MERRIMACK RIVER BASIN
01074520 EAST BRANCH PEMIGEWASSET RIVER AT LINCOLN NH
LOCATION.--Lat 44°02'51", long 71°39'37", Grafton County, Hydrologic Unit 01070001, on right bank at old crib dam,
locally known as "the old hole", 800 ft upstream of bridge, 1900 ft downstream of Pollard Brook, 1.8 mi above
mouth, east of the center of Lincoln.
DRAINAGE AREA.--115 mi².
PERIOD OF RECORD.--Discharge records: March 1993 to current year. Records for November 1928 to March 1953 at site
2.7 mi upstream published as "near Lincoln" (station 0104500) are not equivalent because of difference in drainage
areas.
GAGE.--Water-stage recorder and crest stage gage. Elevation of gage is 830 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of March 19, 1936, reached a stage of 9.80 ft, former site and datum,
discharge, 17,000 ft³/s. Flood in October 1959 reached a discharge of 24,200 ft³/s, by computation of peak flow
over dam.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,900 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 1645 * 9,650 * 8.26 Dec. 2 1015 6,420 6.70
Nov. 9 1415 5,790 6.36
Minimum discharge, 59 ft³/s, October 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 80 321 419 e250 e115 218 213 1400 994 127 91 122
2 70 274 3320 e310 e115 281 185 2020 856 116 85 108
3 70 246 1120 e350 e110 476 177 1170 766 369 93 115
4 69 223 680 304 e110 268 188 1080 688 625 85 106
5 64 210 509 277 e110 224 210 869 622 293 83 95
6 62 200 421 374 e115 217 400 977 565 213 85 86
7 61 203 364 e260 e110 194 815 1270 526 181 79 84
8 60 636 338 e220 e105 184 838 843 490 164 74 98
9 153 3120 297 e210 e98 e180 533 738 477 167 73 86
10 185 1450 262 e260 e105 e170 416 658 535 474 75 80
11 248 852 240 e240 e98 158 360 612 555 261 72 80
12 140 634 221 e220 e96 e140 323 615 466 192 81 166
13 112 499 209 e190 e90 e140 316 796 501 166 168 137
14 102 407 199 e180 e92 e145 302 909 629 160 207 103
15 93 350 190 e170 e94 e160 285 932 375 969 105 90
16 88 325 179 e170 e88 e150 305 1070 299 578 102 84
17 85 283 274 e180 e86 e140 376 895 261 371 89 79
18 81 263 614 e170 e88 e130 958 824 280 320 80 81
19 78 247 437 e160 e100 e125 2710 839 877 505 71 77
20 85 227 347 e150 159 e120 1360 1070 469 345 65 82
21 4540 210 e250 e145 108 111 1040 1010 416 271 80 101
22 2820 193 e240 e145 249 107 896 935 428 233 305 85
23 1160 180 253 e150 580 e98 869 894 383 204 233 81
24 819 167 430 e140 225 e96 880 793 297 186 147 110
25 608 161 1250 e125 145 e95 751 855 259 167 112 89
26 467 199 570 e140 165 162 756 883 233 149 100 82
27 388 194 471 129 174 164 819 736 200 135 100 78
28 369 e130 400 e125 364 132 959 743 176 127 284 75
29 356 e150 403 124 --- 157 805 854 156 122 205 101
30 326 153 543 114 --- 304 801 887 140 107 231 194
31 430 --- 327 117 --- 284 --- 933 --- 98 149 ---
TOTAL 14269 12707 15777 6099 4094 5530 19846 29110 13919 8395 3809 2955
MEAN 460 424 509 197 146 178 662 939 464 271 123 98.5
MAX 4540 3120 3320 374 580 476 2710 2020 994 969 305 194
MIN 60 130 179 114 86 95 177 612 140 98 65 75
CFSM 4.00 3.68 4.43 1.71 1.27 1.55 5.75 8.17 4.03 2.35 1.07 .86
IN. 4.62 4.11 5.10 1.97 1.32 1.79 6.42 9.42 4.50 2.72 1.23 .96
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1993 - 1997, BY WATER YEAR (WY)
MEAN 393 427 287 313 184 187 787 798 303 235 141 118
MAX 740 760 509 564 389 254 1093 1323 464 525 167 193
(WY) 1996 1996 1997 1996 1996 1995 1993 1996 1997 1996 1994 1994
MIN 147 139 121 116 90.5 95.2 264 412 180 105 123 67.7
(WY) 1995 1995 1996 1994 1994 1994 1995 1993 1995 1993 1997 1996
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1993 - 1997
ANNUAL TOTAL 178796 136510
ANNUAL MEAN 489 374 353
HIGHEST ANNUAL MEAN 507 1996
LOWEST ANNUAL MEAN 202 1995
HIGHEST DAILY MEAN 4540 Oct 21 4540 Oct 21 6280 Apr 17 1993
LOWEST DAILY MEAN 46 Sep 24 60 Oct 8 46 Sep 24 1996
ANNUAL SEVEN-DAY MINIMUM 53 Sep 19 65 Oct 2 53 Sep 1 1995
INSTANTANEOUS PEAK FLOW a 9650 Oct 21 a 16500 Oct 22 1995
INSTANTANEOUS PEAK STAGE 8.26 Oct 21 11.07 Oct 22 1995
INSTANTANEOUS LOW FLOW 59 Oct 8 45 Sep 24 1996
ANNUAL RUNOFF (CFSM) 4.25 3.25 3.07
ANNUAL RUNOFF (INCHES) 57.84 44.16 41.69
10 PERCENT EXCEEDS 1170 869 815
50 PERCENT EXCEEDS 253 210 190
90 PERCENT EXCEEDS 70 85 78
a From rating curve extended above 4,500 ft³/s.
e Estimated.
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