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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 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
1 454 442 523 676 882 1,350 1,380 969 794 774 612 507
2 454 444 527 685 885 1,370 1,330 969 799 764 608 500
3 453 446 529 689 901 1,410 1,300 965 811 757 603 492
4 449 445 530 719 941 1,430 1,290 934 815 763 601 482
5 446 447 531 718 958 1,430 1,280 908 806 756 598 476
6 445 445 528 713 968 1,440 1,250 911 797 746 600 474
7 445 447 529 707 982 1,480 1,230 937 793 741 598 472
8 443 449 533 704 996 1,490 1,220 940 796 737 598 471
9 441 456 531 703 1,010 1,510 1,210 917 802 735 594 468
10 440 459 531 705 1,030 1,570 1,200 924 802 740 592 466
11 439 460 535 706 1,060 1,630 1,200 946 802 746 593 466
12 438 462 534 711 1,090 1,640 1,200 946 804 742 593 467
13 438 466 530 709 1,110 1,680 1,180 937 802 735 594 467
14 438 469 533 715 1,110 1,700 1,160 908 796 730 593 467
15 439 472 543 723 1,110 1,680 1,150 867 790 723 589 466
16 438 476 560 741 1,120 1,640 1,140 864 779 712 585 464
17 439 479 574 745 1,130 1,590 1,110 863 782 697 581 461
18 440 480 583 751 1,140 1,560 1,070 866 789 685 577 459
19 439 483 593 757 1,160 1,540 1,060 865 796 677 574 458
20 439 487 595 771 1,190 1,510 1,070 860 794 662 572 458
21 439 490 608 789 1,210 1,500 1,070 848 790 649 569 458
22 439 495 624 795 1,220 1,490 1,050 833 790 645 566 458
23 438 495 635 800 1,230 1,470 1,040 828 794 645 564 458
24 439 493 649 800 1,230 1,460 1,040 821 796 639 563 458
25 439 492 659 802 1,240 1,480 1,010 823 790 628 561 458
26 440 492 664 817 1,270 1,450 1,010 823 790 623 555 458
27 440 488 675 831 1,300 1,430 998 814 790 624 552 457
28 439 490 682 836 1,320 1,410 979 806 790 617 543 456
29 439 439 684 845 1,340 1,390 974 801 791 611 525 456
30 439   682 879 1,350 1,380 975 802 800 609 513 456
31 437   686   1,350   975 797   612   455