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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).

Updated June 11, 2020 - USGS water-resources monitoring activities will be restored at the following sites:
  • 12323600 Silver Bow Creek at Opportunity, Montana (POR: 31 years)
  • 12323750 Silver Bow Creek at Warm Springs, Montana (POR: 35 years)

Updated May 12, 2020 - USGS water-resources monitoring activities were suspended effective June 1, 2020 at the following site:
  • 06088500 Muddy Creek near Vaughn, Montana (POR: 82 years)
USGS monitoring activities at this site was funded by our partner and USGS Cooperative Matching Funds (06088500). Lack of partner funding for this site resulted in suspension of all USGS monitoring activities. Efforts are ongoing to secure funding for future monitoring. Historical data will continue to be available from USGS.

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 -> 2020-09-30)

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 10,600 10,200 7,650 5,880 7,840 12,200 13,800 12,000 9,340 9,400 12,000 16,100
2 11,100 10,600 7,810 5,990 8,100 12,900 14,100 12,000 8,760 9,470 12,300 16,600
3 11,500 10,400 8,060 5,920 8,080 13,300 14,300 11,800 8,830 9,580 12,500 15,800
4 11,500 9,540 7,670 6,020 8,080 13,500 13,900 11,700 8,930 9,990 12,700 16,400
5 12,100 9,480 7,360 6,080 7,860 13,300 13,500 11,400 8,840 10,100 12,200 17,100
6 11,900 9,570 7,130 6,120 7,870 13,400 13,100 11,400 8,580 9,770 12,100 17,000
7 11,900 10,600 7,190 6,160 7,530 13,700 12,900 11,400 8,410 9,720 12,000 17,100
8 11,800 10,900 7,380 6,410 7,450 14,000 12,300 11,500 8,800 9,800 12,500 17,500
9 12,100 10,200 7,430 6,320 7,340 14,300 12,100 11,600 9,490 9,800 13,000 17,300
10 11,800 9,630 7,180 6,380 7,530 14,300 12,300 11,300 9,660 10,200 13,500 16,200
11 11,900 9,850 6,460 6,710 7,570 15,200 12,300 11,300 9,180 10,300 13,500 16,600
12 12,300 9,200 6,000 7,100 7,560 15,400 12,000 10,800 8,880 10,600 13,400 17,100
13 12,600 9,350 5,950 7,140 7,650 15,300 11,500 10,700 9,090 10,700 13,300 17,300
14 12,500 9,760 6,110 6,800 7,810 15,300 11,500 10,800 9,370 10,800 13,500 17,300
15 11,800 9,820 6,240 6,900 8,340 15,700 11,700 10,600 9,670 10,700 14,100 17,000
16 11,400 9,730 6,180 6,860 9,060 15,800 11,900 10,700 9,340 10,900 14,300 16,800
17 11,000 9,000 6,180 6,890 9,730 15,400 12,200 11,100 9,490 11,200 14,900 16,500
18 10,600 8,770 5,990 6,900 9,820 15,300 12,000 11,000 9,740 11,100 15,000 16,500
19 10,200 8,640 5,840 6,810 10,000 15,200 11,600 10,700 9,340 11,400 15,500 16,800
20 9,850 8,970 5,520 6,640 10,100 15,000 11,500 11,000 9,690 11,000 15,300 16,500
21 9,860 8,980 5,680 6,700 10,500 14,800 11,600 11,200 9,880 10,400 15,600 16,300
22 10,200 8,780 5,830 7,010 10,900 14,500 11,700 10,600 10,100 10,300 14,400 16,600
23 10,400 8,980 5,820 7,060 11,400 14,700 11,500 10,700 9,690 10,500 14,100 16,700
24 10,600 8,820 5,980 7,140 11,500 14,700 11,400 10,600 9,690 10,800 13,800 15,400
25 10,800 8,530 5,890 7,150 11,300 14,600 11,500 10,400 10,000 10,800 14,000 12,500
26 10,700 8,340 5,850 7,180 11,500 14,700 11,500 9,780 9,650 11,000 13,900 13,000
27 10,400 8,150 5,810 7,090 11,400 14,100 11,200 9,510 9,840 11,000 13,700 13,500
28 10,200 7,680 5,980 7,350 11,400 13,800 11,400 9,710 10,200 10,900 13,900 14,100
29 10,400 7,350 5,930 7,680 11,600 14,000 11,500 9,520 10,100 11,200 14,100 13,800
30 10,300   5,640 7,730 11,400 13,800 11,600 9,730 10,200 11,300 14,700 12,800
31 10,400   5,840   11,500   12,000 9,690   11,700   12,000