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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
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 |
Water Year |
Discharge |
Water Year |
Discharge |
Water Year |
Discharge |
|
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.
