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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 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 -> 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
1 565 475 1,150 1,820 1,840 2,220 2,250 891 690 616 672 570
2 553 543 1,140 1,810 1,860 2,140 2,160 800 745 653 742 564
3 526 593 1,240 1,780 1,840 2,000 2,130 766 722 653 681 539
4 496 634 1,300 1,740 1,750 1,870 1,990 739 684 613 685 530
5 501 638 1,330 1,670 1,730 1,900 1,990 715 653 605 654 537
6 509 593 1,310 1,580 1,700 1,920 1,960 776 637 603 593 540
7 502 585 1,290 1,510 1,750 1,930 1,900 690 628 549 584 526
8 519 583 1,420 1,440 1,850 1,980 1,800 637 638 544 590 507
9 540 589 1,500 1,380 1,900 2,100 1,670 667 624 638 580 487
10 516 580 1,570 1,440 2,000 2,170 1,610 746 668 633 577 484
11 477 606 1,590 1,470 2,020 2,160 1,480 798 597 667 558 483
12 471 568 1,650 1,470 1,890 2,200 1,530 825 526 729 587 487
13 513 546 1,830 1,520 1,930 2,340 1,530 868 602 760 588 488
14 507 578 1,940 1,520 1,970 2,510 1,490 957 560 786 573 535
15 477 593 1,950 1,510 1,920 2,850 1,470 930 525 790 553 555
16 487 631 1,940 1,560 1,880 3,010 1,410 860 484 740 560 576
17 516 691 1,940 1,580 1,950 2,850 1,360 830 479 708 575 589
18 519 837 1,910 1,680 1,860 2,730 1,360 791 496 683 586 586
19 513 1,090 2,010 1,760 1,810 2,690 1,370 771 531 632 573 581
20 549 1,240 2,120 1,780 1,890 2,750 1,380 751 567 620 594 554
21 590 1,270 2,110 1,750 1,930 2,770 1,370 752 679 592 590 507
22 622 1,280 2,070 1,660 1,960 2,630 1,300 747 692 603 570 482
23 615 1,340 1,910 1,630 2,010 2,600 1,150 747 654 693 561 477
24 581 1,300 1,690 1,640 2,090 2,560 1,070 746 631 719 547 482
25 565 1,270 1,640 1,720 2,210 2,450 1,030 678 640 711 534 507
26 547 1,190 1,630 1,700 2,330 2,350 1,010 657 676 657 535 529
27 530 1,120 1,590 1,790 2,410 2,330 1,020 778 688 604 553 542
28 494 1,120 1,590 1,800 2,440 2,370 970 805 640 565 581 606
29 470 1,180 1,590 1,830 2,460 2,260 977 709 627 546 595 637
30 457   1,630 1,840 2,400 2,190 954 720 622 590 590 647
31 457   1,730   2,280   977 713   614   598