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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 12372000 Flathead River near Polson MT


Lake County, Montana
Hydrologic Unit Code 17010212
Latitude  47°40'49.03", Longitude 114°14'48.22" NAD83
Drainage area 7,079  square miles
Gage datum 2,692.7 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 1938-10-01 -> 2025-09-30)

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 9,370 9,910 8,970 8,070 14,600 27,700 21,700 7,850 5,710 6,920 8,060 8,560
2 9,820 9,740 8,900 8,150 14,800 27,100 21,100 7,610 5,560 6,850 8,180 8,650
3 9,990 9,660 8,850 8,170 14,900 26,900 20,900 7,660 5,730 7,020 8,140 8,950
4 9,940 9,570 8,800 8,150 15,200 27,200 20,100 7,290 5,910 7,040 8,180 9,180
5 10,100 9,600 8,770 8,360 15,600 27,700 19,800 7,200 5,900 7,020 7,960 9,370
6 9,980 9,720 8,770 8,380 15,900 28,100 19,500 7,020 5,840 7,060 7,880 9,300
7 9,980 9,700 8,560 8,390 16,200 28,500 18,800 7,060 6,020 7,140 8,000 9,390
8 9,940 9,660 8,500 8,570 16,500 29,100 17,700 6,720 5,990 7,100 7,990 9,630
9 10,100 9,620 8,490 8,730 17,100 29,000 16,800 6,590 6,140 7,020 8,090 9,830
10 10,200 9,610 8,540 8,920 17,600 28,700 16,100 6,530 6,270 7,070 7,980 9,990
11 10,300 9,520 8,590 9,010 18,300 28,400 15,500 6,310 6,060 7,110 8,030 9,960
12 10,100 9,520 8,670 9,030 18,700 28,100 14,700 6,440 6,040 7,100 8,030 9,940
13 10,200 9,550 8,630 9,300 18,900 28,100 14,600 6,290 6,090 6,940 8,090 10,000
14 10,100 9,620 8,680 9,540 19,400 27,900 14,400 6,270 6,110 7,010 8,150 10,100
15 10,000 9,650 8,580 9,860 19,900 27,500 13,900 6,200 6,150 7,080 8,280 10,300
16 10,200 9,560 8,370 9,980 20,300 27,400 13,700 6,080 5,990 7,160 8,550 10,400
17 10,000 9,440 8,320 10,200 20,700 27,500 13,200 5,890 6,040 7,140 8,530 10,300
18 9,820 9,420 8,230 10,500 21,200 27,400 11,600 5,850 6,320 7,300 8,530 10,100
19 9,800 9,460 8,350 10,600 21,600 26,900 11,200 5,900 6,170 7,200 8,480 10,200
20 9,970 9,550 8,290 11,000 21,800 26,900 11,100 5,960 6,360 7,360 8,510 10,300
21 9,860 9,570 8,290 11,400 22,200 27,200 10,900 5,930 6,400 7,610 8,550 10,300
22 9,970 9,390 8,330 11,700 22,700 26,800 10,600 5,920 6,490 7,710 8,500 9,970
23 10,100 9,360 8,110 12,000 23,200 25,600 10,100 5,840 6,550 7,630 8,370 9,930
24 10,100 9,440 8,080 12,300 23,800 25,200 9,890 5,910 6,740 7,580 8,330 9,630
25 10,100 9,380 7,970 12,700 24,200 24,600 9,570 5,870 6,690 7,650 8,470 9,270
26 9,970 9,390 7,980 12,900 24,700 23,900 9,180 5,920 6,700 7,750 8,450 9,500
27 9,900 9,290 8,050 13,300 25,600 23,600 9,170 5,840 6,850 7,840 8,440 9,920
28 9,790 9,120 8,080 13,600 26,000 23,700 9,020 5,730 6,750 7,820 8,420 10,000
29 9,870 8,460 8,090 14,000 26,000 23,400 8,910 5,880 6,620 7,980 8,510 9,940
30 9,920   8,020 14,400 26,600 22,500 8,580 5,800 6,800 8,010 8,510 9,790
31 9,890   8,080   27,400   8,270 5,820   8,010   9,640