CONNECTICUT RIVER BASIN
01129440 MOHAWK RIVER NEAR COLEBROOK, NH
LOCATION.--Lat 44°52'28", Long 71°24'38", Coos County, Hydrologic Unit 01080101, on right bank, upstream of Bungy Road
Bridge, south of the intersection of State Highway 26 and Bungy Road, 0.8 mi upstream of Read Brook, 1.7 mi
downstream of Roaring Brook, 5 mi east of Colebrook, and 5.5 mi west of Dixville Notch.
DRAINAGE AREA.--36.7 mi².
PERIOD OF RECORD.--Discharge records: October 1986 to current year.
GAGE.--Water-stage recorder and crest stage gage. Elevation of gage is 1,220 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Dec. 2 0945 * 3,370 * 8.14 May 1 2230 1,500 7.16
Apr. 7 1730 921 6.64 June 21 2130 708 6.37
Apr. 18 2045 554 6.12 July 9 1200 1,180 6.90
Minimum discharge, 9.2 ft³/s, October 8, 9.
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 13 44 100 e39 e27 50 76 408 61 23 15 47
2 11 37 1210 e49 e27 138 68 511 54 23 15 43
3 13 32 194 e55 e26 121 66 201 46 88 74 101
4 12 28 105 e50 e26 74 71 185 42 95 28 63
5 11 32 83 e51 e25 60 99 143 39 47 35 45
6 10 38 71 e82 e26 59 282 172 31 31 22 35
7 9.7 34 59 e54 e25 e46 544 222 28 26 18 32
8 9.3 34 63 e41 e24 e43 266 167 25 24 17 29
9 53 110 64 e40 e23 e43 131 164 23 329 17 26
10 37 92 53 e43 e23 e44 107 180 22 102 16 25
11 36 57 49 e39 e22 44 99 159 23 53 73 24
12 19 44 47 e36 e22 40 95 159 24 36 59 28
13 16 36 46 e35 e21 e36 96 166 73 34 115 24
14 15 34 46 e34 e21 e33 90 164 97 66 98 22
15 14 e36 45 e33 e21 e35 87 182 42 71 38 21
16 13 e38 45 e33 e20 e33 114 235 28 48 31 20
17 12 e37 70 e35 e20 e29 155 179 26 35 43 18
18 11 33 131 e31 e21 e29 304 138 38 30 27 17
19 11 30 101 e31 e27 e28 339 133 101 28 22 16
20 11 29 75 e29 e42 e28 229 122 48 33 19 36
21 47 27 66 e28 e39 e30 198 118 165 26 22 38
22 252 25 e60 e28 e170 29 186 171 327 25 44 22
23 124 24 e55 e32 e140 e25 186 163 120 23 53 27
24 77 26 120 e31 e100 e29 175 115 70 21 31 28
25 52 e26 195 e30 e70 e27 160 102 62 20 23 20
26 38 28 e81 e31 e58 42 181 98 62 19 22 19
27 30 e30 e72 e30 50 35 186 86 43 19 21 19
28 46 e27 63 e29 58 36 312 72 35 20 67 17
29 45 e25 104 e28 --- 103 201 67 30 21 116 22
30 40 e22 105 e27 --- 175 197 64 26 18 131 30
31 61 --- 68 e26 --- 102 --- 64 --- 16 61 ---
TOTAL 1149.0 1115 3646 1160 1174 1646 5300 5110 1811 1450 1373 914
MEAN 37.1 37.2 118 37.4 41.9 53.1 177 165 60.4 46.8 44.3 30.5
MAX 252 110 1210 82 170 175 544 511 327 329 131 101
MIN 9.3 22 45 26 20 25 66 64 22 16 15 16
CFSM 1.01 1.01 3.20 1.02 1.14 1.45 4.81 4.49 1.64 1.27 1.21 .83
IN. 1.16 1.13 3.70 1.18 1.19 1.67 5.37 5.18 1.84 1.47 1.39 .93
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 1997, BY WATER YEAR (WY)
MEAN 60.2 71.3 58.8 49.7 34.8 79.6 209 104 52.7 39.0 36.6 30.3
MAX 122 110 127 134 109 156 344 177 73.1 108 93.3 53.2
(WY) 1991 1989 1991 1996 1996 1990 1996 1989 1990 1996 1988 1993
MIN 26.2 33.0 25.9 25.8 13.4 23.0 74.2 66.7 26.7 13.0 13.1 11.1
(WY) 1995 1995 1990 1994 1993 1994 1995 1988 1992 1991 1987 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1987 - 1997
ANNUAL TOTAL 37249.6 25848.0
ANNUAL MEAN 102 70.8 68.8
HIGHEST ANNUAL MEAN 104 1996
LOWEST ANNUAL MEAN 44.1 1995
HIGHEST DAILY MEAN 1640 Apr 24 1210 Dec 2 2110 Apr 1 1987
LOWEST DAILY MEAN 7.5 Sep 24 9.3 Oct 8 5.3 Sep 5 1995
ANNUAL SEVEN-DAY MINIMUM 8.5 Sep 18 11 Oct 2 5.8 Sep 1 1995
INSTANTANEOUS PEAK FLOW a 3370 Dec 2 a 7630 Apr 1 1987
INSTANTANEOUS PEAK STAGE 8.14 Dec 2 b 9.00 Jan 21 1996
INSTANTANEOUS LOW FLOW c 9.2 Oct 8 d 5.2 Sep 4 1995
ANNUAL RUNOFF (CFSM) 2.77 1.93 1.87
ANNUAL RUNOFF (INCHES) 37.76 26.20 25.47
10 PERCENT EXCEEDS 196 165 133
50 PERCENT EXCEEDS 54 39 40
90 PERCENT EXCEEDS 12 20 17
a From rating curve extended above 600 ft³/s.
b Ice jam.
c Also occurred October 9.
d Also occurred on September 5-7, 1996.
e Estimated.
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