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Water-Year Summary for Site 12105900

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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: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 47°17'02", long 121°47'48" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.28, T.21 N., R.8 E., King County, WA, Hydrologic Unit 17110013, on right bank 0.7 mi upstream from Bear Creek, 0.7 mi downstream from Howard A. Hanson Dam, 5.0 mi southeast of Palmer, and at mile 63.8.
DRAINAGE AREA - 221 mi².
PERIOD OF RECORD - October 1960 (monthly discharge only), November 1960 to current year.
GAGE - Water-stage recorder. Elevation of gage is 990 ft above NGVD of 1929, from topographic map.  
REMARKS - Flow regulated by Howard A. Hanson Reservoir (station 12105800) for flood control and during summer months to augment the natural river flow.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,200 ft³/s, Feb. 21, 1961, gage height, 14.40 ft; minimum discharge, 87 ft³/s, Dec. 29, 1961, Jan. 7, 2009.