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Water-Year Summary for Site 12113415

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  • 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.
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  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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Available Parameters
00010 Temperature, water(Max.,Min.)  
00065 Gage height(Max.,Min.)  
00480 Salinity(Max.,Min.)  
63680 Turbidity, Form Neph(Max.,Min.)  

Water year 2019: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2019
12113415 DUWAMISH RIVER AT EAST MARGINAL WAY BRIDGE AT DUWAMISH, WA
LOCATION - Lat 47°30'01.82", long 122°17'17.31" referenced to North American Datum of 1983, in sec.10, T.23 N., R.4 E., King County, WA, Hydrologic Unit 17110013, on right bank at bridge, 6.8 mi upstream from mouth.
DRAINAGE AREA - 483 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 2015 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is North American Vertical Datum of 1988 (NAVD 88).
REMARKS - Gage height record only. Large diurnal fluctuation because of tides. Flow regulated by Howard A. Hanson Reservoir (station 12105800) for flood control and during summer months to augment the natural river flow. Minor diversions and regulation on upstream tributaries. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum recorded gage height, 12.29 ft, March 10, 2016; minimum recorded gage height, -0.99 ft, Sept. 6, 2018.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: July 2015 to current year. TURBIDITY: July 2015 to November 2017. SALINITY: July 2015 to current year.
INSTRUMENTATION - Turbidity sensor (FTS DTS-12) from July 2015 to November 2017, and multiparameter water quality sonde interfaced with a Data Collection Platform/Electronic Datalogger, with 15-min recording interval, since July 2015. 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 - Additional details are available from the Western Washington Field Office. Daily maximum and minimum statistics should be interpreted differently at estuarine sites than at freshwater sites due to multiple coastal influences, including an off-set tidal cycle superimposed over a daily cycle.
  • Water Year 2015: WATER TEMPERATURE records are good. TURBIDITY records are excellent except July 14-16, which are good, July 17-29, which are fair, and July 30-Sept. 30, which are poor. SALINITY records are good except Sept. 4-30, which are fair.
  • Water Year 2016: WATER TEMPERATURE records are excellent except Oct. 1 to Jan. 8, which are good, Jan. 9 to May 5, which are fair, and May 6 to June 29, which are poor. TURBIDITY records are excellent except Jan. 14 to Apr. 26, June 30 to Sept. 30, which are good, Apr. 27 to May 12, which are fair, and Oct. 1-13, May 13 to June 29, which are poor. SALINITY records are good except Oct. 1-13, July 8-11, which are fair, July 12-25, which are poor.
  • Water Year 2017: WATER TEMPERATURE records are excellent. TURBIDITY records are good except Mar. 28 to Apr. 18, which are fair and Apr. 19-24, which are poor. SALINITY records are good except Oct. 14, Feb. 1-15, which are fair and Oct. 15-24, Feb. 16 to Mar. 14, which are poor.
  • Water Year 2018: WATER TEMPERATURE records are excellent. TURBIDITY records are good. SALINITY records are good except Apr. 1 to May 17, 2018, which are fair and May 18, 2018 to May 10, 2019, which are poor.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 23.4°C, July 19, Aug. 1, 2015, and July 30, 2018; minimum, 0.8°C, Jan. 5, 2017. TURBIDITY: Maximum, 410 FNU, Sept. 29, 2016; minimum, 0.0 FNU, several days May to June, 2016. SALINITY: Maximum recorded, 25.5 ppt, July 27, 2015 and Aug. 4, 2018; minimum, 0.0 ppt, many days Oct. to June, most water years.