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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
1 513 484 522 973 2,060 3,510 2,580 919 562 508 585 600
2 507 492 521 1,010 2,100 3,540 2,520 895 559 508 586 597
3 501 496 521 1,050 2,120 3,560 2,450 873 553 508 586 598
4 499 494 522 1,080 2,150 3,600 2,380 853 549 508 589 602
5 497 491 524 1,100 2,200 3,640 2,310 831 542 508 593 601
6 494 489 526 1,140 2,260 3,650 2,240 811 538 509 599 594
7 493 487 530 1,180 2,320 3,660 2,170 790 534 507 604 587
8 496 486 534 1,230 2,380 3,650 2,090 772 532 508 608 579
9 499 489 539 1,260 2,420 3,650 2,010 752 532 509 615 568
10 502 497 545 1,300 2,460 3,610 1,940 734 530 510 615 558
11 502 505 552 1,330 2,500 3,550 1,870 718 526 513 614 557
12 501 512 560 1,360 2,530 3,470 1,800 704 525 519 620 559
13 498 515 572 1,400 2,580 3,400 1,740 691 522 525 624 560
14 498 515 584 1,450 2,640 3,360 1,680 679 518 531 627 557
15 498 514 599 1,510 2,720 3,360 1,630 672 517 533 625 553
16 501 513 622 1,540 2,780 3,340 1,570 665 517 539 618 550
17 504 514 656 1,580 2,870 3,350 1,520 657 517 543 609 548
18 512 514 682 1,620 2,960 3,360 1,460 646 520 551 603 542
19 513 513 702 1,660 3,040 3,300 1,410 637 523 558 599 536
20 511 515 720 1,710 3,090 3,250 1,360 624 527 563 593 532
21 507 519 732 1,770 3,150 3,180 1,310 618 531 567 589 531
22 505 524 744 1,820 3,210 3,120 1,270 609 531 573 588 533
23 504 528 754 1,860 3,280 3,080 1,220 606 530 578 584 544
24 503 527 773 1,890 3,330 3,050 1,180 602 528 580 587 561
25 502 522 790 1,930 3,370 3,010 1,140 598 524 578 602 564
26 500 520 805 1,970 3,400 2,950 1,100 594 521 581 618 555
27 496 518 822 1,990 3,460 2,880 1,060 589 520 585 623 550
28 491 518 844 2,000 3,500 2,790 1,030 585 517 587 618 546
29 486 510 872 2,020 3,500 2,710 998 578 514 587 610 537
30 483   899 2,040 3,500 2,640 970 570 511 585 603 529
31 482   934   3,500   941 566   584   522