CONNECTICUT RIVER BASIN 01172003 CONNECTICUT RIVER BELOW HOLYOKE DAM AT HOLYOKE, MA LOCATION.--Lat 42o12'36", long 72o35'44", Hampden County, Hydrologic Unit 01080201, on right bank, 2,200 ft down stream from dam of Holyoke Water Power Co. in Holyoke, MA. and at mile 86. DRAINAGE AREA.--8,309 mi2 . PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder. Datum of gage is 43.276 ft above sea level. REMARKS.--Records good except those for periods of estimated record, which are fair. Flow regulated by powerplants, by First Connecticut and Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs, and other reservoirs, combined usable capacity, about 47 billion ft3. Records do not include water diverted around gage by Holyoke Water Power Company for industrial use. Telephone gage-height telemeter at this station. EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge since at least 1854, 244,000 ft3/s, March 20, 1936, gage height, 35.0 ft, from floodmarks. 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 1840 30900 11400 6630 41100 26500 12100 74200 8930 7480 12300 3950 2 1830 23500 12600 7330 32700 19800 13600 76800 9060 7880 14500 3240 3 1350 30200 9790 6130 25700 17300 16400 69600 7560 9480 14200 2580 4 2530 30200 9150 e5600 20100 14500 17300 66100 9290 9180 13400 2380 5 6140 26700 10400 e5000 e15000 12700 15300 56600 10800 11000 11700 2640 6 8570 20800 e9500 e4700 e14000 10700 13500 52900 10000 12800 11400 4080 7 8490 17700 e8500 e4400 e13000 e10200 12200 48100 10200 11200 8550 2600 8 5720 18700 e7500 3970 e12500 e9800 12500 40000 10000 9130 9790 2450 9 5540 20100 e6700 6980 e12000 e9700 12400 31800 12100 9420 9110 2230 10 3620 20600 6000 e6500 13700 e9600 12500 26400 17200 7620 8640 1860 11 4790 17900 5640 e6200 13500 e9500 13500 29000 19300 8750 6070 2730 12 5070 30200 8240 e6000 e11500 12800 14000 56300 20100 9460 6690 3000 13 5360 50000 e8000 e5800 e10000 12500 19000 84300 17700 12100 7540 2770 14 3980 50100 e7800 e5700 e9000 12400 21000 84800 20200 25900 6320 3590 15 5800 48200 e7700 e5600 e8700 12500 31800 72700 12500 33800 5360 2100 16 7250 48900 e7600 e5500 e8400 14400 36600 56100 13200 38300 6110 2000 17 8880 48700 e7500 8910 e8100 17000 83000 45600 11600 44200 5270 4710 18 9530 36600 8530 8930 e7800 15600 83800 35500 9710 35200 3710 7690 19 9800 27000 9260 9540 e7600 15300 68900 25300 8200 29200 5910 7610 20 8790 23500 e8500 41900 10500 19600 63100 26200 10300 20100 5540 6050 21 9590 21200 e8000 54700 12800 23300 56500 32000 9480 14800 6640 3530 22 27400 20500 7510 49600 14700 21800 59000 28900 7360 17700 6500 2390 23 40900 19100 8250 36000 22700 17900 68800 25700 5520 18300 6300 5080 24 33600 17200 7840 37700 31100 18200 77700 20700 9260 17000 4820 7780 25 21300 15400 7620 49600 35900 11300 86500 19400 9730 13700 2670 6280 26 18300 13000 8190 53600 39400 13700 81900 15800 8760 11100 2710 4610 27 15400 9230 8840 48300 34900 15800 74100 12500 11200 15000 5490 4550 28 22200 12300 7640 72900 28800 16800 75500 14600 10800 16500 3960 3080 29 48000 14100 8320 69400 28700 15000 70900 11500 7780 18600 4400 5030 30 46500 11400 7790 54200 --- 13600 70000 11900 5580 16800 5100 6670 31 39400 --- 6210 46000 --- 13500 --- 9610 --- 13200 5450 --- TOTAL 437470 773930 256520 733320 543900 463300 1293400 1260910 333420 524900 226150 119260 MEAN 14110 25800 8275 23660 18760 14950 43110 40670 11110 16930 7295 3975 MAX 48000 50100 12600 72900 41100 26500 86500 84800 20200 44200 14500 7780 MIN 1350 9230 5640 3970 7600 9500 12100 9610 5520 7480 2670 1860 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1984 - 1996, BY WATER YEAR (WY) MEAN 9579 12460 10510 9730 9773 17430 33680 17770 10090 6206 5803 4647 MAX 16340 25800 20720 23660 21890 34660 58300 40670 31100 16930 14780 8601 (WY) 1991 1996 1991 1996 1984 1990 1993 1996 1984 1996 1990 1987 MIN 1512 3540 5787 4760 4250 9579 10270 7366 4088 2578 2718 1378 (WY) 1985 1985 1985 1989 1987 1989 1995 1987 1988 1991 1985 1984 SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1984 - 1996 ANNUAL TOTAL 3799944 6966480 ANNUAL MEAN 10410 19030 11990 HIGHEST ANNUAL MEAN 19030 1996 LOWEST ANNUAL MEAN 6580 1985 HIGHEST DAILY MEAN 50100 Nov 14 86500 Apr 25 145000 Jun 1 1984 LOWEST DAILY MEAN 911 Sep 12 1350 Oct 3 519 Sep 30 1984 ANNUAL SEVEN-DAY MINIMUM 1390 Sep 6 2520 Sep 7 707 Sep 18 1984 INSTANTANEOUS PEAK FLOW 94300 Apr 17 153000 Jun 1 1984 INSTANTANEOUS PEAK STAGE 18.79 Apr 17 25.62 Jun 1 1984 INSTANTANEOUS LOW FLOW 1040 Oct 3 a200 Aug 15 1995 10 PERCENT EXCEEDS 24800 48400 26600 50 PERCENT EXCEEDS 8120 12000 7880 90 PERCENT EXCEEDS 1820 4770 2990 a Occurred when Hadley 1 generator shutdown. Discharge was derived from extending the rating below 2.5 feet. e Estimated.