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Water-Year Summary for Site 14209500

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

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USGS Water-Year Summary 2021
LOCATION - Lat 45°07'30", long 122°04'20" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.21, T.5 S., R.6 E., Clackamas County, OR, Hydrologic Unit 17090011, Mount Hood National Forest, on right bank, 0.1 mi upstream from Three Lynx Creek, 0.25 mi downstream from powerplant, 17 mi southeast of Estacada and at mile 47.8.
DRAINAGE AREA - 479 mi².
REVISIONS HISTORY - WSP 1148: Drainage area. WSP 1248: 1910(M), 1912, 1948-50(M).
PERIOD OF RECORD - April 1909 to December 1913, October 1921 to current year. Prior to October 1911 monthly discharge only, published in WSP 1318.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,091.69 ft above NGVD of 1929 (levels by Portland General Electric Co.). Apr. 23, 1909 to Jan. 4, 1914, nonrecording gage at about same site and datum. Nov. 1, 1921 to Dec. 27, 1924, water-stage recorder at present site at datum 0.91 ft higher.
REMARKS - Regulation since May 1956 by Timothy Lake (active capacity, 64,450 acre-ft) and by Oak Grove powerhouse.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 68,200 ft³/s Dec. 22, 1964, gage height, 21.7 ft, from floodmark, from rating curve extended above 34,100 ft³/s on basis of slope-area measurement of peak flow at gage height 15.06 ft; minimum discharge recorded, 260 ft³/s Oct. 15, 2001.