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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 04180988 St. Marys River at Rockford OH


Mercer County, Ohio
Hydrologic Unit Code 04100004
Latitude  40°41'41", Longitude  84°38'48" NAD27
Drainage area 340  square miles
Gage datum 787.39 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 2005-10-01 -> 2024-09-30)

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
1 609 244 940 575 417 314 352 60 60 115 237 481
2 565 232 1,090 495 404 279 287 59 45 96 265 574
3 549 211 1,080 459 448 277 247 51 31 76 325 656
4 505 212 1,010 519 526 274 227 44 26 61 313 581
5 439 278 903 641 529 287 188 55 26 54 248 421
6 423 515 800 671 549 284 157 63 34 76 194 352
7 424 750 713 580 536 247 137 60 40 132 157 358
8 384 765 616 539 463 204 148 46 45 176 141 325
9 323 637 616 542 394 191 198 36 92 149 135 256
10 368 462 641 534 444 213 262 42 128 103 119 214
11 467 455 660 507 518 247 285 55 146 70 101 193
12 528 544 708 535 504 264 254 59 149 48 88 234
13 696 536 757 600 446 271 236 49 120 36 87 271
14 796 470 785 570 405 293 244 41 79 30 97 308
15 862 402 839 483 442 338 277 36 51 31 116 309
16 808 327 933 441 422 504 295 35 33 35 150 280
17 638 321 884 455 420 664 259 36 29 46 190 262
18 458 415 655 428 554 654 239 44 31 55 282 243
19 374 603 527 373 605 612 245 50 26 87 373 212
20 367 596 567 407 602 544 234 41 23 159 413 187
21 366 527 634 503 554 492 198 53 26 196 353 209
22 358 505 514 491 472 487 180 75 30 231 280 313
23 334 688 421 375 359 449 229 84 40 244 249 478
24 334 686 426 271 299 431 232 91 49 209 271 578
25 392 636 489 230 315 393 198 85 52 191 307 528
26 466 564 544 363 312 337 141 69 55 175 315 453
27 438 545 502 632 368 361 108 57 59 166 313 431
28 372 641 492 747 491 443 71 42 67 185 320 498
29 318 378 526 600 546 472 56 34 66 192 350 679
30 284   609 458 489 410 63 43 57 210 389 756
31 257   636   398   60 56   226   699