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USGS Daily Statistics for Iowa

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Boating safety tips are available from the U.S. Coast Guard.

NOTE: Station Numbers for Iowa precipitation gages have changed (see list).


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 05451500 Iowa River at Marshalltown, IA


Marshall County, Iowa
Hydrologic Unit Code 07080208
Latitude  42°03'57", Longitude  92°54'27" NAD27
Drainage area 1,532  square miles
Gage datum 852.94 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 1902-10-01 -> 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
1 447 351 985 2,030 1,420 2,010 1,930 777 581 676 613 462
2 424 380 1,010 1,890 1,470 2,100 1,780 766 539 670 608 459
3 400 376 1,060 1,820 1,510 2,070 1,660 707 528 686 580 451
4 375 366 1,200 1,780 1,530 2,170 1,580 649 509 696 573 439
5 386 381 1,310 1,740 1,550 2,120 1,450 624 479 667 569 435
6 443 395 1,300 1,700 1,560 1,910 1,370 596 482 691 558 446
7 408 415 1,330 1,630 1,570 1,830 1,300 581 464 638 560 430
8 379 401 1,290 1,520 1,580 1,810 1,280 573 523 631 548 419
9 353 408 1,270 1,510 1,600 1,980 1,450 578 538 648 555 400
10 338 434 1,290 1,480 1,580 1,990 1,520 597 519 651 549 397
11 317 454 1,380 1,460 1,490 1,870 1,380 605 493 677 550 391
12 310 423 1,510 1,480 1,470 1,860 1,330 617 495 705 562 383
13 302 453 1,670 1,540 1,530 2,130 1,230 558 495 670 549 411
14 290 481 1,820 1,520 1,550 2,120 1,190 532 522 644 528 475
15 280 502 1,870 1,540 1,470 2,070 1,140 548 513 631 524 518
16 287 609 1,860 1,570 1,440 2,080 1,030 621 532 606 518 480
17 297 627 1,870 1,600 1,410 2,090 996 648 553 573 518 444
18 313 711 1,770 1,640 1,420 2,040 1,050 562 510 557 513 419
19 316 832 1,950 1,600 1,530 2,060 1,020 525 552 549 514 399
20 324 995 2,030 1,510 1,660 2,030 1,030 589 644 540 524 384
21 340 1,020 1,940 1,490 1,650 2,000 981 629 696 534 519 379
22 352 963 1,780 1,440 1,670 2,160 912 627 629 567 513 372
23 349 980 1,720 1,450 1,750 2,240 870 621 629 609 507 367
24 332 1,030 1,710 1,440 1,710 2,180 862 599 633 602 495 375
25 317 970 1,770 1,440 1,740 2,070 855 575 646 572 477 381
26 315 941 1,760 1,550 1,810 1,940 861 645 707 545 467 392
27 317 954 1,850 1,600 2,000 1,860 870 665 708 524 473 402
28 321 1,060 1,810 1,510 2,000 1,870 891 639 704 509 478 461
29 301 1,040 1,800 1,420 1,970 1,850 850 639 676 506 475 455
30 309   1,790 1,410 2,100 1,900 817 678 697 536 465 438
31 340   1,990   2,070   799 628   585   462