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Water-Year Summary for Site 12301933

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Min.,Mean,Max.)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Mean,Max.,Min.)  
00300 Dissolved oxygen(Mean,Min.,Max.)  
00301 Diss oxygen,%saturtn(Max.,Min.,Mean)  
00400 pH(Max.,Med.,Min.)  
63680 Turbidity, Form Neph(Mean,Min.,Max.)  

Water year 2022: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 48°24'02.39", long 115°19'07.39" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SW 1/4 sec.33, T.31 N., R.29 W., Lincoln County, MT, Hydrologic Unit 17010101, Kootenai National Forest, on right bank 0.7 mi downstream from Libby Dam, 2.8 mi upstream from Fisher River, 11 mi east of Libby, and at river mile 221.4.
DRAINAGE AREA - 8,999 mi².
PERIOD OF RECORD - October 1971 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,100 ft, referenced to the National Geodetic Vertical Datum of 1929 (U.S. Army Corps of Engineers bench mark). Prior to Feb. 13, 1974, nonrecording gage at site 0.4 mi upstream at same elevation.
10-23-2018 to 01-15-2020: records are good, except estimated records are fair.
10-04-2017 to 10-22-2018: records are good, except estimated records are fair.
11-02-2016 to 10-03-2017: records are good.
10-27-2015 to 11-01-2016: records are good.
10-08-2014 to 10-26-2015: records are good. 
10-01-2013 to 10-07-2014: records are good. 

Flow has been completely regulated by Lake Koocanusa since Mar. 21, 1972. Diversions for irrigation 
include about 13,000 acres from tributaries in Canada and the United States that are upstream from the