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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 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 2,050 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 1,040 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
5 495 489 529 1,100 2,210 3,630 2,290 826 540 504 590 600
6 492 487 532 1,130 2,270 3,650 2,230 805 535 505 596 593
7 492 485 535 1,180 2,340 3,660 2,150 785 531 503 602 586
8 495 484 538 1,220 2,410 3,650 2,080 767 529 503 606 579
9 497 487 543 1,260 2,440 3,640 2,000 748 529 505 613 568
10 499 494 547 1,290 2,480 3,610 1,930 730 527 506 612 558
11 500 503 553 1,330 2,500 3,550 1,860 714 523 508 611 556
12 498 509 560 1,360 2,530 3,470 1,790 700 522 514 616 559
13 496 512 571 1,390 2,570 3,410 1,730 687 519 520 620 560
14 495 512 584 1,440 2,630 3,370 1,670 675 515 526 624 556
15 496 511 598 1,500 2,700 3,360 1,620 668 514 528 624 552
16 498 510 621 1,530 2,770 3,350 1,560 661 514 534 619 549
17 501 510 654 1,570 2,850 3,360 1,510 652 514 537 611 546
18 509 510 680 1,600 2,950 3,360 1,450 641 516 545 605 540
19 510 510 700 1,650 3,030 3,310 1,400 632 519 551 600 533
20 508 511 718 1,690 3,090 3,260 1,350 620 523 556 593 530
21 504 516 731 1,750 3,140 3,200 1,300 614 526 560 589 528
22 502 521 742 1,810 3,200 3,140 1,260 606 527 567 587 530
23 501 524 753 1,840 3,270 3,090 1,220 603 527 572 583 541
24 500 523 773 1,870 3,320 3,060 1,170 599 524 574 586 557
25 499 518 790 1,910 3,360 3,010 1,130 595 521 572 599 560
26 497 516 805 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
28 489 515 844 1,980 3,510 2,790 1,020 582 514 581 614 543
29 483 509 872 2,000 3,510 2,700 991 575 510 582 607 536
30 479   900 2,020 3,510 2,630 963 568 508 580 600 528
31 479   934   3,500   935 564   578   521