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Water-Year Summary for Site 13185000

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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.
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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2021
LOCATION - Lat 43°40'05", long 115°43'31" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 SE 1/4 sec.22, T.4 N., R.6 E., Boise County, ID, Hydrologic Unit 17050112, Twin Springs quad., Boise National Forest, on right bank 0.6 mi downstream from Badger Creek, 2.6 mi upstream from maximum flow line of Arrowrock Reservoir, 2.1 mi downstream from Twin Springs, 14 mi upstream from Arrowrock Dam, and at mile 89.5.
DRAINAGE AREA - 832 mi².
REVISIONS HISTORY - WDR-US-2010: Drainage area.
PERIOD OF RECORD - March 1911 to current year.
GAGE - Water-stage recorder. Gage datum is arbitrary. March 1911 to Apr. 3, 1915, nonrecording gage, and Apr. 4, 1915 to Sept. 30, 1965, water-stage recorder at site 1.3 mi downstream at datum 3,250.44 ft above NGVD of 1929; Oct. 1, 1965 to Aug. 24, 2009 and Sept. 30, 2009 to Sept. 27, 2010, water-stage recorder at site 1.0 mi downstream at datum 3,255.70 ft above NGVD of 1929.
REMARKS - No diversion or regulation above station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 18,800 ft³/s Dec. 23, 1964, gage height, 12.20 ft, from floodmark (site and datum then in use); minimum, 105 ft³/s Nov. 28, 1976, gage height, 2.64 ft; minimum gage height, 1.48 ft, Dec. 6, 7, 1960 (site and datum then in use).