CONNECTICUT RIVER BASIN
01150500 MASCOMA RIVER AT MASCOMA, NH
LOCATION.--Lat 43°38'55", long 72°10'55", Grafton County, Hydrologic Unit 01080104, on left bank, at Mascoma, 100 ft
downstream from outlet of Mascoma Lake.
DRAINAGE AREA.--153 mi².
PERIOD OF RECORD.--Discharge records: August 1923 to present; August 1923 to Jan. 1993, at site 900 ft downstream and
different datum.
REVISED RECORDS.--WSP 726: Drainage area. WSP 801: 1925(M), WRD NH-VT-84-1: 1973(M).
GAGE.--Water-stage recorder. Elevation of gage is 755 ft above sea level, from topographic map.
REMARKS.--Records good except those for periods of estimated daily discharge and those above 400 ft³/s, which are fair.
Flow regulated by Mascoma and Crystal Lakes and Goose and Grafton Ponds (Reservoirs in Connecticut River Basin).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,840 ft³/s, March 19, 1936, gage height, 7.50 ft (at different
datum), from rating curve extended above 2,500 ft³/s on basis of computations of flow over dam at gage heights
6.85 ft. and 7.50 ft; minimum daily discharge, 2 ft³/s, February 3, 1939, September 1, 1940.
EXTREMES FOR CURENT YEAR.--Maximum discharge, 3,410 ft³/s, April 20, gage height, 9.08 ft; minimum daily discharge,
30 ft³/s, October 1-9.
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 30 344 e311 419 136 479 532 623 112 47 35 39
2 30 338 753 352 132 465 502 588 129 45 35 39
3 30 325 1770 316 110 440 350 573 150 44 35 39
4 30 218 1620 307 95 421 254 550 147 44 35 39
5 30 120 878 294 96 384 349 551 141 44 34 40
6 30 154 578 294 96 366 497 530 149 44 34 40
7 30 e170 554 292 96 333 686 579 133 44 34 39
8 30 e335 541 248 96 297 1460 708 125 44 34 39
9 30 e400 510 209 96 263 1470 677 120 43 34 39
10 31 e910 471 209 95 250 733 605 101 44 34 39
11 32 e1160 428 205 95 239 471 597 86 44 34 38
12 35 e925 554 197 94 233 648 568 85 44 34 38
13 40 e670 576 188 94 226 645 506 67 44 34 38
14 102 e540 466 181 94 227 506 476 50 44 34 38
15 174 e460 423 174 94 220 466 456 50 75 33 38
16 175 e420 382 175 93 208 496 333 50 117 33 38
17 175 e400 372 175 92 178 524 282 49 121 33 38
18 218 e390 421 172 91 154 702 324 49 102 33 38
19 264 e365 508 167 92 150 2410 343 50 96 33 38
20 263 e360 557 162 98 147 3240 338 55 94 33 37
21 773 e345 532 156 97 128 2350 333 56 94 33 38
22 2360 e320 462 156 104 104 1630 306 59 93 33 38
23 2280 e300 348 154 141 104 1310 283 54 74 32 38
24 1370 e280 315 152 205 104 925 267 49 59 31 38
25 714 e270 456 153 238 138 699 246 46 55 33 38
26 486 e260 659 150 240 177 697 231 42 53 36 38
27 472 e290 722 150 243 184 669 203 46 51 36 38
28 449 e325 649 150 373 234 655 138 49 41 36 37
29 385 e300 572 149 --- 273 697 107 47 34 37 38
30 346 e270 535 146 --- 301 694 109 47 34 38 41
31 342 --- 488 141 --- 423 --- 110 --- 35 39 ---
TOTAL 11756 11964 18411 6393 3626 7850 27267 12540 2393 1847 1062 1153
MEAN 379 399 594 206 130 253 909 405 79.8 59.6 34.3 38.4
MAX 2360 1160 1770 419 373 479 3240 708 150 121 39 41
MIN 30 120 311 141 91 104 254 107 42 34 31 37
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1923 - 1997, BY WATER YEAR (WY)
MEAN 140 186 194 158 168 309 638 350 178 116 96.0 91.0
MAX 461 560 607 368 550 1222 1338 769 493 658 443 591
(WY) 1976 1928 1984 1978 1981 1936 1969 1996 1984 1973 1990 1938
MIN 34.6 35.8 46.5 39.3 38.7 65.4 180 78.2 54.1 30.9 19.0 30.8
(WY) 1964 1965 1979 1981 1980 1931 1995 1957 1985 1985 1985 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1923 - 1997
ANNUAL TOTAL 145956 106262
ANNUAL MEAN 399 291 219
HIGHEST ANNUAL MEAN 359 1973
LOWEST ANNUAL MEAN 84.4 1965
HIGHEST DAILY MEAN 2530 Apr 18 3240 Apr 20 5090 Mar 19 1936
LOWEST DAILY MEAN 29 Sep 26 a 30 Oct 1 2.0 Feb 3 1929
ANNUAL SEVEN-DAY MINIMUM 30 Sep 22 30 Oct 1 16 Aug 24 1985
INSTANTANEOUS PEAK FLOW 3410 Apr 20 bc 5840 Mar 19 1936
INSTANTANEOUS PEAK STAGE 9.08 Apr 20 9.08 Apr 20 1997
10 PERCENT EXCEEDS 992 646 470
50 PERCENT EXCEEDS 267 156 124
90 PERCENT EXCEEDS 34 35 49
a Also occurred on October 2-9.
b From rating curve extended above 2,500 ft³/s on basis of computations of flow over dam at gage heights 6.85 ft and 7.50 ft.
c From gage located 900 ft downstream of present site at different datum.
e Estimated.
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