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USGS Surface-Water 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 05471500 South Skunk River near Oskaloosa, IA


Mahaska County, Iowa
Hydrologic Unit Code 07080105
Latitude  41°21'20.53", Longitude  92°39'26.48" NAD83
Drainage area 1,635  square miles
Gage datum 685.08 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 1945-10-01 -> 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
1 566 474 1,160 1,820 1,840 2,200 2,250 844 694 622 675 571
2 553 543 1,150 1,810 1,850 2,130 2,140 773 750 659 748 566
3 524 593 1,250 1,780 1,830 1,990 2,080 748 727 660 679 541
4 493 636 1,320 1,740 1,720 1,860 1,970 728 690 619 676 533
5 498 639 1,330 1,670 1,710 1,890 1,980 706 658 610 647 541
6 504 594 1,310 1,580 1,680 1,900 1,950 771 641 609 588 544
7 496 586 1,290 1,510 1,730 1,920 1,900 685 633 555 581 529
8 513 585 1,410 1,440 1,810 1,980 1,790 633 643 550 588 509
9 535 591 1,500 1,380 1,860 2,100 1,650 665 629 644 578 490
10 512 583 1,570 1,440 1,960 2,180 1,590 746 674 639 576 487
11 473 609 1,590 1,470 1,980 2,170 1,470 800 602 674 557 486
12 468 571 1,640 1,470 1,860 2,200 1,520 828 530 737 587 491
13 511 549 1,830 1,520 1,910 2,350 1,520 871 607 768 588 492
14 504 582 1,950 1,520 1,960 2,520 1,490 961 565 794 572 539
15 475 597 1,960 1,510 1,920 2,870 1,470 933 529 799 552 559
16 485 635 1,950 1,560 1,870 3,030 1,410 862 488 748 559 581
17 515 696 1,950 1,580 1,950 2,870 1,350 833 483 716 574 593
18 517 843 1,920 1,680 1,870 2,750 1,360 794 500 690 586 590
19 512 1,100 2,030 1,760 1,810 2,700 1,370 775 535 639 573 584
20 549 1,250 2,130 1,780 1,840 2,750 1,380 755 572 626 593 557
21 591 1,280 2,120 1,750 1,870 2,770 1,370 757 684 598 589 510
22 623 1,290 2,080 1,660 1,870 2,630 1,310 752 698 609 567 484
23 616 1,350 1,920 1,640 1,900 2,610 1,150 751 660 701 559 479
24 581 1,320 1,700 1,650 1,940 2,570 1,070 752 637 727 546 483
25 565 1,280 1,650 1,730 2,060 2,460 1,030 683 646 718 533 510
26 547 1,200 1,630 1,710 2,220 2,360 1,010 662 682 664 535 532
27 530 1,130 1,600 1,800 2,330 2,340 1,020 784 695 610 553 545
28 493 1,130 1,600 1,810 2,380 2,370 972 812 646 571 581 609
29 469 1,180 1,600 1,830 2,420 2,250 974 715 634 552 596 640
30 456   1,640 1,840 2,370 2,190 941 724 628 596 592 649
31 456   1,750   2,260   919 715   614   600