CONNECTICUT RIVER BASIN 01172003 CONNECTICUT RIVER BELOW HOLYOKE DAM AT HOLYOKE, MA LOCATION.--Lat 4212'36", long 7235'44", Hampden County, Hydrologic Unit 01080201, on right bank, 2,200 ft downstream 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 4450 5690 10100 6950 10600 13900 90500 11200 6690 20200 4530 4410 2 5070 10400 10300 6100 10200 15100 87700 10700 10300 19900 3820 3470 3 6130 13500 e9200 5600 9810 19100 83700 11000 9200 23700 3780 3680 4 6220 14000 e8000 6720 9430 19800 79100 8840 9300 21300 4400 3310 5 3540 14100 6660 9000 5770 18500 75100 11800 9600 16200 3340 2840 6 6240 13500 6990 10300 8120 18900 66600 14500 7410 13900 2590 1980 7 5910 14000 9330 12000 6640 17200 56400 20700 4710 13200 3990 2010 8 5900 15000 7640 28000 6170 14300 45100 24600 4290 11100 4550 3390 9 5280 9940 8040 61400 7960 21200 41700 19600 6920 11500 1870 4720 10 5260 13300 7750 75600 6750 39000 35000 16700 7750 9310 1840 3800 11 4220 18600 8180 63800 7490 51700 29000 27900 7950 13200 5380 4880 12 1940 15600 6270 48400 10500 47500 24500 28600 8310 14300 7200 4860 13 1920 14400 7160 37500 13700 32100 21800 22100 7390 13800 9030 6320 14 2620 13400 5590 25700 14000 22600 22800 17000 15900 13400 10800 4660 15 5050 9850 6860 19500 12900 21400 15400 14400 50500 11600 7330 3530 16 3600 7360 8500 11300 9510 17100 15800 8660 56300 8610 6760 3000 17 1890 7670 6020 13800 10500 16200 13800 6780 59000 7340 5840 5220 18 2760 7910 4870 10300 11900 15700 15900 7420 60400 7510 7190 5080 19 2460 8470 6440 10900 14100 16100 15700 10400 52000 9270 7380 3180 20 2680 6490 7490 10400 15600 17500 16500 8530 42600 7330 4550 3020 21 2760 9080 4670 11300 15600 15200 24500 7270 37800 8740 3050 2800 22 2880 8960 5890 10500 14100 15000 23000 6380 26600 7300 1970 3310 23 3510 8180 5960 9450 12600 12900 18400 7540 20900 8000 3260 3240 24 3840 5300 4730 8160 13200 11800 15100 6760 16600 8660 4260 2820 25 2830 8900 4530 7230 13500 12600 12800 4580 15800 7820 4710 3760 26 2680 9420 7710 9400 13900 11200 13200 6100 14300 6900 6760 2700 27 3550 9120 7930 10000 13700 13000 11700 5770 23000 6220 7080 3300 28 5630 9720 7650 6810 13800 29300 13400 5190 41600 6630 3860 4150 29 5260 8760 9350 7030 --- 51100 14700 4530 36400 4510 3880 5160 30 5420 9250 7710 7710 --- 72000 14100 4100 23800 5520 2750 4610 31 4910 --- 8250 9610 --- 84000 --- 2710 --- 3950 3900 --- TOTAL 126410 319870 225770 570470 312050 783000 1013000 362360 693320 340920 151650 113210 MEAN 4078 10660 7283 18400 11140 25260 33770 11690 23110 11000 4892 3774 MAX 6240 18600 10300 75600 15600 84000 90500 28600 60400 23700 10800 6320 MIN 1890 5300 4530 5600 5770 11200 11700 2710 4290 3950 1840 1980 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1984 - 1998, BY WATER YEAR (WY) MEAN 9314 12380 11480 10460 9949 17830 34120 17690 10770 6518 5679 4562 MAX 16340 25800 27410 23660 21890 34660 58300 40670 31100 16930 14780 8601 (WY) 1991 1996 1997 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 e Estimated. SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1984 - 1998 ANNUAL TOTAL 4430160 5012030 ANNUAL MEAN 12140 13730 12330 HIGHEST ANNUAL MEAN 19030 1996 LOWEST ANNUAL MEAN 6580 1985 HIGHEST DAILY MEAN 64900 Apr 9 90500 Apr 1 145000 Jun 1 1984 LOWEST DAILY MEAN 1820 Aug 8 1840 Aug 10 519 Sep 30 1984 ANNUAL SEVEN-DAY MINIMUM 2070 Aug 4 2710 Oct 17 707 Sep 18 1984 INSTANTANEOUS PEAK FLOW 92300 Apr 1 153000 Jun 1 1984 INSTANTANEOUS PEAK STAGE 18.54 Apr 1 25.62 Jun 1 1984 INSTANTANEOUS LOW FLOW 911 May 31 a200 Aug 15 1995 10 PERCENT EXCEEDS 27800 27100 27400 50 PERCENT EXCEEDS 8460 8960 8100 90 PERCENT EXCEEDS 3360 3520 3040 a Occurred when Hadley 1 generator shut down. Discharge was derived from extending the rating below 2.5 ft.