Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins
  • Please see news on new formats
  • UPDATE, 11/9: As of November 8, the USGS has successfully restored all of the operational gages that stopped transmitting due to an issue with the satellite telemetry system that records and transmits data. The USGS will now focus on restoring other equipment that experienced the telemetry issues, including about 85 rapid deployment gages that are used periodically for emergency response. Read more
  • Full News RSS icon

Water-Year Summary for Site USGS 14211720

Click to hide Water-Year Summary instructions and information
  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
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.)  
62361 Chlorophyll, in situ(Max.,Mean,Min.)  
63680 Turbidity, Form Neph(Max.,Med.,Min.)  
72137 Discharge,tide fltrd(Mean)  

Water year 2015: 2014-10-01 to 2015-09-30
 

Print this page
USGS Water-Year Summary 2015
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.
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 Unpublished records for period October 1994 to September 2002 are available via NWISWeb.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 1.55 ft above NGVD of 1929 (levels by National Weather Service).
REMARKS - Records below 20,000 ft³/s and estimated daily discharges are poor. 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; minimum 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.
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 water years 2013-15.
Water-Data Report 2015
14211720 WILLAMETTE RIVER AT PORTLAND, OR -- Continued

YEAR 2014-10-01 to 2015-09-30
DAILY VALUES
Day
USGS Water-data graph for site USGS 14211720