CONNECTICUT RIVER BASIN
01154500 CONNECTICUT RIVER AT NORTH WALPOLE, NH
LOCATION.--Lat 43°07'34", long 72°26'14", Cheshire County, Hydrologic Unit 01080104, on left bank, at North Walpole,
100 ft upstream from Saxtons River, 0.7 mi downstream from Vilas Bridge between Bellows Falls, VT, and North
Walpole, and at mile 172.5.
DRAINAGE AREA.--5,493 mi², includes that of Saxtons River.
PERIOD OF RECORD.--Discharge records: March 1942 to current year.
Water-quality records: Water years 1975 to September 1980 (published as "at Walpole"), October 1980.
PERIOD OF DAILY RECORD.--
SPECIFIC CONDUCTANCE: October 1980 to September 1981.
WATER TEMPERATURES: October 1980 to September 1981.
GAGE.--Water-stage recorder. Datum of gage is 218.63 ft above sea level.
REMARKS.--No estimated daily discharges. Records good. Flow regulated by powerplants and by First Connecticut and
Second Connecticut Lakes, Lake Francis, Moore and Comerford Reservoirs (Reservoirs in Connecticut River Basin), and
other reservoirs, combined usable capacity, about 24.8 billion ft³.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1750, 43.8 ft, March 19, 1936, from floodmarks.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 54,300 ft³/s, December 3, gage height, 21.11 ft; minimum daily discharge,
1,830 ft³/s, August 7.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 3390 7540 8410 12400 7670 20000 25800 25000 8540 5510 3000 5700
2 2380 7880 30600 11000 6050 16800 23000 27800 9500 4170 1850 6170
3 2270 7640 49900 12300 6620 20500 20700 31200 10800 3320 2240 5050
4 2600 7050 38400 14000 6780 19000 21500 36500 8730 4940 2170 4830
5 2070 6660 29000 13300 7030 18100 25100 30800 7870 4880 1960 3900
6 1990 5510 22700 12300 6550 15100 30100 25100 7720 4200 2170 4230
7 1940 6050 14900 13400 6260 16700 44300 24000 4420 4590 1830 4300
8 4150 8280 14500 12000 6950 13700 51600 24100 5160 5140 1950 4150
9 3860 15500 12600 10600 5590 12700 44300 22300 5090 5560 2260 3750
10 4500 30700 13000 10300 5620 13000 33300 19700 5170 4820 2630 2810
11 5570 23200 13000 10600 5850 13100 23200 19900 4810 5510 2300 3150
12 5490 15500 12500 11500 5770 13200 19600 18200 4430 7650 2140 3200
13 4530 11500 12300 9770 5550 12000 22700 17600 2780 5000 2390 3680
14 3460 10500 12700 7640 6220 11000 22900 17400 5060 5370 6350 3630
15 3570 9280 12200 8680 5980 8930 18300 16500 5530 7470 7760 3700
16 4030 6050 12100 8500 5450 6490 18300 16300 5370 19300 4960 3550
17 3480 6930 12400 8760 4420 8380 20700 17700 4710 15500 4820 3420
18 3220 6090 16100 8910 4400 7880 26600 17600 5240 9810 4380 2600
19 3620 7340 22800 7250 5550 8990 49100 17600 7420 9810 4200 3010
20 4520 8010 19600 6600 7060 8220 49200 19800 11400 6700 3120 2120
21 24700 7000 16300 6620 8800 8940 45300 17300 9400 7010 5060 2840
22 43400 6890 13100 8150 12400 8500 41000 13800 6550 4960 6980 3900
23 28900 6590 12900 9240 23100 6080 31800 13500 9260 3550 9420 3330
24 17500 5500 13200 9010 15700 5530 27100 13700 10100 2540 7930 2760
25 16900 6950 29800 8810 12000 5620 25400 13900 10600 2950 7590 3150
26 13400 7690 24200 9410 9900 7890 26100 14200 8300 2300 4820 3020
27 12000 8260 22600 8960 12500 10500 24200 12300 5780 2050 3490 2520
28 10800 8430 18000 7230 19500 12200 28200 13200 5560 2820 5820 2720
29 7970 4740 17700 7250 --- 14400 35900 10200 4610 3690 7060 2490
30 7340 4570 17400 8220 --- 20000 30600 9970 3800 2310 8020 2740
31 7110 --- 17200 7790 --- 26800 --- 7840 --- 2640 6870 ---
TOTAL 260660 273830 582110 300500 235270 390250 905900 585010 203710 176070 137540 106420
MEAN 8408 9128 18780 9694 8403 12590 30200 18870 6790 5680 4437 3547
MAX 43400 30700 49900 14000 23100 26800 51600 36500 11400 19300 9420 6170
MIN 1940 4570 8410 6600 4400 5530 18300 7840 2780 2050 1830 2120
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1942 - 1997, BY WATER YEAR (WY)
MEAN 6312 8693 8535 6976 7101 13400 27240 16670 8024 4567 3949 3747
MAX 18300 18420 22550 17930 21810 34150 45630 33380 20600 18930 12990 14820
(WY) 1978 1960 1984 1996 1981 1979 1969 1972 1947 1973 1990 1954
MIN 1424 2886 2124 1866 2736 4532 7803 6477 3276 1845 1461 1555
(WY) 1949 1948 1948 1948 1980 1956 1995 1965 1963 1965 1942 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1942 - 1997
ANNUAL TOTAL 5420310 4157270
ANNUAL MEAN 14810 11390 9602
HIGHEST ANNUAL MEAN 14630 1996
LOWEST ANNUAL MEAN 4991 1965
HIGHEST DAILY MEAN 64800 May 13 51600 Apr 8 88300 Mar 28 1953
LOWEST DAILY MEAN 1510 Sep 2 1830 Aug 7 a 115 Aug 31 1952
ANNUAL SEVEN-DAY MINIMUM 2070 Sep 2 2020 Aug 2 777 Aug 7 1970
INSTANTANEOUS PEAK FLOW 54300 Dec 3 97000 Mar 27 1953
INSTANTANEOUS PEAK STAGE 21.11 Dec 3 30.37 Mar 27 1953
10 PERCENT EXCEEDS 34800 24200 21400
50 PERCENT EXCEEDS 10800 8010 6200
90 PERCENT EXCEEDS 3170 3010 2000
a Also occurred on September 2, 1957.
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