LOCATION.--Lat 41°34'40", long 93°36'19"
referenced to North American Datum of 1927, in SW 1/4 SW 1/4 NE 1/4
sec.10, T.78 N., R.24 W., Polk County, IA, Hydrologic Unit 07100008,
on left bank 40 ft downstream from bridge on Southeast 6th Street in
Des Moines, 0.4 mi downstream from Raccoon River and Scott Street
Dam, and 201.0 mi upstream from mouth. (map)
DRAINAGE AREA.--9,879 mi2.
PERIOD OF RECORD.--Discharge records from April 1940 to current
GAGE.--Water-stage recorder. Datum of gage is 762.52 ft above
National Geodetic Vertical Datum of 1929. Prior to October 1, 1951,
water-stage recorder upstream from Scott Street Dam (0.4 mi upstream
from current site) at datum 11.16 ft higher; October 1, 1951, to
September 30, 1953, water-stage recorder at Southeast 14th Street
(0.5 mi downstream from current site) at current datum; October 1,
1953, to September 30, 1959, water-stage recorder upstream from Scott
Street Dam at datum 11.16 ft higher; October 1, 1959, to September
30, 1961, non-recording gage at current site and datum; October 1,
1961, to April 24, 1997, water-stage recorder at Southeast 14th
Street at current datum.
COOPERATION.--Average monthly pumpage from galleries provided by
Des Moines Water Works.
REMARKS.--Des Moines municipal water supply is taken from
infiltration galleries on Raccoon River, 3.5 mi upstream from
station. At times, water is pumped from Raccoon River into recharge
basins or into Des Moines Water Works reservoir, capacity 4,800
acre-ft. Effluent from sewage treatment plant enters the river 2.3 mi
downstream from station. Net effect of diversions not known. Flow
regulated by Saylorville Lake (station 05481630), 12.7 mi upstream,
since April 12, 1977.
PERIOD OF RECORD.--Water years 1945-1947, 2008, 2009-2010,
PERIOD OF DAILY RECORD.--
WATER TEMPERATURE: Daily instantaneous values collected in
conjunction with suspended-sediment samples, October 1944 to
September 1945, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: October 1944 to