CONNECTICUT RIVER BASIN
01161000 ASHUELOT RIVER AT HINSDALE, NH
LOCATION.--Lat 42°47'07", long 72°29'12", Cheshire County, Hydrologic Unit 01080201, on left bank, 40 ft upstream from
highway bridge at Hinsdale, 0.2 mi downstream from dam, and 1.2 mi upstream from mouth.
DRAINAGE AREA.--420 mi².
PERIOD OF RECORD.--Discharge records: March 1907 to December 1911, July 1914 to current year.
Water-quality records: Water years 1953, 1958, 1968, 1994.
REVISED RECORDS.--WSP 661: Drainage area. WSP 781: 1907- 10, 1914-34. WSP 1301: 1915(M), 1917-19(M),1921-33(M).
WSP 1701: 1920.
GAGE.--Water-stage recorder. Datum of gage is 201.32 ft above sea level (levels by U.S. Army Corps of Engineers).
Prior to Sep. 29, 1933, nonrecording gage on highway bridge at same datum.
REMARKS.--Records good except those for estimated daily discharges and those below 300 ft³/s, which are fair. Flow
regulated by Surry Mountain Lake 33 mi upstream since 1942 and by Otter Brook Lake 29 mi upstream on Otter Brook
since 1958 (Reservoirs in Connecticut River Basin). Regulation by small hydro plants upstream.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 16,600 ft³/s, March 19, 1936, by computation of peak flow over dam;
maximum gage height, 20.2 ft, March 19, 1936, from floodmarks (backwater from the Connecticut River); minimum daily
discharge, 12 ft³/s, September 15, 1929. Maximum discharge since at least 1859, that of March 19, 1936.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 4,250 ft³/s, December 2, gage height, 7.17 ft; minimum daily discharge,
62 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
1 207 520 779 1630 e419 1380 2710 1850 404 85 74 99
2 175 469 2920 1460 e400 1280 2550 1690 394 80 67 93
3 152 439 3970 1310 e394 1280 2450 1600 370 95 66 94
4 139 410 3490 1240 e376 1190 2350 2020 338 246 64 104
5 125 400 2960 1200 e489 1070 2400 2090 313 207 75 122
6 98 370 2590 1280 e664 1330 2500 1830 288 175 81 110
7 102 355 2220 1270 e626 1470 2620 1830 265 160 84 102
8 101 422 1920 1060 e531 1180 2920 1680 248 187 71 108
9 212 1350 1840 e895 e455 e960 2940 1430 232 248 67 106
10 451 2660 1450 e836 e430 e843 2640 1300 217 941 63 101
11 523 2660 1160 784 e418 e739 2350 1220 203 958 62 89
12 444 2340 1110 e699 e351 e690 1990 1110 189 551 73 95
13 352 1930 1430 e632 e307 e613 1940 997 183 348 86 112
14 292 1550 1520 e511 e266 e487 2030 891 172 271 139 116
15 250 1150 1470 e477 e297 e592 1880 827 164 220 135 107
16 223 912 1460 e589 e275 e559 1660 853 148 205 121 101
17 176 810 1620 e662 e270 e477 1530 908 136 192 168 106
18 166 763 2350 e696 e282 e485 1660 851 133 192 153 99
19 163 731 3010 e555 e294 e460 2420 806 161 177 144 95
20 234 712 3280 e472 e434 e459 3230 1170 165 151 123 102
21 624 662 2860 e427 e559 e436 3180 1340 155 140 134 120
22 1590 622 2430 e402 1200 e549 2810 1110 141 127 186 116
23 1860 591 2090 e444 1750 e559 2530 950 126 118 181 108
24 1850 548 1820 e379 1470 e430 2340 832 116 109 159 99
25 1740 506 2570 e481 1490 e412 2170 754 116 104 141 94
26 1480 637 2700 e597 1510 e846 2010 707 116 100 124 88
27 1250 1210 2580 e496 1420 1390 1780 635 116 94 110 89
28 886 1140 2390 e471 1420 1550 1820 563 109 90 111 96
29 707 895 2230 e468 --- 1870 2250 503 100 87 104 103
30 611 729 2200 e428 --- 2270 2170 457 91 81 113 106
31 557 --- 2070 e428 --- 2640 --- 429 --- 78 109 ---
TOTAL 17740 28493 68489 23279 18797 30496 69830 35233 5909 6817 3388 3080
MEAN 572 950 2209 751 671 984 2328 1137 197 220 109 103
MAX 1860 2660 3970 1630 1750 2640 3230 2090 404 958 186 122
MIN 98 355 779 379 266 412 1530 429 91 78 62 88
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1907 - 1911, 1914 - 1997, BY WATER YEAR (WY)
MEAN 346 596 666 605 604 1229 1896 1002 508 276 226 238
MAX 1474 2248 2209 1539 2016 4392 3723 2175 2075 1182 1098 2394
(WY) 1976 1928 1997 1978 1984 1936 1960 1945 1984 1915 1990 1938
MIN 49.2 55.4 113 84.0 113 273 597 335 96.9 60.8 50.5 53.0
(WY) 1965 1965 1915 1981 1980 1940 1985 1985 1964 1965 1966 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1907 - 1911, 1914 - 1997
ANNUAL TOTAL 393993 311551
ANNUAL MEAN 1076 854 682
HIGHEST ANNUAL MEAN 1093 1960
LOWEST ANNUAL MEAN 216 1965
HIGHEST DAILY MEAN 5240 Apr 17 3970 Dec 3 16500 Mar 19 1936
LOWEST DAILY MEAN 41 Sep 7 62 Aug 11 12 Sep 15 1929
ANNUAL SEVEN-DAY MINIMUM 50 Sep 5 72 Aug 6 32 Aug 16 1966
INSTANTANEOUS PEAK FLOW 4250 Dec 2 a 16600 Mar 19 1936
INSTANTANEOUS PEAK STAGE 7.17 Dec 2 b 20.20 Mar 19 1936
10 PERCENT EXCEEDS 2780 2260 1720
50 PERCENT EXCEEDS 634 489 373
90 PERCENT EXCEEDS 100 100 97
a By computation of peak flow over dam from floodmarks (backwater from Connecticut River).
b From floodmarks.
e Estimated.
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