CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER AT THOMPSONVILLE, CT LOCATION.--Lat 41×59'14", long 72×36'21", 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 recorder and crest-stage gage. 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. Telephone telemetry at station. Satellite telemetry at station. REMARKS.--Records good except those for periods of estimated daily discharges, which are poor. 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 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6200 6750 15300 e8000 14700 16600 56200 10700 8360 6200 3640 3910 2 4720 7120 13300 e7000 15800 19200 60300 10900 7970 5480 3390 3380 3 4260 8270 14600 e6500 22600 20000 67900 8320 9620 5120 3220 3730 4 5220 8520 16900 6710 26400 35400 65400 10100 8130 4930 2980 3190 5 4470 6940 16500 6860 25600 59000 60400 7890 4830 5170 2930 3410 6 4910 7190 13000 7950 24000 53900 55600 11300 4380 7800 2880 3430 7 5190 6140 13500 9360 20200 39700 e46500 13300 5390 9130 2830 4680 8 7490 5310 13900 9440 17200 27000 e46800 12600 7910 6440 2770 7250 9 7930 4900 12500 7240 15000 21300 48300 12000 7360 5050 2790 3970 10 5890 4810 11900 7760 14000 20700 47900 12600 6110 8380 e2750 7380 11 10100 8860 12000 8340 14600 20800 43200 13300 4170 6260 e2700 8140 12 10600 9150 11800 e9000 14500 19500 35100 12500 4030 5440 e2650 6550 13 8470 7520 11300 e10200 15100 17200 27700 10900 3870 5550 e2600 6100 14 10600 8900 11600 e9500 15700 16200 23000 10600 4280 4750 e3800 5100 15 11800 9110 10300 e9000 14100 e16500 21200 8680 3980 5250 3590 4460 16 13200 5960 10000 e10000 13600 e15900 17500 e7500 4780 3720 3100 13600 17 12000 8360 10000 10900 13600 14900 16700 5220 4030 4740 e3000 62100 18 11400 10500 11200 12600 13500 15500 17000 6090 3730 3530 4490 72900 19 11900 9750 10100 15800 16300 17400 17700 7350 3340 3760 4900 64200 20 11400 10100 9140 19800 15600 20100 16800 18800 3190 3640 3300 44200 21 11000 9870 9190 21200 14700 22600 16400 36500 3240 3750 3150 33600 22 11300 10800 9560 20700 11900 31000 16000 29300 3540 3360 3360 27900 23 9190 9880 12200 17900 12300 72700 15100 17400 3460 4540 3100 21700 24 6530 8020 e15500 e19000 12300 76300 16500 15500 3380 4170 3280 19500 25 5790 10500 16800 31700 12800 60200 15000 22000 3410 3260 3750 19900 26 5520 9170 10900 48300 12500 44600 11500 20700 3460 3100 3920 16100 27 e7300 12100 7750 47500 13100 37300 12500 15300 3460 3000 4610 14200 28 7260 18000 e6500 39000 13300 36400 11800 13300 3210 6440 4330 12800 29 8780 18300 8600 29800 --- 38700 10900 12600 6540 4500 4360 12500 30 7910 16900 10900 21000 --- 46100 11300 9810 8940 4870 3300 12200 31 7480 --- e9000 16700 --- 52700 --- 6790 --- 5530 3220 --- TOTAL 255810 277700 365740 504760 445000 1005400 928200 409850 152100 156860 104690 522080 MEAN 8252 9257 11800 16280 15890 32430 30940 13220 5070 5060 3377 17400 MAX 13200 18300 16900 48300 26400 76300 67900 36500 9620 9130 4900 72900 MIN 4260 4810 6500 6500 11900 14900 10900 5220 3190 3000 2600 3190 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1928 - 1999, BY WATER YEAR (WY) MEAN 10110 14880 15600 14290 13750 25150 45150 27120 13660 7884 6959 7212 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. CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER AT THOMPSONVILLE, CT—Continued SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1928 - 1999 ANNUAL TOTAL 6884980 5128190 ANNUAL MEAN 18860 14050 16790 HIGHEST ANNUAL MEAN 24920 1996 LOWEST ANNUAL MEAN 7847 1965 HIGHEST DAILY MEAN 108000 Apr 1 76300 Mar 24 278000 Mar 20 1936 LOWEST DAILY MEAN 3410 Aug 10 2600 Aug 13 968 Oct 20 1963 ANNUAL SEVEN-DAY MINIMUM 4480 Sep 2 2730 Aug 7 1870 Aug 15 1964 INSTANTANEOUS PEAK FLOW 80800 Sep 18 282000 Mar 20 1936 INSTANTANEOUS PEAK STAGE 4.56 Sep 18 a16.60 Mar 20 1936 INSTANTANEOUS LOW FLOW 2660 Aug 10 968 Oct 20 1963 10 PERCENT EXCEEDS 36800 30300 37300 50 PERCENT EXCEEDS 12200 10100 11100 90 PERCENT EXCEEDS 5420 3460 4060 a From floodmarks.