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USGS 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).

Updated June 11, 2020 - USGS water-resources monitoring activities will be restored at the following sites:
  • 12323600 Silver Bow Creek at Opportunity, Montana (POR: 31 years)
  • 12323750 Silver Bow Creek at Warm Springs, Montana (POR: 35 years)

Updated May 12, 2020 - USGS water-resources monitoring activities were suspended effective June 1, 2020 at the following site:
  • 06088500 Muddy Creek near Vaughn, Montana (POR: 82 years)
USGS monitoring activities at this site was funded by our partner and USGS Cooperative Matching Funds (06088500). Lack of partner funding for this site resulted in suspension of all USGS monitoring activities. Efforts are ongoing to secure funding for future monitoring. Historical data will continue to be available from USGS.

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
1 451 438 522 686 887 1,400 1,410 991 812 793 622 509
2 451 441 526 696 888 1,420 1,350 992 817 784 618 501
3 449 442 528 699 905 1,450 1,320 988 830 776 612 493
4 446 442 530 731 949 1,470 1,310 955 834 783 609 482
5 442 444 530 730 967 1,460 1,290 927 824 776 607 475
6 441 442 528 725 978 1,480 1,260 931 815 765 609 473
7 441 444 529 718 993 1,520 1,240 959 811 759 607 471
8 439 447 533 715 1,010 1,540 1,230 964 814 755 607 469
9 437 454 531 714 1,020 1,550 1,220 942 821 753 604 466
10 436 457 531 716 1,040 1,620 1,210 949 821 758 602 463
11 435 458 535 717 1,080 1,680 1,210 973 822 764 602 464
12 434 460 534 723 1,110 1,690 1,210 973 824 761 603 465
13 434 465 529 721 1,130 1,720 1,190 963 822 753 604 464
14 434 468 533 727 1,130 1,740 1,170 932 816 747 603 465
15 434 471 544 736 1,130 1,720 1,170 889 809 740 598 463
16 434 475 562 755 1,150 1,680 1,160 885 798 729 594 461
17 435 478 577 760 1,160 1,630 1,130 884 802 713 590 458
18 435 480 587 765 1,170 1,600 1,090 887 809 700 585 456
19 435 483 598 772 1,190 1,580 1,080 886 817 691 582 455
20 435 487 600 787 1,220 1,550 1,090 880 816 676 579 455
21 434 491 613 807 1,250 1,540 1,090 867 811 662 577 455
22 434 496 630 813 1,260 1,530 1,070 852 811 657 573 454
23 434 496 643 819 1,260 1,520 1,060 848 815 657 571 455
24 434 494 657 818 1,270 1,510 1,060 840 818 651 570 455
25 435 493 668 820 1,280 1,530 1,030 843 811 639 568 455
26 435 488 674 837 1,310 1,500 1,030 843 811 633 561 455
27 435 484 685 850 1,340 1,470 1,020 833 811 634 558 454
28 435 487 693 851 1,370 1,450 998 824 811 627 548 453
29 435 425 694 857 1,390 1,430 996 819 813 621 529 453
30 435   693 891 1,390 1,420 998 820 822 618 516 452
31 433   696   1,400   998 815   621   452