CONNECTICUT RIVER BASIN
01158600 OTTER BROOK BELOW OTTER BROOK DAM NEAR KEENE, NH
LOCATION.--Lat 42°56'45", long 72°14'14", Cheshire County, Hydrologic Unit 01080201, on right bank, 450 ft downstream
from Otter Brook Dam, 2.4 mi northeast of Keene, 2.4 mi upstream from Minnewawa Brook, and 4.9 mi upstream from
mouth.
DRAINAGE AREA.--47.2 mi².
PERIOD OF RECORD.--Discharge records: May 1958 to September 1989, October 1995 to current year. Annual maximums and
measurements, water years 1990-95.
GAGE.--Water-stage recorder and concrete control. Datum of gage is 658.65 ft above sea level (levels by U.S. Army
Corps of Engineers). Prior to September 29, 1933, nonrecording gage on highway bridge at same datum.
REMARKS.--Records good. Flow regulated by Otter Brook Lake (Reservoirs in Connecticut River Basin).
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 614 ft³/s, December 3, gage height, 8.42 ft; minimum daily discharge,
2.0 ft³/s, August 4.
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 15 62 105 222 46 142 351 137 44 2.8 2.3 6.8
2 12 56 132 158 46 141 381 148 43 2.6 2.1 5.8
3 10 50 441 133 46 142 351 153 39 2.7 2.1 5.3
4 8.2 45 573 134 46 140 290 270 33 3.2 2.0 4.7
5 7.0 41 535 134 46 136 235 214 31 3.6 2.2 4.3
6 6.4 38 377 136 47 135 250 151 27 3.7 2.5 3.7
7 5.9 37 220 137 47 134 404 151 24 3.9 2.7 3.6
8 6.0 46 215 113 47 131 502 116 23 4.2 2.7 3.9
9 27 157 209 79 47 127 489 99 21 6.0 2.7 4.0
10 43 383 163 70 64 92 448 95 19 36 2.6 4.3
11 41 459 114 71 71 67 305 98 17 28 2.5 4.4
12 31 360 104 71 55 64 191 101 15 17 2.6 6.2
13 25 202 106 70 46 47 196 80 14 12 2.7 8.2
14 28 114 108 52 36 41 205 64 13 8.9 4.4 8.7
15 27 94 110 45 31 41 207 76 11 7.9 5.9 8.0
16 22 82 157 46 31 42 206 108 9.3 8.6 5.6 6.9
17 20 96 175 66 31 42 270 101 8.4 8.0 7.6 5.8
18 23 88 308 76 31 42 259 89 8.9 5.8 11 5.2
19 25 81 298 73 31 42 272 86 13 4.8 9.4 4.6
20 35 74 265 71 42 42 349 163 12 4.4 6.8 4.6
21 322 66 322 51 48 42 454 145 10 4.1 6.3 4.8
22 500 59 314 43 50 97 504 112 8.1 4.2 7.2 4.3
23 491 54 298 44 55 105 514 96 6.9 4.1 8.4 3.9
24 459 49 237 44 236 43 471 84 5.9 3.9 8.0 3.5
25 313 47 241 44 303 43 409 78 5.8 3.6 6.9 3.2
26 176 99 454 44 250 68 259 73 5.0 3.4 6.0 3.1
27 140 168 512 45 176 121 175 65 4.6 3.3 5.3 3.0
28 90 116 465 46 141 158 174 59 4.0 3.1 4.7 2.8
29 81 92 336 46 --- 173 199 53 3.6 2.8 8.8 3.1
30 70 77 272 46 --- 185 161 48 3.2 2.5 9.7 3.5
31 69 --- 254 46 --- 284 --- 46 --- 2.4 8.2 ---
TOTAL 3128.5 3392 8420 2456 2146 3109 9481 3359 482.7 211.5 161.9 144.2
MEAN 101 113 272 79.2 76.6 100 316 108 16.1 6.82 5.22 4.81
MAX 500 459 573 222 303 284 514 270 44 36 11 8.7
MIN 5.9 37 104 43 31 41 161 46 3.2 2.4 2.0 2.8
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1958 - 1989, 1996, 1997 BY WATER YEAR (WY)
MEAN 47.7 76.9 81.4 63.8 72.3 131 257 121 57.5 28.3 21.5 22.1
MAX 158 242 272 185 223 368 447 256 312 120 157 103
(WY) 1978 1996 1997 1978 1984 1979 1987 1969 1984 1973 1986 1960
MIN .86 3.20 12.8 8.97 14.3 29.8 88.6 40.2 3.78 2.65 2.21 .77
(WY) 1965 1965 1965 1981 1965 1965 1985 1964 1964 1965 1963 1964
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1907 - 1989, 1996 - 1997
ANNUAL TOTAL 45033.4 36491.8
ANNUAL MEAN 123 100 81.7
HIGHEST ANNUAL MEAN 126 1960
LOWEST ANNUAL MEAN 23.2 1965
HIGHEST DAILY MEAN 644 Jan 31 573 Dec 4 685 Apr 10 1987
LOWEST DAILY MEAN 1.8 Sep 7 2.0 Aug 4 .30 Sep 27 1964
ANNUAL SEVEN-DAY MINIMUM 1.9 Sep 2 2.2 Jul 30 .30 Oct 12 1964
INSTANTANEOUS PEAK FLOW 614 Dec 3 a 752 Apr 9 1987
INSTANTANEOUS PEAK STAGE 8.42 Dec 3 8.62 Apr 9 1987
10 PERCENT EXCEEDS 378 293 212
50 PERCENT EXCEEDS 59 46 40
90 PERCENT EXCEEDS 6.0 3.7 5.9
a Includes bypass flow around gage.
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