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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 12388700 Flathead River at Perma MT


Sanders County, Montana
Hydrologic Unit Code 17010212
Latitude  47°22'00.45", Longitude 114°35'06.00" NAD83
Drainage area 9,024  square miles
Contributing drainage area 9,004  square miles
Gage datum 2,469.3 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 1983-10-01 -> 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 10,500 9,790 9,230 8,970 14,100 24,400 21,500 8,930 6,780 7,700 8,750 9,560
2 10,400 9,880 9,270 8,950 14,200 24,500 20,600 8,770 6,780 7,770 8,920 9,640
3 10,500 9,700 9,300 8,920 14,500 24,500 20,800 8,530 6,690 7,730 8,950 9,900
4 10,300 9,770 9,150 8,960 14,700 24,500 20,200 8,310 6,530 7,920 9,100 10,200
5 10,200 9,670 9,090 9,090 15,000 24,800 19,700 8,130 6,720 7,900 9,080 10,300
6 10,200 9,590 9,090 9,270 15,200 25,400 19,000 7,900 6,810 8,000 8,810 10,400
7 10,200 9,600 9,020 9,270 15,600 26,000 18,100 7,720 6,790 7,910 8,710 10,300
8 10,200 9,620 8,940 9,400 15,900 26,700 17,100 7,710 6,760 7,940 8,680 10,500
9 10,200 9,710 8,920 9,540 16,200 27,400 15,800 7,430 6,820 7,810 8,740 10,600
10 9,910 9,600 8,850 9,630 16,600 27,400 15,000 7,280 6,950 7,730 8,850 10,700
11 9,870 9,580 8,760 9,780 16,900 26,800 14,400 7,170 6,820 7,700 9,030 10,800
12 9,950 9,630 8,860 9,920 17,400 26,300 13,900 7,050 6,780 7,620 9,150 10,700
13 9,860 9,710 8,770 10,100 17,700 26,100 13,800 7,160 6,820 7,620 9,160 10,600
14 9,770 9,660 8,770 10,200 17,900 25,900 13,500 7,060 6,840 7,610 9,190 10,700
15 9,910 9,700 8,790 10,300 18,400 25,300 13,000 7,120 6,950 7,570 9,290 10,800
16 10,100 9,630 8,740 10,400 18,800 25,000 12,800 7,120 6,870 7,520 9,390 10,900
17 10,200 9,630 8,750 10,500 19,300 25,900 12,800 7,030 6,740 7,470 9,360 10,900
18 10,100 9,570 8,650 10,600 19,700 26,100 12,300 7,040 6,890 7,560 9,410 10,900
19 9,940 9,480 8,760 10,700 20,100 25,900 11,700 7,060 7,070 7,570 9,540 10,700
20 9,970 9,530 8,680 10,900 20,300 25,500 11,400 7,090 7,000 7,450 9,570 10,800
21 9,960 9,510 8,680 11,100 20,300 25,100 11,100 7,160 7,110 7,400 9,570 10,900
22 10,000 9,420 8,720 11,300 20,600 25,700 10,600 7,010 7,160 7,440 9,590 10,800
23 10,100 9,230 8,840 11,500 21,000 25,400 10,600 6,950 7,280 7,440 9,500 10,700
24 10,000 9,310 8,810 11,900 21,200 24,400 10,200 6,990 7,410 7,400 9,340 10,600
25 9,950 9,620 8,790 12,200 21,600 23,900 10,000 6,990 7,360 7,540 9,500 10,400
26 9,860 9,520 8,610 12,600 22,200 23,600 9,920 7,060 7,490 7,740 9,520 10,300
27 9,750 9,440 8,700 12,800 22,700 23,100 9,540 7,050 7,570 7,900 9,490 10,400
28 9,700 9,280 8,900 13,100 23,400 22,700 9,760 6,980 7,620 7,890 9,400 10,600
29 9,740 9,630 8,960 13,400 23,400 22,400 9,540 6,890 7,580 8,190 9,460 10,600
30 9,780   8,940 13,900 23,400 21,700 9,410 7,160 7,490 8,330 9,530 10,700
31 9,770   8,880   24,000   9,170 6,900   8,570   10,600