CONNECTICUT RIVER BASIN
01152500 SUGAR RIVER AT WEST CLAREMONT, NH
LOCATION.--Lat 43°23'15", long 72°21'45", Sullivan County, Hydrologic Unit 01080104, on right bank, 0.2 mi downstream
from Redwater Brook at West Claremont, and 2.4 mi upstream from mouth.
DRAINAGE AREA.--269 mi².
PERIOD OF RECORD.--Discharge records: May 1928 to current year. Published as "at Claremont" prior to October 1928.
Water-quality records: Water year 1954, 1995-96
REVISED RECORDS.--WSP 711: 1930(M). WSP 756: Drainage area. WSP 1901: 1960 (adjusted figures only).
GAGE.--Water-stage recorder. Datum of gage is 358.78 ft above sea level (levels by U.S. Army Corps of Engineers).
Prior to October 1, 1928, nonrecording gage at site 0.8 mi upstream at different datum.
REMARKS.--Records good except those for estimated daily discharges, which are fair. Regulation by Sunapee Lake 25 mi
upstream (Reservoirs in Connecticut River Basin) and occasional diurnal fluctuation at low flow by mills upstream;
greater regulation by mills prior to 1971.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,000 ft³/s, March 19, 1936, gage height, 10.92 ft, from rating
curve extended above 6,700 ft³/s on basis of computations of flow over dam at gage heights 10.49 ft and 10.93 ft;
maximum gage height, 11.80 ft, March 12, 1936 (ice jam); minimum daily discharge, 14 ft³/s, August 26, 1965.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 1845 5,520 6.90 Feb. 22 2400 4,820 6.48
Dec. 2 1645 4,230 6.06 Apr. 19 1545 * 5,730 * 7.02
Dec. 25 0730 3,130 5.21
Minimum daily discharge, 35 ft³/s, August 11, 20.
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 79 407 634 926 e330 1010 1270 1170 236 40 46 84
2 62 378 3160 876 e325 812 1030 1200 295 40 43 73
3 52 354 2580 806 e325 880 831 1090 248 64 41 82
4 46 332 1640 727 e320 678 999 1350 214 128 41 76
5 42 325 1220 712 e320 546 1290 1170 188 92 46 65
6 40 314 980 822 e310 e570 1690 967 165 70 42 62
7 41 310 830 714 e310 e530 2310 1230 150 61 39 55
8 42 335 769 578 e300 e480 2350 968 139 55 41 54
9 113 1650 e680 529 e290 e430 1520 881 127 63 37 52
10 196 1920 e650 e540 e290 e400 1110 857 118 101 36 48
11 266 1280 632 513 e280 e385 968 762 108 97 35 47
12 197 962 632 516 e270 e365 884 659 104 78 36 54
13 144 727 728 481 e260 e330 1120 575 125 65 52 52
14 116 590 704 e450 e250 e380 1210 515 109 59 71 51
15 129 500 701 467 e250 e380 1090 484 96 70 50 48
16 115 436 728 460 e245 e360 1040 452 88 101 48 51
17 107 411 784 e460 e270 345 1120 416 77 153 44 55
18 98 400 1330 e455 e320 354 1910 382 78 161 46 54
19 95 400 1510 e450 496 346 5190 398 127 171 36 51
20 491 411 1380 e440 904 337 3730 562 130 134 35 50
21 4270 398 e900 e435 862 318 2560 485 107 119 60 45
22 3270 382 e800 e420 e1900 316 2130 424 87 110 63 43
23 1880 360 e720 e480 e2800 301 1880 381 75 100 59 42
24 1330 345 831 e500 e1300 291 1650 343 67 95 51 42
25 968 330 2610 e460 1050 287 1440 323 62 89 46 41
26 706 575 1540 e440 837 493 1270 308 58 82 44 42
27 562 812 1210 e400 983 645 1160 280 54 81 50 42
28 485 568 977 e380 1560 704 1300 227 52 75 75 39
29 456 512 1020 e360 --- e930 1540 218 48 43 96 56
30 422 452 1530 e340 --- 1320 1300 197 44 43 118 49
31 440 --- 1110 e340 --- 1610 --- 194 --- 46 104 ---
TOTAL 17260 17176 35520 16477 17957 17133 48892 19468 3576 2686 1631 1605
MEAN 557 573 1146 532 641 553 1630 628 119 86.6 52.6 53.5
MAX 4270 1920 3160 926 2800 1610 5190 1350 295 171 118 84
MIN 40 310 632 340 245 287 831 194 44 40 35 39
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1928 - 1997, BY WATER YEAR (WY)
MEAN 217 350 366 320 330 667 1292 652 310 174 137 129
MAX 895 917 1146 1090 1343 2490 2746 1657 818 711 952 1269
(WY) 1976 1996 1997 1978 1981 1936 1969 1940 1940 1973 1990 1938
MIN 39.2 66.9 92.9 84.7 74.5 108 359 179 67.5 26.2 29.4 44.7
(WY) 1984 1972 1948 1948 1942 1940 1995 1965 1965 1965 1965 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1928 - 1997
ANNUAL TOTAL 244653 199381
ANNUAL MEAN 668 546 411
HIGHEST ANNUAL MEAN 660 1976
LOWEST ANNUAL MEAN 139 1965
HIGHEST DAILY MEAN 4660 Apr 17 5190 Apr 19 11200 Mar 19 1936
LOWEST DAILY MEAN 35 Sep 16 a 35 Aug 11 14 Aug 26 1965
ANNUAL SEVEN-DAY MINIMUM 37 Sep 11 38 Aug 6 21 Aug 22 1965
INSTANTANEOUS PEAK FLOW 5730 Apr 19 b 14000 Mar 19 1936
INSTANTANEOUS PEAK STAGE 7.02 Apr 19 c 11.80 Mar 12 1936
10 PERCENT EXCEEDS 1660 1300 986
50 PERCENT EXCEEDS 380 345 209
90 PERCENT EXCEEDS 53 46 69
a Also occurred on August 20.
b From rating curve extended above 6,700 ft³/s as explained above.
c Ice jam.
e Estimated.
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