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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.


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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 06101500 Marias River near Chester MT


Liberty County, Montana
Hydrologic Unit Code 10030203
Latitude  48°18'21.46", Longitude 111°04'49.90" NAD83
Drainage area 4,944  square miles
Contributing drainage area 4,397  square miles
Gage datum 2,814.03 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 1920-10-01 -> 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
1 454 442 522 673 875 1,340 1,360 960 794 774 612 507
2 454 444 525 682 879 1,360 1,320 960 799 764 608 500
3 453 446 527 686 895 1,400 1,290 957 811 757 603 492
4 449 445 529 714 934 1,420 1,280 926 815 763 601 482
5 446 447 529 714 950 1,410 1,260 901 806 756 598 476
6 445 445 527 709 961 1,420 1,240 903 797 746 600 474
7 445 447 528 703 974 1,460 1,220 929 793 741 598 472
8 443 449 532 700 988 1,480 1,210 932 796 737 598 471
9 441 456 530 699 1,000 1,490 1,200 909 802 735 594 468
10 440 459 529 701 1,020 1,560 1,190 916 802 740 592 466
11 439 460 533 702 1,050 1,610 1,190 938 802 746 593 466
12 438 462 533 707 1,080 1,630 1,190 938 804 742 593 467
13 438 466 528 705 1,100 1,660 1,170 929 802 735 594 467
14 438 469 531 711 1,100 1,690 1,150 900 796 730 593 467
15 439 472 541 719 1,100 1,670 1,140 860 790 723 589 466
16 438 476 558 736 1,110 1,620 1,130 857 779 712 585 464
17 439 479 572 741 1,120 1,580 1,100 856 782 697 581 461
18 440 480 581 746 1,130 1,540 1,060 859 789 685 577 459
19 439 483 591 752 1,150 1,520 1,050 865 796 677 574 458
20 439 487 593 766 1,180 1,490 1,060 860 794 662 572 458
21 439 490 605 784 1,200 1,480 1,060 848 790 649 569 458
22 439 495 621 789 1,210 1,470 1,040 833 790 645 566 458
23 438 495 632 795 1,210 1,460 1,030 828 794 645 564 458
24 439 493 645 794 1,220 1,450 1,030 821 796 639 563 458
25 439 492 655 797 1,230 1,470 1,000 823 790 628 561 458
26 440 491 661 812 1,260 1,440 998 823 790 623 555 458
27 440 487 671 826 1,290 1,410 989 814 790 624 552 457
28 439 489 679 830 1,310 1,390 971 806 790 617 543 456
29 439 439 680 839 1,330 1,380 965 801 791 611 525 456
30 439   679 873 1,330 1,370 966 802 800 609 513 456
31 437   682   1,340   966 797   612   455