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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 -> 2020-09-30)

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 1,410 991 812 793 621 507
2 447 437 526 696 888 1,420 1,350 992 817 784 616 498
3 446 439 528 699 905 1,450 1,320 988 830 776 611 489
4 442 438 530 731 949 1,470 1,310 955 834 783 608 479
5 438 440 530 730 967 1,460 1,290 927 824 776 605 472
6 437 438 528 725 978 1,480 1,260 931 815 765 608 469
7 437 440 529 718 993 1,520 1,240 959 811 759 605 468
8 435 443 533 715 1,010 1,540 1,230 964 814 755 606 466
9 433 451 531 714 1,020 1,550 1,220 942 821 753 602 462
10 432 453 531 716 1,040 1,620 1,210 949 821 758 600 459
11 431 455 535 717 1,080 1,680 1,210 973 822 764 600 460
12 430 456 534 723 1,110 1,690 1,210 973 824 761 601 462
13 430 461 529 721 1,130 1,720 1,190 963 822 753 602 461
14 430 464 533 727 1,130 1,740 1,170 932 816 747 601 461
15 430 468 544 736 1,130 1,720 1,170 889 809 740 597 460
16 430 472 562 755 1,150 1,680 1,160 885 798 729 592 458
17 431 475 577 760 1,160 1,630 1,130 884 802 712 588 454
18 431 477 587 765 1,170 1,600 1,090 887 809 700 583 452
19 431 480 598 772 1,190 1,580 1,080 886 817 691 580 452
20 431 484 600 787 1,220 1,550 1,090 880 816 675 578 451
21 430 488 613 807 1,250 1,540 1,090 867 811 661 575 451
22 430 493 630 813 1,260 1,530 1,070 852 811 656 571 451
23 430 493 643 819 1,260 1,520 1,060 848 815 656 569 451
24 430 491 657 818 1,270 1,510 1,060 840 818 650 568 451
25 431 490 668 820 1,280 1,530 1,030 843 811 638 566 451
26 431 488 674 837 1,310 1,500 1,030 843 811 632 559 451
27 431 484 685 850 1,340 1,470 1,020 833 811 633 556 450
28 431 487 693 851 1,370 1,450 998 824 811 626 546 449
29 431 425 694 857 1,390 1,430 996 819 813 620 526 449
30 431   693 891 1,390 1,420 998 820 822 617 513 449
31 429   696   1,400   998 815   620   448