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USGS Surface-Water Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).


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 -> 2019-09-30)

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
1 447 434 522 686 887 1,400 1,410 967 813 795 621 507
2 447 437 526 696 888 1,420 1,350 967 819 785 616 498
3 446 439 528 699 905 1,450 1,320 963 832 777 611 489
4 442 438 530 731 949 1,470 1,310 930 836 784 608 479
5 438 440 530 730 967 1,460 1,290 902 826 777 605 472
6 437 438 528 725 978 1,480 1,260 906 816 766 608 469
7 437 440 529 718 993 1,520 1,240 940 812 760 605 468
8 435 443 533 715 1,010 1,540 1,230 950 816 756 606 466
9 433 451 531 714 1,020 1,550 1,220 933 823 754 602 462
10 432 453 531 716 1,040 1,620 1,210 941 823 759 600 459
11 431 455 535 717 1,080 1,680 1,210 966 824 765 600 460
12 430 456 534 723 1,110 1,690 1,210 966 826 761 601 462
13 430 461 529 721 1,130 1,720 1,190 956 824 754 602 461
14 430 464 533 727 1,130 1,740 1,170 926 818 748 601 461
15 430 468 544 736 1,130 1,720 1,170 885 810 741 597 460
16 430 472 562 755 1,150 1,680 1,160 883 799 729 592 458
17 431 475 577 760 1,160 1,630 1,130 882 803 712 588 454
18 431 477 587 765 1,170 1,600 1,090 885 811 700 583 452
19 431 480 598 772 1,190 1,580 1,080 884 819 691 580 452
20 431 484 600 787 1,220 1,550 1,090 882 817 675 578 451
21 430 488 613 807 1,250 1,540 1,090 870 813 661 575 451
22 430 493 630 813 1,260 1,530 1,070 855 813 656 571 451
23 430 493 643 819 1,260 1,520 1,030 850 817 656 569 451
24 430 491 657 818 1,270 1,510 1,030 843 819 650 568 451
25 431 490 668 820 1,280 1,530 1,010 845 813 638 566 451
26 431 488 674 837 1,310 1,500 1,000 845 813 632 559 451
27 431 484 685 850 1,340 1,470 994 835 812 633 556 450
28 431 487 693 851 1,370 1,450 974 826 813 626 546 449
29 431 425 694 857 1,390 1,430 971 821 814 620 526 449
30 431   693 891 1,390 1,420 974 822 824 617 513 449
31 429   696   1,400   974 817   620   448