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USGS Water-Year Summary 2024
14209000 OAK GROVE FORK ABOVE POWERPLANT INTAKE, OR
LOCATION - Lat 45°04'17", long 121°56'22" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.03, T.6 S., R.7 E., Clackamas County, OR, Hydrologic Unit 17090011, Mount Hood National Forest, on left bank, 0.8 mi upstream from Spring Creek, 1.3 mi upstream from Kink Creek, 1.7 mi upstream from Portland General Electric Co. diversion dam, 24 mi southeast of Estacada and at mile 6.7.
DRAINAGE AREA - 124 mi².
REVISIONS HISTORY - WSP 1248:1909, 1910(M), 1916, 1918, 1923, 1932. WSP 1935: 1914, 1921.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1909 to current year. Monthly discharge only for some periods, published in WSP 1318. Published as both Oak Grove Fork of Clackamas River at proposed intake, near Cazadero and Oak Grove Fork of Clackamas River at intake, near Cazadero, May 1909 to September 1910, as Oak Grove Fork of Clackamas River at intake, near Cazadero, October 1910 to September 1921, and as Oak Grove Fork at Portland General Electric Power Co. intake, October 1921 to September 1929.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 2,100 ft above NGVD of 1929, from topographic map. May 21, 1909 to Nov. 17, 1911, nonrecording gage and Mar. 26, 1912 to Sept. 30, 1923, water-stage recorder, at various sites 0.7 mi downstream, below Kink Creek, at different datum. December 1923 to September 1996, at site 0.6 mi downstream at different datum.
REMARKS - Flow regulated since 1956 by Timothy Lake (active capacity, 64,450 acre-ft). Low flows affected at times by diversion to Stone Creek Hydroelectric Project.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,000 ft³/s Jan. 7, 1923, gage height, 5.45 ft, site and datum then in use, from rating curve extended above 2,300 ft³/s on basis of peak discharge for other stations in Clackamas River basin; minimum discharge, 128 ft³/s Aug. 16, 2004.
