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USGS Surface-Water 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
1 512 481 520 975 2,050 3,500 2,570 912 560 504 580 597
2 506 489 520 1,010 2,090 3,530 2,510 888 556 504 581 594
3 500 493 522 1,050 2,120 3,550 2,440 867 551 505 582 596
4 497 491 526 1,070 2,160 3,590 2,370 847 547 505 586 600
5 495 489 530 1,100 2,210 3,630 2,290 826 540 504 590 600
6 492 487 533 1,130 2,270 3,650 2,230 805 535 505 596 593
7 492 485 536 1,180 2,340 3,660 2,150 785 531 503 602 586
8 495 484 539 1,220 2,410 3,650 2,080 767 529 503 606 579
9 497 487 544 1,260 2,440 3,640 2,000 748 529 505 613 568
10 499 494 548 1,290 2,480 3,610 1,930 730 527 506 612 558
11 500 503 555 1,330 2,500 3,550 1,860 714 523 508 611 556
12 498 510 562 1,360 2,530 3,470 1,790 700 522 514 616 559
13 496 513 573 1,390 2,570 3,410 1,730 687 519 520 620 560
14 495 512 585 1,440 2,630 3,370 1,670 675 515 526 624 556
15 496 511 599 1,500 2,700 3,360 1,620 668 514 528 624 552
16 498 511 622 1,530 2,770 3,350 1,560 661 514 534 619 549
17 501 511 656 1,570 2,850 3,360 1,510 652 514 537 611 546
18 509 511 682 1,600 2,950 3,360 1,450 641 516 545 605 540
19 510 511 702 1,650 3,030 3,310 1,400 632 519 551 600 533
20 508 512 719 1,690 3,090 3,260 1,350 620 523 556 593 530
21 504 517 732 1,750 3,140 3,200 1,300 614 526 560 589 528
22 502 522 743 1,810 3,200 3,140 1,260 606 527 567 587 530
23 501 526 753 1,840 3,270 3,090 1,220 603 527 572 583 541
24 500 524 773 1,870 3,320 3,060 1,170 599 524 574 586 557
25 499 520 790 1,910 3,360 3,010 1,130 595 521 572 599 560
26 497 517 805 1,940 3,410 2,950 1,090 591 517 575 615 552
27 493 515 823 1,970 3,480 2,870 1,060 587 516 579 620 547
28 489 515 845 1,980 3,510 2,790 1,020 582 514 581 614 543
29 483 510 873 2,000 3,510 2,700 991 575 510 582 607 536
30 479   901 2,020 3,510 2,630 963 568 508 580 600 528
31 479   936   3,500   935 564   578   521