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USGS Surface-Water Daily Statistics for the Nation

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 -> 2024-09-30)

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
1 455 442 523 680 888 1,360 1,390 976 799 779 615 508
2 455 445 527 689 892 1,390 1,340 977 804 769 611 501
3 454 446 529 693 908 1,430 1,310 973 816 762 606 493
4 450 446 530 723 949 1,450 1,300 941 821 768 603 483
5 447 448 531 723 965 1,440 1,290 915 811 761 601 477
6 445 446 528 717 976 1,450 1,260 918 802 751 602 475
7 445 448 529 711 990 1,490 1,240 944 798 746 601 473
8 443 450 533 708 1,000 1,510 1,230 948 802 742 600 472
9 441 457 531 707 1,020 1,520 1,220 924 807 740 597 469
10 440 459 531 709 1,040 1,590 1,210 931 807 744 595 466
11 440 461 535 710 1,070 1,650 1,210 954 808 750 596 467
12 439 462 534 715 1,100 1,660 1,210 953 810 747 596 468
13 439 467 530 713 1,120 1,700 1,190 944 808 740 597 468
14 439 470 533 720 1,120 1,720 1,170 915 802 734 596 468
15 439 473 543 727 1,110 1,700 1,160 874 795 727 592 467
16 439 477 560 746 1,130 1,660 1,150 871 784 716 588 465
17 440 480 574 750 1,140 1,610 1,120 869 787 701 584 462
18 440 481 583 756 1,150 1,580 1,080 872 794 689 579 460
19 440 485 593 761 1,170 1,560 1,070 871 801 681 577 459
20 440 488 595 776 1,200 1,520 1,080 866 799 666 574 459
21 439 492 611 794 1,220 1,510 1,070 854 795 653 572 459
22 439 497 627 800 1,230 1,500 1,060 839 795 648 568 458
23 439 497 638 805 1,240 1,490 1,050 834 800 649 567 458
24 439 495 652 805 1,240 1,480 1,050 827 802 643 565 459
25 440 493 662 807 1,250 1,500 1,020 829 796 631 563 458
26 440 492 668 823 1,280 1,470 1,020 829 795 626 557 459
27 440 488 679 837 1,310 1,440 1,010 819 795 627 554 458
28 440 490 686 842 1,340 1,420 987 811 795 620 545 457
29 440 439 687 851 1,350 1,400 982 806 797 614 527 457
30 440   686 885 1,360 1,400 982 807 805 612 515 456
31 438   690   1,370   983 802   615   456