USGS Water-Year Summary for Site 14211010

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Mean,Min.)
	00300 Dissolved oxygen(Min.,Mean,Max.)
	00400 pH(Med.,Max.,Min.)
	63680 Turbidity, Form Neph(Med.,Max.,Min.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

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).

REMARKS - Diurnal fluctuation and regulation caused by powerplants at River Mill Dam and North Fork Dam. Minor regulation by Timothy Lake (active capacity, 64,450 acre-ft). Small diversion upstream from station.

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.

REMARKS - TURBIDITY: Data collected using a YSI EXO turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 2 percent or 0.3 Formazin Nephelometric Units (FNU). Prior to June 21, 2016, data was collected using a YSI 6136 turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 2 percent or 0.3 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Additional parameters collected at this location are available via NWISWeb.

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.