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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
14206694 TUALATIN RIVER AT RIVER MILE 24.5, NR SCHOLLS, OR
LOCATION - Lat 45°24'06", long 122°53'38" referenced to North American Datum of 1927, Washington County, OR, Hydrologic Unit 17090010, on left bank.
DRAINAGE AREA - 618 mi²
WATER-QUALITY RECORDS
PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: May 1997 to current year (seasonal records only).
pH: May 1997 to current year (seasonal records only).
WATER TEMPERATURE: May 1997 to current year (seasonal records only).
DISSOLVED OXYGEN: May 1997 to current year (seasonal records only).
INSTRUMENTATION - Water-quality monitor.
REMARKS - Additional parameters are collected at this location but are not referenced in this document, data available via NWISWeb.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum, 485 microsiemens Sept. 8, 2019; minimum, 45 microsiemens Dec. 9, 2007.
pH: Maximum, 8.0 units July 26, 2008; minimum, 6.4 units Dec. 18, 2002, Aug. 24, 20014, Nov. 24-28, 2012.
WATER TEMPERATURE: Maximum, 26.6°C June 28, 2021; minimum, 3.7°C Nov. 30, 2015.
DISSOLVED OXYGEN: Maximum, 13.3 mg/L July 26, 2008; minimum, 4.5 mg/L Aug. 10, 2003.
