CONNECTICUT RIVER BASIN
01131500 CONNECTICUT RIVER NEAR DALTON, NH
LOCATION.--Lat 44°24'36", long 71°43'16", Coos County, Hydrologic Unit 01080101, on left bank, 250 ft upstream from
highway bridge, 1,200 ft downstream from dam of Gilman Paper Co., 1.2 mi downstream from Dalton, and at mile 300.1.
DRAINAGE AREA.--1,514 mi².
PERIOD OF RECORD.--Discharge records: March 1927 to current year. Published as "at Waterford, VT" 1927-35. Records
published for both sites January to September 1935.
Water-quality records: Water years 1953, 1971, 1994-95.
REVISED RECORDS.--WSP 891: Drainage area. WSP 1231: 1935. WSP 1301: 1928-35(M).
GAGE.--Water-stage recorder. Datum of gage is 799.89 ft above sea level. Prior to September 30, 1935, nonrecording
gage at bridge 10.5 mi downstream at mean sea level. January 1, 1935, to June 29, 1937, nonrecording gage at
bridge 250 ft downstream at present datum. Since June 2, 1961, auxiliary water-stage recorder 10.8 mi downstream
from base gage. July 11, 1956, to June 1, 1961, auxiliary nonrecording gage read hourly at same site.
REMARKS.--Records fair except those for estimated daily discharges and for period July 22 to August 21, which are poor.
Flow regulated by powerplants and by First Connecticut and Second Connecticut Lakes, Lake Francis (Reservoirs in
Connecticut River Basin), and other reservoirs. These reservoirs have a combined usable capacity of about
8.3 billion ft³.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 15,100 ft³/s, April 8, gage height, 16.22 ft; minimum daily discharge,
582 ft³/s, October 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 1330 e2000 1390 2650 1880 3890 6370 7480 3700 1800 787 2160
2 952 e1800 5720 2330 1810 3890 5540 10100 3620 1320 817 1880
3 766 e1600 14000 2670 1880 5420 4960 11900 3330 1400 867 1660
4 696 e1400 13500 2980 1810 5960 4820 10100 2700 2680 956 2170
5 721 e1350 7690 3080 1760 5080 4670 7620 2520 3400 1030 1870
6 607 e1350 4890 3760 1770 4230 6040 6290 2340 2630 916 1440
7 582 e1450 4000 4500 1780 3680 10200 7080 2140 1520 792 1210
8 602 e1500 3920 3940 1780 3130 13500 7620 1830 1670 744 1150
9 792 e1650 3590 3020 1650 2840 12600 6590 1680 1760 752 1040
10 1680 e2500 3510 2590 1630 2690 7780 6300 1540 4800 787 1010
11 2110 e3000 3200 2670 1580 2770 5550 6500 1410 4150 730 844
12 2060 e2400 2920 2690 1750 2770 4950 6100 1500 2700 950 931
13 1540 e2000 2750 2520 1710 2530 4590 5980 1820 2240 1310 935
14 1240 e1700 2500 2370 1700 2320 4480 6390 2710 2450 2890 897
15 995 e1500 2670 2430 1520 1800 4420 5920 2700 5060 3210 874
16 e940 e1300 2690 2420 1670 2310 4310 6000 1910 5500 1780 755
17 e870 e1250 2680 2790 1710 2340 5000 6630 1560 3700 1500 807
18 e810 e1350 3320 3050 1600 2180 6920 6520 1600 2760 1800 811
19 e760 e1300 4880 2760 1670 2230 12200 5840 3090 2080 1370 811
20 e730 e1280 4920 2510 1910 2090 12300 5770 3880 1820 1080 718
21 e1350 e1250 3910 2280 2450 1970 10400 5690 2320 1710 1080 992
22 e5000 e1220 2550 2230 2850 1860 9290 5590 4160 1500 1590 1420
23 e6100 e1150 3290 2210 5560 1840 8590 6130 6710 1360 3430 1180
24 e5400 e1120 3480 2380 6180 1720 8540 6260 4920 1220 3610 980
25 e3350 e1100 6510 2270 5040 1630 7820 5570 3420 1210 2840 1130
26 e2300 e1050 6910 2310 4200 1810 7030 5260 3590 1060 2010 1140
27 e1950 e1000 5050 2310 3700 2310 7330 5010 3520 1080 1590 1090
28 e1750 1250 4670 1970 3910 2530 7870 4480 2910 1010 2970 1040
29 e1550 1180 4360 2030 --- 2670 9010 3850 2290 1140 3500 1040
30 e1500 1140 4750 1990 --- 4540 8110 3640 2030 1040 3730 1340
31 e1600 --- 4110 1790 --- 6640 --- 3600 --- 959 3040 ---
TOTAL 52633 45140 144330 81500 68460 93670 225190 197810 83450 68729 54458 35325
MEAN 1698 1505 4656 2629 2445 3022 7506 6381 2782 2217 1757 1178
MAX 6100 3000 14000 4500 6180 6640 13500 11900 6710 5500 3730 2170
MIN 582 1000 1390 1790 1520 1630 4310 3600 1410 959 730 718
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1927 - 1997, BY WATER YEAR (WY)
MEAN 2191 2879 2504 2088 1813 2892 7769 5593 2489 1555 1422 1514
MAX 6129 7331 5786 4321 6093 12140 15380 11890 5915 5059 3662 7140
(WY) 1978 1928 1974 1996 1981 1936 1934 1972 1947 1996 1976 1954
MIN 654 1066 860 751 533 482 2631 1951 1030 654 406 654
(WY) 1949 1948 1948 1948 1940 1940 1995 1941 1988 1955 1942 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1927 - 1997
ANNUAL TOTAL 1467473 1150695
ANNUAL MEAN 4009 3153 2897
HIGHEST ANNUAL MEAN 4203 1996
LOWEST ANNUAL MEAN 1934 1995
HIGHEST DAILY MEAN 29500 Apr 25 14000 Dec 3 46500 Mar 20 1936
LOWEST DAILY MEAN 461 Sep 24 582 Oct 7 115 Oct 3 1937
ANNUAL SEVEN-DAY MINIMUM 523 Sep 20 681 Oct 3 265 Sep 8 1957
INSTANTANEOUS PEAK FLOW 15100 Apr 8 48300 Mar 20 1936
INSTANTANEOUS PEAK STAGE 16.22 Apr 8 25.60 Mar 20 1936
10 PERCENT EXCEEDS 8850 6380 6100
50 PERCENT EXCEEDS 2640 2320 1860
90 PERCENT EXCEEDS 948 987 810
e Estimated.
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