LOCATION.--Lat 41°42'13", long 93°41'21"
referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.30,
T.80 N., R.24 W., Polk County, IA, Hydrologic Unit 07100004, in
control tower of Saylorville Dam on the Des Moines River, 3.2 mi
northwest of Saylorville, 4.4 mi upstream from Beaver Creek, and
205.3 mi upstream from mouth. (map)
DRAINAGE AREA.--5,823 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--April 1977 to current year.
GAGE.--Water-stage recorder. Datum of gage is 0.00 ft above
National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps
of Engineers).
COOPERATION.--Records provided by U.S. Army Corps of
Engineers.
REMARKS.--Reservoir is formed by earthfill dam completed in 1976.
Storage began in April 1977. Release controlled at intake structure
to forechamber of 22-ft diameter concrete conduit through dam.
Ungated chute spillway 430 ft in length at right end of dam at
elevation 884 ft, contents 570,000 acre-ft. Conservation pool at
elevation 836 ft, contents 90,000 acre-ft, surface area 5,950 acres.
Flood pool elevation at 890 ft, contents 586,000 acre-ft, surface
area 16,700 acres. Reservoir is used for flood control, low-flow
augmentation, conservation and recreation. Storage tables for water
years 1985-1986 published as day second-ft instead of acre-ft
storage. Prior to October 1, 2000, published as contents in acre-ft,
and as elevation in ft thereafter.