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

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USGS Water-Year Summary 2020

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. Elevation of gage is 490 ft above NGVD of 1929, from topographic map.

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.

Water Year 2014: Records good, except for estimated daily discharges, which are fair. An average discharge of about 111 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

Water Year 2015: Records good, except for estimated daily discharges, which are fair. An average discharge of about 123 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

Water Years 2016, 2017: No estimated daily discharges. Records good. An average discharge of about 121 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

Water Year 2018: Records good. An average discharge of about 120 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

Water Year 2019: Records good. An average discharge of about 129 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

Water Year 2020: Records good. An average discharge of about 117 ft³/s was diverted during the year by Seattle City Water diversion 1.5 mi upstream from the gage.

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 -

Water Year 2014: WATER TEMPERATURE records are excellent. No record Nov. 7-9, Jun. 7-12.

Water Year 2015: WATER TEMPERATURE records are excellent. No record Nov. 30 to Dec. 1, Feb. 27 to Mar. 2.

Water Year 2016: WATER TEMPERATURE records are excellent except Sept. 6-14 which are poor.

Water Year 2017, 2018: WATER TEMPERATURE records are excellent.

Water Year 2019: WATER TEMPERATURE records are good.

Water Year 2020: WATER TEMPERATURE records are ________.

EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 18.8°C, June 30, 2015; minimum, 2.9°C, Jan. 7, 2004.