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USGS 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 01402000 Millstone River at Blackwells Mills NJ


Somerset County, New Jersey
Hydrologic Unit Code 02030105
Latitude  40°28'30", Longitude  74°34'33" NAD83
Drainage area 258  square miles
Gage datum 26.97 feet above NGVD29
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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 1921-10-01 -> 2021-09-30)

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
1 521 381 607 716 448 341 185 282 150 229 266 466
2 562 423 617 735 397 364 167 240 173 194 246 470
3 575 542 624 705 365 359 170 249 178 171 242 446
4 574 557 675 606 371 311 198 215 197 147 240 431
5 507 508 692 641 366 317 178 193 162 138 234 452
6 492 455 696 630 379 315 221 173 166 151 232 494
7 519 521 804 657 389 315 231 167 274 146 259 478
8 504 594 779 604 383 325 217 176 231 138 325 486
9 497 491 710 598 377 260 230 230 206 197 401 490
10 504 452 626 589 390 256 198 273 160 176 385 505
11 444 480 666 525 401 250 200 223 163 168 310 503
12 448 519 711 489 416 222 184 225 208 222 306 611
13 422 511 784 539 414 284 247 304 244 228 369 543
14 410 585 870 532 402 314 328 300 220 191 352 568
15 458 607 829 513 360 275 398 261 237 206 331 531
16 452 572 711 683 353 219 247 194 251 216 316 470
17 406 550 649 787 405 225 191 171 339 190 333 506
18 412 550 610 578 387 230 209 165 233 201 332 488
19 521 581 634 465 366 234 185 179 215 298 302 439
20 597 617 704 433 353 271 188 183 219 395 351 388
21 546 601 691 405 330 250 280 158 321 306 385 525
22 549 609 804 409 288 256 300 240 349 231 389 554
23 457 654 807 402 282 264 352 343 217 191 361 461
24 514 684 747 403 327 259 416 282 187 182 319 436
25 707 735 662 450 392 226 304 197 227 224 365 486
26 686 769 567 429 377 185 233 161 246 239 428 518
27 604 686 565 458 347 166 219 189 259 225 428 542
28 586 640 590 513 331 204 268 508 255 289 431 481
29 551 537 615 488 320 216 268 424 244 318 522 517
30 440   663 386 399 210 273 229 246 321 485 536
31 407   719   384   283 159   284   577