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Water-Year Summary for Site 14211720

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Mean,Min.)  
00400 pH(Max.,Med.,Min.)  
32295 fDOM, water, in situ(Min.,Max.,Mean)  
32315 Relative fChl, water(Max.,Min.,Mean)  
32321 Relative fPC, water,(Max.,Min.,Mean)  
62361 Chlorophyll, in situ(Max.,Mean,Min.)  
63680 Turbidity, Form Neph(Max.,Med.,Min.)  
72137 Discharge,tide fltrd(Mean)  

Water year 2024: 2023-10-01 to 2024-09-30
 
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USGS Water-Year Summary 2024
14211720 WILLAMETTE RIVER AT PORTLAND, OR
LOCATION - Lat 45°31'03", long 122°40'09" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 sec.03, T.1 S., R.1 E., Multnomah County, OR, Hydrologic Unit 17090012, in pier at east end of drawspan, on upstream side of Morrison Bridge, in Portland and at mile 12.8.
DRAINAGE AREA - 11,200 mi². approximately.
REVISIONS HISTORY - Tidally filtered daily discharges for Feb. 15 to Mar. 2, Apr. 2, 2007, and Feb. 9, 10, June 1-4, 7-9, 2010 have been revised and are available via NWISWeb.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1972 to current year. Unpublished records for period October 1994 to September 2002 are available via NWISWeb. Gage height records collected in this vicinity since 1879 are in reports of the National Weather Service.
GAGE - Water-stage recorder and acoustic velocity meter. Datum of gage is 1.48 ft above NGVD of 1929 (levels by National Weather Service).
REMARKS - Flow regulated by many reservoirs upstream. Many diversions for irrigation upstream from station. Flow significantly affected by astronomical tides. Daily mean discharge since water year 2007 are computed from filtered unit value discharge data. The Godin low-pass filter is used to remove tidal variations from unit values.
EXTREMES OUTSIDE PERIOD OF RECORD - Floods of June 7, 1894 and June 1, 1948, reached stages of 33.0 ft and 30.0 ft, respectively, from information by the National Weather Service.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 420,000 ft³/s Feb. 9, 1996; maximum gage height, 27.74 ft Feb. 9, 1996; minimum daily discharge, 4,200 ft³/s July 10, 1978;  maximum positive unfiltered discharge since water year 2007, 211,000 ft^3/s Jan. 21, 2012; maximum negative unfiltered discharge since water year 2007, -83,200 ft³/s Aug. 1 2015.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: December 1975 to September 1981, November 2001 to September 2004, January 2009 to current year.

pH: January 2009 to current year.

WATER TEMPERATURE: November 1975 to September 1981, November 2001 to September 2005, January 2009 to current year.

DISSOLVED OXYGEN: January 2009 to current year.

TURBIDITY: January 2009 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. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Chemical analyses and periodic suspended sediment data collected at this location are available via NWISWeb. An additional parameter collected at this location is not referenced in this document.
EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 144 microsiemens July 27, 2003; minimum, 42 microsiemens Apr. 15, 16, 2002.

pH: Maximum, 8.6 units July 21, 27, 28, 30, 2009, July 24, 30, 31, 2015; minimum, 6.6 units Jan. 21, 2012.

WATER TEMPERATURE: Maximum, 27.5°C July 29, Aug. 7, 8, 1978; minimum, 0.0°C Jan. 3-10, 1979.

DISSOLVED OXYGEN: Maximum, 14.9 mg/L Jan. 1-5, 2011, Jan. 28-30, 2012; minimum, 1.5 mg/L July 31, 2014.

TURBIDITY: Maximum, 172 FNU Jan. 17, 2011; minimum, <1 FNU on many days during most water years.