USGS Water-Year Summary for Site 12113415

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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.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

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 gage height, 13.28 ft, Dec. 27, 2022; minimum gage height, -1.13 ft, Sept. 16, 2021 and Aug. 13, 2023.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - WATER TEMPERATURE: July 2015 to September 2019. TURBIDITY: July 2015 to November 2017. SALINITY: July 2015 to September 2019.

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, July 2015 to September 2019. 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 Washington Water Science Center. Continuous water quality record is no longer rated, as of water year 2021. Prior ratings can be obtained via request to the Washington Water Science Center. 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.

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, 25.6 ppt, Aug. 24, 2019; minimum, 0.0 ppt, many days Oct. to June, most water years.