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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 12301933 Kootenai River bl Libby Dam nr Libby MT


Lincoln County, Montana
Hydrologic Unit Code 17010101
Latitude  48°24'02.39", Longitude 115°19'07.39" NAD83
Drainage area 8,999  square miles
Gage datum 2,100 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 1971-10-01 -> 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 10,400 9,880 7,390 5,750 7,780 12,800 13,700 11,800 9,230 9,120 11,400 15,900
2 10,900 10,200 7,530 5,850 8,080 13,200 13,900 11,800 8,680 9,170 11,700 16,300
3 11,200 10,000 7,760 5,790 8,100 13,600 14,200 11,500 8,750 9,230 12,000 15,700
4 11,100 9,230 7,400 5,880 8,100 13,700 13,800 11,500 8,860 9,570 12,100 16,100
5 11,700 9,180 7,110 5,930 8,080 13,600 13,500 11,200 8,790 9,630 11,700 16,800
6 11,500 9,290 6,910 5,970 8,080 13,600 13,100 11,200 8,550 9,320 11,600 16,700
7 11,500 10,200 6,960 6,000 7,820 13,800 12,900 11,200 8,400 9,250 11,700 17,000
8 11,400 10,500 7,140 6,240 7,750 14,000 12,400 11,300 8,750 9,310 12,200 17,400
9 11,700 9,890 7,180 6,160 7,650 14,400 12,200 11,400 9,380 9,320 13,000 17,400
10 11,400 9,340 6,950 6,210 7,820 14,300 12,400 11,100 9,520 9,690 13,500 16,400
11 11,600 9,610 6,280 6,520 7,850 15,100 12,400 11,100 9,090 9,810 13,500 16,900
12 11,900 8,980 5,860 6,870 7,840 15,300 12,100 10,600 8,820 10,000 13,300 17,500
13 12,300 9,120 5,820 6,910 7,990 15,200 11,600 10,500 9,010 10,100 13,200 17,700
14 12,200 9,660 5,960 6,590 8,490 15,100 11,600 10,600 9,230 10,200 13,300 17,700
15 11,500 9,720 6,080 6,690 9,100 15,400 11,800 10,500 9,510 10,200 14,000 17,400
16 11,200 9,600 6,030 6,650 10,100 15,500 11,900 10,500 9,200 10,300 13,900 17,200
17 10,900 8,910 6,020 6,680 10,900 15,100 12,200 10,900 9,340 10,600 14,600 16,900
18 10,700 8,690 5,850 6,720 11,000 15,100 11,900 10,700 9,560 10,500 15,000 16,900
19 10,300 8,410 5,710 6,640 11,200 15,000 11,600 10,400 9,200 10,700 15,400 17,200
20 9,860 8,710 5,410 6,490 11,200 14,800 11,400 10,700 9,520 10,400 15,300 17,000
21 9,760 8,870 5,560 6,540 11,600 14,600 11,500 10,900 9,690 9,790 15,500 17,000
22 10,000 8,700 5,700 6,830 12,000 14,300 11,600 10,400 9,910 9,750 14,400 17,200
23 10,400 8,880 5,690 6,880 12,500 14,400 11,400 10,500 9,490 9,890 14,100 17,200
24 10,600 8,770 5,840 6,960 12,500 14,400 11,300 10,400 9,490 10,200 13,800 15,900
25 10,900 8,490 5,760 6,990 12,300 14,400 11,400 10,200 9,790 10,100 14,000 13,100
26 10,800 8,140 5,720 7,030 12,500 14,500 11,300 9,640 9,450 10,400 13,900 13,500
27 10,400 7,900 5,680 6,950 12,300 14,000 11,100 9,390 9,620 10,300 13,800 13,900
28 10,100 7,430 5,840 7,200 12,300 13,700 11,300 9,570 9,920 10,300 13,900 14,500
29 10,200 7,120 5,800 7,520 12,500 13,900 11,400 9,400 9,810 10,600 13,900 13,900
30 10,100   5,530 7,570 12,300 13,700 11,400 9,590 9,920 10,600 14,600 12,700
31 10,200   5,710   12,300   11,800 9,550   11,000   11,900