HOUSATONIC RIVER BASIN 01205600 WEST BRANCH NAUGATUCK RIVER AT TORRINGTON, CT LOCATION.--Lat 41o48'03", long 73o07'26", Litchfield County, Hydrologic Unit 01100005, on right bank just downstream from bridge on Prospect Street in Torrington, 0.5 mi upstream from confluence with East Branch, and 3 mi downstream from Stillwater Pond. DRAINAGE AREA.--33.8 mi2. PERIOD OF RECORD.--August 1956 to current year. REVISED RECORDS.--WDR CT-83-1: Drainage area, 1968-70(P), 1972-82(P). GAGE.--Water-stage recorder. Datum of gage is 541.70 ft above sea level. See WSP 1721 for history of change prior to May 24, 1960. May 24, 1960, to July 2, 1965, water-stage recorder, and July 3-30, 1965, nonrecording gage 80 ft upstream on right bank at datum 1.98 ft higher. July 31 to Sept. 27, 1965, nonrecording gage at present site and datum 1.98 ft higher. September 27, 1965 to August 28, 1969, water-stage recorder at present site and datum 1.98 ft higher. August 28, 1969 to August 25, 1986, water-stage recorder at present site and datum 0.14 ft lower. REMARKS.--Records good except for periods of estimated record, which are poor. Several measurements of water temperature and specific conductance were made during the water year and are listed in the miscellaneous specific conductance and temperature determinations tables. City of Torrington diverts an average of about 4 mgd for municipal supply from North Pond, Whist Pond, and Reuben Hart Reservoir. Occasional regulation at low flow by Stillwater Pond. High flow regulated by Hall Meadow Brook Detention Reservoir. EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge, 11,900 ft3/s, Aug. 19, 1955, by computation of peak flow over dam 3 mi upstream; drainage area, 24.4 mi2. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.9 21 72 119 e39 120 58 38 39 3.5 5.7 2.0 2 12 29 56 135 e36 81 53 36 26 3.6 9.9 .62 3 11 22 49 98 e34 61 49 36 18 2.6 5.0 .31 4 7.4 19 44 76 e32 50 50 30 19 2.5 5.3 .49 5 6.8 18 229 60 e31 44 46 29 15 2.4 53 .35 6 6.0 19 203 53 e30 46 43 30 13 1.7 100 .33 7 6.3 20 125 142 e29 60 43 26 12 4.4 46 .35 8 6.5 13 92 121 e27 198 40 22 12 2.6 e34 .21 9 6.8 14 67 78 e27 425 47 18 9.2 2.1 e21 .26 10 9.7 25 74 58 e26 185 60 20 8.5 1.4 e12 .30 11 7.2 22 217 48 e25 110 52 30 8.3 26 e7.5 .86 12 5.7 22 136 48 e25 88 51 34 25 8.7 e6.5 .46 13 6.1 22 84 66 e25 83 110 31 42 7.1 e5.2 .68 14 6.4 17 68 101 e24 95 73 26 25 5.6 e4.2 .38 15 5.9 18 61 141 e24 108 63 26 8.2 5.1 e3.5 .44 16 6.8 14 54 176 e23 105 58 26 7.0 3.4 e3.1 .29 17 5.1 13 54 182 e23 108 53 24 3.8 9.0 e2.8 6.9 18 5.2 16 69 126 e23 98 51 23 3.5 15 e2.5 2.6 19 5.5 15 67 99 e22 82 91 26 3.3 8.1 e2.4 1.1 20 12 14 56 185 e22 72 76 28 3.2 5.4 e2.2 1.3 21 19 51 50 256 e22 76 66 23 3.0 4.2 e2.2 1.8 22 15 166 47 179 e22 98 65 23 3.1 3.5 e2.1 14 23 23 68 48 130 33 92 57 20 3.0 4.6 e2.1 15 24 40 41 448 104 69 76 53 21 2.8 9.8 e2.0 7.8 25 27 32 324 89 60 65 48 41 2.9 10 e2.0 5.5 26 20 30 191 76 44 60 43 35 5.1 11 e2.3 12 27 17 23 115 67 35 59 36 27 3.5 20 e2.0 8.6 28 14 173 92 56 105 58 35 18 2.9 12 e2.4 5.2 29 13 174 78 50 --- 57 33 31 2.8 21 e2.1 2.6 30 13 106 58 46 --- 59 33 105 2.8 13 e1.8 2.1 31 12 --- 54 e41 --- 67 --- 52 --- 8.0 e1.7 --- TOTAL 361.3 1237 3382 3206 937 2986 1636 955 332.9 237.3 354.5 94.83 MEAN 11.7 41.2 109 103 33.5 96.3 54.5 30.8 11.1 7.65 11.4 3.16 MAX 40 174 448 256 105 425 110 105 42 26 100 15 MIN 5.1 13 44 41 22 44 33 18 2.8 1.4 1.7 .21 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1957 - 1995, BY WATER YEAR (WY) MEAN 32.2 53.9 69.6 65.1 64.9 118 134 69.9 46.3 19.8 20.9 21.4 MAX 133 151 253 257 188 246 270 203 226 90.9 115 198 (WY) 1990 1989 1974 1978 1981 1977 1987 1989 1972 1972 1969 1975 MIN 3.83 5.31 4.75 3.64 15.1 40.7 30.1 21.1 6.97 2.69 2.59 3.16 (WY) 1965 1965 1981 1981 1980 1981 1985 1965 1964 1965 1968 1995 SUMMARY STATISTICS FOR 1994 CALENDAR YEAR FOR 1995 WATER YEAR WATER YEARS 1957 - 1995 ANNUAL TOTAL 23874.5 15719.83 ANNUAL MEAN 65.4 43.1 59.6 HIGHEST ANNUAL MEAN 97.4 1972 LOWEST ANNUAL MEAN 21.3 1965 HIGHEST DAILY MEAN 448 Dec 24 448 Dec 24 2120 Jan 9 1978 LOWEST DAILY MEAN 5.1 Sep 16 .21 Sep 8 .21 Sep 8 1995 ANNUAL SEVEN-DAY MINIMUM 5.9 Oct 13 .33 Sep 4 .33 Sep 4 1995 INSTANTANEOUS PEAK FLOW 728 Mar 9 3180 Aug 4 1987 INSTANTANEOUS PEAK STAGE 6.19 Mar 9 8.65 Aug 4 1987 INSTANTANEOUS LOW FLOW .14 Sep 8 .14 Sep 8 1995 10 PERCENT EXCEEDS 180 104 135 50 PERCENT EXCEEDS 38 25 31 90 PERCENT EXCEEDS 9.4 2.4 5.8 e Estimated