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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 -> 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 9,990 7,390 5,750 7,780 12,800 13,800 11,800 9,250 9,150 11,500 16,100
2 11,000 10,300 7,530 5,850 8,080 13,200 14,000 11,800 8,700 9,190 11,800 16,500
3 11,300 10,100 7,760 5,790 8,100 13,600 14,300 11,600 8,770 9,250 12,100 15,800
4 11,200 9,330 7,400 5,880 8,100 13,700 13,900 11,500 8,880 9,600 12,100 16,300
5 11,800 9,270 7,110 5,930 8,080 13,600 13,500 11,200 8,810 9,690 11,700 17,000
6 11,600 9,360 6,910 5,970 8,080 13,600 13,200 11,300 8,560 9,380 11,600 16,900
7 11,600 10,300 6,960 6,000 7,820 13,800 13,000 11,200 8,410 9,300 11,600 17,100
8 11,500 10,600 7,140 6,240 7,750 14,000 12,400 11,400 8,770 9,370 12,200 17,500
9 11,800 9,960 7,180 6,160 7,650 14,400 12,200 11,500 9,400 9,370 13,000 17,400
10 11,500 9,390 6,950 6,210 7,820 14,500 12,400 11,200 9,550 9,760 13,600 16,200
11 11,700 9,610 6,280 6,520 7,850 15,200 12,400 11,100 9,110 9,880 13,500 16,800
12 12,100 8,980 5,860 6,870 7,840 15,500 12,100 10,600 8,840 10,100 13,300 17,300
13 12,400 9,120 5,820 6,910 7,990 15,300 11,600 10,600 9,030 10,200 13,100 17,600
14 12,300 9,660 5,960 6,590 8,490 15,200 11,500 10,700 9,260 10,300 13,300 17,600
15 11,600 9,720 6,080 6,690 9,100 15,500 11,800 10,500 9,540 10,200 14,000 17,300
16 11,300 9,600 6,030 6,650 10,100 15,700 11,900 10,600 9,230 10,400 14,000 17,100
17 11,000 8,910 6,020 6,680 10,900 15,300 12,200 10,900 9,370 10,700 14,700 16,800
18 10,700 8,690 5,850 6,720 11,000 15,200 11,900 10,800 9,590 10,500 14,900 16,800
19 10,400 8,410 5,710 6,640 11,200 15,100 11,500 10,500 9,230 10,800 15,300 17,100
20 9,920 8,710 5,410 6,490 11,200 14,900 11,400 10,800 9,550 10,500 15,200 16,900
21 9,830 8,870 5,560 6,540 11,600 14,700 11,500 11,000 9,730 9,890 15,400 16,800
22 10,100 8,700 5,700 6,830 12,000 14,400 11,500 10,500 9,950 9,850 14,300 17,100
23 10,500 8,880 5,690 6,880 12,500 14,600 11,400 10,500 9,520 9,990 14,100 17,100
24 10,700 8,770 5,840 6,960 12,500 14,500 11,200 10,400 9,520 10,300 13,800 15,800
25 11,000 8,490 5,760 6,990 12,300 14,500 11,400 10,300 9,820 10,300 14,100 12,800
26 10,900 8,140 5,720 7,030 12,500 14,600 11,300 9,670 9,480 10,500 13,900 13,200
27 10,500 7,900 5,680 6,950 12,300 14,000 11,100 9,420 9,660 10,400 13,800 13,700
28 10,200 7,430 5,840 7,200 12,300 13,800 11,300 9,600 9,960 10,400 14,000 14,400
29 10,300 7,120 5,800 7,520 12,500 13,900 11,400 9,430 9,850 10,700 13,900 13,900
30 10,200   5,530 7,570 12,300 13,800 11,400 9,620 9,950 10,700 14,700 12,700
31 10,300   5,710   12,300   11,800 9,580   11,100   11,900