USGS Water-Year Summary 2019
06821140 SMITHVILLE RESERVOIR NEAR SMITHVILLE, MO
LOCATION - Lat 39°23'50", long 94°33'25" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 NW 1/4 sec.24, T.53 N., R.33 W., Clay County, MO, Hydrologic Unit 10240012, in control tower at outlet works on the Little Platte River, 1.0 mi northeast of Smithville, and 5.0 mi north of Kansas City.
DRAINAGE AREA - 213 mi².
PERIOD OF RECORD - Jul 1981 to current year. Records collected at same site since 1976 are available from the U.S. Army Corps of Engineers.
GAGE - Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 230,000 acre-ft, Jun 08, 2015, maximum elevation 874.80 ft; minimum, 2,360 acre-ft, Jan 13, 1980, elevation, 819.0 ft.