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USGS Surface-Water Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 01094000 SOUHEGAN RIVER AT MERRIMACK, NH


Hillsborough County, New Hampshire
Hydrologic Unit Code 01070002
Latitude  42°51'27", Longitude  71°30'24" NAD27
Drainage area 171  square miles
Gage datum 159.88 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1908-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 290 265 393 927 553 257 168 107 92 128 208 308
2 292 250 397 1,030 520 265 164 104 88 103 193 299
3 287 253 390 1,040 490 251 172 95 85 96 201 290
4 291 278 382 1,010 482 255 156 89 82 86 270 285
5 273 291 377 964 471 236 143 126 70 94 255 303
6 265 276 399 959 459 229 136 109 64 87 214 334
7 282 266 448 968 403 233 126 97 82 99 200 365
8 281 280 483 937 383 233 112 94 90 100 220 351
9 279 271 529 822 381 227 134 100 88 98 226 341
10 329 237 540 769 381 260 135 99 87 92 238 350
11 319 246 466 752 364 259 120 95 81 86 258 370
12 304 261 478 760 372 231 110 96 116 93 221 379
13 318 254 556 834 384 228 112 94 117 93 237 363
14 314 267 579 774 404 223 103 95 95 89 291 333
15 299 281 643 732 421 227 98 88 103 115 268 394
16 290 286 655 753 424 223 91 79 86 184 233 329
17 278 281 638 812 419 206 98 75 90 150 234 291
18 252 281 676 747 407 227 93 75 105 148 237 300
19 268 292 791 705 378 202 102 74 119 144 230 346
20 263 267 691 647 363 202 103 78 111 152 245 303
21 246 267 691 618 347 187 95 70 154 146 249 301
22 262 294 709 591 355 202 99 65 169 129 231 317
23 291 321 681 609 351 189 104 73 105 123 243 302
24 304 315 687 623 334 186 112 80 89 138 238 334
25 323 351 712 586 317 235 114 76 86 178 258 329
26 365 409 763 551 318 219 95 72 90 188 286 330
27 359 401 807 571 321 184 87 78 111 172 299 333
28 356 388 885 550 302 171 105 70 102 168 276 329
29 315 347 852 581 293 180 112 88 92 179 309 310
30 279   879 562 267 180 132 84 103 197 305 297
31 267   902   237   120 81   225   295