PROVISIONAL DATA SUBJECT TO REVISION

Station operated in cooperation with Clackamas River Water Providers and Water Environment Services.

14211010  CLACKAMAS RIVER NEAR OREGON CITY, OR
LOCATION.--Lat 45° 22'46", long 122° 34'34", in SW 1/4 sec.21, T.2 S., R.2 E., 
Clackamas County, Hydrologic Unit 17090011, on left bank 1,000 ft upstream 
from bridge on Interstate Highway 205, and at mile 1.6.
DRAINAGE AREA.--940 mi2.
PERIOD OF RECORD.--June 2001 to current year.
GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929 (Oregon State 
Highway Bench Mark).
REMARKS.--Diurnal fluctuations and regulation caused by powerplants at River 
Mill Dam and, since 1958, North Fork Dam. Minor regulation since 1956 by Timothy 
Lake (station 14208600). One small diversion for City of Estacada near Estacada.
The North Clackamas County Water Commision intake and South Fork Water Board intake
facilities are located upstream of the gage.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 38,000 ft3/s Feb. 1, 2003, 
gage height, 38.50 ft; minimum discharge, 518 ft3/s Sept. 6, 2003.

NOTE: River forecasts and additional data can be obtained at the 
National Weather Service's Advanced Hydrologic Prediction Services web page.

NOTE: The most current shifted rating for this site can be found at USGS Rating Depot website.