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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 -> 2021-09-30)

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
1 513 484 522 974 2,070 3,510 2,580 919 562 508 585 600
2 507 492 522 1,010 2,110 3,540 2,520 895 559 508 586 597
3 501 496 522 1,050 2,120 3,560 2,450 873 553 508 586 598
4 499 494 523 1,080 2,150 3,600 2,380 853 549 508 589 602
5 497 491 525 1,100 2,200 3,640 2,310 831 542 508 593 601
6 494 489 527 1,140 2,260 3,650 2,240 811 538 509 599 594
7 493 487 531 1,180 2,320 3,660 2,170 790 534 507 604 587
8 496 486 535 1,230 2,380 3,650 2,090 772 532 508 608 579
9 499 489 540 1,260 2,420 3,650 2,010 752 532 509 615 568
10 502 497 546 1,300 2,460 3,610 1,940 734 530 510 615 558
11 502 505 553 1,330 2,500 3,550 1,870 718 526 513 614 557
12 501 512 561 1,360 2,530 3,470 1,800 704 525 519 620 559
13 498 515 573 1,400 2,580 3,400 1,740 691 522 525 624 560
14 498 515 586 1,450 2,640 3,360 1,680 679 518 531 627 557
15 498 514 600 1,510 2,720 3,360 1,630 672 517 533 625 553
16 501 514 624 1,550 2,780 3,340 1,570 665 517 539 618 550
17 504 515 658 1,580 2,870 3,350 1,520 657 517 543 609 548
18 512 515 684 1,620 2,960 3,360 1,460 646 520 551 603 542
19 513 514 704 1,670 3,040 3,300 1,410 637 523 558 599 536
20 511 516 721 1,720 3,090 3,250 1,360 624 527 563 593 532
21 507 520 733 1,780 3,150 3,180 1,310 618 531 567 589 531
22 505 525 744 1,830 3,210 3,120 1,270 609 531 573 588 533
23 504 529 755 1,870 3,280 3,080 1,220 606 530 578 584 544
24 503 528 774 1,900 3,330 3,050 1,180 602 528 580 587 561
25 502 523 790 1,940 3,370 3,010 1,140 598 524 578 602 564
26 500 520 805 1,980 3,400 2,950 1,100 594 521 581 618 555
27 496 519 823 2,000 3,460 2,880 1,060 589 520 585 623 550
28 491 519 845 2,010 3,500 2,790 1,030 585 517 587 618 546
29 486 510 873 2,030 3,500 2,710 998 578 514 587 610 537
30 483   900 2,050 3,500 2,640 970 570 511 585 603 529
31 482   935   3,500   941 566   584   522