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Water-Year Summary for Site 12396500

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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)  
00065 Gage height(Mean) [AUXILIARY GAGE]  
00065 Gage height(Mean) [BASE GAGE]  

Water year 2020: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 48°46'52", long 117°24'55" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.19, T.38 N., R.43 E., Pend Oreille County, WA, Hydrologic Unit 17010216, on left bank 1,000 ft downstream from Box Canyon Dam, 2.8 mi north of Ione, and at mile 34.3. AUXILLIARY GAGE: Lat 48°47'35", long 117°25'13", in NW 1/4 SE 1/4 sec. 18, T. 38 N., R. 43 E., Pend Oreille County, Hydrologic Unit 17010216, on left bank 1.2 mi downstream from base gage near cable.
DRAINAGE AREA - 24,900 mi².
REVISIONS HISTORY - WSP 1933: Drainage area. WSP 2133:1969. WDR WA-81-2: 1976.
PERIOD OF RECORD - October 1952 to current year.
GAGE - Water-stage recorder. Datum of gage is 1900 ft above NGVD of 1929. Prior to Mar. 29, 1954, nonrecording gage at site 300 ft upstream at same datum. Mar. 29 to Aug. 25, 1954, nonrecording gage at present site and datum. Since Aug. 20, 1967, auxiliary water-stage recorder 1.2 mi downstream at same datum.
REMARKS - Flow regulated by Box Canyon Reservoir, 1,000 ft upstream, since June 1955 and by Pend Oreille Lake, Flathead Lake, Hungry Horse Reservoir, and by several smaller reservoirs and powerplants. Numerous diversions upstream from station for irrigation. U.S. Geological Survey satellite telemeter at station.
  • Water Year 2014: Records poor.
  • Water Years 2015, 2016: Records fair.
  • Water Years 2017 to 2019: Records good except for estimated daily discharges, which are fair.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 1948 reached an elevation of 2,018.00 ft, from floodmarks, discharge, 167,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 136,000 ft³/s June 13, 14, 1972; maximum daily elevation, 2,015.44 ft June 5, 7, 1997 (mean of surge), (backwater from Boundary Dam); minimum daily discharge, 82 ft³/s Oct. 5, 1985 (result of regulation).