USGS Water-Year Summary for Site 12113390

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00065 Gage height(Max.,Min.)
	63680 Turbidity, Form Neph(Max.,Med.,Min.)
	72137 Discharge,tide fltrd(Mean)

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

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USGS Water-Year Summary 2023

12113390 DUWAMISH RIVER AT GOLF COURSE, AT TUKWILA, WA

LOCATION - Lat 47°28'44.35", long 122°15'31.44" referenced to North American Datum of 1983, in NE 1/4 SW 1/4 sec.14, T.23 N., R.4 E., King County, WA, Hydrologic Unit 17110013, on left bank at footbridge, 0.5 mi downstream from Black River confluence, at Tukwila, 10.4 mi upstream from mouth.

DRAINAGE AREA - 461 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - November 2013 to current year.

GAGE - Water stage recorder, crest stage gage, and velocity recorder. Datum of gage is NAVD 1988.

REMARKS -

Since Dec. 5, 1961, flow regulated by Howard A. Hanson Reservoir (station 12105800), 54.1 mi upstream from station, for flood control and, during summer months, to augment the natural river flow. Minor diversions on upstream tributaries for domestic use. River flow at this station is affected significantly by astronomical tides. By convention, the U.S. Geological Survey has established ebb (seaward) flows as positive flows and flood (landward) flows as negative flows. Daily mean discharge was computed using the Godin low-pass filter to remove tidal effects from instantaneous values. U.S. Geological Survey satellite telemeter at station.

City of Tacoma diverted the following average daily discharges from river at headworks near Palmer, 50.6 mi upstream from station, for municipal use:

Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)
2014	59.4	2015	69.7	2016	90.2	2017	95.6
2018	90.3	2019	96.5	2020	92.4	2021	95.0
2022	96.0	2023	95.8

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,100 ft³/s, Dec. 9, 2015, elevation, 19.16 ft; maximum elevation, 19.41 ft, Feb. 9, 2020 (tidal influence); minimum discharge, -1,390 ft³/s, Aug. 3, 2015; minimum elevation, 3.37 ft, July 18 and 20, 2023.

WATER-QUALITY RECORDS

PERIOD OF RECORD - March 1996 to September 2004 (discontinued).

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: March 1996 to September 1999. WATER TEMPERATURE: March 1996 to September 1999. November 2013 to current year. TURBIDITY: November 2013 to March 2020.

INSTRUMENTATION - Temperature probe interfaced with a Data Collection Platform/Electronic Datalogger, with 15-minute logging interval, since November 2013. 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 2020. Prior ratings can be obtained via request to the Washington Water Science Center.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 386 microsiemens, Sept 8. 1999, but may have been higher during periods of missing record; minimum, 34 microsiemens, Jan. 2, 1999, but may have been lower during periods of missing record. WATER TEMPERATURE: Maximum, 25.0°C, July 3, 2015; minimum, 0.2°C, Dec. 8, 2013. TURBIDITY: Maximum, 520 FNU, Jan. 8, 2015; minimum daily turbidity, 0.4 FNU, Aug. 21, 22, 2018.