HOUSATONIC RIVER BASIN 01205500 HOUSATONIC RIVER AT STEVENSON, CT LOCATION.--Lat 41o23'02", long 73o10'05", New Haven County, Hydrologic Unit 01100005, on left bank, 0.2 mi downstream from dam of Connecticut Light and Power Company at Stevenson, Fairfield County, 0.2 mi upstream from Eightmile Brook, and at mile 19.2. DRAINAGE AREA.--1,544 mi2. WATER-DISCHARGE RECORD PERIOD OF RECORD.--August 1928 to current year. REVISED RECORDS.--WSP 711: 1929(M). WSP 1231: 1951. WSP 1301: 1933-34(M), 1936-37. WDR CT-83-1: Drainage area. GAGE.--Water-stage recorder. Datum of gage is 24.98 ft above sea level (levels by Corps of Engineers). REMARKS.--Records good except those for periods of estimated record, which are fair. Satellite gage-height telemeter at this station. Ordinary flow completely regulated by Stevenson Hydroelectric Plant. Flow regulated by Lake Candlewood, Lake Lillinonah, Lake Zoar, Cairns and Shepaug Reservoirs, and by diversion out of basin at Shepaug Reservoir. High flows affected by flood control in the Blackberry River basin for 20.5 mi2, but do not appreciably affect monthly runoff. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 118 e5240 e3360 e596 7920 5870 3380 9150 1850 1140 2120 1410 2 116 e3400 e1360 e2070 6900 5080 5120 8890 877 1270 1800 122 3 586 e3370 e1830 e2050 6190 3750 6030 7920 2580 1250 2790 1210 4 118 e2360 e2260 e1470 3470 4360 5130 6820 3560 2030 1810 790 5 116 e4000 e3490 e827 4000 5110 3820 6690 3130 2250 2200 1930 6 2380 e3900 e4120 e615 4950 5210 3630 6700 3520 3010 2310 1190 7 1310 e4410 e4330 e1040 4820 6320 2450 5420 1420 999 898 123 8 1420 e2940 e4550 e1170 4680 5910 3720 5700 1540 651 2740 123 9 120 e4210 e1110 e1850 4930 3960 5180 5320 1960 2180 3010 849 10 3160 e3590 e833 e2100 4550 3360 4160 4970 3080 1860 413 1910 11 1060 e2710 e3200 e2620 4050 4020 4440 5460 3900 2330 128 953 12 115 e10000 e3330 e2190 4210 4160 4230 7510 2960 2840 1530 1300 13 772 e13900 e3590 e163 3250 4350 5240 7770 1950 5650 1360 603 14 108 e13400 e2340 e164 3050 3120 5000 7330 1460 10900 1690 119 15 1420 e11200 e1640 e3070 2970 4900 6310 6680 881 8740 1340 119 16 2490 e7270 e1740 e2810 2980 5030 11300 6730 839 11900 923 968 17 108 e6110 e615 e2450 2980 6020 13400 6380 1450 9440 616 1510 18 1680 e6330 e2590 e2370 805 4600 11300 6200 2050 8070 126 4370 19 1710 e6230 e1920 e7500 2880 5190 9270 6110 1970 7170 937 4170 20 2280 e6010 e1890 e18000 3830 4020 8610 3110 2010 3310 1230 3530 21 2950 e5880 e1990 e16000 4730 6320 7790 4490 1380 4270 1160 2320 22 6700 e5430 e2240 e14000 6750 5620 6760 6410 1440 2920 1170 2840 23 5310 e5510 e1400 e12000 7090 4090 5360 4770 1010 2500 1200 2940 24 4080 e3110 e464 e11000 9140 4150 5830 3900 2370 2750 1130 3370 25 2300 e2830 e208 e15000 9020 3690 6290 2290 1210 2500 1010 3520 26 3090 e3100 e2390 e13000 6800 4230 6330 1880 1220 4550 2100 2660 27 e2000 e3640 e2160 20400 6790 4420 6310 2210 873 5090 1200 1690 28 e4050 e4740 e2330 25000 6580 4340 5040 2960 987 3270 713 1800 29 e6410 e3960 e1950 16600 5750 4240 5000 2090 996 2660 654 2160 30 e6980 e3730 e546 11600 --- 3010 6370 4050 685 2630 1610 3740 31 e6600 --- e555 9990 --- 1360 --- 1220 --- 2640 789 --- TOTAL 71657 162510 66331 219715 146065 139810 182800 167130 55158 122770 42707 54339 MEAN 2312 5417 2140 7088 5037 4510 6093 5391 1839 3960 1378 1811 MAX 6980 13900 4550 25000 9140 6320 13400 9150 3900 11900 3010 4370 MIN 108 2360 208 163 805 1360 2450 1220 685 651 126 119 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1929 - 1996, BY WATER YEAR (WY) MEAN 1426 2255 2809 2997 2981 4817 5353 3276 2157 1279 1144 1124 MAX 8810 8786 7314 9441 6869 12960 11150 8627 7013 4923 8294 8705 (WY) 1956 1956 1974 1949 1976 1936 1983 1989 1972 1938 1955 1938 MIN 259 258 726 356 800 1911 1272 1092 670 294 308 213 (WY) 1965 1979 1965 1981 1980 1989 1985 1986 1965 1962 1964 1964 SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1929 - 1996 ANNUAL TOTAL 803584 1430992 ANNUAL MEAN 2202 3910 2631 HIGHEST ANNUAL MEAN 3956 1938 LOWEST ANNUAL MEAN 990 1965 HIGHEST DAILY MEAN 13900 Nov 13 25000 Jan 28 62400 Oct 16 1955 LOWEST DAILY MEAN 67 Sep 3 108 Oct 14 .00 Oct 12 1930 ANNUAL SEVEN-DAY MINIMUM 114 Sep 12 678 Oct 1 56 Aug 13 1984 INSTANTANEOUS PEAK FLOW 44700 Jan 27 a75800 Oct 16 1955 INSTANTANEOUS PEAK STAGE 18.88 Jan 27 b24.50 Oct 16 1955 INSTANTANEOUS LOW FLOW 57 Nov 10 c 10 PERCENT EXCEEDS 4940 7380 5880 50 PERCENT EXCEEDS 1710 3090 1820 90 PERCENT EXCEEDS 116 820 255 a From rating curve extended above 35,000 ft3/s, on basis of computation of peak flow at Stevenson and Derby Dams and slope-area measurement at gage-heights 21.5 and 23.5 ft. b From floodmarks. c Practically no flow at times, result of regulation. e Estimated.