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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 -> 2023-09-30)

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
1 513 482 520 980 2,050 3,510 2,580 916 560 506 583 599
2 507 490 520 1,020 2,090 3,530 2,530 893 557 506 584 596
3 501 494 522 1,050 2,110 3,560 2,450 871 551 506 584 598
4 499 492 526 1,080 2,140 3,600 2,380 851 547 506 588 602
5 496 489 530 1,110 2,190 3,650 2,310 830 541 506 592 602
6 494 487 533 1,140 2,250 3,660 2,240 809 536 507 598 595
7 493 486 536 1,190 2,320 3,670 2,170 788 532 504 603 588
8 496 484 539 1,230 2,380 3,670 2,090 770 530 505 606 580
9 499 487 544 1,260 2,420 3,650 2,010 751 530 507 613 569
10 501 495 548 1,300 2,460 3,620 1,940 733 527 508 613 559
11 501 503 555 1,330 2,490 3,560 1,870 717 524 510 612 557
12 500 510 562 1,360 2,520 3,480 1,800 703 523 516 617 560
13 498 513 573 1,400 2,560 3,420 1,740 690 520 522 621 561
14 497 512 585 1,440 2,620 3,380 1,680 677 516 528 625 557
15 498 511 602 1,500 2,700 3,380 1,620 671 515 530 625 553
16 500 511 625 1,540 2,760 3,360 1,570 664 515 536 619 550
17 503 511 659 1,570 2,840 3,370 1,510 655 515 540 612 547
18 511 511 685 1,610 2,940 3,370 1,460 644 518 547 605 542
19 512 511 705 1,650 3,020 3,320 1,410 635 520 554 601 535
20 510 512 723 1,700 3,080 3,280 1,360 623 525 558 594 531
21 506 517 736 1,760 3,130 3,210 1,310 616 528 562 589 529
22 504 522 747 1,810 3,190 3,160 1,270 608 529 569 588 532
23 503 526 757 1,850 3,260 3,110 1,220 605 529 574 584 542
24 501 524 777 1,880 3,310 3,070 1,180 601 526 576 587 558
25 500 520 794 1,920 3,350 3,030 1,130 596 523 575 601 562
26 498 517 810 1,950 3,410 2,960 1,100 593 519 577 617 553
27 494 515 828 1,980 3,470 2,890 1,060 589 518 582 622 549
28 490 515 850 1,990 3,510 2,800 1,030 584 515 584 617 545
29 484 510 878 2,010 3,520 2,710 995 577 512 584 609 537
30 480   907 2,030 3,510 2,640 967 569 510 583 602 529
31 480   941   3,510   939 565   581   523