Flow Durations, Low-Flow Frequencies, 

and Monthly Median Flows for Selected 

Streams in Connecticut through 2005

By Elizabeth A. Ahearn

Prepared in cooperation with the

Connecticut Department of Environmental Protection and

New England Water Pollution Control Commission

Scientific Investigations Report 2007–5270

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: 2008

For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, 

natural hazards, and the environment:

World Wide Web: http://www.usgs.gov

Telephone: 1-888-ASK-USGS

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the 

U.S. Government.

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:

Ahearn, E.A., 2008, Flow durations, low-flow frequencies, and monthly median flows for selected streams in 

Connecticut through 2005: U.S. Geological Survey Scientific Investigations Report 2007–5270, 33 p. ONLINE ONLY
iii

Contents

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

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

Streamflow Statistics at Stations with Continuous Record of 10 Years or More ...............................2

Flow Durations.......................................................................................................................................2

Low-Flow Frequencies.........................................................................................................................4

Monthly Median Streamflows ............................................................................................................4

Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites.........................5

Summary..........................................................................................................................................................8

Acknowledgments.........................................................................................................................................8

Selected References.....................................................................................................................................8

Figures

1–2. Maps showing—

1. Locations of all streamgaging stations and partial-record sites used to 

estimate flow durations, low-flow frequencies, and monthly median flows for 

selected streams in Connecticut through 2005 ..............................................................3

2. Locations of index stations, short-term stations, and partial-record sites 

used for correlation of base flows....................................................................................6

3. Graph showing an example of the MOVE.3 relation between a partial-record 

station, Haleys Brook (0118750), and an index station, Pendleton Brook (01118300)........7

Tables

1. Descriptions of streamgaging stations with 10 or more years of continuous 

record in Connecticut used to compute flow durations, low-flow frequencies, 

and monthly median flow statistics .........................................................................................12

2. Flow-duration statistics for 91 streamgaging stations with 10 or more years of 

continuous record in Connecticut ...........................................................................................15

3. Low-flow frequency statistics for 91 streamgaging stations with 10 or more years 

of record in Connecticut............................................................................................................18

4. Monthly median streamflows for 91 stations with 10 or more years of record in 

Connecticut..................................................................................................................................21

5. Descriptions of short-term stations in Connecticut used in correlation of daily 

mean base flows to estimate low-flow statistics..................................................................24

6. Descriptions of partial-record sites in Connecticut used in correlation of daily 

mean base flows to estimate flow duration, low-flow frequency, and August 

median statistics.........................................................................................................................25

7. Basin characteristics for the index stations, short-term stations, and partialrecord sites..................................................................................................................................26

8. Summary of low-flow correlation coefficients at short-term stations and partialrecord sites in Connecticut.......................................................................................................29

9. Low-flow statistics derived using the MOVE.3 method for short-term streamgaging 

stations and partial-record sites in Connecticut...................................................................32
iv

Conversion Factors and Datum

[Inch/Pound to SI]

Multiply By To obtain

Length

foot (ft) 0.3048 meter (m)

Area

square mile (mi2) 2.590 square kilometer (km2) 

Flow rate

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

cubic foot per second per square mile 

[(ft3/s)/mi2]

0.01093 cubic meter per second per square 

kilometer [(m3/s)/km2]

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

Flow durations, low-flow frequencies, and monthly 

median streamflows were computed for 91 continuous-record, 

streamflow-gaging stations in Connecticut with 10 or more 

years of record. Flow durations include the 99-, 98-, 97-, 95-, 

90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, 

and 1-percent exceedances. Low-flow frequencies include the 

7-day, 10-year (7Q10) low flow; 7-day, 2-year (7Q2) low flow; 

and 30-day, 2-year (30Q2) low flow. Streamflow estimates 

were computed for each station using data for the period of 

record through water year 2005.

Estimates of low-flow statistics for 7 short-term (operated 

between 3 and 10 years) streamflow-gaging stations and 31 

partial-record sites were computed. Low-flow estimates were 

made on the basis of the relation between base flows at a 

short-term station or partial-record site and concurrent daily 

mean streamflows at a nearby index station. The relation is 

defined by the Maintenance of Variance Extension, type 3 

(MOVE.3) method. Several short-term stations and partialrecord sites had poorly defined relations with nearby index 

stations; therefore, no low-flow statistics were derived for 

these sites. The estimated low-flow statistics for the shortterm stations and partial-record sites include the 99-, 98-, 97-, 

95-, 90-, and 85-percent flow durations; the 7-day, 10-year 

(7Q10) low flow; 7-day, 2-year (7Q2) low flow; and 30-day, 

2-year (30Q2) low-flow frequencies; and the August median 

flow. Descriptive information on location and record length, 

measured basin characteristics, index stations correlated to 

the short-term station and partial-record sites, and estimated 

flow statistics are provided in this report for each station. 

Streamflow estimates from this study are stored on USGS’s 

World Wide Web application “StreamStats” (http://water.usgs.

gov/osw/streamstats/connecticut.html).

Introduction

Management of water resources is undergoing significant 

changes and broad restructuring as biologists, ecologists, and 

hydrologists further the scientific understanding of natural 

river flows and flow conditions necessary to sustain aquatic 

life. As water withdrawals increase, more rivers have become 

environmentally stressed. Over recent years, the state government of Connecticut has worked towards integrating water 

allocation and uses with protecting the ecological integrity 

of the riverine ecosystems. Policymakers and planners are 

considering the needs of freshwater environments and have 

been establishing in-stream flow requirements to safeguard the 

rivers. In-stream flows are streamflows of a particular magnitude, frequency, and timing that are necessary to ensure that a 

river system remains environmentally healthy. To achieve the 

highest possible level of stream health for the designated class 

of stream use, the first challenge to is to analyze water availability for the environment and for direct withdrawal and use. 

Streamflow statistics are an important tool used to assess water 

availability. Determination of timely, relevant streamflow 

statistics—flow durations, low-flow frequencies, and monthly 

median streamflows—will provide information useful to state 

government and local officials in making water-resource, 

regulatory, and other management decisions. 

Flow durations and monthly median streamflows for 

Connecticut streams were last computed by the U.S. Geological Survey (USGS) more than 20 years ago (Randall and 

others, 1966; Thomas, M.P., and others, 1967; Thomas, C.E., 

and others, 1968; Ryder and others, 1970, 1981; Cervione and 

others, 1972; Wilson and others, 1974; Mazzaferro and others, 1979; Weiss and others, 1982; and Handman and others, 

1986). Low-flow frequencies for Connecticut streams were 

last computed in the early 1980s (Cervione, 1982; Weiss, 

1983). Since these studies, an additional 20 years of streamflow data have been collected and new methods have been 

developed for estimating low-flow statistics at short-term 

stations and partial-record sites. To update the streamflow 

statistics, the USGS in cooperation with the Connecticut 

Department of Environmental Protection (DEP) and the New 

England Interstate Water Pollution Control Commission 

(NEIWPCC) conducted this study to compute flow durations, 

low-flow frequencies, and monthly median streamflows for 

Connecticut streams using data through water year1 2005. 

1

 A water year is defined as the 12-month period October 1 through September 30. The water year is designated by the calendar year in which it ends and 

which includes 9 of the 12 months. Thus, the year ending September 30, 2005 

is termed the 2005 water year.

Flow Durations, Low-Flow Frequencies, and 

Monthly Median Flows for Selected Streams in 

Connecticut through 2005

By Elizabeth A. Ahearn
2 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Locations of streamgaging stations and partial-record sites 

used in this study are shown on figure 1 . 

This report provides streamflow estimates for 91 continuous-record streamflow-gaging stations with 10 or more 

years of record (hereinafter referred to as “streamgaging 

stations”), including (1) 99-, 98-, 97-, 95-, 90-, 85-, 80-, 75-, 

70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, and 1-percent flow 

durations; (2) 7-day, 10- and 2-year low flow and 30-day, 

2-year low-flow frequencies; and (3) monthly median streamflows. In addition, this report provides low-flow estimates for 

7 short-term stations with less than 10 years of record and 

31 partial-record sites, including (1) 99-, 98-, 97-, 95-, 90-, 

and 85-percent flow durations; (2) 7-day, 10- and 2-year low 

flow and 30-day, 2-year low-flow frequencies; and (3) August 

median streamflows (fig. 1). Methods used to estimate the 

flow statistics at streamgaging stations and partial-record sites 

are described. The analyses are based on published streamflow data collected through water year 2005. Estimates of 

flow durations, low-flow frequencies, and monthly median 

streamflows are stored on USGS’s World Wide Web application “StreamStats” (http://water.usgs.gov/osw/streamstats/

connecticut.html) (Ahearn, in press). 

Streamflow Statistics at Stations with 

Continuous Record of 10 Years or More 

Streamflow data for 91 streamgaging stations with 10 

or more years of daily mean record (fig. 1; table 1 in back 

of report) were retrieved from the USGS’s National Water 

Inventory System (NWIS) (http://waterdata.usgs.gov/ct/nwis/

nwis, accessed on September 12, 2006). At 70 percent of 

the stations (64 of 91), streamflow is considered artificially 

increased or decreased by water withdrawals, out-of-basin 

transfers, point-source discharges, regulation, and (or) 

reservoir operations; at 30 percent of the stations (27 of 91), 

streamflow is considered natural with negligible anthropogenic 

effects to the hydrologic flow regime. Throughout this 

report, stations with natural flow conditions are referred to as 

“index stations or index basins.” Index stations can be used 

to evaluate water resources and characterize regional trends 

in streamflow. In addition, index stations often are used to 

characterize streamflow on rivers where there is little or no 

data. Currently (2007), USGS operates eight index stations in 

Connecticut; the other 19 have been discontinued. 

Flow Durations

Flow durations represent the percentage of time that 

a given flow is equaled or exceeded without regard to the 

sequence of recorded flows. Typically, flow durations characterize the range of flow rates for the period over which 

data were collected. Flow durations can be computed using 

commercially available statistical software. S-Plus (Insightful, 

2006) was used for this study to compute the 99-, 98-, 97-, 

95-, 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 20-, 10-, 5-, 

and 1-percent exceedances. Flow durations were computed 

for the 91 stations for the period of record through water year 

2005 (table 2 in back of report). 

Flow durations are computed by sorting the daily mean 

streamflows for the period of record from the largest value 

to the smallest value and assigning each streamflow value a 

rank, starting with 1 for the largest value. The frequencies of 

exceedance are then computed using the Weibull formula for 

computing plotting position (Helsel and Hirsch, 1992): 

P = 100 * [M / (n + 1)], (1)

where

P = the probability that a given flow will be 

equaled or exceeded (percent of time), 

M = the ranked position (dimensionless), 

and

n = the number of events for period of record 

(dimensionless).

To compare flow durations in different basins, streamflows are “normalized” to a streamflow per unit area. Therefore, the flow duration at each of the 91 streamgaging stations 

was divided by its respective drainage area. Normalized 

streamflows ranged from 0.01 to 0.42 cubic feet per second 

per square mile (ft3/s/mi2) at the 99-percent flow duration with 

three statistical outliers (Guinea Brook and Safford Brook, 

0.0 ft3/s/mi2; Clear Brook, 0.90 ft3/s/mi2). Normalized streamflows ranged from 0.02 to 0.54 ft3

/s/mi2 at the 95-percent 

flow duration with one statistical outlier (Clear Brook, 

1.19 ft3/s/mi2). The drainage basins of Guinea Brook and Safford Brook are predominately covered by glacial till (greater 

than 98 percent) and have little or no ground-water discharge 

during dry weather. Clear Brook’s substantially greater 

normalized low flows compared to the other stations are high 

because the ground-water drainage area is larger than the 

surface-water drainage area. In addition, the drainage area of 

Clear Brook has a large percentage of glacial stratified deposits (44.6 percent) (table 7), and the ground-water discharge can 

have a pronounced effect on streamflow. Another basin, South 

Branch Salmon Brook, exhibits similar low-flow characteristics as Clear Brook. South Branch Salmon Brook (01192600) 

also has greater normalized low flows because the groundwater drainage area is larger than the surface-water drainage 

area. In addition, the drainage area of South Branch Salmon 

Brook has a large percentage of glacial stratified deposits 

(about 65 percent) (table 7). Both Clear Brook and South 

Branch Salmon Brook have small surface-water drainage areas 

(less than 1 mi2) and are geographically close to each other. 

Median normalized streamflows (50-percent flow duration) 

ranged from 0.5 to 1.6 ft3/s/mi2 for 90 stations with one outlier 

(Clear Brook, 2.5 ft3/s/mi2). Normalized streamflows ranged 

from 3.7 to 7.3 ft3/s/mi2 and 6.2 to 18.4 ft3/s/mi2 at the 5- and 

1-percent flow durations, respectively. 
Streamflow Statistics at Stations with Continuous Record of 10 Years or More 3 Figure 1. Locations of all streamgaging stations and partial-record sites used to estimate flow durations, low-flow frequencies, and monthly median flows for selected streams in Connecticut through 2005. Reference numbers shown above are used to describe the stations in tables 1–9.

Housatonic River

81

57 114

146

9

8 7

6

5

4 3

2

1

99

98

97

96

95

94

93

92

91 90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

75

74

73 72 71

70

69

67

68

66 65

64

63

61

62

60

59

58 57

56

55

54 53

52

51 50

49

48

47 46

45

44 43

42

41

40

39

38 37

36

35

34

33

32

31

30

29

28

27

26

25

24 23

22

21

20

19

18

17

16

15

14

13

12

11

10

148 147

146

145

144

142

143 141

140

139

138

137 136

135

134

133 132

131

130

129

128

127

126

125 124

123

122

121

119

120

118

117

116

115

114 113 112

111

110

109

108

107

106

105

104

103

102 101

100

72° 73°

42°41°

Massachusetts

New York Rhode Island

0 10 20 MILES

0 10 20 KILOMETERS

Long Island Sound

New York

Connecticut

EXPLANATION

Index station and identifierGaging station and identifierPartial-record site and identifierShort-term streamgaging station and identifier

16

11

974

Base from U.S. Geological Survey digital data,1:24,000, 1969–84, Connecticut State Plane projection

Quinnipiac River

Connecticut River

Thames River

ni mraF t g no i R ev r
4 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Overall, the index basins tend to have slightly smaller 

normalized low flows than the basins where the hydrologic 

flow regime has been altered, with a few exceptions: basins 

where the ground-water drainage area is larger than the 

surface-water drainage area, and (or) those with a large 

percentage of glacial stratified deposits. Normalized flows 

at the 99-percent flow duration for 25 of the 27 index 

basins were less than 0.16 ft3/s/mi2, with a median of 

0.03 ft3/s/mi2. The sizes of the index basins range from 2.45 

to 100 mi2. For similar-size basins with altered flow, the 

normalized 99-percent flow durations ranged from 0.01 to 

0.42 ft3/s/mi2, with a median of 0.10 ft3/s/mi2. Basins such 

as those of the Naugatuck, Quinnipiac, Still, and Housatonic 

Rivers have numerous point discharges and their streams 

exhibit some of the highest normalized flows at the 99-percent 

flow duration in the state (0.17 to 0.31 ft3/s/mi2). When 

comparing low flows from index stations and stations on 

waste-receiving streams, it is expected that waste-receiving 

streams will exhibit higher low flows than might occur 

naturally because point-source discharges increase the natural 

flows of a river. Reduced river flows are attributed to water 

withdrawals, diversions, increased development, and (or) 

dams. Streamflows can be increased or decreased depending 

upon the way the watershed is managed and water is allocated. 

To have a clearer explanation of the differences in the 

hydrologic characteristics of basins with natural and altered 

flow conditions, an assessment of the different hydrologic 

flow regimes among rivers and extent of hydrologic alteration 

is needed. 

Low-Flow Frequencies

Low-flow frequencies typically are computed for stations 

by use of annual series of selected low flows based on the 

lowest mean flow for some number of consecutive days. Any 

combination of number of days of mean minimum flow and 

years of recurrence may be used to determine the low-flow frequencies. The annual series for the determination of low-flow 

frequencies for this study was based on a climatic year, which 

is from April 1 of a given year to the following March 31. Use 

of a climatic year rather than a water year allows for an analysis of an uninterrupted low-flow period, which in Connecticut 

typically occurs in late September and early October. 

Low-flow frequencies were computed for selected days 

and frequencies for 91 streamgaging stations, with 10 or more 

years of continuous record (table 3 in back of report). Lowflow frequencies are based on the D-day, Y-year frequency 

statistic of daily mean flow. This statistic is the minimum 

consecutive D-day mean flow expected to occur once in any 

Y-year or that has a probability of 1/Y of not being exceeded 

in any given year. Three commonly used indices of lowflow frequencies were determined for this report: the 7-day, 

10-year low-flow frequency (7Q10); the 7-day, 2-year low-flow 

frequency (7Q2); and the 30-day, 2-year low-flow frequency 

(30Q2). The 7Q10 is the annual minimum average flow for 

7 consecutive days that has a 0.10 probability (1/recurrence 

interval) of not being exceeded in a given year. The 7Q2 is the 

annual minimum average flow for 2 consecutive days that has 

a 0.50 probability of not being exceeded in a given year. The 

30Q2 is the annual minimum average flow for 30 consecutive days that has a 0.50 probability of not being exceeded in 

a given year. The 7Q10 is used primarily in regulating waste 

disposal to streams. Under the Connecticut General Statutes 

(CT Water Quality Standards, 22a-417, http://www.epa.gov/

waterscience/standards/wqslibrary/ct/ct_1_wqs.pdf), waterquality standards incorporate low-flow frequency statistics 

to ensure that water-quality standards are met and that to a 

limited degree, aquatic habitat is protected. 

The USGS computer program Surface Water Time 

Series Statistics (SWSTAT; Lumb and others, 1990) was 

used to compute the low-flow frequencies (http://water.usgs.

gov/software/swstat.html, accessed on September 19, 2006). 

SWSTAT determines the annual series of minimum mean 

flows, ranks them, fits them to a log-Pearson type III distribution, and plots the resulting line of fit through the annual 

values. A conditional probability adjustment is made for days 

of zero flows. A determination of the data fit to the distribution, and the eventual low-flow frequency values to be used 

are based on the professional judgment of the hydrologist. The 

reliability of estimates of low-flow frequencies as an indicator 

of probable future conditions is closely related to the length 

of record used and whether the record is reasonably representative of long-term flow characteristics. When the period of 

record used to compute the low-flow statistics is sufficiently 

long (typically at least 10 years), the statistics can be an indicator of probable future conditions (Searcy, 1959). 

Estimates of the 7Q10 for the 91 stations were compared 

to low-flow durations. For the majority (72 of 91) of streamgaging stations, 7Q10 estimates were less than the 99-percent 

flow duration. Seventeen stations had 7Q10 estimates between 

the 99- and 97-percent flow durations. The Housatonic River 

(USGS streamgaging station 01205500) and Tenmile River 

(01200000) had slightly higher 7Q10 estimates between 95- 

and 90-percent flow duration and 90- and 85-percent flow 

duration, respectively. 

Monthly Median Streamflows

Monthly median streamflows were computed for 

91 streamgaging stations as the median of individual daily 

mean streamflows for all complete months during the period 

of record at the station (table 4 in back of report). The August 

median flow is an important statistical measure for fisheries 

and often is used for summer maintenance of aquatic habitat in 

New England streams (U.S. Fish and Wildlife Service, 1981).

To compare August median flows across basins, the 

flows were divided by their respective drainage areas (“normalized”). At the 27 index stations, the estimated normalized 

August median flows ranged from 0.06 to 0.96 ft3/s/mi2, with 

a median of 0.19 ft3/s/mi2. Clear Brook, an index station with 
Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites 5

a drainage area less than 1 mi2, was a statistical outlier with a 

normalized August median flow of 2.37 ft3/s/mi2. At the 

64 non-index stations (basins with flow alteration), the estimated normalized August median flows ranged from 0.15 to 

1.77 ft3/s/mi2, with a median of 0.35 ft3/s/mi2. The normalized 

August median flows were larger in basins with flow alteration 

than the normalized August median flows in basins with natural flow, indicating point-source discharges (e.g., wastewater 

releases from sewage-treatment facilities or industry) may be 

increasing August median flows. In addition, the data indicated a slightly larger range in the normalized August median 

flows for larger basins (greater than 45 mi2) with flow alteration—0.15 to 1.34 ft3

/s/mi2 for basins less than 40 mi2 and 0.15 

to 1.77 ft3/s/mi2 for basins between 45 and 100 mi2. A common time period was not used to compare flows normalized 

by drainage area; therefore, the differences in flows per square 

mile between the stations with and without flow alteration are 

partly attributed to the varying record lengths. 

Estimation of Low-Flow Statistics at 

Short-Term Stations and Partial-Record 

Sites

Estimates of streamflow often are needed for streamflowgaging stations with short periods of record that may not 

reflect long-term hydrologic conditions, or for partial-record 

sites with only a discrete number of base-flow measurements. 

Through correlation and streamflow-record augmentation 

methods, low-flow statistics for the short-term stations and 

partial-record sites can be estimated. Estimates can be made 

on the basis of the relation between base flow at the short-term 

station or base-flow measurements at the partial-record site 

and concurrent daily streamflows at a nearby, hydrologically 

similar index station. Because the relation is derived from base 

flows, the only estimated statistics for the short-term stations 

and partial-record sites are low-flow statistics. For this study, 

the relation is defined by use of a streamflow-record augmentation method known as the Maintenance of Variance Extension, type 3 (MOVE.3) (Vogel and Stedinger, 1985). 

Streamflow data for 12 streamgaging stations with daily 

mean records between 3 and 10 years, referred to as shortterm stations, were retrieved from the NWIS database 

(http://waterdata.usgs.gov/ct/nwis/nwis, accessed on 

September 12, 2006). In Connecticut, the USGS operated 

a network of 90 partial-record sites from 1960 to 1980. 

Partial-record sites do not have continuous stage-recording 

equipment, and only periodic streamflow measurements are 

made. Streamflow measurements for these sites have been 

published in the annual series of USGS water-data reports. 

Fifty-six of the 90 partial-record sites were excluded from 

this statistical analyses because of flow alteration (water 

withdrawals, diversions, reservoir operations, or point 

discharges) in the upstream basins or because the number of 

base-flow measurements was too small for statistical analysis. 

The 12 short-term stations and 34 partial-record sites that were 

identified as having natural or near-natural flows were used 

in the correlation and MOVE.3 methods (fig. 2). Descriptive 

information for the short-term stations and partial-record sites 

is listed in tables 5 and 6 (in back of report), respectively. 

An index station used to estimate flows at short-term 

stations and partial-record sites must satisfy several criteria: 

(1) the flow is natural, (2) a portion of its period of record 

coincides with that at the short-term station or partial-record 

site, and (3) its period of record is substantially longer than 

that of the short-term station or partial-record station. In 

addition, the concurrent flows for the short-term stations or 

partial-record sites and index stations should plot linearly in 

log-space and be highly correlated. Ideally, index stations 

would be geographically close to the partial-record site or 

short-term station, have comparable drainage-area sizes, have 

the surface-water drainage area as determined by topography 

be coincident with the ground-water drainage area, and have 

similar geologic and hydrologic characteristics. 

Some short-term stations and partial-record sites cross 

state boundaries and have similar climatic and geologic 

characteristics to index stations in adjacent states. A total of 

38 index stations in Connecticut and adjacent states—

27 stations in Connecticut, 4 in Massachusetts, and 7 in 

Rhode Island—were used to correlate concurrent flows with 

the short-term stations and partial-record sites (fig. 2). Basin 

characteristics for index stations, short-term stations, and 

partial-record sites are presented in table 7 (in back of report). 

Scatterplots of the log-transformed flows at each shortterm station and partial-record site and same-day log-transformed daily mean flow at each of the index stations were 

created to evaluate the relation between the sites. Because 

streamflow data are highly skewed with a few very high 

values, a log transformation is commonly done to linearize the 

data. The pattern of the scatter in a linear relation indicates the 

strength of the relation between the flows at the two stations: 

a narrow scatter band indicates a high degree of association 

between the flow at the two stations, and a wide scatter band 

indicates a lesser degree of association. When the scatterplots indicate a linear relation between the log-transformed 

flows of the two stations, the MOVE.3 method can be used to 

develop an equation that relates flow at the short-term station 

or partial-record site to that at the long-term index station. For 

stations with zero flows, a constant of 0.005 ft3/s was added to 

derive the linear relation of the log transformation of the data 

and was then subtracted to compute the low-flow statistics 

using the MOVE.3 equation. 

Correlation coefficients were calculated and used as 

indicators of linearity. MOVE.3 equations were developed for 

stations where the correlation coefficients were greater than 

0.8; correlation coefficients less than 0.8 were considered 

less reliable. As an example, the MOVE.3 relation between a 

partial-record station, Haleys Brook (0118750), and an index 

station, Pendleton Brook (01118300), is shown in figure 3. 

Generally, each short-term station and partial-record site was 
6 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Figure 2. Locations of index stations, short-term stations, and partial-record sites used for correlation of base flows.

Massachusetts

New York Rhode Island

New York

Housatonic River

7

6

5

4

3

2

1

98

97

96

94

84

66

64

63

61 60

48

47

46

45

37

35

33

28

24

19

16

145

144

136

135

130

122

119

116

103

100

9

8

93

95

92

91

90 87

82

52 49

44 43

42

40

39

36

31

30

27

21

20

18

17

15

12

10

142

127

125

123

121

110

107

74

69 62

57

146

128

113

112

111

102 101

0 10 20 MILES

0 10 20 KILOMETERS

Long Island Sound

Connecticut

EXPLANATION

Base from U.S. Geological Survey digital data,1:24,000, 1969–84, Connecticut State Plane projection

Index drainage basinShort-term drainage basinPartial-record drainage basinIndex station and identifierPartial-record site and identifierShort-term streamgaging station  and identifier

Quinnipiac River

Connecticut River

Thames River

ni mraF t g no i R ev r

6811

72° 73°

42°41°
Estimation of Low-Flow Statistics at Short-Term Stations and Partial-Record Sites 7

correlated with one or more nearby index stations (table 8 in 

back of report). One index station was chosen to develop the 

final MOVE.3 equation based on (1) correlation coefficient, 

(2) proximity of the index station to the short-term station or 

partial-record site, (3) similarity in the drainage-area size and 

geologic characteristics of the basins, and (4) visual observation of the linear relation and residual plots. 

Low-flow statistics 99-, 98-, 97-, 95-, 90-, and 85-percent 

flow durations; the 7-day, 10- and 2-year low flows, and the 

30-day, 2-year low flow; and the August median flow were 

estimated at 31 of the 34 partial-record sites and at 7 of the 12 

short-term stations (table 9 in back of report). The MOVE.3 

mathematical method was used to estimate the low-flow statistics. Several short-term stations and partial-record sites did not 

correlate or showed poor correlations with the index stations in 

the region indicating that the index stations may not represent 

the hydrologic characteristics of the river or provide useful information that can be transferred to other sites to make 

estimates of streamflow. Three partial-record sites—Fenton 

River (01121350), Latimer Brook (01127790), and Patterson 

Brook (01208900)—had poorly defined relations to nearby 

index stations (correlation coefficients 0.8); subsequently, no 

low-flow statistics were derived for these sites. Five short-term 

stations—Hop Brook (01189180), Podunk River (01190055), 

Deming Brook (01198860), Ledgy Brook (01198870), Weekeepeemee Brook (01203805)—had poorly defined relations 

to nearby index stations (correlation coefficients 0.8) and no 

low-flow statistics were derived for these stations. 

Figure 3. An example of the MOVE.3 relation between a partial-record station, Haleys Brook (0118750), and an index 

station, Pendleton Brook (01118300). Both stations are in Connecticut.

-1.50 -0.75 0 0.75 1.50

-1.50

-0.75

0

0.75

1.50

PENDLETON BROOK (01118300) BASE-10 LOGARITHMIC TRANSFORMATION 

OF STREAMFLOW, IN CUBIC FEET PER SECOND

Correlation coefficient = 0.97

 HALEYS BROOK (01118750) BASE-10 LOGARITHMIC TRANSFORMATION 

OF STREAMFLOW, IN CUBIC FEET PER SECOND

Same day streamflows

MOVE.3 relation
8 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Summary

Water-resources managers face considerable challenges 

due to growing demands on finite freshwater supplies and the 

need to safeguard the riverine ecosystems. The state government in Connecticut is working to integrate water allocation 

and use with protecting the ecological integrity of the state’s 

rivers. Current estimates of streamflow statistics at streamgaging stations and partial-record sites will aid the state government in doing this. The U.S. Geological Survey (USGS), in 

cooperation with the Connecticut Department of Environmental Protection and New England Interstate Water Pollution 

Control Commission (NEIWPCC), computed streamflow statistics for 129 stream sites in Connecticut to provide information to state and local officials for water-resource, regulatory, 

and other management decisions. Flow durations, low-flow 

frequencies, and monthly median flows were computed for 

91 streamgaging stations (operated 10 or more years), 7 shortterm stations (operated less than 10 years), and 31 partialrecord sites. Different methods were used for statistical analyses, depending on the type of station operated and quantity of 

data collected. 

The estimated streamflow statistics for the 91 long-term 

continuous-record streamgaging stations include the 99-, 

98-, 97-, 95-, 90-, 85-, 80-, 75-, 70-, 60-, 50-, 40-, 30-, 25-, 

20-, 10-, 5-, and 1-percent flow durations; the 7-day, 10- and 

2-year low flow frequency and the 30-day, 2-year low flow 

frequency; and monthly median flows. Streamflow estimates 

were computed for each station using data collected through 

water year 2005. 

Long-term streamgaging-station records provide the 

best data for estimating the magnitude and probability of 

flows; however, for many proposed water-resources projects, only a short record or a limited number of discrete flow 

measurements may be available. Through correlation and 

a streamflow-record augmentation method, referred to as 

the Maintenance of Variance Extension (MOVE.3) method, 

low-flow statistics were estimated for short-term stations and 

partial-record sites based on of the relation between base-flow 

measurements at the partial-record site or daily mean (base) 

flows at the short-term station and concurrent daily streamflows at a nearby, hydrologically similar index station. 

The estimated low-flow statistics for the 7 short-term 

stations and 31 partial-record sites include the 99-, 98-, 97-, 

95-, 90-, and 85-percent flow durations; the 7-day, 10-year 

low flow; 7-day, 2-year low flow; and 30-day, 2-year low-flow 

frequencies; and the August median flow. Low-flow statistics could not be estimated for some short-term stations and 

partial-record sites because base-flow relations with the index 

stations did not correlate or showed low correlations indicating 

that the index stations may not represent the hydrologic characteristics of these short-term stations or partial-record sites.

Acknowledgments

The author thanks Gregory Granato of the USGS 

for providing valuable assistance with the Streamflow 

Record Augmentation technique. Also, the author thanks 

Pamela Lombard and Amy McHugh of the USGS, and 

Lee Dunbar of the Connecticut Department of Environmental 

Protection for providing technical reviews of the report. 

Christopher Bellucci, Mary Becker, and Robert Gilmore 

provided help determining the extent of streamflow alteration 

in various basins.

Selected References

Ahearn, E.A., Ries, K.G., III, and Steeves, P.A., in press, 

StreamStats: U.S. Geological Survey Web application for 

streamflow statistics in Connecticut: U.S. Geological 

Survey Fact Sheet 2006–3129, 4 p.

Cervione, M.A., Jr., 1982, A method for estimating the 7-day, 

10-year low flow of streams in Connecticut: Connecticut 

Water Resources Bulletin, v. 34, 17 p. 

Cervione, M.A., Jr., Mazzaferro, D.L., and Melvin, R.L., 1972, 

Water resources inventory of Connecticut, Part 6, upper 

Housatonic River basin: Connecticut Water Resources 

Bulletin, v. 21, 84 p.

Handman, E.H., Haeni, F.P., and Thomas, M.P., 1986, 

Water resources inventory of Connecticut, Part 9, Farmington River basin: Connecticut Water Resources Bulletin, 

v. 29, 91 p.

Hardison, C.H., and Moss, M.E., 1972, Accuracy of lowflow characteristics estimated by correlation of base-flow 

measurements, Manual of Hydrology—Part 2, Low-flow 

techniques: U.S. Geological Survey Water-Supply Paper 

1542–B, p. 35–55. 

Helsel, D.R., and Hirsch, R.M., 1992, Statistical methods in 

water resources: Studies in Environmental Science, v. 49, 

New York, Elsevier Science Publishers, 529 p.

Hirsch, R.M., 1982, A comparison of four streamflow record 

extension techniques: Water Resources Research, v. 18, 

no. 4, p. 1,081–1,088. 

Insightful, Inc., 2006, SPLUS version 7 modern statistics and 

advanced graphics: Cambridge, Mass., 558 p.

Lumb, A.M., Kittle, J.L., Jr., and Flynn, K.M., 1990, Users 

manual for ANNIE, a computer program for interactive 

hydrologic analyses and data management: U.S. Geological Survey Water-Resources Investigations Report 89–4080, 

236 p. 
Selected References 9

Mazzaferro, D.L., Handman, E.H., and Thomas, M.P., 1979, 

Water resources inventory of Connecticut, Part 8, 

Quinnipiac River basin: Connecticut Water Resources 

Bulletin, v. 27, 88 p.

Randall, A.D., Thomas, M.P., Thomas, C.E., Jr., and 

Baker, J.A., 1966, Water resources inventory of Connecticut, Part 1, Quinebaug River basin: Connecticut Water 

Resources Bulletin, v. 8, 102 p.

Ries, K.G., III, 1994a, Estimation of low-flow duration discharges in Massachusetts: U.S. Geological Survey WaterSupply Paper 2175, 50 p.

Ries, K.G., III, 1997, August median streamflows in Massachusetts: U.S. Geological Survey Water-Resources Investigations Report 97–4190, 27 p. 

Ries, K.G., III, 1999, Streamflow measurements, basin 

characteristics, and streamflow statistics for low-flow 

partial-record stations operated in Massachusetts from 1989 

through 1996: U.S. Geological Survey Water-Resources 

Investigations Report 99–4006, 162 p. 

Riggs, H.C., 1972, Low-flow investigations: U.S. Geological 

Survey Techniques of Water-Resources Investigations, 

book 4, chap. B1, 18 p.

Ryder, R.B., Cervione, M.A., Jr., Thomas, C.E., Jr., and 

Thomas, M.P., 1970, Water resources inventory of Connecticut, Part 4, southwestern coastal river basins: Connecticut 

Water Resources Bulletin, v. 17, 54 p.

Ryder, R.B., Thomas, M.P., and Weiss, L.A., 1981, Water 

resources inventory of Connecticut, Part 7, upper Connecticut River basin: Connecticut Water Resources Bulletin, 

v. 24, 78 p.

Searcy, J.K., 1959, Flow-duration curves. Manual of hydrology—Part 2, Low-flow techniques: U.S. Geological Survey 

Water-Supply Paper 1542–A, 33 p. 

Soller, D.R., and Packard, P.H., 1998, Digital representation 

of a map showing the thickness and character of Quaternary 

sediments in the glaciated United States east of the Rocky 

Mountains: U.S. Geological Survey Digital Data Series 

DDS–38, one CD-ROM.

Stone, J.R., Schafer, J.P., London, E.H., and Thompson, W.B., 

1992, Surficial materials map of Connecticut: U.S. Geological Survey Special Map, 2 sheets, scale 1:125,000. 

Thomas, C.E., Jr., Cervione, M.A., Jr., and Grossman, I.G., 

1968, Water resources inventory of Connecticut, Part 3, 

lower Thames and southeastern coastal river basins: 

Connecticut Water Resources Bulletin, v. 15, 105 p.

Thomas, M.P., Bednar, G.A., Thomas, C.E., Jr., and 

Wilson, W.E., 1967, Water resources inventory of 

Connecticut, Part 2, Shetucket River basin: Connecticut 

Water Resources Bulletin, v. 11, 96 p.

Thomas, W.O., Jr., and Stedinger, J.R., 1991, Estimating lowflow characteristics at gaging stations and through the use 

of base-flow measurements: U.S. Geological Survey OpenFile Report 91–244, p. 197–205. 

U.S. Fish and Wildlife Service, 1981, Interim regional policy 

for New England streamflow recommendations: Newton 

Corner, Mass., U.S. Fish and Wildlife Service, 3 p. 

Vogel, R.M., and Stedinger, J.R., 1985, Minimum 

variance streamflow record augmentation procedures: 

Water Resources Research, v. 21, no. 5, p. 715–723. 

Weiss, L.A., 1983, Evaluation and design of a streamflow data 

network for Connecticut: Connecticut Water Resources 

Bulletin, v. 36, 30 p. 

Weiss, L.A., Bingham, J.W., and Thomas, M.P., 1982, 

Water resources inventory of Connecticut, Part 10, lower 

Connecticut River basin: Connecticut Water Resources 

Bulletin, v. 31, 85 p.

Wilson, W.E., Burke, E.L., and Thomas, C.E., Jr., 1974, 

Water resources inventory of Connecticut, Part 5, lower 

Housatonic River basin: Connecticut Water Resources 

Bulletin, v. 19, 79 p.

Tables 1–9
12 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 1. Descriptions of streamgaging stations with 10 or more years of continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly median flow statistics.—Continued [USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station] Map reference number (fig. 1) USGS station number Latitude (decimal degrees) Longitude (decimal degrees) River name Town Years of record Period of record Drainage area (mi2

)

7 01118300 41.4748 -71.8342 Pendleton Brook North Stonington 47 Oct 1958–Sep 2005 4.02

13 01119500 41.7507 -72.2656 Willimantic River Mansfield 74 Oct 1931–Sep 2005 12114 01120000 41.7276 -72.3023 Hop River Columbia 39 Oct 1932–Oct 1971 74.816 01120500 41.9265 -72.0570 Safford Brook Woodstock 31 Oct 1950–Oct 1981 4.1519 01121000 41.8437 -72.1690 Mount Hope River Ashford 65 Oct 1940–Sep 2005 28.622 01122000 41.7198 -72.1956 Natchaug River Windham 69 Oct 1930–Sep 1989, Oct 1995–Sep 2005 17423 01122500 41.7004 -72.1820 Shetucket River Windham 77 Oct 1928–Sep 2005 40424 01123000 41.6718 -72.0523 Little River Canterbury 54 Oct 1951–Sep 2005 3025 01124000 42.0223 -71.9556 Quinebaug River Thompson 74 Oct 1931–Sep 2005 15526 01124151 41.9434 -71.9004 Quinebaug River Thompson 29 May 1984–Sep 2000, Oct 2000–Sep 2005 17228 01125490 41.9276 -71.9301 Little River Putnam 10 Aug 1961–Sep 1971 35.829 01125500 41.9093 -71.9129 Quinebaug River Putnam 50 Jan 1930–Sep 1969, Oct 1995–Sep 2005 32832 01126000 41.8373 -71.8853 Fivemile River Killingly 34 Nov 1937–Oct 1971 57.834 01126500 41.7104 -71.8859 Moosup River Plainfield 39 Oct 1932–Oct 1971 83.635 01126600 41.7654 -71.9565 Blackwell Brook Brooklyn 13 Oct 1963–Oct 1976 1737 01126950 41.5848 -71.9334 Pachaug River Griswold 12 Aug 1961–Oct 1973 5338 01127000 41.5979 -71.9842 Quinebaug River Griswold 87 Oct 1918–Sep 2005 71341 01127500 41.5587 -72.1215 Yantic River Norwich 75 Oct 1930–Sep 2005 89.350 01184000 41.9873 -72.6054 Connecticut River Suffield 77 Aug 1928–Sep 2005 9,66051 01184100 41.9607 -72.7104 Stony Brook Suffield 24 May 1981–Sep 2005 10.453 01184490 41.9139 -72.5500 Broad Brook East Windsor 39 Aug 1961–Sep 1976, May 1982–Sep 2005 15.554 01184500 41.9118 -72.5629 Scantic River East Windsor 43 Oct 1928–Oct 1971 98.255 01186000 41.9629 -73.0176 West Branch Farmington River Barkhamsted 50 Oct 1955–Sep 2005 13156 01186100 41.9309 -73.0818 Mad River Winchester 13 Oct 1956–Sep 1969 18.558 01186500 41.9673 -73.0340 Still River Colebrook 55 Oct 1948–Jul 1967, Jul 1969–Sep 2005 8559 01187000 41.9537 -73.0137 West Branch Farmington River Barkhamsted 26 Oct 1929–Sep 1955 21760 01187300 42.0373 -72.9390 Hubbard River Hartland 66 Jan 1938–Sep 1955, Oct 1956–Sep 2005 19.961 01187400 42.0343 -72.9298 Valley Brook Hartland 32 Oct 1940–Sep 1972 7.0363 01187800 41.8207 -72.9701 Nepaug River New Hartford 52 Oct 1921–Sep 1955, Oct 1958–Sep 1972, 

Oct 1998–Sep 2001

23.5

64 01187850 41.7957 -72.9512 Clear Brook Burlington 55 Oct 1921–Oct 1973, Oct 1998–Sep 2001 0.59
Table 1 13

Table 1. Descriptions of streamgaging stations with 10 or more years of continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly median flow statistics.—Continued[USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station]

Map 

reference 

number

(fig. 1)

USGS 

station 

number

Latitude 

(decimal 

degrees)

Longitude 

(decimal 

degrees)

River name Town

Years 

of 

record 

Period of record 

Drainage 

area 

(mi2)

65 01187980 41.7993 -72.9254 Farmington River Avon 15 Nov 1962–Sep 1977 360

66 01188000 41.7862 -72.9648 Burlington Brook Burlington 74 Oct 1931–Sep 2005 4.167 01188090 41.7559 -72.8868 Farmington River Farmington 28 Oct 1977–Sep 2005 37868 01189000 41.6732 -72.9007 Pequabuck River Bristol 64 Oct 1941–Sep 2005 45.870 01189390 41.9543 -72.7795 East Branch Salmon Brook Granby 13 Oct 1963–Oct 1976 39.571 01189500 41.9373 -72.7762 Salmon Brook East Granby 17 Oct 1946–Sep 1963 67.472 01189995 41.9084 -72.7607 Farmington River Simsbury 34 Oct 1971–Sep 2005 57773 01190000 41.9115 -72.6873 Farmington River Windsor 59 Oct 1928–Feb 1988 59075 01190100 41.7120 -72.7370 Piper Brook Newington 13 Jun 1958–Oct 1971 14.676 01190200 41.7045 -72.7257 Mill Brook Newington 13 May 1958–Oct 1971 2.6577 01190300 41.7704 -72.7370 Trout Brook West Hartford 13 May 1958–Oct 1971 14.678 01190500 41.7340 -72.7137 South Branch Park River Hartford 45 Oct 1936–Oct 1981 39.979 01190600 41.8254 -72.7393 Wash Brook Bloomfield 13 May 1958–Oct 1971 5.5480 01191000 41.7843 -72.7081 North Branch Park River Hartford 50 Nov 1936–Sep 1986 26.881 01191500 41.7601 -72.6945 Park River Hartford 25 Oct 1936–Oct 1981 72.583 01192500 41.7832 -72.5873 Hockanum River East Hartford 74 Oct 1919–Sep 1921, Oct 1928–Oct 1971, 

Aug 1976–Sep 2005

73.4

84 01192600 41.7182 -72.5398 South Branch Salmon Brook Glastonbury 16 Oct 1960–Sep 1976 0.9485 01192650 41.6640 -72.5843 Roaring Brook Glastonbury 10 Oct 1961–Sep 1971 24.386 01192700 41.6190 -72.7129 Mattabesset River Berlin 10 Oct 1961–Sep 1971 46.588 01192883 41.5201 -72.7059 Coginchaug River Middlefield 25 Dec 1980–Sep 2005 29.889 01192890 41.5362 -72.6873 Coginchaug River Middlefield 19 Oct 1961–Dec 1980 34.794 01193500 41.5523 -72.4493 Salmon River East Hampton 77 Oct 1928–Sep 2005 10096 01193800 41.4284 -72.4226 Hemlock Valley Brook East Haddam 16 Jul 1960–Oct 1976 2.6297 01194000 41.4418 -72.3329 Eightmile River East Haddam 29 Oct 1937–Sep 1966 20.198 01194500 41.4279 -72.3342 East Branch Eightmile River Lyme 48 Oct 1937–Sep 1981, Sep 2002–Sep 2005 22.399 01195000 41.3029 -72.5154 Menunketesuck River Clinton 24 Oct 1941–Sep 1963, Oct 1965–Sep 1967 11.2

100 01195100 41.3059 -72.5312 Indian River Clinton 24 Nov 1981–Sep 2005 5.68103 01195200 41.2826 -72.6193 Neck River Madison 20 Sep 1961–Nov 1981 6.55104 01195490 41.6018 -72.8837 Quinnipiac River Southington 18 Nov 1987–Sep 2005 17.4105 01196500 41.4495 -72.8409 Quinnipiac River Wallingford 75 Oct 1930–Sep 2005 115
14 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 1. Descriptions of streamgaging stations with 10 or more years of continuous record in Connecticut used to compute flow durations, low-flow frequencies, and monthly median flow statistics.—Continued [USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station] Map reference number (fig. 1) USGS station number Latitude (decimal degrees) Longitude (decimal degrees) River name Town Years of record Period of record Drainage area (mi2

)

106 01196580 41.3687 -72.8415 Muddy River North Haven 11 Sep 1962–Sep 1973 18

108 01196620 41.4209 -72.9029 Mill River Hamden 29 Oct 1968–Sep 1970, Oct 1978–Sep 2005 24.5109 01198500 42.0240 -73.3418 Blackberry River North Canaan 22 Oct 1949–Oct 1971 45.9114 01199000 41.9573 -73.3693 Housatonic River Salisbury 93 Oct 1912–Sep 2005 634115 01199050 41.9423 -73.3910 Salmon Creek Salisbury 44 Oct 1961–Sep 2005 29.4116 01199200 41.8243 -73.4301 Guinea Brook Sharon 21 Aug 1960–Oct 1981 3.5117 01200000 41.6589 -73.5289 Tenmile River Wingdale, New York 72 Oct 1929–Sep 1987, Oct 1991–Sep 2005 203118 01200500 41.6531 -73.4898 Housatonic River New Milford 65 Oct 1940–Sep 2005 996119 01201190 41.6079 -73.4246 West Aspetuck River New Milford 10 Oct 1962–Sep 1972 23.8120 01201500 41.5201 -73.4182 Still River New Milford 35 Oct 1931–Sep 1966 67.5122 01201930 41.7895 -73.2590 Marshepaug River Goshen 14 Oct 1967–Oct 1981 9.24124 01203000 41.7233 -73.2936 Shepaug River Roxbury 41 Oct 1930–Sep 1971 132126 01203600 41.5757 -73.1787 Nonewaug River Woodbury 19 Oct 1962–Sep 1976, Oct 1978–Sep 1979, 

Aug 2000–Sep 2000, Oct 2001–Sep 2005

17.7

129 01204000 41.4807 -73.2246 Pomperaug River Southbury 73 Oct 1932–Sep 2005 75.1130 01204800 41.3629 -73.2184 Copper Mill Brook Monroe 18 Oct 1958–Oct 1976 2.45131 01205500 41.3840 -73.1676 Housatonic River Oxford 77 Oct 1928–Sep 2005 1,544132 01205600 41.8009 -73.1234 West Brook Naugatuck River Torrington 40 Oct 1956–Sep 1992, Oct 1993–Apr 1997 33.8133 01205700 41.8034 -73.1179 East Branch Naugatuck River Torrington 41 Oct 1956–Apr 1997 13.6134 01206000 41.7043 -73.0643 Naugatuck River Thomaston 29 Oct 1930–Sep 1959 71135 01206400 41.7295 -73.0532 Leadmine Brook Harwinton 13 Oct 1960–Oct 1973 19.6136 01206500 41.7018 -73.0573 Leadmine Brook Thomaston 29 Oct 1930–Sep 1959 24.3137 01206900 41.6737 -73.0696 Naugatuck River Thomaston 45 Oct 1960–Sep 2005 99.8138 01208013 41.6537 -73.0948 Branch Brook Watertown 15 Oct 1974–Oct 1989, Apr 1993–May 1993 20.8139 01208420 41.5059 -73.0582 Hop Brook Naugatuck 20 Oct 1969–Oct 1989 16.3140 01208500 41.4423 -73.0626 Naugatuck River Beacon Falls 83 Oct 1918–Sep 1924, Oct 1928–Sep 2005 260141 01208873 41.1798 -73.2190 Rooster River Trumbull 28 Apr 1977–Sep 2005 10.6143 01208925 41.1657 -73.2704 Mill River Fairfield 33 Oct 1972–Sep 2005 28.6144 01208950 41.1529 -73.3059 Sasco Brook Fairfield 41 Oct 1964–Sep 2005 7.38145 01208990 41.2945 -73.3951 Saugatuck River Redding 41 Oct 1964–Sep 2005 21147 01209500 41.1709 -73.3662 Saugatuck River Westport 35 Oct 1932–Sep 1967 79.8148 01209700 41.1637 -73.4193 Norwalk River Wilton 43 Sep 1962–Sep 2005 30
Table 2 15

Table 2. Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut.[Statistics based on data through water year 2005; USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station]

Map 

reference 

number 

(fig. 1) 

USGS 

station 

number

River name

Years 

of 

record 

 Drainage 

area 

(mi2)

Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second

99 98 97 95 90 85 80 75 70 60 50 40 30 25 20 10 5 1

7 01118300 Pendleton Brook 47 4.02 0.07 0.12 0.18 0.30 0.57 0.91 1.30 1.80 2.50 4.00 5.70 7.60 9.80 11.0 13.0 19.0 26.0 50.0

13 01119500 Willimantic River 74 121 13.0 17.0 20.0 25.0 34.0 44.0 54.0 67.0 82.0 111 148 190 245 277 317 450 609 1,17014 01120000 Hop River 39 74.8 4.30 5.60 6.30 7.80 11.0 15.0 21.0 28.0 36.0 52.0 73.0 100 133 155 183 283 400 78516 01120500 Safford Brook 31 4.15 0.02 0.05 0.10 0.15 0.31 0.51 0.77 1.10 1.50 2.40 3.60 5.00 7.00 8.50 10.0 18.0 30.0 76.019 01121000 Mount Hope River 65 28.6 1.10 1.50 1.90 2.50 4.10 6.00 8.20 11.0 14.0 22.0 31.0 42.0 56.0 65.0 75.0 113 165 35722 01122000 Natchaug River 69 174 6.00 11.0 17.0 24.0 36.0 48.0 60.0 77.0 95.0 136 193 256 337 388 451 675 950 1,90023 01122500 Shetucket River 77 404 45.0 54.0 61.0 75.0 103 130 162 199 243 340 465 612 800 919 1,070 1,590 2,230 3,96024 01123000 Little River 54 30 4.90 5.50 6.10 7.10 8.90 11.0 13.0 16.0 19.0 26.0 36.0 47.0 60.0 69.0 80.0 115 167 36025 01124000 Quinebaug River 74 155 15.0 19.0 22.0 26.0 37.0 49.0 62.0 77.0 94 135 184 240 311 358 416 607 816 1,38026 01124151 Quinebaug River 29 172 18.0 21.0 24.0 28.0 39.0 52.0 66.0 84.0 101 140 189 251 335 388 450 680 964 1,71028 01125490 Little River 10 35.8 0.60 0.90 1.04 1.70 2.92 4.40 6.20 8.20 11.0 18.0 25.0 34.2 46.0 56.0 71.0 115 166 33329 01125500 Quinebaug River 50 328 35.7 42 48 59 84 110 136 165 195 274 369 477 620 711.5 830 1,200 1,620 2,80032 01126000 Fivemile River 34 57.8 5.60 7.40 8.80 12.0 20.0 27.0 33.0 38.0 43.0 55.0 71.0 91.0 116 131 150 207 270 43834 01126500 Moosup River 39 83.6 5.80 7.40 8.80 12.0 18.0 24.0 32.0 41.0 54.0 80.0 107 138 178 203 239 350 471 85235 01126600 Blackwell Brook 13 17 0.70 0.85 1.00 1.30 2.10 3.00 4.00 5.60 7.50 12.0 18.0 25.0 33.0 38.0 44.0 66.0 97.0 21237 01126950 Pachaug River 12 53 0.76 4.00 8.00 9.00 12.0 16.0 21.0 28.0 39.0 57.0 73.0 94.0 115 130 150 204 271 47638 01127000 Quinebaug River 87 713 53.0 94.0 110 147 232 298 366 440 510 695 910 1,170 1,500 1,700 1,960 2,790 3,700 6,12041 01127500 Yantic River 75 89.3 5.80 6.80 7.80 9.40 13.0 18.0 26.0 36.0 46.0 68.0 95.0 129 172 200 239 368 532 1,18050 01184000 Connecticut River 77 9,660 2,820 3,100 3,340 3,770 4,890 5,840 6,810 7,760 8,660 10,500 12,550 15,000 18,600 20,900 24,300 36,900 52,500 86,10051 01184100 Stony Brook 24 10.4 0.28 0.40 0.46 0.65 1.20 1.80 2.60 3.50 4.50 6.70 9.60 13.0 19.0 22.0 27.0 45.0 70.0 16053 01184490 Broad Brook 39 15.5 6.50 7.10 7.70 8.30 9.80 11.0 12.0 13.0 14.0 16.0 18.0 22.0 26.0 29.0 33.0 43.0 58.0 11554 01184500 Scantic River 43 98.2 20.0 23.0 25.0 30.0 36.0 43.0 50.0 56.0 62.0 76.0 95.0 119 150 170 196 290 390 63555 01186000 West Branch 

Farmington River

50 131 15.0 22.0 31.9 48.0 70.0 92.0 112 128.5 144 170 204 240 283 313 350 451 582 1,160

56 01186100 Mad River 13 18.5 0.40 0.50 0.66 0.90 1.50 2.10 2.80 3.40 4.40 7.40 11.0 16.0 23.0 28.0 35.0 63.0 94.0 22858 01186500 Still River 55 85 8.50 11.0 12.0 15.0 23.0 31.0 39.0 48.0 57.0 77.0 101 131 173 201 239 371 554 1,16059 01187000 West Branch 

Farmington River

26 217 37.0 43.0 49.0 58.0 78.0 95.0 110 122 140 182 240 313 403 468 555 863 1,230 2,450

60 01187300 Hubbard River 66 19.9 0.56 0.84 1.10 1.50 2.40 3.40 4.80 6.50 8.50 14.0 20.0 26.0 36.0 43.0 54.0 93.0 146 34261 01187400 Valley Brook 32 7.03 0.30 0.40 0.40 0.50 0.80 1.00 1.60 2.20 3.00 5.00 7.20 9.60 13.0 16.0 19.0 30.0 50.0 10963 01187800 Nepaug River 52 23.5 1.50 1.80 2.10 2.80 4.30 5.50 6.90 8.80 11.0 16.0 22.0 29.0 40.0 46.0 55.0 88.0 128 27064 01187850 Clear Brook 55 0.59 0.53 0.53 0.61 0.70 0.79 0.88 0.97 1.10 1.10 1.30 1.50 1.70 1.90 2.10 2.20 2.70 3.10 4.20
16 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 2. Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut.—Continued [Statistics based on data through water year 2005; USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station] Map refer- ence number (fig. 1) USGS station number River name Years of record Drain- age area (mi2

)

Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second

99 98 97 95 90 85 80 75 70 60 50 40 30 25 20 10 5 1

65 01187980 Farmington River 15 360 27.0 40.0 50.4 75.0 131 180 235 273 302 374 459 544 675 758 872 1,300 1,790 2,85066 01188000 Burlington Brook 74 4.1 0.65 0.78 0.88 1.00 1.30 1.70 2.00 2.40 2.80 3.80 5.00 6.40 8.00 9.20 11.0 17.0 26.0 61.067 01188090 Farmington River 28 378 124 140 155 171 211 262 297 324 350 406 474 555 675 761 879 1,300 1,810 3,22068 01189000 Pequabuck River 64 45.8 14.0 15.0 16.0 17.0 20.0 22.0 25.0 28.0 31.0 40.0 50.0 64.0 81.0 92.0 106 161 230 50070 01189390 East Branch Salmon 

Brook

13 39.5 7.90 8.50 9.00 10.0 12.0 14.0 17.0 20.0 23.0 31.0 43.0 58.0 75.0 85.0 97.0 134 182 358

71 01189500 Salmon Brook 17 67.4 13.0 15.0 17.0 19.0 24.0 28.0 32.0 37.0 43.0 56.0 72.0 92.0 116 134 163 272 388 77472 01189995 Farmington River 34 577 200 241 265 297 375 437 492 540 588 684 802 990 1,240 1,410 1,630 2,350 3,160 5,38073 01190000 Farmington River 59 590 25.0 78.0 132 188 244 297 354 409 465 585 708 866 1,090 1,240 1,450 2,110 2,890 5,18075 01190100 Piper Brook 13 14.6 1.90 2.60 3.20 4.20 5.50 6.40 7.20 8.00 8.80 10.0 13.0 17.0 23.0 28.0 33.0 48.0 69.0 15576 01190200 Mill Brook 13 2.65 0.48 0.53 0.58 0.60 0.73 0.84 1.00 1.10 1.20 1.50 1.80 2.20 2.70 3.10 3.60 6.10 11.0 31.077 01190300 Trout Brook 13 14.6 1.70 2.50 3.10 4.20 5.30 6.10 7.30 8.50 9.50 12.0 15.0 18.0 22.0 26.0 30.0 47.0 67.0 14678 01190500 South Branch Park 

River

45 39.9 11.0 13.0 14.0 16.0 19.0 21.0 24.0 26.0 29.0 36.0 45.0 55.0 70.0 80.0 93.0 144 215 499

79 01190600 Wash Brook 13 5.54 0.07 0.19 0.25 0.35 0.58 0.80 1.10 1.40 1.70 2.30 3.20 4.30 5.70 6.90 8.10 15.0 25.0 61.080 01191000 North Branch Park 

River

50 26.8 1.00 1.40 1.70 2.20 3.30 4.20 5.10 6.10 7.40 10.0 14.0 19.0 27.0 33.0 41.0 80.0 144 390

81 01191500 Park River 25 72.5 18.0 20.0 21.0 23.0 27.0 30.0 34.0 38.0 43.0 54.0 68.0 87.0 114 132 158 258 398 87883 01192500 Hockanum River 74 73.4 18.0 23.0 26.0 31.0 39.0 45.0 50.0 55.0 61.0 73.0 87.0 106 131 146 164 222 290 50884 01192600 South Branch 

Salmon Brook

16 0.94 0.31 0.33 0.36 0.42 0.51 0.62 0.71 0.79 0.86 1.00 1.20 1.50 1.80 2.00 2.30 3.00 3.70 5.86

85 01192650 Roaring Brook 10 24.3 4.40 4.90 5.40 6.40 7.40 8.30 9.50 11.0 12.0 15.0 20.0 28.0 36.0 41.0 49.0 73.0 102 19186 01192700 Mattabesset River 10 46.5 17.0 18.0 20.0 21.0 24.0 26.0 28.0 31.0 33.0 39.0 46.0 54.0 67.0 74.0 85.0 138 197 45488 01192883 Coginchaug River 25 29.8 1.17 1.50 1.90 2.60 4.78 7.00 9.70 13.0 17.0 26.0 35.0 48.0 62.0 72.0 86.0 139 203 38089 01192890 Coginchaug River 19 34.7 2.00 2.30 2.70 3.30 5.00 6.70 8.80 11.0 14.0 23.0 34.0 46.0 63.0 75.0 93.0 149 209 47594 01193500 Salmon River 77 100 6.50 8.50 10.0 13.0 19.0 25.0 32.0 42.0 54.0 83.0 116 157 205 236 274 402 569 1,16096 01193800 Hemlock Valley 

Brook

16 2.62 0.20 0.22 0.25 0.30 0.40 0.55 0.79 1.10 1.40 2.20 3.30 4.50 6.00 6.90 8.00 12.0 16.0 34.0

97 01194000 Eightmile River 29 20.1 0.60 1.00 1.30 1.60 2.50 3.50 5.00 6.70 8.70 16.0 24.0 33.0 43.0 50.0 58.0 85.0 119 26198 01194500 East Branch 

Eightmile River

48 22.3 0.65 1.10 1.40 1.90 3.40 4.90 6.80 9.00 12.0 20.0 29.0 39.0 50.0 58.0 68.0 101 140 287

99 01195000 Menunketesuck 

River

24 11.2 0.15 0.30 0.40 0.70 1.30 1.90 2.50 3.30 4.30 7.70 13.0 18.0 24.0 28.0 33.0 49.0 69.0 148

100 01195100 Indian River 24 5.68 0.10 0.15 0.20 0.29 0.50 0.75 1.10 1.60 2.20 4.10 5.80 8.00 11.0 13.0 15.0 22.0 31.0 69.0103 01195200 Neck River 20 6.55 0.06 0.11 0.15 0.29 0.60 0.98 1.40 2.00 2.50 4.30 6.60 9.30 12.0 15.0 17.0 27.0 38.0 85.0104 01195490 Quinnipiac River 18 17.4 4.60 5.10 5.40 6.30 8.10 9.80 11.0 13.0 15.0 19.0 23.0 27.0 33.0 37.0 42.0 61.0 88.0 192105 01196500 Quinnipiac River 75 115 36.0 41.0 44.0 50.0 61.0 70.0 79.0 88.0 98.0 122 151 187 229 257 295 420 582 1,190
Table 2 17

Table 2. Flow-duration statistics for 91 streamgaging stations with 10 or more years of continuous record in Connecticut.—Continued[Statistics based on data through water year 2005; USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station]

Map 

reference 

number 

(fig. 1) 

USGS 

station 

number

River name

Years 

of 

record 

 Drainage 

area 

(mi2)

Streamflow equaled or exceeded at indicated percentage of time, in cubic feet per second

99 98 97 95 90 85 80 75 70 60 50 40 30 25 20 10 5 1

106 01196580 Muddy River 11 18 1.20 1.50 1.60 2.00 2.60 3.20 4.00 5.20 6.20 9.00 13.0 19.0 26.0 31.0 38.0 62.0 97.0 211108 01196620 Mill River 29 24.5 2.30 3.20 3.70 4.40 6.30 7.80 9.40 12.0 14.0 20.0 29.0 38.0 48.2 56.0 65.0 98.0 147 354109 01198500 Blackberry River 22 45.9 3.50 4.40 5.00 6.10 8.74 11.0 14.0 18.0 22.0 30.0 40.0 52.4 71.0 83.0 101 160 241 555114 01199000 Housatonic River 93 634 117 139 152 177 230 277 323 373 429 560 732 939 1,210 1,400 1,620 2,390 3,220 5,340115 01199050 Salmon Creek 44 29.4 4.00 4.70 5.30 6.30 8.70 11.0 14.0 16.0 19.0 25.0 32.0 41.0 53.0 61.0 70.0 101 141 283116 01199200 Guinea Brook 21 3.5 0.00 0.01 0.04 0.07 0.19 0.35 0.59 0.96 1.40 2.60 3.80 5.50 7.80 9.20 11.0 17.0 24.0 46.0117 01200000 Tenmile River 72 203 4.30 5.60 6.30 7.80 11.0 15.0 21.0 28.0 36.0 52.0 73.0 100 133 155 183 283 400 785118 01200500 Housatonic River 65 996 173 201 221 257 331 409 492 580 676 896 1,160 1,480 1,910 2,190 2,530 3,670 4,940 8,240119 01201190 West Aspetuck 

River

10 23.8 0.95 1.30 1.60 2.20 3.00 4.00 5.30 7.10 9.70 16.0 21.0 29.0 38.0 44.0 53.0 79.0 152 204

120 01201500 Still River 35 67.5 16.0 18.0 19.0 21.0 26.0 30.0 34.0 40.0 45.0 59.0 75.0 96.0 123 140 164 250 348 600122 01201930 Marshepaug River 14 9.24 0.45 0.68 0.80 1.20 2.10 3.00 3.70 4.40 5.40 8.00 12.0 17.0 24.0 27.0 32.0 45.0 60.0 126124 01203000 Shepaug River 41 132 7.30 8.60 9.70 12.0 17.0 24.0 32.0 42.0 56.0 90.0 135 189 257 300 354 530 725 1,360126 01203600 Nonewaug River 19 17.7 0.80 1.00 1.20 1.60 2.70 3.50 4.40 5.40 7.00 11.5 16 23 30 35 42.0 65.0 99.0 238129 01204000 Pomperaug River 73 75.1 7.40 8.72 9.80 12.0 16.0 21.0 26.0 33.0 40.0 59.0 80.0 106 139 159 185 275 398 850130 01204800 Copper Mill Brook 18 2.45 0.10 0.14 0.17 0.21 0.35 0.53 0.70 0.90 1.20 1.90 2.80 3.80 4.90 5.70 6.80 11.0 16.0 37.2131 01205500 Housatonic River 77 1,544 63.0 75.5 87.0 108 240 440 625 800 974 1,390 1,870 2,450 3,180 3,630 4,140 5,900 7,400 12,700132 01205600 West Branch 

Naugatuck River

40 33.8 2.10 2.90 3.50 4.20 6.00 7.70 10.0 13.0 16.0 24.0 32.0 43.0 58.0 69.0 84.0 138 211 471

133 01205700 East Branch 

Naugatuck River

41 13.6 1.80 2.10 2.30 2.60 3.40 4.40 5.50 6.70 8.20 11.0 15.0 19.0 25.0 29.0 35.0 55.0 88.0 182

134 01206000 Naugatuck River 29 71 16.0 17.0 18.0 20.0 24.0 27.0 30.0 34.0 39.0 54.0 76.0 103 139 161 195 310 470 1,020135 01206400 Leadmine Brook 13 19.6 0.60 0.84 1.00 1.30 2.30 3.70 6.00 8.80 12.0 19.0 23.0 30.0 38.0 45.0 52.0 81.0 116 247136 01206500 Leadmine Brook 29 24.3 0.60 0.80 0.90 1.30 2.30 3.60 5.50 7.70 10.0 16.0 25.0 35.0 47.0 56.0 67.0 110 167 358137 01206900 Naugatuck River 45 99.8 13.0 15.0 17.0 19.0 26.0 33.0 40.0 50.0 61.0 86.0 114 149 193 224 267 435 676 1,570138 01208013 Branch Brook 15 20.8 0.41 0.55 0.74 1.50 3.60 5.30 7.00 8.30 9.80 13.0 17.0 23.0 32.0 37.0 43.0 67.0 109 383139 01208420 Hop Brook 20 16.3 0.85 1.10 1.30 1.80 3.10 4.60 6.10 7.60 9.40 14.0 20.0 26.0 33.0 37.0 44.0 70.0 116 280140 01208500 Naugatuck River 83 260 64.0 72.0 77.0 86.0 105 121 139 160 186 246 321 416 538 624 724 1,110 1,630 3,090141 01208873 Rooster River 28 10.6 1.10 1.40 1.50 1.80 2.60 3.20 3.90 4.60 5.50 7.30 9.40 12.0 14.0 16.0 19.0 30.0 49.0 135143 01208925 Mill River 33 28.6 1.30 1.80 2.00 2.60 4.10 5.50 7.10 8.90 11.0 15.0 21.0 28.0 38.0 45.0 53.6 85.0 121 273144 01208950 Sasco Brook 41 7.38 0.09 0.16 0.23 0.36 0.75 1.20 1.80 2.60 3.40 5.40 7.90 11.0 14.0 16.0 19.0 29.0 44.0 100145 01208990 Saugatuck River 41 21 0.35 0.62 0.89 1.30 2.60 4.10 6.20 8.50 11.0 18.0 25.0 34.0 44.0 50.0 60.0 92.0 129 258147 01209500 Saugatuck River 35 79.8 2.60 4.56 5.80 7.10 9.60 12.0 14.0 18.0 21.0 34.0 53.0 85.0 127 155 190 296 416 808148 01209700 Norwalk River 43 30 1.80 2.40 2.90 3.70 5.40 7.30 9.60 12.0 16.0 23.0 33.0 44.0 59.0 69.0 82.0 125 178 392
18 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 3. Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued [Low-flow frequency statistics are based on the climatic year, which begins on April 1 and ends on March 31, and on flow record through March 31, 2003. USGS, U.S. Geological Survey; mi2, square miles; ft3/s, cubic feet per second; --, no data; bold indicates Index Station] Map ref- erence number (fig. 1) USGS station number River name Town Years of record Drain- age area (mi2

)

Low-flow frequency statistic

7Q10

(ft3/s)

7Q2

(ft3/s)

30Q2

(ft3/s) Number of days and dates of zero flow

7 01118300 Pendleton Brook North Stonington 47 4.02 0.04 0.21 0.49 --

13 01119500 Willimantic River Mansfield 74 121 13.9 25.8 36.0 --14 01120000 Hop River Columbia 39 74.8 3.71 7.13 10.9 --16 01120500 Safford Brook Woodstock 31 4.15 0.02 0.15 0.34 (32) 7/21–21/1957, 8/3/1957, 8/7–24/1957, 9/10/1957, 

9/13/1957, 8/30–31/1965, 9/6–12/1965

19 01121000 Mount Hope River Ashford 65 28.6 0.93 2.25 4.00 --22 01122000 Natchaug River Windham 69 174 8.94 21.7 32.6 --23 01122500 Shetucket River Windham 77 404 44.7 72.6 97.5 --24 01123000 Little River Canterbury 54 30 4.50 6.81 8.87 --25 01124000 Quinebaug River Thompson 74 155 15.4 26.0 36.3 --26 01124151 Quinebaug River Thompson 29 172 13.6 22.0 34.2 --28 01125490 Little River Putnam 10 35.8 0.50 1.30 2.48 --29 01125500 Quinebaug River Putnam 50 328 37.3 70.9 91.1 --32 01126000 Fivemile River Killingly 34 57.8 7.66 17.5 22.9 --34 01126500 Moosup River Plainfield 39 83.6 7.96 13.7 19.0 --35 01126600 Blackwell Brook Brooklyn 13 17 0.58 1.29 2.17 --37 01126950 Pachaug River Griswold 12 53 2.12 6.50 13.7 (37) 7/16/68, 7/21–23/1968, 8/13–16/1968, 8/19–20/1968, 

8/22/68, 8/24–25/1968, 8/27/68, 9/14/1968–10/6/1968

38 01127000 Quinebaug River Griswold 87 713 92.2 174 229 --41 01127500 Yantic River Norwich 75 89.3 4.91 9.26 15.4 --50 01184000 Connecticut River Suffield 77 9,660 2,300 3,210 4,070 --51 01184100 Stony Brook Suffield 24 10.4 0.20 0.53 1.22 --53 01184490 Broad Brook East Windsor 39 15.5 5.64 9.30 10.7 --54 01184500 Scantic River East Windsor 43 98.2 18.3 31.7 40.4 --55 01186000 West Branch Farmington River Barkhamsted 50 131 16.6 59.5 79.3 --56 01186100 Mad River Winchester 13 18.5 0.29 0.83 1.70 --58 01186500 Still River Colebrook 55 85 6.41 14.2 22.8 --59 01187000 West Branch Farmington River Barkhamsted 26 217 36.0 60.1 85.5 --60 01187300 Hubbard River Hartland 66 19.9 0.47 1.28 2.35 --61 01187400 Valley Brook Hartland 32 7.03 0.24 0.46 0.73 --63 01187800 Nepaug River New Hartford 52 23.5 0.93 2.84 4.14 --64 01187850 Clear Brook Burlington 55 0.59 0.45 0.76 0.88 --
Table 3 19

Table 3. Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued[Low-flow frequency statistics are based on the climatic year, which begins on April 1 and ends on March 31, and on flow record through March 31, 2003. USGS, U.S. Geological Survey; mi2, square miles; ft3/s, cubic feet per second; --, no data; bold indicates Index Station]

Map reference 

number 

(fig. 1)

USGS 

station 

number

River name Town

Years 

of 

record 

 Drainage area 

(mi2)

Low-flow frequency statistic

7Q10

(ft3/s)

7Q2

(ft3/s)

30Q2

(ft3/s) Number of days and dates of zero flow

65 01187980 Farmington River Avon 15 360 35.8 113 155 --66 01188000 Burlington Brook Burlington 74 4.1 0.57 1.06 1.48 --67 01188090 Farmington River Farmington 28 378 106 172 226 --68 01189000 Pequabuck River Bristol 64 45.8 13.3 18.1 21.4 --70 01189390 East Branch Salmon Brook Granby 13 39.5 6.92 11.0 13.8 --71 01189500 Salmon Brook East Granby 17 67.4 12.7 19.3 23.1 --72 01189995 Farmington River Simsbury 34 577 181 281 394 --73 01190000 Farmington River Windsor 47* 590 235 118 331 --75 01190100 Piper Brook Newington 13 14.6 2.24 4.97 7.78 --76 01190200 Mill Brook Newington 13 2.65 0.39 0.67 0.91 --77 01190300 Trout Brook West Hartford 13 14.6 1.06 3.96 6.08 --78 01190500 South Branch Park River Hartford 45 39.9 10.1 16.4 20.3 --79 01190600 Wash Brook Bloomfield 13 5.54 0.02 0.31 0.70 (14) 10/8–15/1964, 9/28/1965, 10/3–5/1965, 9/5/196880 01191000 North Branch Park River Hartford 50 26.8 0.64 2.46 3.94 --81 01191500 Park River Hartford 25 72.5 17.1 23.2 27.7 --83 01192500 Hockanum River East Hartford 74 73.4 22.7 36.7 46.0 --84 01192600 South Branch Salmon Brook Glastonbury 16 0.94 0.33 0.57 0.64 --80 01191000 North Branch Park River Hartford 50 26.8 0.64 2.46 3.94 --81 01191500 Park River Hartford 25 72.5 17.1 23.2 27.7 --83 01192500 Hockanum River East Hartford 74 73.4 22.7 36.7 46.0 --84 01192600 South Branch Salmon Brook Glastonbury 16 0.94 0.33 0.57 0.64 --85 01192650 Roaring Brook Glastonbury 10 24.3 4.19 5.97 7.14 --86 01192700 Mattabesset River Berlin 10 46.5 15.0 21.1 24.7 --88 01192883 Coginchaug River Middlefield 25 29.8 0.62 2.06 3.74 --89 01192890 Coginchaug River Middlefield 19 34.7 1.70 3.05 5.15 --94 01193500 Salmon River East Hampton 77 100 5.32 10.9 17.5 --96 01193800 Hemlock Valley Brook East Haddam 16 2.62 0.15 0.27 0.44 --97 01194000 Eightmile River East Haddam 29 20.1 0.42 1.37 2.30 --98 01194500 East Branch Eightmile River Lyme 48 22.3 0.44 1.60 2.79 --99 01195000 Menunketesuck River Clinton 24 11.2 0.15 0.75 1.22 (4) 8/30–31/1944, 9/10–11/1944

100 01195100 Indian River Clinton 24 5.68 0.04 0.24 0.46 --103 01195200 Neck River Madison 20 6.55 0.02 0.22 0.52 --104 01195490 Quinnipiac River Southington 18 17.4 4.08 6.71 8.78 --105 01196500 Quinnipiac River Wallingford 75 115 33.6 51.8 62.0 --106 01196580 Muddy River North Haven 11 18 1.07 1.88 2.81 --
20 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 3. Low-flow frequency statistics for 91 streamgaging stations with 10 or more years of record in Connecticut.—Continued [Low-flow frequency statistics are based on the climatic year, which begins on April 1 and ends on March 31, and on flow record through March 31, 2003. USGS, U.S. Geological Survey; mi2, square miles; ft3/s, cubic feet per second; --, no data; bold indicates Index Station] Map ref- erence number (fig. 1) USGS station number River name Town Years of record Drain- age area (mi2

)

Low-flow frequency statistic

7Q10

(ft3/s)

7Q2

(ft3/s)

30Q2

(ft3/s) Number of days and dates of zero flow

108 01196620 Mill River Hamden 29 24.5 1.37 5.34 6.93 --109 01198500 Blackberry River North Canaan 22 45.9 2.99 6.66 9.79 --114 01199000 Housatonic River Salisbury 93 634 110 189 238 --115 01199050 Salmon Creek Salisbury 44 29.4 3.22 6.60 9.05 --116 01199200 Guinea Brook Sharon 21 3.5 0.00 0.16 0.19 (141 total)—(5) 1962, (30) 1964, (38) 1965, (28) 1966, 

(8) 1968, (7) 1970, (1) 1974, (24) 1980

117 01200000 Tenmile River Wingdale, NY 72 203 12.7 27.8 35.8 --118 01200500 Housatonic River New Milford 65 996 158 263 336 --119 01201190 West Aspetuck River New Milford 10 23.8 0.77 1.59 2.54 --120 01201500 Still River New Milford 35 67.5 14.4 20.7 26.0 --122 01201930 Marshepaug River Goshen 14 9.24 0.44 1.27 2.05 --124 01203000 Shepaug River Roxbury 41 132 6.23 11.5 16.5 --126 01203600 Nonewaug River Woodbury 19 17.7 0.65 1.70 2.80 --129 01204000 Pomperaug River Southbury 73 75.1 6.16 11.3 15.7 --130 01204800 Copper Mill Brook Monroe 18 2.45 0.08 0.19 0.35 --131 01205500 Housatonic River Oxford 77 1,544 128 307 479 (1) 10/12/1930132 01205600 West Branch Naugatuck River Torrington 40 33.8 1.33 4.04 6.11 --133 01205700 East Branch Naugatuck River Torrington 41 13.6 1.53 2.40 3.73 --134 01206000 Naugatuck River Thomaston 29 71 15.6 21.8 25.4 --135 01206400 Leadmine Brook Harwinton 13 19.6 0.41 1.15 2.26 --136 01206500 Leadmine Brook Thomaston 29 24.3 0.36 1.18 2.18 --137 01206900 Naugatuck River Thomaston 45 99.8 11.6 18.5 26.5 --138 01208013 Branch Brook Watertown 15 20.8 0.45 2.14 3.88 --139 01208420 Hop Brook Naugatuck 20 16.3 0.44 1.28 2.61 --140 01208500 Naugatuck River Beacon Falls 83 260 61.7 89.1 110 --141 01208873 Rooster River Trumbull 28 10.6 1.00 1.92 3.07 --143 01208925 Mill River Fairfield 33 28.6 1.14 2.67 4.50 (1) 11/1/1979144 01208950 Sasco Brook Fairfield 41 7.38 0.04 0.32 0.76 --145 01208990 Saugatuck River Redding 41 21 0.27 1.27 2.44 --147 01209500 Saugatuck River Westport 35 79.8 2.25 7.81 10.7 --148 01209700 Norwalk River Wilton 43 30 1.60 3.72 5.43 --

* Post-reservoir record 1940–1987.
Table 4 21

Table 4. Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued[USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station]

Map reference 

number 

(fig. 1)

USGS 

station 

number

River name Town

Drainage 

area 

(mi2)

Monthly median flow, in cubic feet per second

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

7 01118300 Pendleton Brook North Stonington 4.02 8.60 9.50 12.0 12.0 8.30 3.70 1.20 0.80 0.76 2.10 5.10 8.50

13 01119500 Willimantic River Mansfield 121 190 207 313 324 220 121 62.0 49.0 46.0 69.0 130 18014 01120000 Hop River Columbia 74.8 100 118 208 176 113 50.0 20.0 14.0 16.0 34.0 77.0 99.016 01120500 Safford Brook Woodstock 4.15 5.20 5.60 11.0 8.95 4.90 1.90 0.68 0.42 0.55 1.40 4.50 6.0019 01121000 Mount Hope River Ashford 28.6 44.0 50.0 77.0 70.0 47.0 20.0 7.70 5.40 5.90 13.0 28.0 42.022 01122000 Natchaug River Windham 174 258 290 461 445 290 138 68.0 49.0 48.0 81.0 176 24323 01122500 Shetucket River Windham 404 620 700 1,090 1,060 704 344 173 132 130 216 426 59124 01123000 Little River Canterbury 30 50.0 57.0 80.0 77.0 53.0 27.0 14.0 11.0 10.0 16.0 33.0 49.525 01124000 Quinebaug River Thompson 155 250 264 425 446 266 134 68.0 52.0 50.0 93.0 164 23826 01124151 Quinebaug River Thompson 172 242 268 440 507 299 168 77.0 50.0 50.0 107 159 27828 01125490 Little River Putnam 35.8 37.0 42.0 100 80.0 41.5 21.0 6.60 3.90 4.70 8.70 25.0 30.029 01125500 Quinebaug River Putnam 328 487 523 915 925 532 301 158 126 120 159 313 41432 01126000 Fivemile River Killingly 57.8 91.0 114 170 151 107 63.0 36.0 32.0 33.0 36.0 58.0 83.034 01126500 Moosup River Plainfield 83.6 150 170 265 224 151 81.0 36.0 26.0 25.0 40.0 95.0 13935 01126600 Blackwell Brook Brooklyn 17 27.0 31.0 46.0 40.5 28.0 11.0 4.40 3.00 3.20 5.50 15.0 30.037 01126950 Pachaug River Griswold 53 96.0 109 160 144 104 63.0 20.0 15.0 26.0 38.5 54.5 82.038 01127000 Quinebaug River Griswold 713 1,220 1,350 2,090 2,050 1,340 715 398 339 325 444 764 1,14041 01127500 Yantic River Norwich 89.3 144 168 246 218 138 61.0 24.0 20.0 23.0 43.0 94.0 13250 01184000 Connecticut River Suffield 9,660 12,200 12,400 20,100 38,350 20,600 12,350 7,470 6,220 6,060 8,970 14,600 15,30051 01184100 Stony Brook Suffield 10.4 12.0 16.0 25.5 23.0 13.0 5.90 2.70 1.70 1.90 5.55 11.0 13.053 01184490 Broad Brook East Windsor 15.5 21.0 24.0 33.0 32.0 25.0 19.0 14.0 13.0 12.0 13.0 16.0 20.054 01184500 Scantic River East Windsor 98.2 119 125 220 204 141 89.0 59.0 47.0 47.0 55.0 82.0 10155 01186000 West Branch Farmington River Barkhamsted 131 194 175 209 308 230 224 198 232 118 139 225 21656 01186100 Mad River Winchester 18.5 14.0 15.0 32.0 56.5 21.0 7.90 3.20 2.70 2.30 3.60 8.85 15.058 01186500 Still River Colebrook 85 120 130 215 260 145 70.0 35.0 30.0 39.0 67.0 114 13059 01187000 West Branch Farmington River Barkhamsted 217 312 290 532 688 374 196 116 99 116 133 222 28060 01187300 Hubbard River Hartland 19.9 22.0 24.0 49.0 61.0 31.0 12.0 4.60 3.00 3.60 8.60 25.0 28.061 01187400 Valley Brook Hartland 7.03 8.00 8.50 19.0 25.0 14.0 6.00 2.20 1.00 0.90 1.80 7.10 9.5063 01187800 Nepaug River New Hartford 23.5 27.0 28.0 62.0 58.5 37.0 18.0 7.60 5.50 6.00 8.60 20.0 26.064 01187850 Clear Brook Burlington 0.59 1.20 1.30 1.80 2.20 2.20 1.90 1.60 1.40 1.20 1.10 1.10 1.1065 01187980 Farmington River Avon 360 386 490 797 956 667 358 299 308 317 354 388 51166 01188000 Burlington Brook Burlington 4.1 5.50 6.20 11.0 11.0 7.40 3.90 2.30 1.80 1.70 2.60 5.00 6.0067 01188090 Farmington River Farmington 378 500 526 769 971 579 450 340 382 373 377 517 52068 01189000 Pequabuck River Bristol 45.8 60.0 68.0 102 106 76.0 43.0 30.0 25.5 24.0 27.0 44.0 59.070 01189390 East Branch Salmon Brook Granby 39.5 53.0 64.0 99.0 97.5 67.0 36.0 21.0 18.0 17.0 18.0 35.0 59.0
22 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 4. Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued [USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station] Map ref- erence number (fig. 1) USGS station number River name Town Drain- age area (mi2

)

Monthly median flow, in cubic feet per second

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

71 01189500 Salmon Brook East Granby 67.4 85.0 91.5 178 213 121 64.0 41.0 29.0 27.0 32.0 65.0 78.072 01189995 Farmington River Simsbury 577 940 951 1,470 1,720 1,140 732 545 588 575 630 775 98173 01190000 Farmington River Windsor 590 752 848 1,450 1,730 1,030 664 425 418 432 450 646 76675 01190100 Piper Brook Newington 14.6 12.0 24.0 34.0 27.0 13.0 11.0 8.00 8.00 8.00 9.30 15.0 16.076 01190200 Mill Brook Newington 2.65 2.00 2.40 3.80 2.85 2.10 1.40 1.10 1.10 1.20 1.40 2.30 2.0077 01190300 Trout Brook West Hartford 14.6 18.0 20.0 35.0 27.0 17.0 10.5 8.20 7.20 6.80 8.70 16.0 15.078 01190500 South Branch Park River Hartford 39.9 53.0 65.0 95.0 76.0 53.0 35.0 27.0 23.0 24.0 27.0 42.0 55.079 01190600 Wash Brook Bloomfield 5.54 4.00 5.10 12.0 7.20 4.30 2.20 1.40 0.90 0.82 1.60 4.10 3.8080 01191000 North Branch Park River Hartford 26.8 19.0 25.0 44.0 31.0 19.0 9.90 6.30 5.00 4.60 6.40 14.0 20.081 01191500 Park River Hartford 72.5 81.0 108 168 129 86.0 51.0 39.0 32.0 32.0 37.0 66.5 90.083 01192500 Hockanum River East Hartford 73.4 101 116 164 165 125 85.0 63.0 58.0 52.0 58.0 72.0 91.084 01192600 South Branch Salmon Brook Glastonbury 0.94 1.10 1.30 2.30 2.40 2.00 1.50 1.10 0.90 0.80 0.75 0.88 1.1085 01192650 Roaring Brook Glastonbury 24.3 25.0 34.0 63.0 53.0 38.0 18.0 10.0 8.00 7.70 11.0 16.0 21.086 01192700 Mattabesset River Berlin 46.5 50.0 64.0 117 78.0 53.0 37.0 27.0 28.0 28.0 32.0 47.0 48.088 01192883 Coginchaug River Middlefield 29.8 52.0 63.0 70.0 71.0 39.0 20.0 8.50 7.00 7.00 19.0 39.0 56.089 01192890 Coginchaug River Middlefield 34.7 57.0 58.0 99.0 68.0 50.0 19.0 8.20 6.90 8.80 13.0 33.0 61.094 01193500 Salmon River East Hampton 100 165 185 280 262 179 80.5 35.0 24.0 24.0 43.0 101 15496 01193800 Hemlock Valley Brook East Haddam 2.62 5.20 6.00 8.00 6.90 5.80 2.40 0.87 0.50 0.55 1.20 2.60 4.5597 01194000 Eightmile River East Haddam 20.1 35.0 47.0 61.0 52.0 36.0 14.0 5.60 3.60 3.00 5.60 21.0 32.098 01194500 East Branch Eightmile River Lyme 22.3 41.0 49.0 70.0 59.0 44.0 18.0 6.45 4.40 4.60 9.00 27.0 43.099 01195000 Menunketesuck River Clinton 11.2 19.0 24.0 37.0 27.0 22.0 6.40 2.80 2.20 1.80 2.30 11.0 18.0

100 01195100 Indian River Clinton 5.68 9.35 11.0 12.0 14.0 8.00 3.20 0.87 0.76 0.75 1.80 5.90 9.20103 01195200 Neck River Madison 6.55 10.0 11.0 18.5 15.0 11.5 4.10 1.40 0.83 0.82 2.20 5.10 9.80104 01195490 Quinnipiac River Southington 17.4 27.0 28.0 35.0 39.0 30.0 20.0 14.0 12.0 11.0 14.0 22.0 25.0105 01196500 Quinnipiac River Wallingford 115 182 209 289 277 204 130 93.0 79.0 76.0 86.0 135 175106 01196580 Muddy River North Haven 18 20.0 30.0 43.0 31.0 23.0 9.50 5.30 4.00 3.60 4.90 11.0 18.0108 01196620 Mill River Hamden 24.5 38.0 44.0 57.0 63.0 44.0 24.0 12.0 9.00 8.30 12.0 23.5 37.0109 01198500 Blackberry River North Canaan 45.9 43.0 47.0 87.0 136 66.0 31.0 15.0 12.0 13.0 16.0 44.0 53.0114 01199000 Housatonic River Salisbury 634 812 830 1,550 1,990 1,180 632 386 315 305 400 710 870115 01199050 Salmon Creek Salisbury 29.4 34.0 40.0 67.0 72.0 45.0 26.0 15.0 12.0 13.0 20.0 34.0 41.0116 01199200 Guinea Brook Sharon 3.5 4.40 5.20 11.0 10.0 6.70 2.30 0.69 0.40 0.29 1.10 4.20 6.10117 01200000 Tenmile River Wingdale, NY 132 250 271 487 490 294 154 82.0 53.0 46.0 64.0 164 260118 01200500 Housatonic River New Milford 996 1,300 1,440 2,510 2,860 1,830 1,020 590 440 414 576 1,080 1,410119 01201190 West Aspetuck River New Milford 23.8 97.0 108 175 149 102 57.0 40.0 32.0 30.5 38.0 72.0 87.0120 01201500 Still River New Milford 67.5 25.0 34.0 66.0 56.0 35.0 16.5 7.10 3.80 3.80 5.70 18.0 30.0
Table 4 23

Table 4. Monthly median streamflows for 91 stations with 10 or more years of record in Connecticut.—Continued[USGS, U.S. Geological Survey; mi2, square miles; bold indicates Index Station]

Map reference 

number 

(fig. 1)

USGS 

station 

number

River name Town

Drainage 

area 

(mi2)

Monthly median flow, in cubic feet per second

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

122 01201930 Marshepaug River Goshen 9.24 15.0 15.0 26.0 28.0 14.0 7.25 4.10 3.00 5.20 10.0 21.0 25.0124 01203000 Shepaug River Roxbury 132 185 196 369 404 230 103 42.0 23.0 26.5 36 100 169126 01203600 Nonewaug River Woodbury 17.7 25.0 25.0 43.0 36.0 22.0 9.00 4.70 3.80 4.20 5.40 15.0 27.0129 01204000 Pomperaug River Southbury 75.1 105 115 188 176 114 56.0 29.0 22.0 20.0 34.0 75.0 112130 01204800 Copper Mill Brook Monroe 2.45 4.00 4.60 6.90 6.10 4.00 1.60 0.64 0.50 0.47 0.90 2.70 3.90131 01205500 Housatonic River Oxford 1,544 2,350 2,420 4,030 4,480 2,890 1,620 920 684 646 892 1,720 2,360132 01205600 West Brook Naugatuck River Torrington 33.8 37.0 41.0 76.0 94.5 48.0 21.0 11.0 8.40 8.70 14.0 35.0 45.0133 01205700 East Branch Naugatuck River Torrington 13.6 17.0 19.0 33.0 38.0 20.0 9.60 5.60 5.10 4.70 8.10 16.0 22.0134 01206000 Naugatuck River Thomaston 71 100 100 199 212 123 60.0 36.0 30.0 29.0 32.0 61.0 96.0135 01206400 Leadmine Brook Harwinton 19.6 27.0 28.0 65.0 51.0 32.0 16.0 5.90 3.30 3.95 11.0 28.0 29.0136 01206500 Leadmine Brook Thomaston 24.3 34.0 35.0 70.0 66.0 41.0 16.0 5.30 3.10 4.10 8.00 23.5 33.0137 01206900 Naugatuck River Thomaston 99.8 145 152 260 262 159 75.0 42.0 34.0 35.5 59.0 120 159138 01208013 Branch Brook Watertown 20.8 22.0 23.5 42.0 35.0 23.0 12.0 8.50 6.70 7.20 16.0 20.0 28.0139 01208420 Hop Brook Naugatuck 16.3 25.5 30.0 37.0 37.0 27.0 12.0 6.00 4.75 4.70 9.30 19.0 28.0140 01208500 Naugatuck River Beacon Falls 260 395 423 731 730 476 243 151 132 132 165 310 410141 01208873 Rooster River Trumbull 10.6 12.0 12.0 14.0 16.0 12.0 7.50 4.40 4.10 3.90 4.70 9.00 12.0143 01208925 Mill River Fairfield 28.6 29.0 34.0 46.0 52.5 32.0 15.0 7.70 6.90 6.60 11.0 17.0 27.0144 01208950 Sasco Brook Fairfield 7.38 11.0 13.0 17.0 16.0 11.0 4.60 1.60 1.30 1.45 3.40 7.90 12.0145 01208990 Saugatuck River Redding 21 36.0 40.0 54.0 51.0 34.0 15.0 6.70 4.40 3.70 9.80 25.0 41.0147 01209500 Saugatuck River Westport 79.8 100 102 230 188 107 31.0 16.0 12.0 13.0 18.0 43.0 75.0148 01209700 Norwalk River Wilton 30 45.0 53.0 77.0 73.0 46.0 21.0 11.0 9.00 7.20 13.0 31.0 49.0
24 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

Table 5. Descriptions of short-term stations in Connecticut used in correlation of daily mean base flows to estimate low-flow 

statistics.

[USGS, U.S. Geological Survey; mi2, square miles]

Map 

reference 

number 

(fig. 2)

USGS 

station 

number

Latitude 

(decimal 

degrees)

Longitude 

(decimal 

degrees)

River name Location Period of 

record

Number 

of days 

with daily 

mean 

flow data

Drainage 

area 

(mi2)

11 01119320 41.9343 -72.2609 Roaring Brook Near Stafford Springs, CT 1961–1966 1,887 14.6

57 01186400 41.9784 -73.0451 Sandy Brook State Highway 8 at 

Robertsville, CT

1967–1976 3,292 34.9

62 01187680 41.8723 -72.9062 Cherry Brook Near Canton Center, CT 1966–1971 1,826 8.23

69 01189180 41.8745 -72.8612 Hop Brook West Simsbury, CT 1966–1971 1,826 1.38

74 01190055 41.8215 -72.5881 Podunk River Near South Windsor, CT 1975–1979 1,422 11.9

101 01195117 41.3854 -72.6126 Hammonasset River Near Madison, CT 1974–1977 1,240 18.1

102 01195146 41.3826 -72.5890 Pond Meadow Brook Near Killingworth, CT 1984–1993 3,287 5.92

111 01198800 41.9487 -73.3212 Hollenbeck River Huntsville, CT 1970–1974 1,461 18.1

112 01198860 41.9645 -73.3015 Deming Brook Near Huntsville, CT 1970–1975 1,602 1.08

113 01198870 41.9673 -73.3068 Ledgy Brook Near Huntsville, CT 1970–1974 1,461 0.66

128 01203805 41.5576 -73.2151 Weekeepeemee River Hotchkissville, CT 1978–1979,

2000–2005

1,495 26.8

146 01208999 41.2932 -73.3676 Little River Sanfordtown, CT 1965–1968 1,310 5.5
Table 6 25

Table 6. Descriptions of partial-record sites in Connecticut used in correlation of daily mean base flows to estimate flow duration, 

low-flow frequency, and August median statistics.

[USGS, U.S. Geological Survey; mi2, square miles]

Map 

reference 

number 

(fig. 2)

USGS 

station 

number

Latitude 

(decimal 

degrees)

Longitude 

(decimal 

degrees)

River name Location Period of record

Number 

of baseflow 

measurements

Drainage 

area 

(mi2)

8 01118350 41.4548 -71.8140 Green Fall River Clarks Falls, CT 1960–1973 24 19.8

9 01118750 41.3890 -71.9859 Haleys Brook Near Old Mystic, CT 1962–1978 33 4.37

10 01119255 42.0232 -72.2476 Delphi Brook Near Staffordville, CT 1962–1975 29 2.59

12 01119360 41.8715 -72.2915 Conat Brook Willington, CT 1963–1978 30 2.40

15 01120200 41.7070 -72.2473 Tenmile River Near Willimantic, CT 1962–1973 23 16.3

17 01120700 41.8793 -72.0998 Bigelow Brook Phoenixville, CT 1960–1973 18 22.0

18 01120920 41.9201 -72.1792 Mount Hope River Westford, CT 1962–1973 21 3.16

20 01121300 41.8723 -72.2415 Fenton River East Willington, CT 1960–1975 32 11.4

21 01121350 41.8145 -72.2254 Fenton River Gurleyville, CT 1962–1973 20 24.0

27 01125300 41.9909 -71.9970 English Neighborhood 

Brook

Near Woodstock, CT 1961–1978 36 4.66

30 01125600 41.8743 -72.0092 Mashamoquet Brook Abington, CT 1961–1975 39 11.1

31 01125900 41.9090 -71.8192 Cady Brook East Putnam, CT 1961–1979 28 8.29

36 01126700 41.4050 -71.5842 Kitt Brook Near Canterbury, CT 1961–1975 24 11.1

39 01127100 41.5540 -71.9704 Broad Brook Near Preston City, CT 1960–1965,

1967–1975

20 12.5

40 01127400 41.5709 -72.1331 Susquetonscut Brook Yantic, CT 1960–1975 30 15.7

42 01127700 41.5009 -72.1159 Trading Cove Brook Near Thamesville, CT 1960–1973 29 8.46

43 01127790 41.2200 -72.1218 Latmier Brook East Lyme, CT 1962–1973 15 18.5

44 01127800 41.3570 -72.2606 Fourmile River Near East Lyme, CT 1960–1979 38 4.30

49 01183990 42.0068 -72.5534 Jawbuck Brook Near Hazardville, CT 1963–1976 24 2.16

52 01184300 41.9918 -72.4343 Gillette Brook Somers, CT 1960–1980 56 3.64

82 01191900 41.9062 -72.4037 Charter Brook Near Crystal Lake, CT 1960–1978 35 8.51

87 01192800 41.4523 -72.7018 Parmalee Brook Near Durham, CT 1960–1978 28 2.79

90 01193120 41.4793 -72.5573 Ponset Brook Near Higganum, CT 1962–1977 28 5.72

91 01193130 41.4740 -72.5965 Candlewood Hill Brook Near Higganum, CT 1960–1973 24 3.84

92 01193210 41.6395 -72.3426 Raymond Brook Near Amston, CT 1960–1964,

1967–1973

19 3.52

93 01193300 41.6962 -72.4556 Blackledge River Near Gilead, CT 1960–1975, 1978 27 6.75

95 01193600 41.5551 -72.4523 Flat Brook Near East Hampton, CT 1960–1964,

1967–1973

21 2.31

107 01196600 41.4598 -72.9179 Willow Brook Near Cheshire, CT 1986–2005 73 9.34

110 01198700 41.5535 -73.1649 Brown Brook Lower City, CT 1960–1968 24 5.56

121 01201890 41.4562 -73.3348 Pond Brook Near Hawleyville, CT 1962–1975 28 11.9

123 01202700 41.7432 -73.2201 Butternut Brook Near Litchfield, CT 1960–1979 37 2.42

125 01203100 41.5276 -73.3085 Jacks Brook Near Roxbury Falls, CT 1960–1975, 1978 34 7.90

127 01203700 41.6273 -73.2257 Wood Creek Near Bethlehem, CT 1960–1966,

1968–1979

31 3.39

142 01208900 41.2879 -73.2921 Patterson Brook Near Easton, CT 1960–1978 33 1.21
26 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 7. Basin characteristics for the index stations, short-term stations, and partial-record sites.—Continued [Geologic characteristics for basins in Connecticut derived from Stone and others (1992) and geologic characteristics for basins outside of Connecticut derived from Soller and Parkard (1998). Station type, I (RI), index station in Rhode Island; I (CT), index station in Connecticut; I (MA), index station in Massachusetts; P, partial-record site; S, short-term station; USGS, U.S. Geological Survey; mi2, square miles; ft, feet; bold indicates Index Station] Map refer- ence number (fig. 2) USGS station number Station type River name Drain- age area (mi2

)

DEM 

drainage 

area 

(mi2

)

Glacial 

till 

(percent)

Thick 

glacial 

till1

(percent)

Coarse 

deposits 

(sand 

and 

gravel) 

(percent)

Fines 

(percent)

Alluvium 

(percent)

Fines 

overlying 

sand and 

gravel 

(percent)

Water 

(percent)

Swamp 

(percent)

Mean 

basin 

elevation 

(ft)

Minimum basin 

elevation 

(ft)

Maximum 

basin 

elevation 

(ft)

1 01111300 I (RI) Nipmuc River 16.3 16.32 88.4 0.0 11.6 0.0 0.0 0.0 0.0 0.0 532 344 7702 01115100 I (RI) Branch River 2.8 2.80 74.4 0.0 25.6 0.0 0.0 0.0 0.0 0.0 493 356 7043 01115630 I (RI) Nooseneck River 8.39 8.39 57.3 0.0 42.7 0.0 0.0 0.0 0.0 0.0 454 283 6354 01115770 I (RI) Carr River 7.3 7.30 48.1 0.0 51.9 0.0 0.0 0.0 0.0 0.0 327 254 4925 01117468 I (RI) Beaver River 9.78 9.78 73.2 0.0 26.8 0.0 0.0 0.0 0.0 0.0 314 114 5636 01117800 I (RI) Wood River 35.3 35.31 59.8 6.0 30.9 0.0 0.0 0.0 0.4 2.9 389 123 6837 01118300 I (CT) Pendleton Brook 4.02 4.00 81.3 1.5 10.9 0.0 1.5 0.0 0.0 4.8 339 156 5308 01118350 P Green Fall River 19.8 19.25 79.6 4.6 10.7 0.0 0.5 0.0 1.5 3.2 271 69 5279 01118750 P Haleys Brook 4.37 4.41 77.8 8.9 8.9 0.0 1.2 0.0 0.0 3.3 239 96 350

10 01119255 P Delphi Brook 2.59 2.57 88.2 11.8 0.0 0.0 0.0 0.0 0.0 0.0 1,005 771 1,20411 01119320 S Roaring Brook 14.6 15.13 93.0 1.6 0.0 0.0 1.6 0.0 2.0 1.6 908 596 1,30412 01119360 P Conat Brook 2.40 2.13 78.5 2.2 17.0 0.0 0.0 0.0 0.0 2.2 652 510 95515 01120200 P Tenmile River 16.3 16.29 79.0 11.3 3.8 0.6 1.8 0.0 0.9 2.6 493 242 72716 01120500 I (CT) Safford Brook 4.15 4.17 46.9 53.1 0.0 0.0 0.0 0.0 0.0 0.0 747 535 93417 01120700 P Bigelow Brook 22.0 26.90 82.4 5.2 6.0 0.0 2.5 0.0 3.0 0.9 799 447 1,29418 01120920 P Mount Hope River 3.16 3.44 71.3 12.2 5.4 0.0 0.0 0.0 8.2 2.8 914 672 1,25319 01121000 I (CT) Mount Hope River 28.6 29.00 77.8 14.9 3.4 0.0 0.7 0.0 1.7 1.5 617 320 96520 01121300 P Fenton River 11.4 10.93 82.9 9.4 3.8 0.0 0.7 0.0 1.4 1.7 768 440 1,20421 01121350 P Fenton River 24.0 24.24 80.9 9.1 6.6 0.0 1.0 0.0 0.6 1.9 566 274 95824 01123000 I (CT) Little River 30.0 30.06 71.8 6.4 15.8 0.0 2.3 0.0 1.6 2.1 508 236 79327 01125300 P English Neighborhood Brook 4.66 4.46 57.6 35.9 1.1 0.0 0.0 0.0 1.1 4.2 674 385 87928 01125490 I (CT) Little River 35.8 36.11 52.9 28.5 12.3 0.0 2.1 1.2 1.6 1.4 528 270 93930 01125600 P Mashamoquet Brook 11.1 11.02 59.3 28.5 8.2 0.0 0.5 0.0 0.9 2.6 686 483 88931 01125900 P Cady Brook 8.29 8.29 92.6 1.0 6.3 0.0 0.0 0.0 0.1 0.0 647 419 83633 01126200 I (RI) Bucks Horn Brook 4.22 4.22 70.8 0.0 29.2 0.0 0.0 0.0 0.0 0.0 494 412 62735 01126600 I (CT) Blackwell Brook 17.0 17.11 61.6 26.1 4.7 1.5 0.0 2.5 0.0 3.6 478 141 77136 01126700 P Kitt Brook 11.1 10.66 50.6 24.0 21.3 0.0 0.0 0.0 0.5 3.6 389 173 66237 01126950 I (CT) Pachaug River 53.0 52.92 50.7 12.1 23.5 0.8 0.1 1.9 5.8 5.0 343 151 65339 01127100 P Broad Brook 12.5 12.30 70.0 13.4 13.8 0.0 0.0 0.0 0.0 2.7 290 117 53340 01127400 P Susquetonscut Brook 15.7 15.27 60.8 18.0 15.1 0.0 1.6 0.0 0.0 4.4 368 113 671
Table 7 27

Table 7. Basin characteristics for the index stations, short-term stations, and partial-record sites.—Continued[Geologic characteristics for basins in Connecticut derived from Stone and others (1992) and geologic characteristics for basins outside of Connecticut derived from Soller and Parkard (1998). Station type, I (RI), index station in Rhode Island; I (CT), index station in Connecticut; I (MA), index station in Massachusetts; P, partial-record site; S, short-term station; USGS, U.S. Geological Survey; mi2, square miles; ft, feet; bold indicates Index Station]

Map 

reference 

number 

(fig. 2)

USGS 

station 

number

Station 

type River name

Drainage 

area 

(mi2)

DEM 

drainage 

area 

(mi2)

Glacial 

till 

(percent)

Thick 

glacial 

till1

(percent)

Coarse 

deposits 

(sand 

and 

gravel) 

(percent)

Fines 

(percent)

Alluvium 

(percent)

Fines 

overlying 

sand and 

gravel 

(percent)

Water 

(percent)

Swamp 

(percent)

Mean 

basin 

elevation 

(ft)

Minimum basin 

elevation 

(ft)

Maximum 

basin 

elevation 

(ft)

42 01127700 P Trading Cove Brook 8.46 8.91 77.2 5.7 9.8 0.0 0.6 2.2 1.1 3.3 295 49 51843 01127790 P Latimer Brook 18.5 17.43 75.1 6.5 12.7 0.0 1.7 0.0 3.0 1.1 278 27 60544 01127800 P Fourmile River 4.30 4.38 82.6 8.7 7.6 0.0 0.0 0.0 0.0 1.1 216 79 42745 01171800 I (MA) Bassett Brook 5.68 5.68 66.7 0.0 33.3 0.0 0.0 0.0 0.0 0.0 407 208 82646 01175670 I (MA) Sevenmile River 9.25 9.25 97.2 0.0 2.8 0.0 0.0 0.0 0.0 0.0 872 649 1,09347 01180000 I (MA) Skyes Brook 1.39 1.39 100.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1,074 637 1,33448 01181000 I (MA) West Branch Westfield River 94.0 93.99 97.9 0.0 2.1 0.0 0.0 0.0 0.0 0.0 1,424 393 2,23249 01183990 P Jawbuck Brook 2.16 2.04 0.0 0.0 0.0 0.0 4.9 95.1 0.0 0.0 193 136 23652 01184300 P Gillette Brook 3.64 3.66 79.5 8.1 6.7 0.0 1.4 0.0 1.4 2.8 676 279 1,11457 01186400 S Sandy Brook 34.9 35.56 89.7 4.3 1.6 0.0 1.2 0.0 1.0 2.2 1,360 569 3,13460 01187300 I (CT) Hubbard River 19.9 20.66 100.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1,286 595 1,64461 01187400 I (CT) Valley Brook 7.03 7.39 99.9 0.0 0.1 0.0 0.0 0.0 0.0 0.0 1,099 544 1,49062 01187680 S Cherry Brook 8.23 8.14 80.8 15.3 0.0 0.0 3.9 0.0 0.0 0.0 896 441 1,20963 01187800 I (CT) Nepaug River 23.5 23.77 67.0 18.6 6.8 0.0 5.2 0.0 0.5 1.8 843 509 1,18764 01187850 I (CT) Clear Brook 0.59 0.56 55.4 0.0 44.6 0.0 0.0 0.0 0.0 0.0 733 531 93066 01188000 I (CT) Burlington Brook 4.10 3.99 31.1 40.6 25.2 0.0 3.0 0.0 0.0 0.0 925 736 1,17069 01189180 S Hop Brook 1.38 1.41 91.9 0.0 8.1 0.0 0.0 0.0 0.0 0.0 699 328 99974 01190055 S Podunk River 11.9 11.88 24.4 10.1 39.6 20.3 2.5 1.6 0.5 1.0 169 44 42482 01191900 P Charter Brook 8.51 8.47 75.0 13.9 7.8 0.0 1.6 0.0 0.0 1.6 722 544 1,05084 01192600 I (CT) South Branch Salmon Brook 0.94 0.95 35.2 0.0 64.8 0.0 0.0 0.0 0.0 0.0 457 239 75387 01192800 P Parmalee Brook 2.79 2.90 84.2 3.3 6.3 0.0 6.3 0.0 0.0 0.0 396 208 73390 01193120 P Ponset Brook 5.72 5.63 68.7 9.0 15.7 0.0 0.0 5.7 0.0 0.9 490 141 68191 01193130 P Candlewood Hill Brook 3.84 3.71 88.4 6.5 5.1 0.0 0.0 0.0 0.0 0.0 480 204 72392 01193210 P Raymond Brook 3.52 3.66 72.8 23.2 0.0 0.0 1.3 0.0 1.3 1.3 582 389 78393 01193300 P Blackledge River 6.75 6.78 78.8 14.1 5.6 0.0 0.0 0.0 0.7 0.7 657 476 89794 01193500 I (CT) Salmon Brook 100 101.64 75.0 10.9 7.8 0.1 2.1 0.8 1.3 1.9 472 61 89795 01193600 P Flat Brook 2.31 2.43 81.5 18.5 0.0 0.0 0.0 0.0 0.0 0.0 402 103 61296 01193800 I (CT) Hemlock Valley Brook 2.62 2.79 78.9 11.7 7.2 0.0 2.3 0.0 0.0 0.0 353 73 62897 01194000 I (CT) Eightmile River 20.1 20.20 88.2 0.6 7.1 0.0 1.0 0.0 1.9 1.3 407 38 63898 01194500 I (CT) East Branch Eightmile River 22.3 22.45 82.8 7.1 6.5 0.0 2.2 0.0 1.1 0.3 365 71 644
28 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 7. Basin characteristics for the index stations, short-term stations, and partial-record sites.—Continued [Geologic characteristics for basins in Connecticut derived from Stone and others (1992) and geologic characteristics for basins outside of Connecticut derived from Soller and Parkard (1998). Station type, I (RI), index station in Rhode Island; I (CT), index station in Connecticut; I (MA), index station in Massachusetts; P, partial-record site; S, short-term station; USGS, U.S. Geological Survey; mi2, square miles; ft, feet; bold indicates Index Station] Map refer- ence number (fig. 2) USGS station number Station type River name Drain- age area (mi2

)

DEM 

drainage 

area 

(mi2

)

Glacial 

till 

(percent)

Thick 

glacial 

till1

(percent)

Coarse 

deposits 

(sand 

and 

gravel) 

(percent)

Fines 

(percent)

Alluvium 

(percent)

Fines 

overlying 

sand and 

gravel 

(percent)

Water 

(percent)

Swamp 

(percent)

Mean 

basin 

elevation 

(ft)

Minimum basin 

elevation 

(ft)

Maximum 

basin 

elevation 

(ft)

100 01195100 I (CT) Indian River 5.68 5.73 77.9 11.2 8.7 0.0 0.0 0.0 0.0 2.1 236 47 495101 01195117 S Hammonasset River 18.1 18.30 86.2 1.4 8.1 0.0 0.0 0.0 0.3 4.0 427 248 715102 01195146 S Pond Meadow Brook 5.92 6.24 73.6 15.2 7.0 0.0 0.0 0.0 1.0 3.1 488 308 662103 01195200 I (CT) Neck River 6.55 6.59 64.8 10.8 21.6 0.0 1.0 0.0 0.0 1.9 167 5 420107 01196600 P Willow Brook 9.34 9.40 57.8 0.0 38.7 0.0 0.0 0.0 0.0 3.5 346 113 873110 01198700 P Brown Brook 5.56 5.55 93.0 0.0 2.6 0.0 0.0 0.0 1.8 2.6 1,412 771 1,746111 01198800 S Hollenbeck River 18.1 19.02 86.7 3.6 3.9 0.0 3.6 0.0 0.6 1.6 1,188 658 1,747112 01198860 S Deming Brook 1.08 1.10 100.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1,498 797 1,960113 01198870 S Ledgy Brook 0.66 0.70 100.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1,494 773 1,949116 01199200 I (CT) Guinea Brook 3.5 3.48 96.5 0.0 1.8 0.0 0.0 0.0 0.0 1.8 1,292 1,141 1,550119 01201190 I (CT) West Aspetuck River 23.8 23.85 81.1 7.6 2.6 3.6 1.6 0.0 1.6 1.8 786 268 1,417121 01201890 P Pond Brook 11.9 11.86 64.6 19.9 9.5 0.0 2.0 0.0 2.0 2.0 513 248 825122 01201930 I (CT) Marshepaug River 9.24 9.50 56.1 28.1 0.6 0.0 2.0 0.0 9.9 3.3 1,337 1,085 1,634123 01202700 P Butternut Brook 2.42 2.43 55.9 37.8 2.1 0.0 4.2 0.0 0.0 0.0 1,122 914 1,290125 01203100 P Jacks Brook 7.90 7.82 75.0 18.2 3.7 0.0 0.6 0.0 0.0 2.4 686 291 1,044127 01203700 P Wood Creek 3.39 3.40 71.2 20.5 2.9 0.0 1.4 0.0 0.0 4.0 905 559 1,133128 01203805 S Weekeepeemee River 26.8 27.06 81.2 12.0 3.2 0.0 2.7 0.0 0.2 0.7 741 236 1,138130 01204800 I (CT) Copper Mill Brook 2.45 2.45 41.0 41.0 13.0 0.0 0.0 0.0 0.0 5.0 490 336 663135 01206400 I (CT) Leadmine Brook 19.6 19.76 57.9 33.5 4.0 0.0 1.0 0.0 0.9 2.7 900 535 1,187135 01206500 I (CT) Leadmine Brook 24.3 24.44 61.2 30.2 4.5 0.0 0.5 0.0 1.3 2.3 760 492 1,105142 01208900 P Patterson Brook 1.21 1.20 72.6 8.1 4.0 0.0 0.0 0.0 0.0 15.3 430 358 528144 01208950 I (CT) Sasco Brook 7.38 7.43 59.7 37.9 1.6 0.0 0.8 0.0 0.0 0.0 230 60 398145 01208990 I (CT) Saugatuck River 21.0 20.67 79.0 4.2 10.5 0.0 1.2 0.0 1.2 3.9 574 298 1,002146 01208999 S Little River 5.5 5.52 73.3 23.4 2.2 0.0 0.0 0.0 1.1 0.0 632 376 851

1 Thick glacial till is defined as greater than 10-ft thick.
Table 8 29

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Low-flow partial-record stations—Continued

01121300 (20) 01118300 (7) 29 0.90

01120500 (16) 29 0.90

01121000 (19) 29 0.97

01123000 (24) 29 0.93

01121350 (21) 01118300 (7) 20 0.70

01120500 (16) 20 0.75

01121000 (19) 20 0.78

01123000 (24) 20 0.80

01193800 (96) 20 0.75

01194500 (98) 20 0.73

01125300 (27) 01120500 (16) 29 0.92

01121000 (19) 29 0.92

01123000 (24) 29 0.85

01187800 (63) 29 0.90

01195200 (103) 29 0.86

01125600 (30) 01120500 (16) 26 0.94

01121000 (19) 26 0.95

01123000 (24) 26 0.91

01194500 (98) 26 0.91

01195200 (103) 26 0.90

01125900 (31) 01118300 (7) 20 0.86

01120500 (16) 20 0.89

01121000 (19) 20 0.89

01123000 (24) 20 0.76

01111300 (1) 15 0.84

01126700 (36) 01118300 (7) 22 0.92

01120500 (16) 22 0.86

01121000 (19) 22 0.97

01123000 (24) 22 0.96

01194500 (98) 22 0.97

01115630 (3) 15 0.96

01115770 (4) 15 0.92

01117800 (6) 15 0.96

01127100 (39) 01115630 (3) 12 0.97

01115770 (4) 12 0.90

01118300 (7) 19 0.91

01120500 (16) 19 0.84

01121000 (19) 19 0.87

01123000 (24) 19 0.79

01194500 (98) 19 0.88

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Low-flow partial-record stations

01118350 (8) 01118300 (7) 24 0.91

01120500 (16) 24 0.90

01121000 (19) 24 0.87

01123000 (24) 24 0.88

01115630 (3) 16 0.87

01115770 (4) 16 0.87

01117800 (6) 16 0.91

01118750 (9) 01118300 (7) 22 0.95

01123000 (24) 22 0.73

01194500 (98) 22 0.72

01115630 (3) 16 0.66

01115770 (4) 16 0.57

01119255 (10) 01118300 (7) 23 0.82

01120500 (16) 23 0.90

01121000 (19) 23 0.94

01126600 (35) 20 0.90

01192600 (84) 23 0.58

01193800 (96) 23 0.92

01171800 (45) 20 0.91

01119360 (12) 01118300 (7) 24 0.73

01120500 (16) 24 0.75

01188000 (66) 24 0.77

01192600 (84) 24 0.54

01193800 (96) 24 0.88

01120200 (15) 01118300 (7) 23 0.83

01120500 (16) 23 0.78

01121000 (19) 23 0.93

01126600 (35) 13 0.96

01123000 (24) 23 0.95

01193800 (96) 23 0.92

01194000 (97) 15 0.96

01120700 (17) 01111300 (1) 10 0.85

01120500 (16) 18 0.60

01121000 (19) 18 0.87

01123000 (24) 18 0.84

01125490 (28) 16 0.85

01126600 (35) 10 0.82

01194500 (98) 18 0.72

01120920 (18) 01121000 (19) 21 0.98

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]
30 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Low-flow partial-record stations—Continued

01127400 (40) 01118300 (7) 24 0.85

01120500 (16) 24 0.80

01121000 (19) 24 0.91

01123000 (24) 24 0.96

01194500 (98) 24 0.96

01127700 (42) 01118300 (7) 25 0.81

01120500 (16) 25 0.85

01121000 (19) 25 0.85

01123000 (24) 25 0.87

01194500 (98) 25 0.85 

01127790 (43) 01118300 (7) 14 0.44

01121000 (19) 14 0.62

01123000 (24) 14 0.73

01193500 (94) 14 0.59

01193800 (96) 14 0.80

01194500 (98) 14 0.54

01195200 (103) 14 0.68

01127800 (44) 01118300 (7) 30 0.86

01194000 (97) 17 0.92

01194500 (98) 30 0.91

01195200 (103) 27 0.86

01183990 (49) 01120500 (16) 24 0.79

01187400 (61) 24 0.77

01192600 (84) 24 0.85

01171800 (45) 22 0.91

01175670 (46) 24 0.86

01184300 (52) 01120500 (16) 39 0.88

01171800 (45) 39 0.65

01175670 (46) 39 0.86

01187300 (60) 39 0.77

01180000 (47) 39 0.74

01188000 (66) 39 0.83

01191900 (82) 01120500 (16) 31 0.86

01121000 (19) 31 0.84

01123000 (24) 31 0.89

01187300 (60) 31 0.81

01188000 (66) 31 0.88

01194500 (98) 31 0.84

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Low-flow partial-record stations—Continued

01192800 (87) 01118300 (7) 23 0.84

01120500 (16) 23 0.74

01193800 (96) 21 0.88

01195200 (103) 20 0.85

01204800 (130) 21 0.87

01193120 (90) 01118300 (7) 24 0.96

01120500 (16) 24 0.88

01193800 (96) 23 0.95

01194000 (97) 14 0.97

01194500 (98) 24 0.97

01195200 (103) 24 0.94

01193130 (91) 01118300 (7) 24 0.90

01120500 (16) 24 0.84

01193800 (96) 24 0.92

01194000 (97) 18 0.95

01194500 (98) 24 0.92

01195200 (103) 21 0.93

01204800 (130) 24 0.84

01193210 (92) 01118300 (7) 19 0.89

01120500 (16) 19 0.88

01121000 (19) 19 0.89

01123000 (24) 19 0.90

01126600 (35) 9 0.70

01193800 (96) 19 0.88

01195200 (103) 16 0.91

01193300 (93) 01118300 (7) 19 0.86

01120500 (16) 19 0.77

01121000 (19) 19 0.87

01123000 (24) 19 0.81

01193800 (96) 19 0.85

01194000 (97) 11 0.89

01194500 (98) 19 0.83

01195200 (103) 16 0.86

01193600 (95) 01118300 (7) 21 0.83

01121000 (19) 21 0.89

01193800 (96) 21 0.93

01194000 (97) 13 0.93

01195200 (103) 18 0.88

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.—Continued

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]
Table 8 31

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Low-flow partial-record stations—Continued

01196600 (107) 01195100 (100) 48 0.77

01208950 (144) 48 0.80

01208990 (145) 48 0.84

01198700 (110) 01187300 (60) 22 0.89

01187800 (63) 22 0.88

01188000 (66) 22 0.90

01199200 (116) 22 0.82

01206400 (135) 22 0.92

01201890 (121) 01188000 (66) 23 0.88

01199200 (116) 23 0.85

01201190 (119) 23 0.89

01204800 (130) 23 0.93

01208990 (145) 13 0.97

01202700 (123) 01187300 (60) 23 0.82

01188000 (66) 23 0.86

01199200 (116) 23 0.91

01204800 (130) 21 0.80

01206400 (135) 18 0.84

01203100 (125) 01187300 (60) 28 0.88

01188000 (66) 28 0.85

01201190 (119) 14 0.93

01204800 (130) 26 0.89

01208990 (145) 17 0.93

01203700 (127) 01187300 (60) 26 0.80

01188000 (66) 26 0.90

01199200 (116) 26 0.85

01204800 (130) 24 0.81

01208900 (142) 0195200 (103) 24 0.75

01204800 (130) 24 0.67

01208950 (144) 16 0.59

Short-term continuous stations

01119320 (11) 01118300 (7) 35 0.85

01120500 (16) 35 0.78

01121000 (19) 35 0.87

01123000 (24) 35 0.84

01186400 (57) 01187300 (60) 53 0.96

USGS station 

number 

(map reference 

number)

Nearby index 

stations used 

in relation 

(map reference 

number)

Number of 

streamflow 

measurements 

or daily mean 

streamflows 

used in relation

Correlation 

coefficient

Short-term continuous stations—Continued

01187680 (62) 01187300 (60) 22 0.72

01187400 (61) 22 0.81

01187800 (63) 22 0.90

01188000 (66) 22 0.82

01206400 (135) 22 0.89

01189180 (69) 01187850 (64) 24 0.43

01188000 (66) 24 0.70

01192600 (84) 24 0.32

01199200 (116) 24 0.67

01190055 (74) 01118300 (7) 23 0.47

01120500 (16) 23 0.22

01121000 (19) 23 0.54

01126600 (35) 14 0.65

01123000 (24) 23 0.63

01187300 (60) 23 0.73

01195200 (103) 23 0.42

01195117 (101) 01193800 (96) 13 0.75

01194500 (98) 13 0.88

01195146 (102) 01118300 (7) 35 0.70

01195100 (100) 35 0.86

01198800 (111) 01187300 (60) 23 0.79

01201190 (119) 11 0.95

01201930 (122) 23 0.68

01206400 (135) 17 0.45

01208990 (145) 23 0.80

01198860 (112) No index stations for correlation

01198870 (113) No index stations for correlation

01203805 (128) 01187300 (60) 27 0.67

01188000 (66) 27 0.66

01208950 (144) 27 0.60

01208990 (145) 27 0.65

01208999 (145) 01188000 (66) 26 0.92

01204800 (130) 26 0.87

01208950 (144) 26 0.83

01208990 (145) 26 0.89

Table 8. Summary of low-flow correlation coefficients at short-term stations and partial-record sites in Connecticut.—Continued

[Index Station used in MOVE.3 equation shown in bold; USGS, U.S. Geological Survey; number in parentheses is map reference number on figure 2]
32 Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005 Table 9. Low-flow statistics derived using the MOVE.3 method for short-term streamgaging stations and partial-record sites in Connecticut. [USGS, U.S. Geological Survey; ft3/s, cubic feet per second; --, not computed; ≤, less than or equal to] Map reference number (fig. 2) USGS partial- record site number River name Low-flow frequency, in ft3/s Flow durations, in ft3/s August median flow, in ft3/s Cor- relation coeffi- cient Index station used in relation 7-day, 10-year 7-day, 2-year 30-day, 2-year 99 98 97 95 90 85 Streamflow, in ft3/s

8 01118350 Green Fall River 0.60 2.02 3.70 0.92 1.35 1.81 2.61 4.14 5.79 5.28 0.91 011183009 01118750 Haleys Brook 0.04 0.21 0.49 0.07 0.12 0.18 0.30 0.57 0.91 0.8 0.95 01118300

10 01119255 Delphi Brook 0.08 0.33 0.59 0.08 0.15 0.25 0.33 0.55 0.78 0.68 0.90 0112050012 01119360 Conat Brook 0.36 0.55 0.78 0.45 0.48 0.52 0.60 0.73 0.92 0.86 0.88 0119380015 01120200 Tenmile River 0.29 0.73 1.33 0.35 0.48 0.61 0.82 1.36 2.03 1.82 0.93 0112100017 01120700 Bigelow Brook 0.84 1.64 2.52 0.96 1.21 1.44 1.77 2.57 3.42 3.16 0.87 0112100018 01120920 Mount Hope River 0.10 0.23 0.41 0.11 0.15 0.19 0.26 0.42 0.61 0.55 0.98 0112100020 01121300 Fenton River 0.50 1.16 2.00 0.88 0.79 0.99 1.28 2.05 2.95 2.67 0.97 0112100021 01121350 Fenton River -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --27 01125300 English Neighborhood Brook 0.01 0.09 0.21 0.01 0.03 0.06 0.09 0.19 0.34 0.27 0.92 0112050030 01125600 Mashamoquet Brook 0.25 0.65 1.21 0.30 0.42 0.54 0.73 1.24 1.88 1.68 0.95 0112100031 01125900 Cady Brook 0.41 1.13 1.71 0.40 0.64 0.91 1.13 1.64 2.12 1.92 0.84 0112050036 01126700 Kitt Brook 0.30 0.61 0.96 0.34 0.42 0.50 0.65 0.96 1.38 1.38 0.96 0112300039 01127100 Broad Brook 0.33 1.10 2.00 0.51 0.74 0.99 1.42 2.23 3.11 2.84 0.91 0111830040 01127400 Susquetonscut Brook 0.49 0.91 1.35 0.56 0.66 0.77 0.97 1.35 1.86 1.86 0.96 0112300042 01127700 Trading Cove Brook 0.30 0.87 1.38 0.41 0.64 0.78 1.01 1.63 2.21 2.02 0.85 0119450043 01127790 Latimer Brook -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --44 01127800 Fourmile River 0.06 0.28 0.54 0.10 0.18 0.24 0.34 0.68 1.03 0.91 0.91 0119450049 01183990 Jawbuck Brook 0.29 0.52 0.66 0.35 0.40 0.42 0.48 0.66 0.80 0.80 0.91 0117180052 01184300 Gillette Brook 0.01 0.11 0.26 0.01 0.03 0.07 0.11 0.24 0.41 0.33 0.89 0112050082 01191900 Charter Brook 0.35 0.64 0.95 0.40 0.47 0.54 0.68 0.95 1.30 1.30 0.89 0112300087 01192800 Parmalee Brook 0.20 0.31 0.46 0.25 0.26 0.29 0.34 0.42 0.55 0.51 0.88 0119380090 01193120 Ponset Brook 0.14 0.47 0.81 0.20 0.33 0.42 0.56 0.98 1.40 1.26 0.97 0119450091 01193130 Candlewood Hill Brook 0.09 0.18 0.34 0.13 0.14 0.17 0.21 0.30 0.45 0.40 0.89 0119380092 01193210 Raymond Brook 0.01 0.07 0.15 0.02 0.04 0.05 0.09 0.17 0.27 0.23 0.91 0119520093 01193300 Blackledge River 0.14 0.36 0.66 0.17 0.23 0.30 0.40 0.68 1.02 0.91 0.87 0112100095 01193600 Flat Brook 0.08 0.15 0.26 0.10 0.12 0.13 0.17 0.23 0.33 0.3 0.93 01193800

107 01196600 Willow Brook 1.76 3.56 4.80 1.97 2.57 3.03 3.60 4.94 6.09 6.29 0.84 01208990110 01198700 Brown Brook 0.08 0.24 0.48 0.12 0.17 0.21 0.27 0.49 0.79 0.70 0.92 01206400121 01201890 Pond Brook 0.34 0.77 1.38 0.42 0.58 0.69 0.85 1.38 2.06 1.94 0.93 01204800123 01202700 Butternut Brook 0.00 0.11 0.13 0.00 0.01 0.03 0.06 0.13 0.22 0.22 0.91 01199200125 01203100 Jacks Brook 0.28 0.81 1.27 0.33 0.49 0.63 0.82 1.33 1.82 1.91 0.93 01208990127 01203700 Wood Creek 0.09 0.27 0.49 0.12 0.16 0.20 0.25 0.39 0.62 0.68 0.90 01188000142 01208900 Patterson Brook -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --
Table 9 33

Table 9. Low-flow statistics derived using the MOVE.3 method for short-term streamgaging stations and partial-record sites in Connecticut.—Continued[USGS, U.S. Geological Survey; ft3/s, cubic feet per second; --, not computed]

Map 

reference 

number 

(fig. 2)

USGS 

short-term 

station 

number

River name

Low-flow frequency, in ft3/s Flow durations, in ft3/s August 

median 

flow, 

in ft3/s

Correlation 

coefficient

Index 

station 

used in 

relation

7-day, 

10-year

7-day, 

2-year

30-day, 

2-year 99 98 97 95 90 85

Streamflow, in ft3/s

11 01119320 Roaring Brook 0.39 1.01 1.88 0.47 0.65 0.84 1.13 1.93 2.90 2.59 0.87 0112100057 01186400 Sandy Brook 2.69 4.98 7.25 2.99 3.84 4.53 5.49 7.34 9.10 8.43 0.92 0118730062 01187680 Cherry Brook 0.02 0.08 0.23 0.03 0.05 0.07 0.10 0.23 0.48 0.40 0.89 0120640069 01189180 Hop Brook -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --74 01190055 Podunk River -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --

101 01195117 Hammonasset River 0.00 0.03 0.13 0.00 0.01 0.02 0.04 0.24 0.67 0.49 0.88 01194500102 01195146 Pond Meadow Brook 0.01 0.09 0.24 0.02 0.04 0.07 0.12 0.27 0.49 0.50 0.86 01195100111 01198800 Hollenbeck River 1.02 1.83 2.66 1.21 1.55 1.84 2.37 3.05 3.84 3.68 0.95 01201190112 01198860 Deming Brook -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --113 01198870 Ledgy Brook -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --128 01203805 Weekeepeemee River -- -- -- -- -- -- -- -- -- -- ≤ 0.80 --146 01208999 Little River 0.02 0.15 0.39 0.04 0.07 0.11 0.17 0.38 0.63 0.69 0.83 01208950
Prepared by the Pembroke Publishing Service Center

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

Virginia de Lima, Director

U.S. Geological Survey

Connecticut Water Science Center

101 Pitkin St.

East Hartford, CT 06108

or visit our Web site at:

http://ct.water.usgs.gov
Ahearn—Flow Durations, Low-Flow Frequencies, and Monthly Median Flows for Selected Streams in Connecticut through 2005—Scientific Investigations Report 2007–5270