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USGS Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).

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 45 - 46 years of record in, ft3/s   (Calculation Period 1971-10-01 -> 2017-09-30)

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 10,900 10,800 7,760 5,540 7,270 11,700 14,100 12,300 9,450 9,690 12,200 16,100
2 11,200 11,100 7,930 5,670 7,560 12,300 14,400 12,200 8,830 9,820 12,800 16,400
3 11,700 10,900 8,200 5,590 7,540 12,700 14,600 12,000 8,970 9,940 13,200 15,500
4 11,700 9,930 7,740 5,710 7,530 12,900 14,200 11,900 9,110 10,400 13,400 15,800
5 12,300 9,820 7,220 5,810 7,540 12,700 13,800 11,600 9,030 10,500 12,800 16,700
6 12,200 9,830 6,940 5,860 7,630 12,800 13,400 11,600 8,750 10,100 12,700 16,500
7 12,300 10,700 7,000 5,910 7,290 13,100 13,200 11,600 8,570 10,100 12,400 16,900
8 12,300 11,000 7,210 6,180 7,200 13,400 12,500 11,800 8,980 10,200 12,800 17,400
9 12,700 10,300 7,270 6,080 7,080 13,900 12,400 11,900 9,720 10,200 13,300 17,200
10 12,300 9,680 7,100 6,140 7,290 13,800 12,500 11,500 9,900 10,600 13,900 15,700
11 12,400 9,910 6,320 6,510 7,270 14,700 12,600 11,500 9,390 10,800 13,800 16,200
12 12,700 9,120 5,780 6,930 7,210 15,100 12,300 10,900 9,070 11,000 13,600 16,700
13 13,000 9,150 5,740 6,980 7,270 15,000 11,700 10,800 9,300 11,100 13,400 16,900
14 13,100 9,560 5,940 6,600 7,380 15,000 11,600 11,000 9,590 11,200 13,500 17,100
15 12,400 9,630 6,100 6,710 7,790 15,400 11,900 10,800 9,920 11,200 14,200 17,100
16 11,900 9,560 6,040 6,680 8,440 15,600 12,100 10,900 9,560 11,400 14,500 16,700
17 11,200 8,970 6,040 6,710 9,150 15,200 12,500 11,200 9,730 11,700 15,200 16,200
18 10,800 8,720 5,790 6,740 9,220 15,200 12,200 11,100 9,980 11,500 15,300 16,100
19 10,400 8,390 5,420 6,650 9,370 15,100 11,900 10,800 9,560 11,800 15,800 16,500
20 10,200 8,710 5,270 6,460 9,450 14,900 11,700 11,200 9,930 11,400 15,600 16,200
21 10,200 8,720 5,410 6,500 9,870 14,800 11,900 11,400 10,100 10,800 16,000 16,000
22 10,500 8,570 5,230 6,810 10,400 14,600 11,900 10,800 10,400 10,700 14,700 16,500
23 10,600 8,870 5,210 6,830 11,000 14,800 11,700 10,800 9,940 10,900 14,400 16,400
24 10,700 8,790 5,480 6,830 11,000 14,800 11,600 10,700 9,930 11,200 14,100 15,100
25 11,000 8,470 5,380 6,820 10,800 14,800 11,700 10,500 10,300 11,200 14,300 12,100
26 10,900 8,220 5,340 6,800 11,000 15,000 11,700 9,880 9,890 11,500 13,900 12,500
27 10,900 8,160 5,300 6,680 10,900 14,400 11,400 9,590 10,100 11,400 13,600 13,000
28 10,600 7,720 5,490 6,880 10,900 14,100 11,600 9,800 10,500 11,100 13,600 14,100
29 10,900 7,530 5,470 7,190 11,100 14,300 11,800 9,600 10,300 11,400 13,600 14,100
30 10,800   5,250 7,240 10,800 14,100 11,800 9,830 10,500 11,400 14,500 13,200
31 11,000   5,490   10,900   12,300 9,780   11,900   12,400