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USGS Daily Statistics for Montana

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Questions or concerns about USGS data and data products in Montana and Wyoming can be directed to the Wyoming-Montana Water Science Center Data Management Section.


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 12340000 Blackfoot River near Bonner MT


Missoula County, Montana
Hydrologic Unit Code 17010203
Latitude  46°53'57.88", Longitude 113°45'22.75" NAD83
Drainage area 2,287  square miles
Gage datum 3,344.76 feet above NGVD29
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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 1897-10-01 -> 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
1 541 567 643 1,200 3,310 5,930 2,990 1,000 687 626 656 647
2 532 575 653 1,250 3,400 5,900 2,880 985 685 637 658 657
3 527 577 643 1,270 3,510 5,960 2,770 963 680 631 656 660
4 527 568 636 1,310 3,640 6,030 2,680 942 671 630 661 665
5 531 573 635 1,350 3,810 6,020 2,590 924 664 623 665 658
6 542 579 642 1,430 3,950 5,950 2,480 909 662 623 668 638
7 563 574 643 1,520 4,140 5,830 2,370 894 658 624 669 617
8 568 585 656 1,580 4,280 5,670 2,260 878 658 624 686 613
9 567 612 665 1,640 4,360 5,560 2,170 860 657 629 682 607
10 561 601 675 1,710 4,460 5,440 2,090 847 658 626 674 607
11 550 603 699 1,810 4,560 5,260 2,000 833 655 626 666 611
12 542 602 722 1,880 4,650 5,110 1,920 822 652 632 657 611
13 546 593 736 1,960 4,790 5,020 1,850 810 651 633 656 612
14 552 590 740 2,010 4,870 4,980 1,790 801 651 636 661 615
15 557 587 748 2,060 4,970 4,840 1,720 786 651 635 661 607
16 577 595 784 2,100 5,130 4,760 1,650 778 649 639 655 596
17 580 601 826 2,140 5,330 4,730 1,580 771 648 642 654 585
18 579 600 842 2,180 5,500 4,640 1,520 762 648 640 649 578
19 570 601 862 2,250 5,610 4,530 1,460 751 648 638 647 570
20 563 616 871 2,380 5,680 4,410 1,420 744 647 639 642 571
21 563 627 882 2,520 5,780 4,300 1,370 740 647 638 639 567
22 563 621 915 2,630 5,820 4,140 1,320 736 644 640 640 567
23 559 614 949 2,760 5,850 3,980 1,270 736 642 640 634 571
24 554 614 973 2,860 5,920 3,840 1,220 732 640 646 647 577
25 557 612 980 2,950 5,980 3,690 1,190 725 635 645 662 573
26 548 606 990 3,030 6,050 3,550 1,150 719 634 653 664 574
27 549 613 1,010 3,090 6,090 3,410 1,120 712 633 654 654 575
28 542 625 1,050 3,130 6,080 3,250 1,090 707 635 656 644 565
29 535 625 1,080 3,160 6,030 3,140 1,070 697 632 653 636 551
30 537   1,110 3,240 6,030 3,070 1,040 691 629 652 641 551
31 559   1,150   5,980   1,020 688   655   553