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Water-Year Summary for Site 12302055

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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
00060 Discharge(Mean)  

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

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USGS Water-Year Summary 2023
LOCATION - Lat 48°21'20.17", long 115°18'52.74" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NW 1/4 sec.21, T.30 N., R.29 W., Lincoln County, MT, Hydrologic Unit 17010102, on left bank 0.8 mi upstream from mouth and 11.4 mi east of Libby.
DRAINAGE AREA - 842 mi².
PERIOD OF RECORD - October 1967 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,134.10 ft, referenced to the National Geodetic Vertical Datum of 1929 (U.S. Army Corps of Engineers bench mark). U.S. Army Corps of Engineers satellite telemeter is located at the station.


EXTREMES OUTSIDE PERIOD OF RECORD - Flood on about May 22, 1948, reached a discharge of 6,560 ft³/s, by slope-area measurement at site 0.5 mi upstream.