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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 -> 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
1 609 244 895 560 428 305 338 57 57 111 226 481
2 565 232 1,030 536 412 271 275 57 43 92 252 574
3 549 211 1,020 616 441 276 237 50 30 73 309 656
4 505 212 957 724 508 274 217 42 25 59 298 581
5 439 278 858 805 508 282 182 53 25 53 236 421
6 423 515 761 758 526 277 152 61 33 73 194 352
7 424 750 679 619 513 249 133 58 38 126 157 358
8 384 765 589 555 446 205 142 45 43 167 141 325
9 323 637 605 541 393 188 190 35 88 142 135 256
10 368 462 641 521 449 207 253 41 122 98 119 214
11 467 455 671 524 526 238 288 53 139 67 101 193
12 528 544 723 618 518 253 266 57 141 46 88 234
13 696 536 760 762 458 260 254 47 114 35 87 271
14 796 470 772 720 403 280 261 39 76 29 97 308
15 862 402 834 570 429 323 278 34 49 30 116 309
16 808 327 936 481 408 479 286 33 32 33 150 280
17 638 321 907 470 405 631 250 35 28 44 190 262
18 458 415 679 433 533 621 229 42 30 52 282 243
19 374 603 539 381 582 582 234 48 25 83 373 212
20 367 596 558 416 578 518 223 40 23 151 413 187
21 366 502 611 500 530 468 190 52 25 187 353 209
22 358 481 493 479 452 463 172 72 29 220 280 313
23 334 657 404 365 344 427 218 80 38 232 249 478
24 334 659 408 266 287 410 220 87 47 199 271 578
25 392 610 468 225 301 375 189 81 51 182 307 528
26 466 541 519 350 299 323 134 66 55 167 315 453
27 438 521 479 604 355 346 103 54 59 158 313 431
28 372 613 470 713 478 423 68 40 65 176 320 498
29 318 321 502 573 528 451 54 33 64 183 350 679
30 284   581 457 474 393 60 41 56 199 389 756
31 257   606   389   57 54   215   699