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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 12370000 Swan River near Bigfork, MT


Lake County, Montana
Hydrologic Unit Code 17010211
Latitude  48°01'27.23", Longitude 113°58'43.75" NAD83
Drainage area 672  square miles
Gage datum 3,062.6 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 1921-10-01 -> 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
1 512 481 519 972 2,040 3,490 2,560 910 559 504 580 597
2 506 489 520 1,010 2,080 3,520 2,500 886 555 504 581 594
3 500 493 522 1,040 2,110 3,540 2,430 865 550 505 582 596
4 497 491 526 1,070 2,140 3,580 2,360 845 545 505 586 600
5 495 489 529 1,100 2,200 3,630 2,290 824 539 504 590 600
6 492 487 532 1,130 2,260 3,640 2,220 804 534 505 596 593
7 492 485 535 1,180 2,330 3,650 2,150 783 530 503 602 586
8 495 484 538 1,220 2,390 3,650 2,070 766 528 503 606 579
9 497 487 543 1,260 2,430 3,640 1,990 746 528 505 613 568
10 499 494 547 1,290 2,460 3,600 1,930 729 525 506 612 558
11 500 503 553 1,330 2,490 3,540 1,860 713 522 508 611 556
12 498 509 560 1,350 2,520 3,460 1,790 698 520 514 616 559
13 496 512 571 1,390 2,560 3,400 1,720 686 518 520 620 560
14 495 512 584 1,440 2,620 3,370 1,660 673 514 526 624 556
15 496 511 598 1,500 2,700 3,360 1,610 667 513 528 624 552
16 498 510 621 1,530 2,770 3,340 1,560 660 513 534 619 549
17 501 510 654 1,570 2,850 3,350 1,500 651 513 537 611 546
18 509 510 680 1,610 2,950 3,340 1,450 640 516 545 605 540
19 510 510 700 1,650 3,030 3,290 1,390 631 518 551 600 533
20 508 511 718 1,690 3,090 3,250 1,350 619 523 556 593 530
21 504 516 731 1,750 3,140 3,180 1,300 613 526 560 589 528
22 502 521 742 1,800 3,190 3,130 1,260 605 527 567 587 530
23 501 524 753 1,830 3,260 3,080 1,210 602 527 572 583 541
24 500 523 773 1,860 3,310 3,040 1,170 597 524 574 586 557
25 499 518 790 1,900 3,350 3,000 1,130 593 521 572 599 560
26 497 516 805 1,940 3,400 2,940 1,090 590 517 575 615 552
27 493 515 823 1,960 3,460 2,860 1,050 585 516 579 620 547
28 489 515 844 1,980 3,500 2,780 1,020 581 514 581 614 543
29 483 509 872 1,990 3,500 2,690 987 574 510 582 607 536
30 479   900 2,010 3,490 2,620 960 567 508 580 600 528
31 479   934   3,490   932 563   578   521