CONNECTICUT RIVER BASIN
01137500 AMMONOOSUC RIVER AT BETHLEHEM JUNCTION, NH
LOCATION.--Lat 44°16'08", long 71°37'52, Grafton County, Hydrologic Unit 01080101, on left bank, 0.2 mi upstream from
Pierce Bridge and Bethlehem Junction, 0.8 mi upstream from unnamed tributary entering from left, 3 mi east of
Bethlehem, 3.4 mi downstream from Little River, and at mile 35.0.
DRAINAGE AREA.--87.6 mi².
PERIOD OF RECORD.-- Discharge records: August 1939 to current year.
Water-quality records: Water years 1967-74, 1992-95. Data published in Water Year 1996 for this station was in
error.
REVISED RECORDS.--WSP 1701: 1951(M), 1953-54(M).
GAGE.--Water-stage recorder. Datum of gage is 1,180.74 ft above sea level (levels by U.S. Army Corps of Engineers).
REMARKS.--Records good except those for periods of estimated daily discharges, which are fair.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,700 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 2015 * 5,360 * 8.67 Dec. 2 1100 4,090 7.71
Nov. 9 1615 3,800 7.49
Minimum discharge, 43 ft³/s, October 7, 8.
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 55 196 260 e130 e86 186 215 859 608 81 66 76
2 48 168 2340 e170 e87 334 176 1150 526 75 62 71
3 53 152 762 e190 e84 410 163 586 437 136 65 82
4 50 137 413 e170 e83 234 166 554 391 327 67 85
5 46 134 305 185 e82 190 186 428 349 168 60 76
6 44 130 253 303 87 174 422 496 322 121 63 64
7 43 128 220 209 82 141 935 734 304 106 53 60
8 43 250 209 151 77 127 664 486 286 104 50 73
9 116 2030 193 144 73 e120 340 465 278 97 48 63
10 121 928 173 156 77 134 259 457 311 170 61 57
11 157 483 160 137 73 127 229 444 327 128 50 55
12 98 347 153 e120 71 113 209 403 284 96 74 74
13 79 277 153 e115 68 103 204 486 303 85 87 71
14 70 230 148 e112 68 98 202 525 340 189 127 62
15 63 191 144 e110 70 116 190 509 227 711 76 56
16 58 168 136 e110 66 102 213 639 187 373 62 54
17 56 183 195 e115 64 97 277 588 169 219 57 51
18 53 174 477 e100 65 97 630 508 171 203 54 50
19 51 170 358 e97 e100 99 1540 500 533 459 48 50
20 52 159 263 e93 e200 93 696 631 300 285 46 54
21 2410 146 189 e90 125 88 543 542 241 202 52 67
22 2020 133 170 e89 e520 85 484 520 234 165 115 60
23 646 125 179 e100 485 e82 476 596 208 140 133 56
24 417 111 374 e96 229 e80 463 457 166 124 95 78
25 304 111 889 e93 144 84 382 470 147 110 80 66
26 236 133 336 e102 151 135 392 506 136 100 68 59
27 201 135 274 e99 179 145 437 406 119 91 64 57
28 219 104 229 e96 273 120 565 387 107 88 137 54
29 266 104 239 e92 --- 250 475 456 97 88 100 59
30 207 107 367 e90 --- 429 422 485 88 77 113 116
31 246 --- e180 e87 --- 298 --- 551 --- 70 87 ---
TOTAL 8528 7844 10741 3951 3769 4891 12555 16824 8196 5388 2320 1956
MEAN 275 261 346 127 135 158 419 543 273 174 74.8 65.2
MAX 2410 2030 2340 303 520 429 1540 1150 608 711 137 116
MIN 43 104 136 87 64 80 163 387 88 70 46 50
CFSM 3.14 2.98 3.96 1.45 1.54 1.80 4.78 6.20 3.12 1.98 .85 .74
IN. 3.62 3.33 4.56 1.68 1.60 2.08 5.33 7.14 3.48 2.29 .99 .83
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 1997, BY WATER YEAR (WY)
MEAN 158 220 168 118 106 184 514 517 203 105 94.7 96.5
MAX 416 524 590 438 712 691 896 1054 462 308 273 550
(WY) 1978 1960 1974 1996 1981 1953 1969 1940 1973 1996 1990 1954
MIN 34.1 59.0 44.9 30.9 31.9 47.3 176 221 91.5 39.0 34.0 32.5
(WY) 1948 1979 1948 1948 1980 1940 1995 1993 1953 1991 1961 1948
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1939 - 1997
ANNUAL TOTAL 115067 86963
ANNUAL MEAN 314 238 207
HIGHEST ANNUAL MEAN 323 1996
LOWEST ANNUAL MEAN 131 1995
HIGHEST DAILY MEAN 2800 Jan 20 2410 Oct 21 6300 Mar 27 1953
LOWEST DAILY MEAN 36 Sep 8 43 Oct 7 21 Sep 1 1968
ANNUAL SEVEN-DAY MINIMUM 40 Sep 2 47 Oct 2 24 Sep 8 1961
INSTANTANEOUS PEAK FLOW 5360 Oct 21 a 11300 Nov 12 1995
INSTANTANEOUS PEAK STAGE 8.67 Oct 21 b 12.34 Nov 12 1995
INSTANTANEOUS LOW FLOW c 43 Oct 7 16 Nov 14 1952
ANNUAL RUNOFF (CFSM) 3.59 2.72 2.37
ANNUAL RUNOFF (INCHES) 48.86 36.93 32.14
10 PERCENT EXCEEDS 728 502 461
50 PERCENT EXCEEDS 159 144 106
90 PERCENT EXCEEDS 51 60 45
a From rating curve extended above 4,100 ft³/s on basis of slope-area measurement of peak flow.
b From floodmarks in well.
c Also occurred on October 8.
e Estimated.
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