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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.
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USGS Water-Year Summary 2024
12118500 ROCK CREEK NEAR MAPLE VALLEY, WA
LOCATION - Lat 47°22'48", long 122°00'58" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.22, T.22 N., R.6 E., King County, WA, Hydrologic Unit 17110012, on right bank 20 ft below box culvert exit, 2 mi southeast of Maple Valley, and 650 ft upstream from mouth.
DRAINAGE AREA - 12.6 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1945 to September 1973, May 2001 to September 2021.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 400.00 ft above NAVD of 1988 (Levels from City of Kent). Prior to March 16, 1953, recording gage at site 50 ft upstream at datum 13.10 ft higher. March 16, 1953, to September 30, 1973, recording gage at site 100 ft upstream at datum 13.951 ft higher.
REMARKS - Diversions by City of Kent upstream of gage for municipal use may effect flow. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 267 ft³/s, Feb. 7, 2020, gage height, 23.19 ft; minimum, 0.29 ft³/s, Sept. 27, 1973.
