CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER AT THOMPSONVILLE, CT LOCATION.--Lat 4159'14", long 7236'21", Hartford County, Hydrologic Unit 01080205, on right bank just upstream from Enfield Dam, 1.0 mi downstream from Thompsonville, 3.0 mi downstream from Massachusetts-Connecticut State line, and at mile 63.6. DRAINAGE AREA.--9,660 mi2. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1928 to current year. REVISED RECORDS.--WSP 741: 1932. WDR CT-77-1: 1976. WDR CT-83-1: Drainage area, 1982. GAGE.--Water-stage recorders on river. Datum of gage is 38.48 ft above sea level. November 28, 1986, to August 2, 1990, recorder at site 200 ft. downstream at datum 0.28 ft. lower. REMARKS.--Records good except for periods of estimated record, which are fair. Telephone and satellite gage-height telemeters at this station. Flow regulated by power plants, by diversion from Chicopee River basin and by First Connecticut and Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs, Quabbin Reservoir, and other reservoirs, combined usable capacity, about 107 billion ft3. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5940 6850 15600 10200 12600 21800 108000 15900 9440 29300 6220 5700 2 6620 14600 16400 9460 11600 23000 105000 16200 18800 27000 5440 5000 3 6770 22200 16500 8410 11700 26200 102000 17600 16600 30000 5470 5730 4 9010 20800 14700 9000 13200 28000 97600 15600 14100 28300 5430 4950 5 5960 20800 13800 13600 9680 27000 92600 18900 13900 23300 5460 4320 6 7480 19900 13100 17500 11000 26200 84200 23500 12300 20600 4250 3640 7 7360 19600 13800 22900 10600 26000 72100 31200 8770 20000 4980 3410 8 8120 21800 12500 38200 9270 22400 58100 33500 6280 18100 6170 4290 9 7110 19200 12300 62500 10700 30400 51300 30600 8000 18200 3990 6370 10 6690 21300 11600 77200 10200 56000 46000 27900 10100 14500 3410 6280 11 6140 27200 12500 69100 9210 68500 39100 40800 9760 15700 5690 5410 12 3870 23000 10100 57000 12500 65900 33200 43200 10800 17900 8620 5880 13 3220 20900 10100 50800 19000 46600 30100 34000 9900 18700 12600 6840 14 3740 20200 8740 41700 19400 33600 30500 27300 21500 19200 15600 5970 15 5280 17100 8410 35800 18000 31200 24100 24600 60500 17900 12700 4870 16 6130 13800 11700 24700 15000 26900 22500 18800 70600 15000 8410 e3880 17 3510 14000 9830 21100 15200 24600 22100 16100 72700 12200 7290 e8000 18 3790 14200 7250 18200 18500 24500 23100 12800 73700 11600 7630 e9000 19 3890 14800 8180 17700 21000 26000 23900 15800 64800 10900 8880 6890 20 3980 11400 10400 17600 23000 29000 24900 15000 53000 10300 6730 5100 21 3960 12000 8280 18200 22800 26700 32200 12700 46900 10300 5640 4320 22 3740 13300 7630 16500 21400 25300 32400 9520 34900 10300 3510 4800 23 4230 13700 8060 16100 19700 23500 27100 10400 28200 10100 3420 5260 24 5180 8350 7240 15900 20500 21200 23500 10200 24700 11600 5300 4550 25 4300 12300 6870 15300 21700 22400 20900 6840 22400 9810 7610 4950 26 3890 13500 9930 15900 22200 20800 20700 7660 19500 9030 10900 4570 27 4480 13700 11300 16600 21800 20800 19400 9650 25400 7470 12200 4600 28 6810 14000 10800 13600 21500 35300 19400 6630 45800 8080 7620 5420 29 6880 13500 12800 12200 --- 59900 18500 7040 45100 6450 5360 6860 30 6930 13400 13200 12200 --- 84800 17600 6530 32100 6480 4510 7810 31 6820 --- 12400 12900 --- 101000 --- 5490 --- 5720 4840 --- TOTAL 171830 491400 346020 788070 452960 1105500 1322100 571960 890550 474040 215880 164670 MEAN 5543 16380 11160 25420 16180 35660 44070 18450 29690 15290 6964 5489 MAX 9010 27200 16500 77200 23000 101000 108000 43200 73700 30000 15600 9000 MIN 3220 6850 6870 8410 9210 20800 17600 5490 6280 5720 3410 3410 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1928 - 1998, BY WATER YEAR (WY) MEAN 10140 14960 15650 14260 13720 25040 45350 27320 13790 7924 7009 7069 MAX 31730 33310 39000 30180 39100 89210 76050 51520 42600 28810 22530 42700 (WY) 1978 1996 1997 1978 1981 1936 1960 1972 1984 1973 1955 1938 MIN 2690 5015 5548 4311 4386 6965 14920 9611 4900 3202 2911 2719 (WY) 1964 1965 1948 1931 1940 1940 1995 1941 1964 1962 1965 1964 e Estimated. SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1928 - 1998 ANNUAL TOTAL 6270390 6994980 ANNUAL MEAN 17180 19160 16830 HIGHEST ANNUAL MEAN 24920 1996 LOWEST ANNUAL MEAN 7847 1965 HIGHEST DAILY MEAN 82700 Apr 9 108000 Apr 1 278000 Mar 20 1936 LOWEST DAILY MEAN 2920 Jul 29 3220 Oct 13 968 Oct 20 1963 ANNUAL SEVEN-DAY MINIMUM 3510 Aug 7 3870 Oct 17 1870 Aug 15 1964 INSTANTANEOUS PEAK FLOW 111000 Apr 1 282000 Mar 20 1936 INSTANTANEOUS PEAK STAGE 6.60 Apr 1 a16.60 Mar 20 1936 INSTANTANEOUS LOW FLOW b2880 Aug 22 968 Oct 20 1963 10 PERCENT EXCEEDS 37700 36800 37300 50 PERCENT EXCEEDS 13200 13700 11200 90 PERCENT EXCEEDS 4500 5150 4080 a From floodmarks. b Also occurred Aug. 23.