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86 CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER at THOMPSONVILLE, CT LOCATION.--Lat 41°59'14", Long 72°36'21"

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86 CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER at THOMPSONVILLE, CT LOCATION.--Lat 41°59'14 86 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 for periods of estimated record, which are fair. 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. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 105,000 ft3/s, Apr. 4, gage height, 6.68 ft; minimum discharge, 1,910 ft3/s, Aug. 10, gage height, -2.38 ft. DISCHARGE, CUBIC FEET PER SECOND WATER YEAR OCTOBER 2004 TO SEPTEMBER 2005 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 13,600 5,520 31,600 e17,100 e10,800 12,100 56,500 46,200 21,300 19,300 3,660 e8,970 2 12,400 6,950 44,900 e16,000 e10,500 11,700 59,900 45,900 26,100 17,000 6,260 10,700 3 10,900 7,760 49,000 17,600 e10,400 11,700 80,600 41,900 24,800 16,000 7,310 16,000 4 10,100 8,320 41,200 19,500 e10,000 11,900 103,000 37,400 20,300 13,800 7,110 14,100 5 8,980 8,840 30,900 23,900 e10,600 10,800 98,700 33,100 14,000 12,100 5,890 8,600 6 8,140 13,500 24,200 24,700 e10,000 11,000 84,000 28,800 12,000 11,300 5,070 6,530 7 8,850 12,800 21,800 21,400 e10,300 9,040 78,000 24,400 12,400 12,700 3,560 5,850 8 8,630 12,600 19,200 18,000 e10,500 11,000 77,200 24,000 12,700 11,800 5,270 4,700 9 7,090 10,900 21,400 17,300 e10,300 12,300 80,500 20,500 14,100 14,000 3,530 4,560 10 5,480 8,420 24,800 14,500 13,400 13,100 76,600 18,900 13,300 16,900 3,450 3,810 11 6,260 8,210 27,600 15,000 17,900 10,200 65,800 21,700 11,800 17,400 4,120 2,830 12 5,340 8,400 31,200 15,600 16,700 10,300 56,600 19,600 16,200 19,800 5,460 2,380 13 5,650 9,560 27,400 15,700 15,700 10,100 48,300 17,500 18,000 15,800 3,420 4,130 14 4,970 7,560 25,900 22,800 13,800 9,780 39,400 17,300 16,200 11,600 4,770 5,550 15 5,300 6,820 21,300 46,000 14,900 10,000 33,700 15,600 14,000 11,700 5,560 4,810 16 9,310 8,060 e18,000 43,700 16,800 10,000 32,600 16,700 18,900 12,400 3,940 5,350 17 13,100 7,380 e15,500 35,500 18,500 9,240 29,300 17,300 27,500 9,100 4,430 3,680 18 12,300 6,580 e14,200 e29,000 18,100 11,400 28,100 18,900 33,500 10,800 4,380 3,780 19 12,000 6,600 e13,400 e22,900 18,900 10,100 25,600 17,000 37,500 15,500 4,380 3,510 20 11,900 7,580 e11,000 e18,500 16,300 8,500 25,400 15,900 36,700 14,100 4,180 4,110 21 13,300 8,260 e11,700 e15,300 14,900 9,850 28,200 15,000 33,300 10,900 3,210 4,630 22 9,950 7,960 e10,800 e14,000 13,600 10,800 29,500 11,900 25,800 7,780 4,050 4,190 23 8,030 8,940 e10,500 e13,100 13,300 10,700 34,100 13,900 18,500 6,580 5,740 5,360 24 7,930 9,220 27,700 e12,600 12,400 14,200 49,100 16,900 16,200 5,730 4,340 3,700 25 8,330 12,500 41,700 e12,400 12,700 14,700 72,400 27,300 10,700 6,690 3,590 2,920 26 7,600 17,600 e33,800 e12,000 12,200 13,100 71,500 31,200 10,500 7,800 3,550 3,070 27 6,600 21,400 e23,900 e11,700 12,000 12,500 61,900 29,900 10,900 7,480 3,310 4,670 28 5,890 24,000 e18,800 e11,500 11,900 16,200 55,900 23,900 10,100 6,470 2,890 3,340 29 6,970 26,000 e15,700 e11,400 --- 41,800 55,800 20,800 e13,600 4,260 5,410 5,500 30 5,890 29,500 e16,300 e11,200 --- 63,700 49,300 20,400 e17,100 5,210 7,540 6,510 31 7,170 --- e17,500 e11,000 --- 58,600 --- 20,400 --- 5,520 e7,870 --- TOTAL 267,960 337,740 742,900 590,900 377,400 480,410 1,687,500 730,200 568,000 357,520 147,250 167,840 MEAN 8,644 11,260 23,960 19,060 13,480 15,500 56,250 23,550 18,930 11,530 4,750 5,595 MAX 13,600 29,500 49,000 46,000 18,900 63,700 103,000 46,200 37,500 19,800 7,870 16,000 MIN 4,970 5,520 10,500 11,000 10,000 8,500 25,400 11,900 10,100 4,260 2,890 2,380 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1928 - 2005, BY WATER YEAR (WY) MEAN 10,190 14,920 15,950 14,190 13,540 24,870 45,320 26,910 13,940 7,939 7,061 7,303 MAX 31,730 33,310 39,000 30,180 39,100 89,210 76,050 51,520 42,600 28,810 22,530 42,700 (WY) (1978) (1996) (1997) (1978) (1981) (1936) (1960) (1972) (1984) (1973) (1955) (1938) MIN 2,690 5,015 5,548 4,311 4,386 6,965 14,920 9,611 4,900 3,202 2,911 2,719 (WY) (1964) (1965) (1948) (1931) (1940) (1940) (1995) (1941) (1964) (1962) (1965) (1964) e Estimated CONNECTICUT RIVER BASIN 87 01184000 CONNECTICUT RIVER AT THOMPSONVILLE, CT—Continued SUMMARY STATISTICS FOR 2004 CALENDAR YEAR FOR 2005 WATER YEAR WATER YEARS 1928 - 2005 ANNUAL TOTAL 5,747,520 6,455,620 ANNUAL MEAN 15,700 17,690 16,820 HIGHEST ANNUAL MEAN 24,920 1996 LOWEST ANNUAL MEAN 7,847 1965 HIGHEST DAILY MEAN 86,400 Apr 3 103,000 Apr 4 278,000 Mar 20, 1936 LOWEST DAILY MEAN 3,040 Aug 9 2,380 Sep 12 968 Oct 20, 1963 ANNUAL SEVEN-DAY MINIMUM 4,710 Jun 29 3,890 Sep 22 1,870 Aug 15, 1964 MAXIMUM PEAK FLOW 105,000 Apr 4 282,000 Mar 20, 1936 MAXIMUM PEAK STAGE 6.68 Apr 4 a16.60 Mar 20, 1936 INSTANTANEOUS LOW FLOW 1,910 Aug 10 968 Oct 20, 1963 10 PERCENT EXCEEDS 31,000 36,000 37,200 50 PERCENT EXCEEDS 10,800 12,500 11,200 90 PERCENT EXCEEDS 6,120 4,740 4,100 a From floodmarks. 1,000,000 500,000 200,000 100,000 50,000 20,000 DISCHARGE, 10,000 IN CUBIC FEET PER SECOND 5,000 2,000 1,000 O N D J F M A M J J A S 2004 2005 88 CONNECTICUT RIVER BASIN 01184000 CONNECTICUT RIVER AT THOMPSONVILLE, CT—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1956, 1966 to current year. PERIOD OF DAILY RECORD.-- SPECIFIC CONDUCTANCE: October 1974 to September 1999, December 2001 to August 2004. WATER TEMPERATURES: October 1955 to September 1956, October 1973 to September 1999, December 2001 to August 2004. INSTRUMENTATION.--Water-quality monitor since October 1973. EXTREMES FOR PERIOD OF DAILY RECORD.-- SPECIFIC CONDUCTANCE: Maximum, 443 microsiemens Feb. 15, 1992; minimum, 46 microsiemens April 2, 1977. WATER TEMPERATURES: Maximum, 36.5° C Aug. 30, 1977; minimum, 0.0° C on many days during winter periods. WATER-QUALITY DATA, WATER YEAR OCTOBER 2004 TO SEPTEMBER 2005 Turbdty white Dis- pH, Specif. Instan- light, solved water, conduc- Hard- Magnes- Potas- taneous det ang Dis- oxygen, unfltrd tance, Temper- Temper- ness, Calcium ium, sium, dis- 90+/-30 solved percent field, wat unf ature, ature, water, water, water, water, charge, corrctd oxygen, of sat- std uS/cm air, water, mg/L as fltrd, fltrd, fltrd, Date Time cfs NTRU mg/L uration units 25 degC deg C deg C CaCO3 mg/L mg/L mg/L (00061) (63676) (00300) (00301) (00400) (00095) (00020) (00010) (00900) (00915) (00925) (00935) OCT 14..
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