USGS Water-Year Summary for Site 12117600

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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

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USGS Water-Year Summary 2023

12117600 CEDAR RIVER BELOW DIVERSION, NEAR LANDSBURG, WA

LOCATION - Lat 47°22'47", long 121°58'56" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.24, T.22 N., R.6 E., King County, WA, Hydrologic Unit 17110012, on right bank 0.8 mi northwest of the Issaquah-Ravensdale road bridge, 0.9 mi northwest of Landsburg, and at mile 20.4.

DRAINAGE AREA - 134 mi².

REVISIONS HISTORY - Prior to WY 2017, drainage area was reported as 124 mi² without 1.9 mi² of Walsh Lake drainage that was diverted past gage. New drainage area includes Walsh Lake drainage and was calculated in StreamStats.

SURFACE-WATER RECORDS

PERIOD OF RECORD - December 1991 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 490 ft above NGVD of 1929 (from topographic map) and is 486.24 ft above NAVD of 1988 (GNSS survey by USGS on June 30, 2022).

REMARKS -

Flow is regulated by Chester Morse Lake (station 12115900) and Cedar Lake (station 12116060) 15 mi upstream for operation of powerplant at Cedar Falls 13.1 mi upstream from station. U.S. Geological Survey satellite telemeter at station.

Seattle City Water diverted the following average daily discharges from the river 1.5 mi upstream from the station, for municipal use:

Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)	Water Year	Discharge (cfs)
2014	111	2015	123	2016	121	2017	121
2018	120	2019	129	2020	117	2021	143
2022	112	2023	136

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 7,790 ft³/s, Jan. 8, 2009, gage height, 11.11 ft; minimum discharge, 45 ft³/s, Sept. 9, 1993.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - WATER TEMPERATURE: May 2001 to current year.

INSTRUMENTATION - Temperature recorder with 15-minute logging interval since May 2001.

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.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 18.8°C, June 30, 2015; minimum, 2.8°C, Dec. 22, 2023.