USGS Water-Year Summary 2024
14211010 CLACKAMAS RIVER NEAR OREGON CITY, OR
LOCATION - Lat 45°22'46", long 122°34'34" referenced to North American Datum of 1927, in SW 1/4 sec.21, T.2 S., R.2 E., Clackamas County, OR, 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.
REVISIONS HISTORY - WDR OR 2005-1: 2002(M), 2003(M), 2004(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 2001 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (Oregon Department of Transportation bench mark).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 67,700 ft³/s Jan. 2, 2009, gage height, 45.51 ft; minimum discharge, 518 ft³/s Sept. 6, 2003.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: June 2002 to current year.
pH: June 2002 to current year.
WATER TEMPERATURE: June 2002 to current year.
DISSOLVED OXYGEN: June 2002 to current year.
TURBIDITY: June 2002 to current year.
INSTRUMENTATION - Water-quality monitor. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 83 microsiemens Oct. 25, 2005; minimum, 26 microsiemens Jan. 16, 17, 2011.
pH: Maximum, 9.5 units Mar. 27, 31, 2006, but may have been higher during period of missing record; minimum, 6.3 units Dec. 14, 15, 2003.
WATER TEMPERATURE: Maximum, 25.4°C June 28, 2021; minimum, 0.0°C Dec. 10, 11, 2009, Dec. 9, 2013.
DISSOLVED OXYGEN: Maximum, 15.7 mg/L Feb. 23, 26, 2008, but may have been higher during period of missing record; minimum, 5.4 mg/L July 18, 2004.
TURBIDITY: Maximum, 744 FNU Jan. 2, 2009; minimum, <1 FNU on many days each year.