879 1,030 1,260 1,460 1,690 1,960 2,370

575 01523500 Canacadea Creek near 

Hornell NY (R)

Steuben 422005 774100 57.90 51 1,010 1,190 1,440 2,200 2,840 3,810 4,670 5,670 6,810 8,600

Tables 7–10 129
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

576 01524500 Canisteo River at 

Hornell NY (R)

Steuben 421850 773905 158.00 51 2,110 2,440 2,870 4,070 4,970 6,230 7,260 8,370 9,580 11,300

577 01526500 Tioga River near 

Erwins NY (R)

Steuben 420716 770746 1,377.00 20 15,500 17,700 20,300 27,000 31,700 37,800 42,500 47,300 52,300 59,300

578 01529000 Mud Creek near Savona 

NY (R)

Steuben 421829 771150 76.60 47 456 584 758 1,280 1,700 2,300 2,810 3,370 3,980 4,890

579 01529950 Chemung River at Corning 

NY (R)

Steuben 420847 770328 2,005.00 20 21,100 24,100 27,800 37,300 43,700 52,200 58,600 65,300 72,200 81,600

580 01530332 b Chemung River at 

Elmira NY (R)

Chemung 420511 764805 2,162.00 12 22,100 25,200 29,300 40,300 48,600 60,000 69,300 79,400 90,200 106,000

581 01530500 Newtown Creek at 

Elmira NY (R)

Chemung 420616 764754 77.50 11 1,530 1,800 2,120 2,890 3,370 3,940 4,350 4,740 5,120 5,610

582 01531000 Chemung River at 

Chemung NY (R)

Chemung 420008 763806 2,506.00 21 27,200 30,900 35,600 48,600 58,200 71,500 82,300 93,800 106,000 124,000

583 03014500 Chadakoin River at 

Falconer NY (R)

Chautauqua 420645 791215 194.00 65 1,080 1,190 1,310 1,610 1,800 2,040 2,210 2,380 2,540 2,770

584 04216000 a Niagara River at 

Buffalo NY (R)

Erie 425240 785500 263,700 40 239,000 251,000 264,000 288,000 300,000 313,000 320,000 327,000 332,000 339,000

585 04216200 Scajaquada Creek at 

Buffalo NY (U)

Erie 425441 784745 15.40 37 742 871 1,040 1,520 1,890 2,420 2,860 3,340 3,860 4,640

586 04219000 a Erie Canal at Lock 30 at 

Macedon NY (R)

Wayne 430420 771745 0.00 38 343 393 455 614 724 868 979 1,090 1,210 1,370

587 0422028490 Slater Creek (Latta Road) 

near Greece NY (U)

Monroe 431510 773855 1.52 10 78 93 113 162 196 239 272 306 340 387

588 04222000 Caneadea Creek at 

Caneadea NY (R)

Allegany 422310 780945 62.00 19 679 893 1,230 2,630 4,200 7,290 10,700 15,600 22,200 35,100

589 04227500 Genesee River near 

Mount Morris NY (R)

Livingston 424600 775021 1,424.00 48 7,750 8,370 9,120 10,900 12,100 13,600 14,700 15,800 16,900 18,400

590 04228500 Genesee River at Avon NY 

(R)

Livingston 425504 774527 1,673.00 44 8,130 8,730 9,460 11,300 12,500 14,100 15,300 16,500 17,700 19,300

130 Magnitude and Frequency of Floods in New York
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

591 04232000 Genesee River at Rochester 

NY (R)

Monroe 431050 773740 2,467.00 48 14,400 15,800 17,500 21,300 23,600 26,400 28,400 30,300 32,200 34,600

592 04232050 Allen Creek near Rochester 

NY (U)

Monroe 430749 773108 30.10 41 576 680 814 1,190 1,470 1,860 2,170 2,510 2,880 3,410

593 04232482 Keuka Lake Outlet at 

Dresden NY (R)

Yates 424049 765715 207.00 34 889 1,130 1,440 2,230 2,760 3,430 3,910 4,390 4,860 5,480

594 04235000 Canandaigua Outlet at 

Chapin NY (R)

Ontario 425505 771359 195.00 60 554 642 746 983 1,130 1,290 1,410 1,520 1,630 1,760

595 04235500 Owasco Outlet near 

Auburn NY (R)

Cayuga 425648 763556 206.00 92 1,110 1,280 1,480 1,900 2,130 2,380 2,540 2,680 2,820 2,970

596 04237500 a Seneca River at 

Baldwinsville NY (R)

Onondaga 430925 761955 3,138.00 50 8,490 9,510 10,700 13,600 15,400 17,700 19,300 20,900 22,600 24,700

597 04239000 Onondaga Creek at Dorwin 

Ave, Syracuse NY (R)

Onondaga 425900 760904 88.50 48 875 1,050 1,270 1,840 2,230 2,740 3,120 3,510 3,910 4,440

598 04240010 Onondaga Creek at Spencer 

St. Syracuse NY (R)

Onondaga 430327 760946 110.00 29 1,400 1,640 1,930 2,680 3,190 3,860 4,370 4,890 5,420 6,160

599 04240105 Harbor Brook at Hiawatha 

Blvd. Syracuse NY (U)

Onondaga 430322 761107 11.30 29 351 406 471 628 728 851 941 1,030 1,120 1,230

600 04240120 Ley Creek at Park Street, 

Syracuse NY (U)

Onondaga 430438 761014 29.90 27 543 612 695 899 1,030 1,200 1,330 1,450 1,580 1,750

601 04240180 Ninemile Creek near 

Marietta NY (R)

Onondaga 425515 761947 45.10 35 168 221 288 451 552 668 746 818 885 965

602 04240200 Ninemile Creek at Camillus 

NY (R)

Onondaga 430221 761830 84.30 35 834 1,070 1,360 2,000 2,350 2,720 2,950 3,140 3,310 3,500

603 04240300 a Ninemile Creek at Lakeland 

NY (R)

Onondaga 430451 761336 115.00 28 918 1,030 1,170 1,490 1,680 1,920 2,090 2,260 2,420 2,640

604 04244000 Chittenango Creek near 

Chittenango NY (R)

Madison 430123 755132 66.30 20 1,100 1,410 1,790 2,760 3,390 4,150 4,690 5,210 5,710 6,340

605 04245236 Meadow Brook at Hurlburt 

Rd. Syracuse NY (U)

Onondaga 430230 760602 2.90 29 102 123 150 225 281 360 424 493 567 675

Tables 7–10 131
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

606 04246500 a Oneida River at Caughdenoy 

NY (R)

Oswego 431449 761012 1,382.00 80 6,120 6,710 7,420 9,170 10,300 11,800 12,800 13,900 15,000 16,600

607 04249000 Oswego River at Lock 7, 

Oswego NY (R)

Oswego 432706 763020 5,100.00 66 17,400 19,200 21,300 26,200 29,300 33,100 35,900 38,600 41,300 45,000

608 04253500 a Middle Branch Moose River 

at Old Forge NY (R)

Herkimer 434250 745810 55.00 65 305 342 390 524 625 767 884 1,010 1,150 1,350

609 04254000 Middle Branch Moose River 

near Mckeever NY (R)

Herkimer 433745 750455 151.00 43 1,060 1,180 1,320 1,680 1,920 2,230 2,470 2,700 2,950 3,280

610 04257000 a Beaver River below 

Stillwater Dam near Bvr River NY (R)

Herkimer 435356 750308 171.00 80 851 1,050 1,300 2,020 2,570 3,330 3,940 4,610 5,320 6,350

611 04258000 Beaver River at Croghan 

NY (R)

Lewis 435350 752416 291.00 69 1,650 1,870 2,150 2,890 3,420 4,140 4,720 5,330 5,980 6,900

612 04261000 a Oswegatchie River at 

Cranberry Lake NY (R)

St. Lawrence 441315 745100 140.00 60 684 813 961 1,270 1,440 1,620 1,740 1,840 1,930 2,030

613 04262000 Oswegatchie River near 

Oswegatchie NY (R)

St. Lawrence 441321 750429 259.00 56 2,060 2,270 2,520 3,150 3,570 4,090 4,490 4,890 5,290 5,840

614 04264331 a St. Lawrence River near 

Massena NY (R)

St. Lawrence 450022 744743 298,800 82 249,000 263,000 279,000 312,000 330,000 351,000 365,000 378,000 390,000 405,000

615 04266500 Raquette River at

Piercefield NY (R)

St. Lawrence 441405 743420 721.00 91 4,340 4,820 5,370 6,560 7,230 7,990 8,500 8,980 9,420 9,970

616 04267500 Raquette River at South 

Colton NY (R)

St. Lawrence 443042 745300 937.00 47 5,000 5,600 6,270 7,680 8,460 9,310 9,870 10,400 10,900 11,400

617 04268000 Raquette River at 

Raymondville NY (R)

St. Lawrence 445020 745845 1,125.00 56 5,620 6,400 7,310 9,350 10,600 12,000 13,000 13,900 14,800 15,900

618 04268600 East Br St. Regis River near 

Meacham Lake NY (R)

Franklin 443313 741833 52.20 10 258 293 339 471 571 714 833 963 1,110 1,320

619 04270500 Chateaugay River near 

Chateaugay NY (R)

Franklin 445435 740510 112.00 40 686 809 954 1,290 1,490 1,730 1,890 2,040 2,190 2,370

620 04270510 Chateaugay River below 

Chateaugay NY (R)

Franklin 445749 740753 151.00 31 1,370 1,650 2,040 3,220 4,180 5,620 6,890 8,320 9,950 12,500

132 Magnitude and Frequency of Floods in New York
Table 9.  Location, drainage area, period of record, and calculated peak discharge for 10 recurrence intervals for regulated streams, and streams in urbanized basins in

New York, including Long Island.—Continued[mi2, square miles; ft3/s, cubic feet per second. Locations are shown in figure 7]

Map 

number

Station number

Station name and code 

(U, urbanized 

drainage basin; 

R, regulated stream) County

Latitude 

(°/ '/ " )

Longitude 

(°/ '/ ")

Drainage 

area (mi2)

Number 

of years 

of peak 

discharge 

record

Peak-discharge (ft3/s) for 10 recurrence intervals (years)

1.25 1.5 2 5 10 25 50 100 200 500

621 04274500 Black Brook at Black 

Brook NY (R)

Clinton 442653 734448 49.40 37 334 398 475 657 770 905 1,000 1,090 1,180 1,290

622 04279000 a La Chute at Ticonderoga 

NY (R)

Essex 435038 732557 234.00 36 918 969 1,030 1,140 1,210 1,280 1,320 1,370 1,410 1,460

 a Flood-frequency estimates are based on annual maximum daily discharges only.b Annual peak-discharge record extended through two-station comparison method (U.S. Water Resources Council, 1981) or record was combined with record (adjusted for drainagearea) from a nearby gaging 

station on the same stream.Notes:Flood-frequencies for sites with significant regulation (R) were calculated from statistical analyses of annual peak discharges during the regulated period. No adjustments were made for the amount of available 

storage in the reservoirs before or during floods, or for changes in regulation procedures during the period of regulation. Other studies, such as flood-insurance studies, and other procedures, can be investigated for alternative methods of determining discharge frequencies at these sites.

Flood-frequencies for sites with significant urbanization (U) which have many years of record, may not represent current conditions as the degree of development may have increased significantly over time.

Tables 7–10 133
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

1 01197500 Housatonic River near Great Barrington MA 2 282.00 45.77 18.77 12.55 35.98 626.87 0.030 2.045 61.34 9.29 68.74 26.00 45.90 18.822 01199000 Housatonic River at Falls Village CT 2 634.00 67.79 10.81 6.45 24.12 642.03 0.017 4.956 50.02 9.41 70.52 25.13 45.08 17.603 01199050 Salmon Ck at Lime Rock CT 2 29.40 12.14 124.80 83.31 65.17 696.23 0.179 0.163 38.02 11.88 67.13 23.37 43.36 16.204 01199400 Webatuck Creek near South Amenia NY 2 81.00 24.09 18.42 7.05 19.05 638.31 0.029 1.896 9.68 7.29 56.06 23.84 43.99 15.795 01199420 Tenmile River near Wassaic NY 2 120.00 24.20 18.30 7.69 19.00 649.44 0.028 1.836 8.57 6.27 57.20 23.05 43.27 15.686 01199477 Stony Brook near Dover Plains NY 2 1.93 3.40 126.58 121.09 142.96 407.24 0.311 0.026 9.30 1.81 48.45 20.83 41.21 14.367 01200000 Tenmile River near Gaylordsville CT 2 203.00 37.41 14.08 7.71 21.54 686.09 0.021 2.669 6.50 5.46 65.27 22.60 43.07 14.888 01200500 Housatonic River at Gaylordsville CT 2 996.00 95.06 8.45 8.10 19.29 675.51 0.013 6.997 37.77 8.40 70.56 24.76 44.93 16.719 01208990 Saugatuck River near Redding CT 2 21.00 10.89 33.34 32.36 36.89 636.69 0.052 0.306 0.00 7.75 79.76 26.98 49.09 10.29

10 01209700 Norwalk River at South Wilton CT 2 30.00 18.04 30.17 27.16 42.58 427.39 0.071 0.515 0.00 7.23 66.77 26.64 48.93 9.7411 01311992 Arbutus Pond Outlet near Newcomb NY 1 1.22 1.99 153.24 0.00 460.97 638.82 0.240 0.093 100.00 14.57 85.43 26.29 42.33 24.7812 01312000 Hudson River near Newcomb NY 1 192.00 26.18 69.83 15.83 173.85 996.84 0.070 0.483 100.00 7.21 92.09 27.64 43.59 24.4013 01313500 Cedar River below Chain Lakes near Indian Lake 

NY

1 160.00 38.53 26.25 18.52 25.43 830.35 0.032 1.697 100.00 8.49 91.05 27.78 43.83 24.29

14 01314000 Hudson River at Gooley near Indian Lake NY 1 419.00 42.95 21.65 16.05 31.56 911.20 0.024 1.823 100.00 7.53 91.87 27.60 43.59 24.3715 01315500 Hudson River at North Creek NY 1 792.00 62.94 22.70 23.40 28.84 904.29 0.025 2.332 99.31 6.66 92.78 27.47 43.75 23.9816 01317000 Schroon River at Riverbank NY 1 527.00 49.62 5.16 3.19 23.43 969.62 0.005 4.906 60.34 5.06 93.32 21.92 39.74 22.0117 01318500 Hudson River at Hadley NY 1 1664.00 100.56 20.14 12.77 21.34 925.52 0.022 5.733 78.10 5.24 93.42 24.59 41.77 22.7518 01319000 East Branch Sacandaga River at Griffin NY 1 114.00 25.29 36.89 23.63 44.91 1106.90 0.033 0.752 100.00 4.22 95.60 27.41 44.73 22.1119 01319800 West Branch Sacandaga River at Arietta NY 1 28.90 9.57 81.20 37.94 137.71 888.05 0.091 0.130 100.00 8.94 90.89 32.08 49.86 21.2820 01319950 Sand Lake Outlet near Piseco NY 1 6.62 6.59 37.83 28.02 84.14 607.70 0.062 0.132 100.00 14.23 85.62 34.59 51.53 22.2421 01321000 Sacandaga River near Hope NY 1 491.00 38.11 23.74 46.79 17.26 922.01 0.026 1.290 98.03 8.35 91.12 30.03 47.40 22.0422 01325000 Sacandaga River at Stewarts Br near Hadley NY 1 1055.00 77.86 15.23 2.39 24.18 781.44 0.019 8.432 78.83 7.47 90.10 27.25 45.26 21.0923 01326500 Hudson River at Spier Falls NY 1 2779.00 112.88 17.82 12.42 22.39 865.44 0.021 6.373 77.04 6.11 92.03 25.52 43.07 22.0524 01328000 Bond Creek at Dunham Basin NY 1 14.10 9.98 20.66 31.36 13.63 212.97 0.097 0.459 0.00 7.33 30.85 17.38 35.57 19.5425 01328758 Pecks Creek at Fort Miller NY 1 2.38 3.74 50.36 40.16 31.07 199.41 0.253 0.103 0.00 3.05 23.83 15.67 35.57 18.78

134 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

26 01329000 Batten Kill at Arlington VT 1 152.00 22.16 67.98 5.89 185.30 946.08 0.072 0.619 62.18 2.11 83.62 30.96 49.68 24.3427 01329154 Steele Brook at Shushan NY 1 2.85 3.99 93.49 42.73 156.57 649.40 0.144 0.048 0.00 1.42 56.59 19.63 39.66 20.9528 01329500 Batten Kill at Battenville NY 1 394.00 48.53 9.34 7.82 51.69 1006.21 0.009 2.251 39.90 2.47 76.65 24.91 43.96 22.3829 01329780 Sessions Brook at Porters Corners NY 1 1.04 2.17 44.83 27.71 152.71 324.06 0.138 0.033 0.00 1.09 94.60 20.87 40.56 18.9430 01329900 Glowegee Creek Tributary at Mosherville NY 1 1.42 2.38 166.85 141.84 184.04 458.66 0.364 0.015 5.10 0.80 86.08 19.93 39.87 18.7131 01330000 Glowegee Creek at West Milton NY 1 26.00 13.43 38.46 26.04 31.95 360.90 0.107 0.450 1.45 7.37 76.43 19.05 39.07 18.3632 01330500 Kayaderosseras Creek near West Milton NY 1 84.20 22.32 21.92 19.31 36.94 428.32 0.051 0.804 10.95 5.66 83.93 19.96 39.81 18.6133 01330880 Saratoga Lake Tributary near Bemis Heights NY 1 2.98 3.88 25.78 28.73 44.75 354.60 0.073 0.105 0.00 9.99 62.78 15.34 35.33 17.3934 01331400 Dry Brook near Adams MA 1 7.67 5.29 169.34 140.48 161.86 639.63 0.265 0.035 98.59 3.06 75.01 30.98 49.95 22.2135 01331500 Hoosic River at Adams MA 1 46.70 13.50 12.93 19.85 128.21 837.58 0.015 0.260 71.49 5.74 72.30 29.50 48.64 21.2636 01332000 North Branch Hoosic River at North Adams MA 1 40.90 11.60 69.19 50.18 132.86 914.94 0.076 0.140 84.69 2.61 86.66 33.05 51.83 24.2937 01332500 Hoosic River near Williamstown MA 1 126.00 24.11 17.85 22.62 20.11 922.55 0.019 1.079 71.18 3.90 75.38 30.59 49.58 22.7438 01333000 Green River at Williamstown MA 1 42.60 13.94 67.66 42.86 142.45 1295.73 0.052 0.176 67.33 1.52 78.33 27.44 47.06 20.5639 01333367 Little Hoosic River at Cherryplain NY 1 2.22 3.03 381.62 200.34 841.63 1647.27 0.232 0.007 97.17 0.00 92.04 25.48 45.42 18.6240 01333500 Little Hoosic River at Petersburg NY 1 56.10 15.35 60.31 35.86 115.57 1191.58 0.051 0.234 67.41 0.29 91.73 23.03 43.12 19.1341 01333900 Paran Creek near South Shaftsbury VT 1 2.38 3.23 226.92 240.51 272.64 627.85 0.361 0.013 64.09 0.13 65.05 27.88 47.25 23.9742 01334000 Walloomsac River near North Bennington VT 1 111.00 18.77 120.43 75.39 137.67 819.06 0.147 0.182 59.48 2.13 75.29 28.92 47.91 23.6943 01334500 Hoosic River near Eagle Bridge NY 1 510.00 51.31 14.52 9.68 18.77 953.38 0.015 3.531 54.82 2.04 75.85 26.91 46.37 21.8244 01335500 Hudson River at Mechanicville NY 1 4500.00 159.96 14.00 8.28 21.09 810.26 0.017 11.172 57.97 5.26 82.37 24.24 42.54 21.4345 01342730 Steele Creek at Ilion NY 1 26.20 11.00 100.58 108.58 83.56 591.14 0.170 0.114 77.75 1.12 47.37 22.20 41.66 18.6746 01342797 Vly Brook near Morehouseville NY 1 3.28 4.53 51.38 24.50 84.30 333.93 0.154 0.097 100.00 18.07 78.47 34.98 50.37 23.6347 01342800 West Canada Creek at Nobleboro NY 1 193.00 31.18 36.06 52.62 31.13 812.28 0.044 0.751 100.00 8.35 91.32 35.21 52.55 24.0648 01346820 Mohawk River Tributary at Indian Castle NY 1 1.36 2.64 164.18 77.64 354.59 741.52 0.221 0.016 0.00 0.00 56.81 20.23 40.11 19.3049 01347460 Spruce Lake Tributary near Salisbury Center NY 1 0.54 1.29 109.49 138.88 145.34 343.89 0.318 0.009 100.00 0.19 99.61 30.05 47.75 21.1850 01348000 East Canada Creek at East Creek NY 1 289.00 39.09 38.63 37.90 52.01 547.97 0.070 0.861 79.58 9.96 82.12 30.83 48.63 21.19

Tables 7–10 135
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

51 01348420 North Creek near Ephratah NY 1 6.52 4.80 100.51 167.31 64.06 433.86 0.232 0.046 16.31 4.92 80.54 21.28 40.96 19.9052 01349000 Otsquago Creek at Fort Plain NY 1 61.00 17.56 73.94 36.13 141.81 443.20 0.167 0.241 20.36 0.15 34.01 20.45 40.20 18.6953 01349150 Canajoharie Creek near Canajoharie NY 1 59.70 17.56 25.85 3.66 99.27 456.79 0.057 0.813 26.37 0.78 37.21 20.56 40.00 18.1354 01349360 Van Wie Creek Tributary near Randall NY 1 1.00 1.65 218.06 138.39 334.86 378.73 0.576 0.008 0.00 0.00 51.72 17.51 37.51 18.6355 01349700 East Kill near Jewett Center NY 3 35.60 16.22 45.12 46.73 81.51 912.18 0.049 0.259 100.00 0.83 94.17 28.21 47.45 18.5256 01350000 Schoharie Creek at Prattsville NY 3 237.00 30.11 29.80 22.65 38.32 1094.20 0.027 0.987 99.68 0.54 91.80 27.49 46.75 18.7057 01350080 Manor Kill at West Conesville near Gilboa NY 3 32.40 9.61 82.17 30.64 187.11 748.88 0.110 0.125 100.00 0.27 86.41 19.70 39.15 17.3858 01350120 Platter Kill at Gilboa NY 3 10.90 7.39 122.33 171.66 107.79 655.05 0.187 0.054 99.33 0.77 85.76 16.86 36.82 17.0759 01350140 Mine Kill near North Blenheim NY 3 16.20 8.19 123.15 122.69 142.71 756.53 0.163 0.061 98.83 0.79 87.59 21.96 40.64 16.6160 01350900 Beaverdam Creek near Knox NY 3 6.91 4.50 72.00 80.22 71.44 283.56 0.254 0.059 76.98 1.67 49.00 16.86 36.95 16.1361 01351000 Fox Creek at West Berne NY 3 67.20 13.79 60.55 24.17 100.45 581.61 0.104 0.273 77.23 2.44 71.16 18.01 38.16 16.0362 01354300 Plotter Kill at Rynex Corners NY 1 3.70 3.11 87.58 134.46 74.64 313.63 0.279 0.031 39.29 4.14 61.79 15.48 35.53 16.7363 01355405 Indian Kill near Glenville Center NY 1 3.11 2.84 192.22 98.76 221.77 249.07 0.772 0.019 0.00 1.21 71.18 15.66 35.67 16.7764 01358500 Poesten Kill near Troy NY 2 89.40 22.03 64.75 25.88 89.40 506.24 0.128 0.447 53.68 5.54 74.51 18.43 38.42 16.5965 01359519 Normans Kill near Westmere NY 2 131.00 26.88 31.08 13.81 41.39 384.28 0.081 1.073 15.14 2.39 58.76 17.57 37.65 16.0366 01359528 Normans Kill at Albany NY 2 168.00 38.56 19.73 6.37 37.47 398.43 0.050 2.291 12.37 2.30 56.38 18.20 38.21 15.8867 01359750 Moordener Kill at Castleton-on-hudson NY 2 32.60 15.02 33.18 34.63 39.66 438.06 0.076 0.394 0.00 2.96 52.36 16.03 36.06 15.1568 01359902 Coeymans Creek near Selkirk NY 2 35.10 18.40 87.12 33.98 140.35 510.73 0.171 0.262 16.67 0.79 66.83 21.05 40.67 15.3869 01359924 Hannacrois Creek near New Baltimore NY 2 61.60 21.92 59.61 42.93 100.28 530.84 0.112 0.329 11.91 5.11 79.23 19.38 39.12 15.4670 01360640 Valatie Kill near Nassau NY 2 9.48 8.65 52.11 44.95 140.57 592.32 0.088 0.107 1.16 2.04 81.92 16.98 37.08 15.5571 01361000 Kinderhook Creek at Rossman NY 2 329.00 49.03 27.45 13.01 49.31 653.88 0.042 1.847 26.36 3.05 75.27 17.88 37.87 16.0672 01361200 Claverack Creek at Claverack NY 2 60.60 17.66 53.15 53.35 58.09 581.73 0.091 0.312 2.82 2.65 65.41 16.72 36.80 15.5373 01361453 Catskill Creek Tributary at Franklinton NY 2 3.61 3.66 251.74 244.18 293.72 768.27 0.328 0.014 99.97 0.08 94.28 17.19 36.99 16.6974 01361500 Catskill Creek at Oak Hill NY 2 98.00 18.64 49.89 39.78 100.74 826.36 0.060 0.289 79.07 1.42 86.73 18.52 38.69 16.7575 01361570 Tenmile Creek at Oak Hill NY 2 35.30 14.85 92.76 74.84 114.29 516.28 0.180 0.159 58.97 2.92 75.13 20.86 40.78 16.22

136 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

76 01361900 Shingle Kill at Cairo NY 2 13.90 8.71 190.25 78.60 445.27 929.38 0.205 0.046 35.52 0.45 90.55 28.53 47.66 16.7877 01362100 Roeliff Jansen Kill near Hillsdale NY 2 27.50 10.87 38.77 20.04 80.06 761.21 0.051 0.263 20.57 1.57 72.64 22.42 42.44 15.9678 01362197 Bushnellsville Creek at Shandaken NY 2 11.40 6.21 142.32 132.49 163.79 1720.11 0.083 0.042 99.16 0.04 99.42 30.24 50.06 19.9979 01362200 Esopus Creek at Allaben NY 2 63.70 14.09 83.39 49.66 186.05 1660.78 0.050 0.145 97.91 0.03 98.68 33.49 52.43 19.9980 01362500 Esopus Creek at Coldbrook NY 2 192.00 25.89 48.77 31.18 91.64 1634.78 0.030 0.474 85.90 0.26 97.78 31.57 50.89 20.0281 01365000 Rondout Creek near Lowes Corners NY 2 38.30 12.83 111.42 59.24 244.71 1473.33 0.076 0.105 95.50 0.08 98.95 33.95 51.74 19.8082 01365500 Chestnut Creek at Grahamsville NY 2 20.90 6.53 88.52 60.13 111.84 818.24 0.108 0.079 81.02 1.58 88.97 26.49 45.87 17.5683 01366500 Rondout Creek near Lackawack NY 2 100.00 23.89 58.07 24.89 121.34 1054.41 0.055 0.425 75.09 1.16 95.38 29.95 48.61 18.7184 01366650 Sandburg Creek at Ellenville NY 2 52.80 18.74 60.79 51.42 59.02 790.91 0.077 0.334 45.81 1.93 91.25 24.69 44.79 15.5185 01367500 Rondout Creek at Rosendale NY 2 383.00 54.01 23.73 8.32 46.64 772.23 0.031 2.564 40.67 2.16 89.09 26.92 46.55 17.5686 01368000 Wallkill River near Unionville NY 2 140.00 24.07 18.27 9.67 20.68 568.58 0.032 1.582 6.63 6.80 54.51 22.41 45.27 11.1787 01368500 Rutgers Creek at Gardnerville NY 2 59.70 17.84 29.97 5.46 43.81 422.98 0.071 1.049 3.80 3.26 58.27 20.26 42.23 12.1888 01369000 Pochuck Creek near Pine Island NY 2 98.00 30.10 31.10 11.62 56.70 611.71 0.051 1.115 15.87 7.25 61.87 22.91 45.06 11.0289 01369500 Quaker Creek at Florida NY 2 9.74 6.30 42.03 57.04 87.74 502.48 0.084 0.088 0.00 6.81 51.13 18.84 40.93 11.4890 01370000 Wallkill River at Pellets Island NY 2 380.00 39.07 24.21 3.38 42.32 515.75 0.047 2.836 7.18 5.61 53.78 21.42 43.78 11.4091 01370500 Wallkill River near Phillipsburg NY 2 406.00 43.88 22.18 2.50 38.62 502.91 0.044 3.724 6.58 5.34 52.78 21.11 43.44 11.4792 01371000 Shawangunk Kill at Pine Bush NY 2 104.00 32.02 21.58 11.00 31.35 466.46 0.046 1.625 9.80 2.35 72.38 20.87 41.99 13.8093 01371400 Shawangunk Kill at Ganahgote NY 2 147.00 44.28 17.47 9.19 27.90 484.69 0.036 2.580 10.24 2.32 72.25 21.05 42.04 14.2294 01371500 Wallkill River at Gardiner NY 2 695.00 71.35 9.98 5.95 26.44 460.31 0.022 5.168 6.03 4.47 56.25 20.39 42.31 12.4195 01372040 Crum Elbow Creek at Hyde Park NY 2 17.30 14.17 17.09 9.35 45.28 471.81 0.036 0.647 0.00 4.09 81.23 17.98 38.90 15.4796 01372200 Wappinger Creek near Clinton Corners NY 2 92.40 17.44 15.21 18.64 3.62 566.76 0.027 1.830 0.69 3.73 69.01 19.95 40.62 15.2697 01372300 Little Wappinger Creek at Salt Point NY 2 32.90 17.30 21.80 13.95 32.43 557.15 0.039 0.774 0.00 4.34 80.90 19.57 40.13 15.5198 01372500 Wappinger Creek near Wappingers Falls NY 2 181.00 33.58 11.80 6.62 15.80 531.34 0.022 2.968 0.34 3.87 68.64 19.41 40.09 15.0799 01372800 Fishkill Creek at Hopewell Junction NY 2 57.30 21.00 17.12 12.67 27.53 619.92 0.028 1.063 2.23 4.97 70.32 21.29 42.26 12.96

100 01373500 Fishkill Creek at Beacon NY 2 190.00 32.81 14.98 6.28 26.64 606.83 0.025 2.312 1.37 4.97 67.99 21.47 42.35 12.90

Tables 7–10 137
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

101 01373690 Woodbury C near Highland Mills NY 2 11.20 6.05 127.79 90.53 283.83 689.06 0.185 0.037 6.50 3.96 74.58 26.72 48.00 11.07102 01374130 Canopus Creek at Oscawana Corners NY 2 8.30 8.05 105.04 78.36 58.34 1019.47 0.103 0.117 1.36 3.99 94.59 26.35 47.31 11.34103 01374250 Peekskill Hollow Creek at Tompkins Corners NY 2 14.90 7.34 79.43 76.66 52.02 984.04 0.081 0.114 0.09 7.29 88.60 25.81 46.82 11.35104 01374440 Cedar Pond Brook at Stony Point NY 2 17.30 8.27 159.10 105.55 161.91 862.56 0.184 0.063 1.27 3.73 84.37 28.09 49.69 10.33105 01384500 Ringwood Creek near Wanaque NJ 2 19.10 11.20 56.31 76.69 33.21 903.60 0.062 0.217 2.77 7.59 89.49 26.74 48.65 10.42106 01386000 West Brook near Wanaque NJ 2 11.80 5.56 165.01 186.07 106.24 726.26 0.227 0.039 0.04 1.35 86.99 27.90 49.77 10.15107 01387250 Ramapo River at Sloatsburg NY 2 60.10 18.68 17.73 16.24 34.55 818.13 0.022 0.755 2.80 5.69 80.08 27.61 49.06 10.68108 01387300 Stony Brook at Sloatsburg NY 2 18.20 10.42 75.23 100.29 86.56 809.51 0.093 0.111 5.31 7.27 91.99 28.22 50.06 10.26109 01387350 Nakoma Brook at Sloatsburg NY 2 5.40 3.86 97.72 136.16 120.62 826.28 0.118 0.030 0.00 8.01 87.71 26.39 48.32 10.11110 01387400 Ramapo River at Ramapo NY 2 86.90 21.60 17.07 18.00 21.39 824.81 0.021 1.048 3.05 5.98 83.17 27.66 49.24 10.54111 01387410 Torne Brook at Ramapo NY 2 2.60 3.51 229.94 180.64 281.50 1027.23 0.224 0.015 0.73 0.00 97.10 27.71 49.66 10.02112 01387420 Ramapo River at Suffern NY 2 93.00 23.63 17.59 20.32 18.66 826.07 0.021 1.154 2.87 5.65 83.71 27.61 49.21 10.50113 01387450 Mahwah River near Suffern NY 2 12.30 8.30 119.19 17.32 226.77 715.14 0.167 0.128 1.17 3.07 61.62 27.91 49.94 9.96114 01387500 Ramapo River near Mahwah NJ 2 120.00 25.28 17.58 20.34 17.68 760.59 0.023 1.267 2.31 5.04 75.29 27.61 49.31 10.35115 01413500 East Branch Delaware River at Margaretville NY 3 163.00 20.52 11.69 13.98 14.03 1218.35 0.010 1.367 100.00 0.17 90.27 27.57 46.29 17.87116 01414000 Platte Kill at Dunraven NY 3 34.90 12.48 61.57 54.62 116.93 1212.55 0.051 0.154 100.00 0.01 85.97 24.70 43.32 16.17117 01414500 Mill Brook near Dunraven NY 3 25.20 11.41 111.77 88.82 186.67 1337.22 0.084 0.088 100.00 0.02 95.99 28.84 47.22 17.01118 01415000 Tremper Kill near Andes NY 3 33.20 11.59 70.22 42.16 166.22 1118.92 0.063 0.136 100.00 0.40 83.55 24.38 42.90 15.52119 01415500 Terry Clove Kill near Pepacton NY 3 13.60 6.19 102.03 58.04 172.16 1137.15 0.090 0.061 100.00 0.11 82.96 25.42 43.91 15.11120 01417000 East Branch Delaware River at Downsville NY 3 372.00 40.55 6.99 1.16 12.09 1197.70 0.006 7.630 99.99 0.08 90.36 26.02 44.67 16.71121 01417185 Campbell Brook Tributary near Downsville NY 3 0.41 1.06 607.64 591.95 617.54 954.63 0.637 0.002 100.00 0.00 98.22 23.88 43.68 14.88122 01417500 East Branch Delaware River at Harvard NY 3 458.00 54.80 10.54 12.76 10.63 1228.90 0.009 4.332 98.48 0.06 91.10 25.65 44.41 16.33123 01418000 Beaver Kill near Turnwood NY 3 40.80 14.76 68.09 49.10 99.01 1203.01 0.057 0.209 100.00 0.77 98.36 35.68 53.58 17.21124 01418500 Beaver Kill at Craigie Clair NY 3 81.90 25.40 47.95 34.99 70.26 1156.89 0.041 0.502 100.00 0.50 97.68 32.71 51.00 16.42125 01419500 Willowemoc Creek near Livingston Manor NY 3 62.60 19.05 48.42 36.23 105.03 776.67 0.062 0.303 100.00 2.05 95.32 32.82 51.24 16.58

138 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

126 01420000 Little Beaver Kill near Livingston Manor NY 3 20.10 8.97 76.75 86.58 57.12 592.64 0.130 0.126 100.00 3.73 90.48 30.35 49.60 16.02127 01420500 Beaver Kill at Cooks Falls NY 3 241.00 36.14 37.54 26.49 58.85 937.23 0.040 0.891 99.91 1.30 94.73 30.50 49.14 16.06128 01421000 East Branch Delaware River at Fishs Eddy NY 3 784.00 62.32 9.82 12.55 9.39 1141.52 0.009 5.253 98.14 0.47 92.79 26.94 45.69 16.05129 01421900 West Branch Delaware River Upstream From 

Delhi NY

4 134.00 26.71 22.91 9.43 51.67 904.45 0.025 1.139 100.00 0.32 73.67 24.42 43.76 15.85

130 01422500 Little Delaware River near Delhi NY 4 49.80 15.59 49.86 32.72 75.42 1015.98 0.049 0.307 100.00 0.41 81.29 26.09 44.95 15.63131 01423000 West Branch Delaware River at Walton NY 4 332.00 46.73 13.04 8.33 27.98 955.08 0.014 2.842 99.96 0.30 75.36 24.57 43.99 15.40132 01423500 Dryden Brook near Granton NY 4 8.10 5.79 135.66 102.81 215.20 1070.51 0.127 0.039 99.95 0.03 87.61 24.09 42.09 14.29133 0142400103 Trout Creek near Trout Creek NY 4 20.20 8.13 73.19 52.69 119.94 837.75 0.087 0.101 99.03 0.10 80.58 23.65 42.11 14.47134 01424500 Trout Creek at Cannonsville NY 4 49.50 15.06 48.40 9.37 98.77 925.08 0.052 0.468 94.77 3.04 81.74 23.18 42.09 14.37135 01425000 West Branch Delaware River at Stilesville NY 4 456.00 69.45 7.53 2.95 17.38 995.73 0.008 8.155 97.11 0.21 79.17 24.22 43.49 15.09136 01425500 Cold Spring Brook at China NY 4 1.49 1.96 285.97 244.95 355.83 831.07 0.344 0.007 100.00 0.00 99.93 24.06 42.11 14.08137 01425675 Oquaga Creek near North Sanford NY 4 4.69 3.86 134.34 83.50 222.50 646.11 0.208 0.028 100.00 1.42 85.70 24.27 42.21 14.11138 01426000 Oquaga Creek at Deposit NY 4 67.60 19.06 37.32 19.68 67.10 852.88 0.044 0.508 94.57 0.56 85.67 22.54 41.17 13.66139 01426500 West Branch Delaware River at Hale Eddy NY 4 595.00 76.74 9.31 8.11 16.18 974.35 0.010 6.134 95.86 0.35 80.56 23.82 43.00 14.77140 01427500 Callicoon Creek at Callicoon NY 3 110.00 21.98 33.16 25.23 64.33 714.29 0.046 0.531 80.76 1.71 72.93 22.27 41.38 14.63141 01428000 Tenmile River at Tusten NY 3 45.60 14.63 26.61 30.98 44.86 503.30 0.053 0.382 48.92 3.46 84.47 20.01 39.72 13.77142 01428500 Del River above Lackawaxen River near 

Barryville NY

3 2020.00 139.56 6.71 5.29 7.48 973.32 0.007 19.117 89.31 1.58 86.17 24.57 43.60 14.97

143 01428750 West Br Lackawaxen River near Aldenville PA 3 40.60 13.66 63.57 60.91 38.14 578.07 0.110 0.277 100.00 1.83 74.10 25.88 45.30 13.02144 01434000 Delaware River at Port Jervis NY 3 3070.00 165.40 6.78 6.26 8.62 810.21 0.008 19.795 86.40 3.63 84.58 24.02 43.34 14.36145 0143400680 East Branch Neversink River Northeast of 

Denning NY

3 8.93 6.16 169.06 103.29 305.34 1451.39 0.116 0.034 100.00 0.00 100.00 40.19 58.57 20.34

146 01434010 East Branch Neversink River at Denning NY 3 13.30 7.80 135.14 76.32 244.63 1350.68 0.100 0.057 100.00 0.00 99.93 39.93 58.13 20.23147 01434017 East Branch Neversink River near Claryville NY 3 22.90 12.96 89.00 59.79 162.03 1238.43 0.072 0.130 100.00 0.00 99.75 38.36 56.06 19.84148 01434021 West Branch Neversink River at 

Winnisook Lake near Frost Valley NY

3 0.77 1.63 729.47 431.03 1135.57 1596.58 0.457 0.002 100.00 0.00 100.00 40.35 59.99 20.42

149 01434025 Biscuit Brook above Pigeon Brook at 

Frost Valley NY

3 3.72 3.44 387.59 169.90 699.68 1401.98 0.276 0.010 100.00 0.00 100.00 40.73 59.79 19.76

150 01434092 Shelter Creek below Dry Creek near 

Frost Valley NY

3 0.62 1.27 596.99 510.47 842.63 1054.67 0.566 0.002 100.00 0.00 100.00 38.66 55.93 19.43

Tables 7–10 139
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

151 01434498 West Branch Neversink River at Claryville NY 3 33.80 14.46 75.78 45.91 178.14 1215.07 0.062 0.158 100.00 0.15 99.49 38.89 56.83 19.27152 01435000 Neversink River near Claryville NY 3 66.60 17.91 69.69 49.03 124.07 1196.49 0.058 0.226 100.00 0.09 99.30 37.54 55.43 19.30153 01436000 Neversink River at Neversink NY 3 92.60 27.12 44.02 15.77 85.49 1052.62 0.042 0.712 100.00 0.06 97.93 34.95 53.13 18.62154 01436500 Neversink River at Woodbourne NY 3 113.00 33.10 41.44 25.86 75.25 968.85 0.043 0.731 99.72 0.18 94.92 33.24 51.70 18.26155 01437000 Neversink River at Oakland Valley NY 3 223.00 56.66 26.10 19.90 40.98 731.83 0.036 1.913 93.65 2.73 89.84 28.77 47.99 16.47156 01437500 Neversink River at Godeffroy NY 3 307.00 62.26 27.03 24.83 44.10 710.88 0.038 1.824 80.21 3.50 89.92 27.38 46.94 15.72157 01438500 Delaware River at Montague NJ 3 3480.00 174.38 6.78 6.28 8.85 795.14 0.009 20.582 84.17 3.70 84.98 24.26 43.66 14.42158 01440000 Flat Brook near Flatbrookville NJ 2 64.00 25.45 36.06 12.44 56.54 624.14 0.058 0.915 16.39 4.26 87.89 23.82 45.89 11.73159 01443500 Paulins Kill at Blairstown NJ 2 126.00 30.23 7.23 8.99 8.75 503.53 0.014 3.062 1.93 8.22 59.95 21.93 44.77 11.15160 01496370 Mink Creek at Richfield Springs NY 4 10.40 6.95 49.38 45.02 85.06 357.81 0.138 0.110 100.00 7.38 29.78 23.93 42.36 18.08161 01496500 Oaks Creek at Index NY 4 102.00 29.87 12.47 7.33 28.01 558.17 0.022 1.921 99.77 7.75 49.75 23.19 41.87 17.69162 01497500 Susquehanna River at Colliersville NY 4 349.00 46.26 9.13 4.71 13.28 633.05 0.014 5.123 94.92 5.85 60.00 21.64 40.57 17.29163 01497800 Schenevus Creek at Schenevus NY 4 54.20 19.03 42.01 12.63 85.51 895.83 0.047 0.554 100.00 1.28 74.98 20.12 39.29 16.66164 01497805 Little Elk Creek near Westford NY 4 3.73 5.07 139.65 86.39 168.16 700.11 0.199 0.042 100.00 0.33 75.89 19.97 39.14 16.79165 01498500 Charlotte Creek at West Davenport NY 4 167.00 27.90 26.72 10.61 56.99 678.78 0.039 1.075 99.78 1.30 79.13 21.67 40.74 16.09166 01499000 Otego Creek near Oneonta NY 4 108.00 27.25 18.53 9.98 40.56 633.25 0.029 1.275 91.14 1.41 70.75 21.44 40.48 16.31167 01500500 Susquehanna River at Unadilla NY 4 982.00 73.98 5.76 4.94 11.13 686.80 0.008 8.715 93.71 2.81 69.58 21.42 40.51 16.41168 01501000 Unadilla River near New Berlin NY 4 199.00 36.85 8.72 3.09 27.15 552.54 0.016 3.434 90.54 1.88 58.92 22.15 41.17 17.71169 01501015 Mill Brook at New Berlin NY 4 4.64 4.24 113.57 128.39 117.53 567.78 0.200 0.034 97.97 1.85 56.81 20.79 40.10 16.40170 01501140 Wharton Creek Trib near Edmeston NY 4 2.02 3.28 130.87 156.84 105.75 653.83 0.200 0.025 100.00 1.46 60.90 23.50 42.11 17.06171 01501500 Sage Brook near South New Berlin NY 4 0.61 1.54 265.32 302.36 233.63 605.16 0.438 0.006 100.00 0.00 97.41 20.88 40.02 15.85172 01502000 Butternut Creek at Morris NY 4 59.70 22.62 27.09 18.61 47.66 616.00 0.044 0.732 95.54 1.17 69.63 22.78 41.53 16.54173 01502500 Unadilla River at Rockdale NY 4 520.00 62.74 4.06 4.02 10.86 593.67 0.007 8.134 88.80 1.47 63.68 22.00 41.02 16.85174 01502632 Susquehanna River at Bainbridge NY 4 1610.00 84.59 5.03 3.99 10.06 654.57 0.008 11.393 91.36 2.23 67.77 21.63 40.72 16.44175 01502701 Susquehanna River at Afton NY 4 1716.00 90.87 4.61 3.50 9.31 650.63 0.007 13.338 91.04 2.16 68.11 21.66 40.74 16.32

140 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

176 01502714 Ouaquaga Creek near Belden NY 4 3.37 3.56 124.05 86.39 187.18 484.55 0.256 0.028 100.00 1.11 63.62 19.84 38.69 13.54177 01502731 Susquehanna River at Windsor NY 4 1820.00 110.52 4.08 2.48 8.25 648.00 0.006 19.472 89.86 2.09 68.46 21.59 40.66 16.12178 01503000 Susquehanna River at Conklin NY 4 2232.00 136.79 4.05 2.39 6.60 677.49 0.006 26.961 89.28 2.03 70.59 21.67 40.75 15.56179 01503960 Electric Light Stream near Morrisville NY 4 7.21 7.38 68.10 57.44 73.77 552.76 0.123 0.112 100.00 1.03 73.94 23.33 42.01 18.50180 01503980 Chenango River at Eaton NY 4 24.30 11.55 29.37 20.62 78.48 509.02 0.058 0.279 99.01 3.31 55.26 22.69 41.53 18.51181 01505000 Chenango River at Sherburne NY 4 263.00 28.14 8.44 9.46 13.52 572.91 0.015 2.283 85.09 2.92 60.24 21.15 40.39 17.66182 01505017 Cold Brook near North Norwich NY 4 5.80 7.28 95.64 63.86 130.68 821.46 0.116 0.079 96.25 0.35 78.29 22.61 41.14 16.38183 01505500 Canasawacta Creek near South Plymouth NY 4 57.90 14.54 56.60 40.32 82.61 566.92 0.100 0.247 98.08 0.92 80.36 23.41 42.12 16.38184 01507000 Chenango River at Greene NY 4 593.00 69.92 5.09 3.03 7.72 560.94 0.009 11.798 83.95 1.78 67.98 21.23 40.35 16.51185 01507500 Genegantslet Creek at Smithville Flats NY 4 82.30 18.50 46.37 31.29 73.17 396.70 0.117 0.378 94.88 1.57 83.78 22.42 41.23 15.53186 01508000 Shackham Brook near Truxton NY 4 3.16 3.17 172.59 140.20 181.14 825.06 0.209 0.020 100.00 0.93 99.00 24.19 43.24 17.99187 01508500 Albright Creek at East Homer NY 4 6.81 6.51 111.26 90.65 129.69 717.09 0.155 0.060 99.56 0.00 71.09 23.62 42.33 17.28188 01508803 West Branch Tioughnioga River at Homer NY 4 71.50 17.92 15.92 8.87 40.71 606.35 0.026 0.883 84.06 2.76 59.55 21.94 41.12 17.29189 01508946 Otter Creek Tributary at State Hwy 222 near 

Cortland NY

4 2.85 3.59 98.12 62.65 182.52 433.03 0.227 0.033 100.00 0.11 35.60 21.45 40.65 16.16

190 01509000 Tioughnioga River at Cortland NY 4 292.00 33.07 11.26 5.02 30.06 654.69 0.017 2.419 89.53 1.49 65.70 23.67 42.67 17.41191 01509520 Tioughnioga River at Lisle NY 4 453.00 54.91 7.44 5.16 14.37 645.79 0.012 5.643 88.43 1.15 66.10 23.83 42.72 16.71192 01510000 Otselic River at Cincinnatus NY 4 147.00 33.25 17.79 16.08 26.20 683.47 0.026 1.542 93.46 0.68 77.94 24.29 43.23 17.08193 01510500 Otselic River near Upper Lisle NY 4 217.00 44.51 13.10 7.77 22.29 628.13 0.021 3.115 90.28 0.63 75.29 23.99 42.94 16.67194 01510610 Merrill Creek Tributary near Texas Valley NY 4 5.32 5.59 69.04 62.38 76.16 500.64 0.138 0.080 98.29 0.05 59.29 23.81 43.10 15.62195 01511500 Tioughnioga River at Itaska NY 4 730.00 61.79 7.01 6.45 12.79 631.92 0.011 6.096 87.21 0.54 69.24 23.71 42.63 16.54196 01512500 Chenango River near Chenango Forks NY 4 1483.00 80.21 4.80 2.97 6.87 586.86 0.008 14.353 84.89 1.46 69.22 22.43 41.41 16.35197 01513500 Susquehanna River at Vestal NY 4 3941.00 155.90 3.73 2.19 5.41 637.70 0.006 34.493 85.95 1.79 69.72 21.78 40.81 15.72198 01513712 Nanticoke Creek Tributary at Nanticoke NY 5 1.70 2.18 139.88 132.88 214.49 500.12 0.280 0.013 95.11 0.04 54.80 19.24 38.25 13.56199 01513790 Nanticoke Creek at Union Center NY 5 90.70 18.09 29.31 19.21 45.98 575.91 0.051 0.587 74.53 0.42 67.41 18.72 37.79 13.17200 01513831 Susquehanna River at Owego NY 5 4216.00 170.69 3.49 2.24 4.98 637.44 0.005 38.772 84.85 1.74 69.79 21.65 40.69 15.51

Tables 7–10 141
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

201 01514000 Owego Creek near Owego NY 5 185.00 35.87 16.67 12.79 36.83 712.71 0.023 1.571 79.17 0.18 74.75 19.46 38.39 13.17202 01514801 Catatonk Creek Northwest of Owego NY 5 150.00 29.95 12.85 9.10 27.10 743.11 0.017 1.778 68.34 0.77 76.28 17.13 35.80 11.89203 01515000 Susquehanna River near Waverly NY 5 4773.00 189.96 2.76 1.94 4.25 643.93 0.004 48.309 83.06 1.63 69.99 21.27 40.29 15.13204 01516500 Corey Creek near Mainesburg PA 5 12.20 7.27 133.99 47.55 294.50 747.03 0.179 0.061 100.00 0.42 47.62 15.08 34.44 11.56205 01516800 Manns Creek near Mansfield PA 5 3.01 3.67 157.09 136.56 239.04 748.03 0.210 0.020 99.90 0.21 52.09 13.82 32.61 11.71206 01517000 Elk Run near Mainesburg PA 5 10.20 8.13 103.57 40.75 237.14 766.52 0.135 0.081 100.00 0.08 50.57 14.50 34.01 11.49207 01518000 Tioga River at Tioga PA 5 282.00 38.20 28.08 13.97 49.95 755.65 0.037 1.383 97.71 0.30 66.08 15.61 34.83 11.63208 01518420 Crooked Creek at Middlebury Center PA 5 74.30 14.05 48.04 26.77 85.47 878.54 0.055 0.287 99.00 0.31 55.42 13.85 32.99 11.92209 01518500 Crooked Creek at Tioga PA 5 122.00 23.13 25.24 8.49 54.96 921.53 0.027 1.004 95.74 1.30 60.28 13.54 32.68 11.86210 01518862 Cowanesque River at Westfield PA 5 90.60 15.70 52.91 33.67 79.93 878.83 0.060 0.296 100.00 0.23 62.90 18.61 37.56 12.42211 01519200 Cowanesque River at Elkland PA 5 235.00 31.54 27.71 14.78 53.34 853.63 0.032 1.077 98.75 0.14 63.39 15.87 35.02 12.12212 01520000 Cowanesque River near Lawrenceville PA 5 298.00 43.08 19.64 11.47 40.41 822.35 0.024 1.896 96.06 0.12 62.80 15.02 34.28 12.02213 01520500 Tioga River at Lindley NY 5 771.00 50.04 23.29 8.67 46.01 804.78 0.029 2.346 95.28 0.26 63.82 14.75 34.01 11.81214 01521596 Big Creek near Howard NY 5 6.32 4.27 97.16 86.85 92.07 548.97 0.177 0.047 100.00 0.12 53.33 14.41 33.66 11.66215 01522500 Karr Valley Creek at Almond NY 5 27.40 8.34 99.53 63.90 127.23 679.01 0.147 0.091 100.00 0.21 80.64 16.55 35.54 11.99216 01523500 Canacadea Creek near Hornell NY 5 57.90 13.87 62.90 33.07 108.97 740.03 0.085 0.227 99.92 0.12 78.34 16.27 35.29 11.94217 01525000 Bennett Creek at Canisteo NY 5 95.30 19.73 49.46 34.13 81.53 923.27 0.054 0.366 99.03 0.07 77.00 15.66 34.79 11.92218 01525500 Canisteo River at West Cameron NY 5 340.00 37.36 16.25 5.13 43.18 826.44 0.020 2.270 94.91 0.32 72.92 14.84 33.94 11.81219 01526000 Tuscarora Creek near South Addison NY 5 114.00 21.05 37.88 35.57 61.09 659.05 0.057 0.442 98.89 0.21 58.82 12.29 31.64 11.70220 01526500 Tioga River near Erwins NY 5 1377.00 61.11 8.82 4.26 21.50 790.03 0.011 5.615 94.33 0.31 66.51 14.32 33.57 11.77221 01527000 Cohocton River at Cohocton NY 5 52.20 18.93 28.59 5.76 61.67 793.57 0.036 0.920 100.00 0.67 57.10 14.80 33.75 11.95222 01528000 Fivemile Creek near Kanona NY 5 66.80 22.52 14.09 13.14 31.97 497.95 0.028 1.043 99.58 0.74 64.37 15.85 34.35 11.89223 01528320 Cohocton River at Bath NY 5 316.00 36.14 13.81 9.61 30.26 695.79 0.020 1.985 97.94 0.58 60.74 15.26 33.98 11.81224 01529500 Cohocton River near Campbell NY 5 470.00 47.46 10.50 9.55 20.97 665.13 0.016 3.117 90.78 1.34 61.41 14.73 33.40 11.74225 01530301 Cuthrie Run near Big Flats NY 5 5.39 4.01 174.78 133.31 223.93 770.09 0.227 0.023 97.92 0.00 88.79 13.79 32.50 11.32

142 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

226 01530500 Newtown Creek at Elmira NY 5 77.50 20.63 33.73 19.66 51.66 591.89 0.057 0.625 68.19 0.39 63.39 15.17 34.37 11.27227 01531000 Chemung River at Chemung NY 5 2506.00 99.19 4.72 4.60 11.52 748.35 0.006 11.848 89.14 0.60 66.33 14.23 33.31 11.65228 01533250 Tuscarora Creek near Silvara PA 5 11.80 5.77 79.47 39.44 88.55 722.20 0.110 0.096 76.75 1.95 62.91 16.20 35.55 11.92229 01542810 Waldy Run near Emporium PA 5 5.24 5.13 134.69 112.73 239.67 1358.74 0.099 0.031 100.00 0.00 99.38 22.27 41.85 15.10230 01543700 First Fork Sinnemahoning Creek at Wharton PA 5 182.00 21.86 38.64 23.95 66.71 1457.15 0.027 0.532 98.66 0.05 95.17 22.96 42.12 15.12231 03007800 Allegheny River at Port Allegany PA 5 248.00 34.30 18.67 9.92 38.68 1022.56 0.018 1.647 100.00 0.03 87.68 23.88 42.80 14.60232 03010500 Allegheny River at Eldred PA 5 550.00 48.10 11.70 3.58 26.28 933.25 0.013 4.305 100.00 1.41 87.02 23.27 42.15 14.82233 03010734 Ischua Creek Tributary near Machias NY 5 5.12 4.39 39.49 12.75 140.06 485.52 0.081 0.100 100.00 2.55 57.43 22.55 41.96 18.96234 03010800 Olean Creek near Olean NY 5 198.00 34.52 9.41 8.95 16.29 680.38 0.014 2.631 100.00 0.86 67.78 21.87 40.63 16.46235 03011000 Great Valley Creek near Salamanca NY 5 137.00 25.32 16.37 11.10 26.24 843.18 0.019 1.394 100.00 0.47 79.96 23.63 42.59 18.45236 03011020 Allegheny River at Salamanca NY 5 1608.00 84.61 5.45 0.72 14.28 912.67 0.006 16.519 100.00 0.96 83.50 22.37 41.22 15.56237 03011800 Kinzua Creek near Guffey PA 5 46.40 16.45 36.46 29.23 48.85 510.01 0.071 0.424 100.00 0.65 95.71 23.90 43.14 14.98238 03013000 Conewango Creek at Waterboro NY 5 290.00 30.26 3.91 1.80 23.76 387.14 0.010 3.633 100.00 4.71 51.22 25.10 44.21 19.98239 03013800 Ball Creek at Stow NY 5 9.58 6.34 42.55 39.48 57.95 347.06 0.123 0.130 100.00 1.36 55.56 25.75 45.13 17.95240 03015390 Hare Creek near Corry PA 5 12.30 8.09 59.70 6.89 92.45 452.59 0.132 0.298 100.00 3.45 59.01 29.30 48.13 16.67241 03015500 Brokenstraw Creek at Youngsville PA 5 321.00 39.28 7.61 10.83 11.07 529.48 0.014 3.288 99.99 2.62 69.68 26.03 45.17 16.26242 03021350 French Creek near Wattsburg PA 5 92.00 27.84 11.08 9.19 17.93 388.34 0.029 2.005 100.00 1.86 53.90 30.66 49.79 17.16243 04213040 Raccoon Creek near West Springfield PA 5 2.53 2.93 50.96 44.91 73.78 204.52 0.249 0.050 0.00 6.24 58.32 20.59 40.63 12.77244 04213200 Mill Creek at Erie PA 5 9.16 8.27 52.71 47.48 71.36 345.65 0.152 0.140 12.04 0.00 53.31 22.94 42.70 15.59245 04213376 Canadaway Creek at Fredonia NY 5 32.90 17.79 67.62 52.33 81.50 503.62 0.134 0.268 65.70 0.21 63.10 20.51 39.44 19.77246 04213490 South Branch Cattaraugus Creek near Otto NY 5 25.10 11.39 62.60 27.05 92.90 476.71 0.131 0.222 100.00 1.29 51.69 26.79 45.72 20.40247 04213500 Cattaraugus Creek at Gowanda NY 5 436.00 56.01 17.08 15.20 21.33 519.14 0.033 2.945 94.90 1.01 57.25 24.68 43.61 19.18248 04214040 Delaware Creek near Angola NY 5 8.32 7.77 31.83 28.97 56.54 117.51 0.271 0.187 0.00 0.19 38.46 19.16 38.26 19.93249 04214200 Eighteenmile Creek at North Boston NY 5 37.20 13.92 36.12 21.09 86.14 520.49 0.069 0.317 64.87 0.24 62.20 23.92 43.07 19.78250 04214250 Smoke Creek at Lackawanna NY 5 14.30 15.25 45.48 32.53 64.64 218.38 0.208 0.325 7.18 0.58 38.49 20.13 39.41 18.01

Tables 7–10 143
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

251 04214400 Buffalo Creek near Wales Hollow NY 5 76.90 20.98 33.00 9.84 71.32 386.17 0.085 0.749 86.21 1.12 41.18 21.62 40.78 17.38252 04214410 Hunter Creek at Colegrave NY 5 14.00 9.54 40.90 22.60 77.00 410.19 0.100 0.222 85.72 0.16 56.58 23.32 42.11 17.96253 04214500 Buffalo Creek at Gardenville NY 5 142.00 43.11 17.77 14.20 31.27 345.30 0.051 1.947 59.17 0.88 42.10 21.53 40.69 17.37254 04214980 Little Buffalo Creek at East Lancaster NY 5 24.00 15.26 40.63 24.92 59.93 243.55 0.167 0.384 7.40 0.56 40.23 20.74 40.13 16.81255 04215000 Cayuga Creek near Lancaster NY 5 96.40 28.53 26.15 18.87 30.34 275.93 0.095 1.143 37.30 0.49 39.37 20.05 39.26 16.59256 04215500 Cazenovia Creek at Ebenezer NY 5 135.00 39.35 24.02 16.18 39.26 398.04 0.060 1.496 59.41 0.52 57.07 23.39 42.36 18.61257 04216400 Tonawanda Creek near Johnsonburg NY 6 23.70 9.72 79.96 86.19 57.12 397.15 0.201 0.137 100.00 1.76 53.62 21.32 40.40 16.53258 04216418 Tonawanda Creek at Attica NY 6 76.90 23.54 45.29 16.40 75.63 430.49 0.105 0.645 88.17 1.15 52.83 19.04 38.07 16.31259 04216500 Little Tonawanda Creek at Linden NY 6 22.10 11.02 70.23 15.94 97.34 498.84 0.141 0.270 86.72 0.87 56.55 17.38 36.37 15.56260 04216875 Little Tonawanda Creek Trib near Batavia NY 6 1.02 2.05 45.19 21.75 45.84 257.01 0.176 0.063 0.00 0.07 28.95 14.75 34.72 15.31261 04217000 Tonawanda Creek at Batavia NY 6 171.00 39.46 22.47 5.31 52.36 372.36 0.060 2.151 59.02 1.19 43.23 17.31 36.65 15.93262 04217500 Tonawanda Creek near Alabama NY 6 231.00 62.38 13.14 11.41 32.82 314.30 0.042 3.044 43.70 1.21 40.13 17.09 36.54 15.86263 04217700 Murder Creek at Pembroke NY 6 43.60 20.59 22.38 4.94 49.38 168.09 0.133 1.191 7.73 1.88 31.94 18.38 37.64 15.92264 04217750 Murder Creek near Akron NY 6 58.80 29.04 17.40 18.03 33.95 153.29 0.114 1.126 5.75 1.81 32.45 18.50 37.84 15.89265 04218000 Tonawanda Creek at Rapids NY 6 349.00 85.65 8.66 8.50 18.48 247.63 0.035 6.297 29.88 1.36 36.72 17.57 37.03 15.83266 04218518 Ellicott Creek below Williamsville NY 6 81.60 36.66 9.79 9.65 21.16 123.81 0.079 2.386 2.06 1.08 34.16 19.85 38.64 16.11267 04219645 Fourmile Creek near Youngstown NY 6 4.88 5.77 13.42 7.44 53.85 74.27 0.181 0.268 0.00 0.86 36.82 11.84 31.92 15.16268 04219738 Eighteenmile Creek Tributary near Lockport NY 6 2.96 4.48 69.45 26.45 78.92 169.71 0.409 0.096 0.00 0.55 11.53 14.50 34.53 15.23269 04219900 Johnson Creek near Lyndonville NY 6 95.10 26.92 15.95 8.21 20.29 78.77 0.203 1.923 0.00 1.66 22.19 12.98 32.96 15.35270 04219922 Oak Orchard Creek at Barrville Rd. near Elba NY 6 6.48 7.47 27.37 16.00 46.78 132.94 0.206 0.262 0.00 0.33 8.99 13.85 33.85 15.33271 04220150 Oak Orchard Creek at Medina NY 6 157.00 36.46 4.86 1.96 11.64 95.53 0.051 5.963 0.00 3.11 24.22 14.26 34.23 15.36272 04220250 West Creek near Hilton NY 6 31.00 17.42 20.69 11.28 33.90 86.42 0.239 0.841 0.00 0.55 29.47 9.49 29.50 14.73273 0422026250 Northrup Creek at North Greece NY 6 10.10 10.49 32.69 32.97 30.51 125.58 0.260 0.321 0.00 0.49 30.28 9.98 29.98 14.26274 04220500 Dyke Creek at Wellsville NY 5 72.10 16.43 44.45 16.05 89.47 677.08 0.066 0.419 100.00 0.12 67.72 18.04 36.50 12.37275 04221000 Genesee River at Wellsville NY 5 288.00 27.70 16.85 10.77 25.02 686.59 0.025 1.583 100.00 0.14 69.05 18.52 37.44 12.85

144 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

276 04221769 Black Creek at Hyder Flats Road at 

Black Creek NY

5 10.70 6.98 83.82 47.04 101.08 564.65 0.148 0.100 100.00 0.71 64.45 22.10 41.19 14.98

277 04222600 Wiscoy Creek at Bliss NY 5 22.00 7.38 29.14 23.23 38.91 327.03 0.089 0.237 100.00 1.79 51.29 23.94 43.04 16.19278 04223000 Genesee River at Portageville NY 5 984.00 80.18 8.65 5.97 13.17 563.58 0.015 8.066 98.81 0.57 65.63 18.88 37.78 13.69279 04224700 Sugar Creek near Ossian NY 5 10.00 6.96 77.28 55.52 98.11 538.60 0.143 0.093 100.00 0.14 72.99 13.02 31.83 11.87280 04224775 Canaseraga Creek above Dansville NY 5 88.90 22.75 34.44 56.37 28.34 680.62 0.051 0.555 93.73 0.70 69.74 14.04 33.19 11.78281 04224807 Stony Brook Tributary at South Dansville NY 5 3.15 3.32 168.75 127.46 204.90 540.45 0.312 0.020 100.00 0.20 63.31 14.04 33.61 11.64282 04224900 Mill Creek at Patchinville NY 5 4.22 3.94 157.19 137.24 235.33 679.10 0.231 0.022 100.00 0.32 66.08 14.70 33.96 11.75283 04225000 Canaseraga Creek near Dansville NY 5 152.00 25.11 32.08 56.26 23.96 637.48 0.050 0.664 91.23 0.68 62.58 13.95 33.11 11.77284 04226000 Keshequa Creek at Craig Colony at Sonyea NY 5 68.30 24.38 47.10 27.82 72.34 462.78 0.102 0.530 57.97 0.29 48.99 12.98 31.82 12.51285 04227000 Canaseraga Creek at Shakers Crossing NY 5 335.00 42.06 23.67 7.07 32.00 515.69 0.046 2.577 63.13 0.42 51.61 12.72 31.69 12.06286 04227500 Genesee River near Mount Morris NY 5 1424.00 107.73 12.49 14.85 10.50 540.94 0.023 7.982 87.65 0.39 60.39 17.06 35.99 13.31287 04229500 Honeoye Creek at Honeoye Falls NY 6 196.00 37.70 10.79 13.81 33.33 567.60 0.019 1.672 46.76 4.44 56.83 11.00 30.80 12.24288 04230380 Oatka Creek at Warsaw NY 6 39.10 11.59 57.05 64.49 49.69 344.82 0.165 0.201 93.50 0.53 41.01 18.23 37.39 15.22289 04230500 Oatka Creek at Garbutt NY 6 200.00 53.22 12.67 16.36 23.46 276.56 0.046 2.583 36.48 0.60 29.24 14.46 33.93 14.74290 04231000 Black Creek at Churchville NY 6 130.00 34.83 17.42 6.05 28.89 140.91 0.124 2.400 2.78 1.83 21.08 11.61 31.58 14.86291 04231040 Hotel Creek at Griffin Road near Churchville NY 6 4.57 6.84 11.64 10.80 15.21 118.77 0.098 0.494 0.00 0.53 16.63 10.09 30.07 14.35292 04232000 Genesee River at Rochester NY 6 2467.00 165.26 8.05 1.60 8.40 432.25 0.019 33.442 58.80 1.08 47.86 14.64 33.92 13.43293 04232034 Irondequoit Creek at Rr Mills near Fishers NY 6 39.20 14.44 22.10 18.95 35.88 336.81 0.066 0.533 0.00 1.56 35.06 10.96 30.73 13.00294 04232040 Irondequoit Creek near Pittsford NY 6 44.40 16.61 19.39 23.08 32.11 357.67 0.054 0.588 0.00 1.47 36.75 10.99 30.77 13.02295 04232046 Thomas Creek at Fairport NY 6 28.50 12.13 19.06 8.60 45.81 322.79 0.059 0.572 0.00 1.97 28.31 11.67 31.58 13.43296 04232047 Irondequoit Creek at Linden Ave 

E Rochester NY

6 101.00 22.26 15.84 12.91 23.42 325.99 0.049 1.208 0.00 1.31 29.05 11.24 31.09 13.24

297 0423204920 East Branch Allen Creek at Pittsford NY 6 6.96 7.09 37.84 61.91 33.85 257.88 0.147 0.151 0.00 0.62 19.15 10.83 30.67 13.38298 0423205010 Irondequoit Creek above Blosm Rd. near 

Rochester NY

6 142.00 25.79 17.14 17.47 23.50 292.39 0.059 1.213 0.00 1.49 25.60 11.15 31.01 13.34

299 042320527 Mill Creek Tributary near Webster NY 6 2.12 4.06 36.58 20.71 49.22 97.55 0.375 0.123 0.00 0.00 36.52 11.42 31.43 14.04300 042320578 Bear Creek at Ontario NY 6 6.74 5.23 10.34 12.99 17.73 114.99 0.090 0.323 0.00 2.78 33.40 12.96 32.97 13.96

Tables 7–10 145
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

301 04232071 Second Creek Tributary at Alton NY 6 1.07 1.54 29.79 7.82 58.19 62.69 0.475 0.067 0.00 1.68 49.62 16.99 36.99 14.55302 04232087 Red Creek Tributary No. 16 near Red Creek NY 6 2.90 3.70 20.77 14.64 45.94 176.94 0.117 0.136 0.00 3.45 51.11 19.89 39.87 16.46303 04232100 Sterling Creek at Sterling NY 6 44.40 19.49 10.60 13.81 8.72 323.04 0.033 1.624 0.00 5.98 50.76 20.08 39.94 17.06304 04232200 Catharine Creek at Montour Falls NY 5 41.10 19.73 49.33 48.99 84.78 712.50 0.069 0.301 43.97 0.96 66.07 13.79 33.04 11.27305 04232460 Sugar Creek at Guyanoga NY 6 28.90 10.06 42.20 22.29 67.87 380.12 0.111 0.251 35.21 0.30 50.03 12.05 31.93 12.02306 04232630 Kendig Creek near Macdougall NY 6 13.80 9.60 20.40 33.77 15.33 110.35 0.185 0.403 0.00 0.94 19.18 12.50 31.81 12.23307 04233000 Cayuga Inlet near Ithaca NY 5 35.20 11.74 59.45 56.94 48.16 757.46 0.078 0.220 52.66 0.87 71.58 14.86 33.98 11.75308 04233255 Cayuga Inlet at Ithaca NY 5 86.70 15.66 81.07 101.75 73.33 582.33 0.139 0.179 59.73 0.56 64.38 14.67 33.79 11.83309 04233258 Coy Glen Creek at Ithaca NY 5 3.56 4.78 222.55 317.79 108.13 402.44 0.553 0.026 53.56 0.05 55.84 14.84 33.79 12.06310 04233310 Sixmile Creek near Ithaca NY 5 42.00 14.98 63.77 53.46 67.58 645.44 0.099 0.245 70.95 0.40 75.71 16.95 35.58 12.96311 04233676 Virgil Creek at Mill Street at Dryden NY 5 20.70 11.73 42.70 42.37 75.06 544.73 0.078 0.204 95.97 0.24 54.26 23.09 41.93 15.05312 04233700 Virgil Creek at Freeville NY 5 40.30 14.99 35.90 34.29 52.95 527.80 0.068 0.344 82.19 0.82 53.33 21.47 40.30 14.74313 04234000 Fall Creek near Ithaca NY 5 126.00 33.11 16.68 14.05 26.83 403.27 0.041 1.618 72.25 1.26 53.70 20.00 38.84 14.99314 042340202 Cayuga Lake Trib No. 8 near Jacksonville NY 6 1.36 3.59 146.00 252.96 124.44 209.27 0.698 0.020 0.00 0.03 41.08 14.79 33.81 12.11315 042340588 Yawger Creek Tributary near Auburn NY 6 1.76 3.58 78.69 50.67 82.67 164.01 0.480 0.055 0.00 3.31 11.50 15.56 34.63 14.43316 04234138 Schaeffer Creek near Canandaigua NY 6 7.84 7.96 39.57 23.25 58.27 445.08 0.089 0.210 15.78 0.26 37.81 11.08 30.85 12.44317 04234200 Mud Creek at East Victor NY 6 64.20 26.93 21.80 23.19 48.73 548.00 0.040 0.776 31.15 0.37 46.34 11.12 30.91 12.42318 04234363 Marbletown Creek Tributary near Newark NY 6 0.58 1.16 36.17 80.15 9.88 509.14 0.071 0.039 0.00 1.01 40.10 14.22 34.22 13.50319 04234400 West River near Middlesex NY 6 29.30 12.78 27.03 17.80 38.22 420.46 0.064 0.471 17.21 0.29 34.04 11.48 31.39 12.17320 04235250 Flint Creek at Phelps NY 6 102.00 40.59 15.45 17.56 46.71 395.09 0.039 1.364 27.19 0.94 41.80 12.33 32.04 12.25321 04235255 Canandaigua Outlet Tributary near Alloway NY 6 2.94 3.79 20.78 13.99 26.30 376.51 0.055 0.187 0.00 0.83 24.10 14.06 33.98 13.42322 04235276 Black Brook at Tyre NY 6 19.00 15.27 5.17 9.70 2.81 80.81 0.064 2.390 0.00 4.19 35.06 13.51 32.80 13.42323 04240100 Harbor Brook at Syracuse NY 6 10.00 6.99 105.95 133.69 85.45 343.54 0.308 0.065 0.00 0.27 36.41 18.23 38.24 18.96324 04242500 East Branch Fish Creek at Taberg NY 1 188.00 42.63 35.64 47.25 21.73 313.00 0.114 1.287 75.87 10.95 79.16 37.84 56.10 28.64325 04242795 Canada Creek Tributary near Lee Center NY 1 1.34 2.90 57.64 71.68 62.84 152.61 0.378 0.043 0.00 17.66 60.99 33.08 51.30 27.36

146 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

326 04243500 Oneida Creek at Oneida NY 6 113.00 26.43 43.30 19.16 61.39 416.05 0.104 0.745 37.22 1.67 39.34 20.68 39.82 19.24327 04245000 Limestone Creek at Fayetteville NY 6 85.50 24.81 48.23 32.91 79.81 487.45 0.099 0.474 52.20 1.96 56.69 22.77 41.83 19.01328 04245200 Butternut Creek near Jamesville NY 6 32.20 13.81 48.14 30.63 124.78 589.72 0.082 0.219 71.79 1.02 61.05 21.11 40.48 18.54329 04245840 Scriba Creek near Constantia NY 1 38.40 13.92 14.38 10.06 13.06 232.65 0.062 1.116 0.00 18.47 74.71 24.89 43.78 24.20330 04249050 Catfish Creek at New Haven NY 1 31.70 21.42 3.79 3.81 4.41 197.67 0.019 4.200 0.00 17.13 63.12 23.73 43.08 23.07331 042490673 North Branch Grindstone Creek near Altmar NY 1 10.10 8.48 24.42 20.50 36.32 228.16 0.107 0.299 0.00 11.57 80.26 27.96 47.16 26.68332 04249200 North Branch Salmon River at Redfield NY 1 82.50 28.05 37.84 49.04 20.45 234.46 0.161 0.856 86.94 9.54 88.52 35.30 53.97 28.46333 04250750 Sandy Creek near Adams NY 1 137.00 28.28 24.83 23.70 21.76 312.92 0.079 1.193 29.21 3.71 53.38 27.32 45.69 24.83334 04252500 Black River near Boonville NY 1 304.00 45.05 23.93 11.44 49.36 394.46 0.061 1.800 90.35 16.03 79.70 32.05 48.81 27.85335 04254500 Moose River at Mckeever NY 1 363.00 41.40 23.45 15.10 45.43 696.14 0.034 1.514 100.00 18.77 80.59 31.26 47.81 26.82336 04256000 Independence River at Donnattsburg NY 1 88.70 30.90 33.83 35.26 31.47 438.17 0.077 0.901 98.12 22.49 76.66 28.64 45.72 27.96337 04256040 Tributary to Mill Creek Tributary near 

Lowville NY

1 1.66 3.35 192.32 260.00 106.74 341.51 0.563 0.020 100.00 0.52 33.11 27.57 45.01 28.01

338 04256485 Woods Lake Outlet near Big Moose NY 1 0.80 1.39 74.36 0.00 343.55 791.97 0.094 0.075 100.00 17.01 82.58 29.98 46.07 26.80339 04258700 Deer River at Deer River NY 1 94.80 29.43 40.99 44.20 37.56 227.70 0.180 0.705 91.59 6.77 69.55 33.91 51.41 26.67340 04260500 Black River at Watertown NY 1 1864.00 128.05 12.83 4.81 26.19 423.21 0.030 10.191 77.06 14.26 71.01 28.99 46.08 27.02341 04260575 Horse Creek Tributary near Dexter NY 1 4.59 4.36 15.34 4.90 43.71 69.23 0.222 0.268 0.00 1.02 36.68 17.47 36.24 21.49342 04262500 West Br Oswegatchie River near Harrisville NY 1 258.00 46.02 31.58 28.10 30.32 413.23 0.076 1.524 55.38 16.91 81.50 27.30 43.91 21.96343 04263000 Oswegatchie River near Heuvelton NY 1 986.00 127.52 12.79 2.29 20.30 423.33 0.030 15.229 41.51 13.13 73.80 23.46 40.88 20.84344 04263445 Birch Creek at Pierces Corners NY 1 1.67 4.15 30.68 27.63 38.81 380.36 0.081 0.123 0.00 0.83 81.85 16.95 35.81 18.65345 04264300 Brandy Brook near Waddington NY 1 22.80 16.09 4.57 5.93 4.46 100.54 0.045 2.617 0.00 28.92 35.17 13.99 32.77 18.68346 04264400 Middle Branch Grass River near Clare NY 1 63.00 22.49 32.24 39.96 32.95 399.08 0.081 0.603 74.39 2.27 96.68 24.69 41.59 20.72347 04264700 North Branch Grass River near Clare NY 1 46.30 24.07 26.95 26.50 40.39 447.33 0.060 0.713 64.12 7.42 91.80 24.25 41.37 20.26348 04265000 Grass River at Pyrites NY 1 333.00 63.02 21.06 20.40 16.90 446.30 0.047 3.220 63.39 5.29 92.34 24.34 41.24 21.09349 04265100 Elm Creek near Hermon NY 1 32.60 12.51 23.69 4.43 54.10 514.02 0.046 0.723 0.00 5.73 77.64 20.64 38.91 18.90350 04265200 Tanner Creek at Stellaville NY 1 33.40 17.87 20.91 18.23 29.10 407.24 0.051 0.743 0.00 6.37 80.33 19.17 37.93 18.66

Tables 7–10 147
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

351 04265300 Little River near Canton NY 1 42.40 16.94 37.93 41.80 39.71 347.38 0.109 0.406 0.01 3.79 81.34 20.16 38.12 19.00352 04267600 Cold Brook near South Colton NY 1 18.70 9.67 40.69 56.64 35.34 478.03 0.085 0.211 91.00 5.08 91.00 24.72 42.01 20.51353 04267700 Parkhurst Brook near Potsdam NY 1 16.80 13.52 50.82 33.44 62.67 313.12 0.162 0.289 2.35 3.49 85.07 20.67 38.29 19.24354 04267800 Trout Brook at Allen Corners NY 1 54.20 24.60 10.57 7.15 15.38 176.28 0.060 2.129 0.00 9.80 61.89 15.63 34.04 18.77355 04268200 Plum Brook near Grantville NY 1 43.90 22.25 11.82 12.78 10.68 149.01 0.079 1.754 0.00 22.69 58.37 14.97 33.28 18.91356 04268700 St. Regis River at St. Regis Falls NY 1 234.00 41.46 13.19 10.61 13.51 464.67 0.028 3.195 100.00 14.14 84.25 25.61 42.22 24.28357 04268720 Hopkinton Brook at Hopkinton NY 1 20.00 9.21 53.84 38.89 82.77 256.02 0.210 0.159 50.48 5.50 93.03 24.07 40.86 20.13358 04268800 West Branch St. Regis River near Parishville NY 1 171.00 40.69 15.35 26.09 7.67 482.86 0.032 2.655 97.53 7.64 91.03 26.30 43.03 23.32359 04269000 St. Regis River at Brasher Center NY 1 612.00 75.27 22.29 22.86 14.85 412.07 0.054 3.871 73.80 9.41 85.78 24.20 41.08 22.47360 04269050 Allen Brook near Brasher Falls NY 1 16.00 12.98 54.50 29.20 74.27 142.48 0.383 0.272 0.00 5.82 68.01 17.71 34.74 19.68361 04269100 Lawrence Brook near Moira NY 1 25.70 13.36 52.07 19.16 93.59 270.15 0.193 0.306 1.20 1.92 67.05 17.36 34.48 20.57362 04269500 Deer River at Brasher Iron Works NY 1 191.00 52.06 31.14 31.09 14.02 251.07 0.124 2.371 31.41 10.09 75.11 19.62 36.79 21.11363 04270000 Salmon River at Chasm Falls NY 1 132.00 21.40 18.07 25.53 35.97 651.01 0.028 0.683 99.78 5.76 93.34 23.33 40.27 24.41364 04270100 West Branch Deer Creek at Fort Covington 

Center NY

1 32.40 16.07 32.70 11.68 81.33 126.75 0.258 0.497 0.00 4.84 58.61 14.84 33.02 21.39

365 04270150 East Branch Deer Creek at 

Fort Covington Center NY

1 23.90 17.39 57.13 21.59 90.15 140.10 0.408 0.383 0.69 4.64 54.64 16.42 34.31 22.35

366 04270162 East Branch Little Salmon River near Skerry NY 1 7.11 6.18 131.24 117.22 162.33 398.94 0.329 0.044 74.86 6.56 88.60 22.19 39.20 23.76367 04270200 Little Salmon River at Bombay NY 1 92.20 35.51 45.37 12.82 66.00 261.70 0.173 1.167 23.25 4.35 70.45 18.16 35.63 21.92368 04270700 Trout River at Trout River NY 1 107.00 27.72 63.76 42.66 83.00 311.93 0.204 0.458 45.69 2.21 73.41 19.48 36.86 23.68369 04270800 English River near Mooers Forks NY 1 40.80 21.13 41.81 46.38 40.80 152.75 0.274 0.475 8.41 23.76 58.28 15.33 33.15 20.52370 04271815 Little Chazy River near Chazy NY 1 50.30 22.52 43.68 13.04 78.89 229.37 0.190 0.672 7.68 7.82 66.69 14.16 32.40 16.45371 04273500 Saranac River at Plattsburgh NY 1 608.00 89.09 17.75 33.71 3.94 556.37 0.032 6.804 88.62 8.87 85.48 18.70 35.60 22.78372 04273700 Salmon River at South Plattsburgh NY 1 63.30 21.93 54.07 48.88 76.11 468.30 0.115 0.354 31.39 3.61 82.07 12.29 30.37 17.50373 04273800 Little Ausable River near Valcour NY 1 67.80 21.63 41.49 13.19 101.01 445.51 0.093 0.568 12.70 1.48 78.47 11.35 29.49 17.03374 04274000 West Branch Ausable River near Lake Placid NY 1 116.00 20.30 78.77 16.97 237.49 1090.98 0.072 0.310 100.00 5.37 90.65 25.21 41.41 23.40375 04275000 East Branch Ausable River at Au Sable Forks NY 1 198.00 41.68 44.53 17.25 115.03 1394.65 0.032 0.906 77.00 1.32 95.35 21.78 38.72 21.21

148 Magnitude and Frequency of Floods in New York
Table 10.  Data on selected basin characteristics of rural, unregulated streams in New York, excluding Long Island.—Continued

[ Basin characteristics are explained in table 1. Station locations and hydrologic region boundaries are shown in figure 2]

Map 

number

Station number Station name

Hydrologic 

region

Basin characteristics (definitions are given in footnote)

A L SL SL_LO SL_UP BS SR LAG EL12 ST FOR RUNF P MXSNO

376 04275500 Ausable River near Au Sable Forks NY 1 446.00 44.04 43.39 15.74 106.13 1167.00 0.037 1.040 80.19 3.02 93.54 20.75 37.65 21.46377 04276200 Bouquet River at New Russia NY 1 37.60 15.65 152.21 76.49 258.67 1561.72 0.097 0.110 82.15 0.16 98.91 22.67 39.96 21.32378 04276500 Bouquet River at Willsboro NY 1 270.00 47.17 34.21 10.63 100.10 1000.13 0.034 1.375 42.07 1.10 90.19 15.77 34.22 19.46379 04276770 Mill Brook at Port Henry NY 1 27.00 12.13 91.15 103.81 110.45 856.07 0.106 0.112 63.29 1.75 92.40 15.67 34.47 20.50380 04276842 Putnam Creek East of Crown Point Center NY 1 51.60 18.42 79.95 81.35 112.84 747.29 0.107 0.190 49.35 3.03 94.54 16.70 35.68 20.77381 04278300 Northwest Bay Brook near Bolton Landing NY 1 22.00 7.53 167.88 71.80 267.39 1201.22 0.140 0.054 54.00 1.70 98.29 19.11 37.73 20.57382 04279400 Poultney River Tributary at East Poultney VT 1 1.13 2.10 164.92 88.63 429.46 858.29 0.192 0.011 0.00 3.99 57.31 16.85 36.06 19.64383 04280200 Mettawee River Tributary 2 at East Ruppert VT 1 1.86 2.40 662.27 408.66 1093.58 1306.27 0.507 0.004 86.50 0.86 95.21 23.27 42.09 22.51384 04280300 Mettawee River Tributary near Pawlet VT 1 2.09 3.55 357.33 127.64 705.20 1175.41 0.304 0.012 47.30 0.83 73.60 17.50 36.57 21.57385 04280350 Mettawee River near Pawlet VT 1 70.20 19.02 55.02 23.18 149.53 1226.34 0.045 0.315 59.01 1.15 73.48 21.34 40.31 21.98386 04280450 Mettawee River near Middle Granville NY 1 167.00 29.59 35.74 23.26 77.59 986.63 0.036 0.678 34.20 2.92 67.12 18.96 38.14 20.93387 04292500 Lamoille River at East Georgia VT 1 686.00 66.23 14.75 8.06 27.67 785.38 0.019 4.109 48.70 4.21 77.63 26.02 43.25 19.64388 04292700 Stone Bridge Brook near Georgia Plains VT 1 8.45 7.91 34.84 34.47 60.68 478.15 0.073 0.169 0.00 5.65 54.39 12.72 32.89 14.90

Minimum 0.41 1.06 2.76 0.00 2.81 62.69 0.004 0.002 0.00 0.00 8.99 9.49 29.49 9.74Maximum 4773.00 189.96 729.47 591.95 1135.57 1720.11 0.772 48.309 100.00 28.92 100.00 40.73 59.99 28.64Mean 246.47 27.43 60.14 45.27 91.18 632.36 0.109 2.058 58.93 3.14 69.13 21.82 40.94 16.84Median 57.90 18.24 36.06 23.21 52.65 599.41 0.069 0.474 76.86 1.49 70.58 21.65 40.80 16.38Standard deviation 612.68 30.59 83.04 66.86 129.79 322.80 0.118 5.041 40.94 4.22 20.33 6.18 5.99 4.0125th Percentile 13.05 8.12 17.55 10.61 27.04 406.25 0.032 0.128 7.71 0.46 56.59 17.28 36.47 14.0275th Percentile 181.25 34.35 69.51 50.30 100.81 819.66 0.140 1.783 99.01 4.23 85.68 25.44 43.94 19.30

A Drainage area (A), in square miles.L Main-channel stream length, in miles.SL Main channel slope, in feet per mile.SL_LO Lower half main channel slope, in feet per mile.SL_UP Upper half main channel slope, in feet per mile.

BS Average basin slope, in feet per mile.

SR Slope ratio .LAG Basin lag factor.EL12 Percentage of basin above 1,200 feet.ST Basin storage, in percent.

FOR Basin forested area, in percent.RUNF Mean annual runoff, in inches.P Mean annual precipitation, in inches.MXSNO Seasonal maximum snow depth, in inches.

Tables 7–10 149
Appendix 1. New York Flood-Frequency Tool

\ny_flood_freq - top level directory name

\aml - location of AML program files, batch files, 

shortcuts, help and readme files

\comp_ny - location of the Excel spreadsheets for 

computing discharges in each of the 

hydrologic regions

\input - location for user-supplied basin outlines and 

of auto-delineated basin outlines created by 

the New York Flood-Frequency Tool

\ned - location of the National Elevation Dataset 

(NED) 1 Arc Second raster product and 

elevation derivatives

\output - location of the output text summary files, 

ArcPlot GRA maps, and enhanced metafile 

(EMF) map files

\prereq - location of prerequisite projection files, 

supporting datasets, and the AFPL 

Ghostscript utility

\process - temporary processing folder, should be 

empty when not in run time

\raster - location of raster datasets needed for 

generating basin characteristics.

The datasets included on the DVD were used to develop 

the equations and should be used when generating basin 

characteristics for the regional regression equations. To use 

different or updated versions of these datasets may result 

in computed discharges of undeterminable accuracy. More 

detailed information about the spatial datasets included on the 

DVD can be found on p. 12 under “Basin Characteristics”.

Installation of the New York 

Flood-Frequency Tool

Once the required ESRI software is installed and the 

programs, datasets, and other supporting files are loaded in 

the appropriate directory structure, the New York FloodFrequency Tool is ready for use. Proper installation requires 

the following steps:

Copy the entire ny_flood_freq folder from the DVD to a 

location on a local drive (for example, C:\ny_flood_freq).

In the \ny_flood_freq\amls folder, right click on the 

“NY Flood-Frequency Tool” shortcut, and select 

Properties. Under the Shortcut tab, edit the path to the 

“Start In” to reflect the location of the amls folder in 

your local installation and edit the “Target” to reflect the 

location of the menu.bat file in your amls folder in your 

local installation.

1.

2.

150 Magnitude and Frequency of Floods in New York

A DVD is included with this report (in the pocket at the 

back of the report) that contains a customized geographic 

information system (GIS) tool that automates the measurement 

of basin characteristics and calculation of corresponding 

flow statistics. The application, called the New York FloodFrequency Tool, allows the user to select a point of interest 

on a synthetic stream network derived from a digital elevation 

model (DEM). The tool automatically computes the required 

basin characteristics and solves the regional regression 

equations based on the location of the site of interest. The 

tool produces a map for the user to review the results of the 

automated measurement of basin characteristics and a text file 

containing the calculated basin parameters and flow statistics.

The DVD also contains a spreadsheet for computing peak 

discharges for a gaged site, an ungaged site, or an ungaged 

site on a gaged stream within any of the six flood-frequency 

hydrologic regions developed for this report (a separate 

worksheet is included for each region).

The New York Flood Frequency Tool was developed with 

the Environmental Systems Research Institute, Inc. (ESRI) 

Arc/INFO Workstation version 9.1 software using the ESRI 

Arc Macro Language (AML) for the programming language.

Updates and additional information about the New York 

Flood-Frequency Tool can be downloaded from the USGS 

New York Water Science Center website at http://ny.water.

usgs.gov/projects/floodfreq.

System Requirements

The New York Flood-Frequency Tool requires the 

following software:

ESRI ArcGIS Desktop 9.0 or higher with the Spatial 

Analyst extension;

ESRI Arc/INFO Workstation, version 9.0 or higher with 

the Grid module;

The New York Flood-Frequency Tool successfully 

runs on Microsoft Windows XP. Other operating systems 

have not been tested. Required disk space for computing 

basin characteristics throughout New York is estimated to be 

3.3 gigabytes.

Data Requirements

 The New York Flood-Frequency Tool functions properly 

by copying the entire suite of programs and supporting 

datasets using the naming convention provided on the 

DVD. The following is a summary of the directory structure 

and contents:

1.

2.
(for example Target: C:\ny_flood_freq\amls\menu.bat)

(for example Start in: C:\ny_flood_freq\amls).

This step is dependent on your ESRI ArcGIS installation 

location. If the path to your ArcGIS installation is 

different than C:\ArcGIS\, the menu.bat file in the amls 

folder must be edited to reflect the correct path of your 

ArcGIS installation.

Using the New York Flood-Frequency Tool

The New York Flood-Frequency Tool is invoked 

by using the “NY Flood Frequency Tool” shortcut in the 

\ny_flood_freq\amls folder. This shortcut can be copied and 

placed on the user’s desktop. The tool consists of four steps 

or programs to assist users to derive the necessary basin 

characteristics for solving the flood-frequency regression 

equations in this report. A brief summary of each step is 

provided below:

Step one allows the user to select a single grid cell on 

the digital stream network called a pourpoint (based 

initially on a user provided latitude and longitude) for the 

site of interest. The user has the option to either input a 

pre-determined basin outline (recommended) or to autodelineate a basin outline using the DEM flow-direction 

derivative dataset.

Step two uses the basin outline provided by the user or 

delineated in step one to calculate non-DEM-generated 

basin characteristics required to solve the floodfrequency equations.

 Step three uses the pourpoint grid cell and the basin 

outline from step one to calculate DEM-generated basin 

and main-channel characteristics required to solve the 

flood-frequency equations.

Step four computes the flood-frequency discharges for 

selected recurrence intervals based on the information 

from steps one through three.

The flowchart on page 152 shows the steps involved 

to use the New York Flood-Frequency Tool. There is 

online information to guide the user through the programs 

and each step has a help file. The tool is designed to be 

used sequentially from step one through step four without 

interruption. For the site of interest, the tool uses a Process ID 

and associated basin outline to maintain continuity between 

steps. Using the steps out of order could result in incorrect 

values. If any step does not successfully complete, it is 

recommended that the user start over from step one. It is the 

user’s responsibility to verify the accuracy of datasets used 

as inputs and any basin-characteristic outputs created by the 

New York Flood-Frequency Tool before use in the regional 

regression equations.

3.

1.

2.

3.

4.

Limitations

The New York Flood-Frequency Tool is provided to assist 

users with solving the regional regression equations. However, 

there will be instances, especially in low relief areas, where 

the tool will fail to properly model the watershed. For these 

cases, the user may need to use an alternate method to derive 

the basin characteristics from the provided datasets.

Step one provides the option of delineating a basin 

outline for the site of interest using the DEM derivative 

datasets. It is the user’s responsibility to verify the accuracy of 

any basin outline generated using this program.

Step two computes non-DEM generated basin 

characteristics (for example, land-use and climate parameters) 

using the basin outline from step one. If the computed values 

are outside the limits of the data used for the study sites, the 

accuracy of the computed discharges may be unknown (this 

reasoning applies to all computed basin characteristics).

The contour interval used in step three should be set to 

match the contour interval displayed on the 1:24,000-scale 

digital raster graphics for the point of interest. For an outlet of 

a large watershed, a larger contour interval might be required 

to calculate the basin characteristics.

In some cases, the tool may fail to properly model the 

watershed for a site of interest. Manual derivation of basin 

characteristics using the spatial datasets provided on the DVD 

may be possible. A spreadsheet is available on the DVD to 

compute flood discharges.

Questions regarding the use of the New York 

Flood-Frequency Tool can be sent to the AskNY@usgs.gov 

email address.

Using the New York Flood-Frequency 

Spreadsheet

 An Excel spreadsheet (workbook) is available on the 

DVD for manual computation of flood discharges at a gaged 

site, an ungaged site, or an ungaged site on a gaged stream. 

The spreadsheet is located in the comp_ny folder and is 

called ny_flood_freqv1.0.xls. Only cells shown with a yellow 

background need to be edited with the correct information. 

All variables being computed are defined in the report in the 

section “Computation of Peak Discharge.” Comments are 

included with several cells in the worksheet to assist the user. 

A worksheet is provided for each of the six hydrologic regions 

and example data are included with each worksheet. Copies 

of the worksheets can be made for use with specific sites 

of interest.

Future Updates

 Updates and additional information about the New York 

Flood-Frequency Tool can be downloaded from the USGS 

New York Water Science Center website at http://ny.water.

usgs.gov/projects/floodfreq.

Appendix 1 151
USER INPUT

Latitude, longitude, and

basin outline for the

site of Interest

STEP 1 

Select pourpoint grid cell

and optional basin outline

auto delineation

STEP 2 

Compute non-DEM

(climate and land cover)

basin characteristics

STEP 3 

Compute

DEM-generated basin

and main-channel

characteristics

USER OUTPUT

Map

display

STEP 4

Calculate

flood-frequency

discharges

USER OUTPUT

Summary

text file

152 Magnitude and Frequency of Floods in New York
For additional information write to: 

New York Water Science Center

U.S. Geological Survey

425 Jordan Road 

Troy, NY 12180

Information requests:

(518) 285-5602

or visit our Web site at:

http://ny.water.usgs.gov
Lumia, Freehafer and Smith—Magnitude and Frequency of Floods in New York—Scientific Investigations Report 2006−5112