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Station operated in cooperation with Portland General Electric.
STATION.--14209000 OAK GROVE FORK ABOVE POWERPLANT INTAKE, OR
LOCATION.--Lat 45° 04'17", long 121° 56'22", SW 1/4 SE 1/4 sec 3, T.6 S., R.7 E.,
Clackamas County, 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.
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. 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, Dec. 1923 to Sept. 1996, at site
0.6 mi downstream at different datum.
REMARKS.--Flow regulated since 1956 by Timothy Lake (station 14208600). Low
flows are affected at times by diversion to Stone Creek Hydroelectric Project. Unit
value discharges may not be representative of instantaneous flow conditions, however,
daily discharge values
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,
148 ft3/s Sept. 3, 2001.
NOTE: The most current shifted rating for this site can be found at USGS Rating Depot website.
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