CONNECTICUT RIVER BASIN
01158000 ASHUELOT RIVER BELOW SURRY MOUNTAIN DAM, NEAR KEENE, NH
LOCATION.--Lat 42°59'45", long 72°18'40", Cheshire County, Hydrologic Unit 01080201, on right bank, 600 ft downstream
from Surry Mountain Dam, 2.5 mi upstream from Sturtevant Brook, 4.5 mi north of Keene, and at mile 34.0.
DRAINAGE AREA.--101 mi².
PERIOD OF RECORD.--Discharge records: September 1945 to September 1989, October 1995 to current year. Annual maximums
and measurements, water years 1990-95.
GAGE.--Water-stage recorder and concrete control. Elevation of gage is 480.00 ft above sea level (levels by U.S. Army
Corps of Engineers).
REMARKS.--Records good except those for estimated daily discharges, December 31, January 1-3, 8-11, 13-15, 18-31,
February 1, 2, 6, March 16, 17, and May 15-30, which are fair, and period of estimated daily record, July 9-15,
August 23-28, which are poor. Flow regulated by Surry Mountain Dam (Reservoirs in Connecticut River Basin).
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 1,070 ft³/s, April 8, gage height, 8.57 ft; minimum daily discharge,
5.3 ft³/s, August 11.
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 38 204 149 e415 e108 371 768 592 92 11 7.7 16
2 32 193 367 e327 e108 347 834 454 89 9.9 6.9 16
3 31 180 723 e303 107 345 647 408 86 11 6.2 16
4 28 164 833 275 107 317 507 497 80 23 5.5 15
5 27 149 835 254 107 280 589 509 73 54 6.4 13
6 26 137 801 277 e107 301 648 436 66 54 6.9 13
7 25 129 760 e283 107 300 880 460 60 46 7.0 12
8 25 141 699 e264 107 252 1020 418 54 40 6.5 13
9 39 368 393 e228 107 217 1000 358 49 e52 6.2 12
10 60 706 275 e202 105 206 945 323 45 e142 5.7 12
11 78 805 271 e200 74 199 780 297 40 e105 5.3 12
12 74 766 265 182 61 179 513 265 35 e73 5.5 13
13 65 706 267 e142 62 151 501 235 32 e64 6.5 16
14 57 499 272 e131 62 136 563 217 30 e53 11 18
15 50 331 272 e134 62 131 532 e207 26 e43 13 19
16 44 272 272 134 62 e142 484 e231 23 37 14 20
17 41 244 274 136 62 e142 459 e241 21 40 18 19
18 39 228 556 e138 62 129 498 e243 21 39 18 18
19 38 219 718 e138 63 123 609 e221 27 36 16 16
20 52 211 686 e136 93 121 771 e241 27 29 14 16
21 373 200 678 e129 108 116 829 e300 26 24 14 17
22 739 185 616 e119 110 121 831 e281 24 22 19 17
23 837 171 409 e110 117 117 818 e256 20 18 e20 17
24 828 146 336 e107 456 108 799 e243 19 17 e20 16
25 786 106 365 e105 576 106 794 e221 18 16 e17 15
26 712 111 605 e107 501 155 770 e192 18 14 e16 14
27 453 217 698 e107 346 265 766 e146 16 13 e15 13
28 289 215 675 e108 350 290 756 e129 14 12 e14 12
29 241 173 639 e108 --- 364 728 e121 13 11 14 13
30 217 137 611 e108 --- 438 694 e107 12 9.5 16 14
31 210 --- e548 e108 --- 639 --- 97 --- 8.5 15 ---
TOTAL 6554 8313 15868 5515 4297 7108 21333 8946 1156 1126.9 366.3 453
MEAN 211 277 512 178 153 229 711 289 38.5 36.4 11.8 15.1
MAX 837 805 835 415 576 639 1020 592 92 142 20 20
MIN 25 106 149 105 61 106 459 97 12 8.5 5.3 12
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1945 - 1989, 1997, BY WATER YEAR (WY)
MEAN 102 165 181 149 156 272 558 290 129 53.9 39.7 49.6
MAX 453 577 512 383 423 661 1022 632 634 229 334 233
(WY) 1978 1996 1997 1978 1981 1979 1960 1956 1984 1973 1986 1960
MIN 4.39 4.04 22.7 21.2 28.1 88.5 167 90.6 13.5 5.77 4.88 9.63
(WY) 1965 1965 1965 1981 1980 1956 1946 1986 1964 1965 1965 1957
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1945 - 1989, 1996 - 1997
ANNUAL TOTAL 98580.1 81036.2
ANNUAL MEAN 269 222 178
HIGHEST ANNUAL MEAN 279 1960
LOWEST ANNUAL MEAN 57.3 1965
HIGHEST DAILY MEAN 1030 Jan 31 1020 Apr 8 2150 Apr 7 1987
LOWEST DAILY MEAN 3.3 Sep 4 5.3 Aug 11 .40 Sep 17 1964
ANNUAL SEVEN-DAY MINIMUM 3.7 Sep 1 6.1 Aug 7 .67 Aug 1 1965
INSTANTANEOUS PEAK FLOW 1070 Apr 8 2260 Apr 7 1987
INSTANTANEOUS PEAK STAGE 8.57 Apr 8 a 11.78 Apr 7 1987
10 PERCENT EXCEEDS 779 681 526
50 PERCENT EXCEEDS 136 121 88
90 PERCENT EXCEEDS 15 14 14
a From floodmarks.
e Estimated.
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