USGS Water-Year Summary 2024
12470000 SOAP LAKE NEAR SOAP LAKE, WA
LOCATION - Lat 47°24'11", long 119°29'11" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.18, T.22 N., R.27 E., Grant County, WA, Hydrologic Unit 17020014, on east shore 0.9 mi north of town of Soap Lake.
DRAINAGE AREA - 413 mi². of which 281 mi² in the vicinity of Banks Lake is noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May to August 1936, March 1938 to February 1957 (fragmentary), March 1957 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929, adjustment of 1937 (Bureau of Reclamation datum) and 2.64 ft above NAVD of 1988 (USGS GNSS Level II survey Oct. 15, 2021). Prior to Feb. 4, 1953, nonrecording gage at site 0.2 mi uplake. Feb. 4, 1953, to June 8, 1954, nonrecording gage at site 1.5 mi uplake and June 9, 1954, to June 21, 1957, water-stage recorder at site 0.2 mi uplake.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum elevation known, 1,083.1 ft, from well-defined alkali line at gage, date unknown.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation observed, 1,079.20 ft, Jan. 28, 1953: minimum elevation, 1,069.11 ft, Sept. 29, 2024.