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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
1 455 442 523 676 882 1,350 1,380 969 794 774 612 508
2 455 445 527 685 885 1,370 1,330 969 799 764 608 501
3 454 446 529 689 901 1,410 1,300 965 811 757 603 493
4 450 446 530 719 941 1,430 1,290 934 815 763 603 483
5 447 448 531 718 958 1,430 1,280 908 806 756 601 477
6 445 446 528 713 968 1,440 1,250 911 797 746 602 475
7 445 448 529 707 982 1,480 1,230 937 793 741 601 473
8 443 450 533 704 996 1,490 1,220 940 796 737 600 472
9 441 457 531 703 1,010 1,510 1,210 917 802 735 597 469
10 440 459 531 705 1,030 1,570 1,200 924 802 740 595 466
11 440 461 535 706 1,060 1,630 1,200 946 802 746 596 467
12 439 462 534 711 1,090 1,640 1,200 946 804 742 596 468
13 439 467 530 709 1,110 1,680 1,180 937 802 735 597 468
14 439 470 533 715 1,110 1,700 1,160 908 796 730 596 468
15 439 473 543 723 1,110 1,680 1,150 867 790 723 592 467
16 439 477 560 741 1,120 1,640 1,140 864 779 712 588 465
17 440 480 574 745 1,130 1,590 1,110 863 782 697 584 462
18 440 481 583 751 1,140 1,560 1,070 866 789 685 579 460
19 440 485 593 757 1,160 1,540 1,060 865 796 677 577 459
20 440 488 595 771 1,190 1,510 1,070 860 794 662 574 459
21 439 492 608 789 1,210 1,500 1,070 848 790 649 572 459
22 439 497 624 795 1,220 1,490 1,050 833 790 645 568 458
23 439 497 635 800 1,230 1,470 1,040 828 794 645 567 458
24 439 495 649 800 1,230 1,460 1,040 821 796 639 565 459
25 440 493 659 802 1,240 1,480 1,010 823 790 628 563 458
26 440 492 664 817 1,270 1,450 1,010 823 790 623 557 459
27 440 488 675 831 1,300 1,430 998 814 790 624 554 458
28 440 490 682 836 1,320 1,410 979 806 790 617 545 457
29 440 439 684 845 1,340 1,390 974 801 791 611 527 457
30 440   682 879 1,350 1,380 975 802 800 609 515 456
31 438   686   1,350   975 797   612   456