USGS Water-Year Summary 2018
06922440 HARRY S. TRUMAN RESERVOIR AT WARSAW, MO
LOCATION - Lat 38°15'23.8", long 93°23'42.8" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 sec.7, T.40 N., R.22 W., Benton County, MO, Hydrologic Unit 10290109, in control room near middle of dam on Osage River, 1.5 mi northwest of Warsaw, and at mile 175.
DRAINAGE AREA - 11,500 mi². with 7,856 mi² uncontrolled area below other reservoirs.
PERIOD OF RECORD - Oct 1981 to current year. Records collected at same site since 1977 available from U.S. Army Corps of Engineers.
GAGE - Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929 (levels by the U.S. Army Corps of Engineers).
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 5,020,000 acre-ft, Oct 11, 12, 1986, elevation, 738.69 ft, Oct 11, 1986; minimum, 41,700 acre-ft, Nov 14, 1978, elevation, 661.0 ft.