USGS Water-Year Summary 2019
14237800 MAYFIELD RESERVOIR NEAR SILVER CREEK, WA
LOCATION - Lat 46°30'13", long 122°35'11" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.20, T.12 N., R.2 E., Lewis County, WA, Hydrologic Unit 17080005, on right bank at Mayfield Dam on Cowlitz River, 0.3 mi downstream from Silver Creek, 4 mi south of the community of Silver Creek, and at mile 52.0.
DRAINAGE AREA - 1,392 mi².
PERIOD OF RECORD - April 1962 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929. Prior to Mar. 5, 1963, nonrecording gage at same site and datum.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 134,850 acre-ft, Dec. 9, 1971, elevation, 425.50 ft; minimum contents since normal operating level was attained, 112,830 acre-ft, June 4, 1969, elevation, 415.24 ft.