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Water-Year Summary for Site 14207200

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00020 Temperature, air(Max.,Min.,Mean)  
00025 Air pressure(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
32315 Relative fChl, water, in situ(Max.,Min.,Mean)  
32316 fChl, water, in situ(Max.,Min.,Mean)  
32321 Relative fPC, water, in situ(Max.,Min.,Mean)  
63680 Turbidity, Form Neph(Max.,Min.,Med.)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
14207200 TUALATIN RIVER AT OSWEGO DAM, NEAR WEST LINN, OR
LOCATION - Lat 45°21'24", long 122°41'02" referenced to North American Datum of 1927, Clackamas County, OR, Hydrologic Unit 17090010, on left bank.
DRAINAGE AREA - 706 mi².  
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD -

AIR TEMPERATURE: April 1993 to current year.

BAROMETRIC PRESSURE: May 1999 to current year.

INSTRUMENTATION - Climatological monitor.
EXTREMES FOR PERIOD OF RECORD -

AIR TEMPERATURE: Maximum, 44.4°C June 28, 2021; minimum, -11.0°C Dec. 18, 2013.

BAROMETRIC PRESSURE: Maximum, 779 mm/Hg Dec. 30, 2014; minimum, 730 mm/Hg Jan. 4, 2008.

WATER-QUALITY RECORDS
PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: May 1991 to current year.

pH: May 1991 to current year.

WATER TEMPERATURE: May 1991 to current year.

DISSOLVED OXYGEN: May 1991 to current year.

TURBIDITY: April 2004 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 EXO2 sonde. Manufacturer's stated accuracy is the greater of +/- 2 percent of reading or 0.3 Formazin Nephelometric Units (FNU) for 0-999 FNU, and +/- 5 percent for 1,000-4,000 FNU. Prior to Oct. 12, 2016, data collected using a YSI 6136 turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 2 percent or 0.3 Formazin Nephelometric Units. 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, 449 microsiemens Oct. 5, 2015; minimum recorded, 55 microsiemens Feb. 28, 1999.

pH: Maximum, 9.6 units June 24, 1992; minimum, 6.3 units Oct. 7, 17-19, 1993, Dec. 3-7, 2001, Mar. 29, 2002.

WATER TEMPERATURE: Maximum, 27.0°C July 22, 1994; minimum, 0.7°C Jan. 15, 1993.

DISSOLVED OXYGEN: Maximum, 21.8 mg/L June 23, 1992; minimum, 3.2 mg/L Nov. 19, 1992.

TURBIDITY: Maximum, 438 FNU Dec. 6, 2007; minimum, <1 FNU on many days each year.