CONNECTICUT RIVER BASIN
01151500 OTTAUQUECHEE RIVER AT NORTH HARTLAND, VT
LOCATION.--Lat 43°36'09", long 72°21'17", Windsor County, Hydrologic Unit 01080106, on left bank, 100 ft upstream from
highway bridge at North Hartland, 0.3 mi downstream from North Hartland Dam, and 1.2 mi upstream from mouth.
DRAINAGE AREA.--221 mi².
PERIOD OF RECORD.--Discharge records: October 1930 to current year.
Water-quality records: Water years 1954-55.
GAGE.--Water-stage recorder. Datum of gage is 336.77 ft above sea level (levels by U. S. Army Corps of Engineers).
REMARKS.-- Records good except those for estimated daily discharges, which are fair. Flow regulated by powerplants
upstream and by North Hartland Reservoir (Reservoir in Connecticut River Basin) since March 1961; greater
regulation by powerplants at North Hartland Reservoir since July 1985. Small seasonal storage in reservoir at
Plymouth.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1760, 21.5 ft in November 1927, from floodmarks,
discharge 30,400 ft³/s, by computation of peak flow over dam.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 24,400 ft³/s, September 21, 1938, gage height, 17.68 ft, from rating
curve extended above 6,200 ft³/s on basis of computation of flow over dam at gage heights 15.58 ft, 17.68 ft, and
21.5 ft; minimum, 0.2 ft³/s, July 6, 1984 during Hydroelectric construction; minimum daily discharge, 3.8 ft³/s,
July 3, 1933. Maximum discharge since construction of North Hartland Dam in March 1961, 6,170 ft³/s,
March 17,1977, gage height, 8.67 ft.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 3,870 ft³/s, October 22, gage height, 7.25 ft; minimum daily discharge,
23 ft³/s, August 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
1 107 313 383 549 231 1270 1610 1330 389 58 36 97
2 73 269 1540 e480 232 844 989 1470 414 63 26 75
3 70 346 2470 e657 235 1300 910 1290 334 143 37 55
4 56 333 1290 657 236 948 1090 1880 300 111 27 98
5 45 298 770 647 233 713 1210 1400 278 82 45 56
6 44 251 770 651 233 663 1460 1020 254 92 31 38
7 72 273 661 558 233 624 2800 1370 220 67 42 51
8 63 358 658 392 232 582 3000 1010 201 62 28 69
9 256 423 495 321 231 470 1940 1030 198 77 23 45
10 159 1210 474 450 187 420 1450 960 179 144 25 46
11 296 1600 542 338 160 441 1180 1090 167 90 41 47
12 206 1330 509 342 160 374 996 811 183 64 48 119
13 164 906 543 397 178 320 1080 463 181 64 79 82
14 212 498 537 322 207 333 1230 365 170 52 161 25
15 53 387 536 356 160 344 1070 469 90 100 96 45
16 62 456 449 380 159 348 1060 535 110 156 64 91
17 83 374 505 276 158 348 1300 579 105 101 34 119
18 79 356 836 214 223 371 1640 600 191 89 37 111
19 66 388 989 217 257 381 2020 605 429 105 40 90
20 83 e340 743 216 688 328 2060 552 213 88 46 89
21 2250 e325 609 263 476 326 2110 554 197 53 66 89
22 3630 e295 598 277 862 327 1870 566 169 60 261 48
23 2110 e260 484 369 1290 277 1730 525 140 65 160 28
24 1120 e230 607 329 849 231 1670 488 122 63 113 28
25 693 191 812 223 568 302 1340 422 132 81 66 28
26 515 434 1820 226 499 419 1130 422 90 30 45 28
27 442 418 1320 293 795 677 1130 386 94 24 48 28
28 419 228 589 322 1750 744 1920 351 87 35 245 28
29 478 253 596 288 --- 656 2080 321 86 46 165 83
30 341 296 1140 234 --- 1060 1420 340 65 36 97 172
31 392 --- 756 250 --- 1790 --- 303 --- 36 97 ---
TOTAL 14639 13639 25031 11494 11722 18231 46495 23507 5788 2337 2329 2008
MEAN 472 455 807 371 419 588 1550 758 193 75.4 75.1 66.9
MAX 3630 1600 2470 657 1750 1790 3000 1880 429 156 261 172
MIN 44 191 383 214 158 231 910 303 65 24 23 25
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931 - 1997, BY WATER YEAR (WY)
MEAN 221 341 345 293 282 620 1368 669 283 163 120 132
MAX 1060 816 1028 900 1157 2570 2587 1676 964 1131 759 1030
(WY) 1988 1976 1984 1996 1981 1936 1969 1940 1984 1973 1976 1938
MIN 33.3 70.5 72.2 56.2 55.4 84.0 346 201 70.3 34.8 28.5 29.7
(WY) 1965 1965 1948 1948 1940 1940 1995 1941 1965 1965 1965 1967
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1931 - 1997
ANNUAL TOTAL 233660 177220
ANNUAL MEAN 638 486 403
HIGHEST ANNUAL MEAN 691 1976
LOWEST ANNUAL MEAN 173 1965
HIGHEST DAILY MEAN 3630 Oct 22 3630 Oct 22 13300 Mar 18 1936
LOWEST DAILY MEAN 33 Sep 3 23 Aug 9 3.8 Jul 3 1933
ANNUAL SEVEN-DAY MINIMUM 58 Sep 2 31 Sep 22 14 Sep 25 1967
INSTANTANEOUS PEAK FLOW 3870 Oct 22 a 24400 Sep 21 1938
INSTANTANEOUS PEAK STAGE 7.25 Oct 22 17.68 Sep 21 1938
10 PERCENT EXCEEDS 1900 1290 928
50 PERCENT EXCEEDS 383 302 205
90 PERCENT EXCEEDS 87 48 56
a From rating curve extended above 6,200 ft³/s as explained above.
e Estimated.
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