LOCATION.--Lat 41°32'02", long 93°56'59" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 SW 1/4 sec.22, T.78 N., R.27 W., Dallas County, IA, Hydrologic Unit 07100006, on right bank 160 ft downstream from bridge on County Highway R16, 0.3 mi northeast of Van Meter, 0.7 mi upstream from small left bank tributary, 1.2 mi downstream from confluence of North and South Raccoon Rivers, and 29.3 mi upstream from mouth. (map)

DRAINAGE AREA.--3,441 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from April 1915 to current year. Prior to October 1933, monthly mean discharge for some periods published in WSP 1308.

REVISED RECORDS.--WSP 1308: 1927 (M). WSP 1438: Drainage area. WSP 1508: 1915 (M), 1925 (M), 1926, 1933 (M), 1939 (M), 1947 (M), 1949 (M).

GAGE.--Water-stage recorder. Datum of gage is 841.16 ft above National Geodetic Vertical Datum of 1929. Prior to October 1, 1915, non-recording gage at same site at datum 2.00 ft higher. October 1, 1915, to May 30, 1923, non-recording gage, May 31, 1923, to September 30, 1927, water-stage recorder, and October 1, 1927, to August 8, 1934, non-recording gage, all at same site and datum.

WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1974-1979, 1987-1994.

PERIOD OF DAILY RECORD.--
NITRATE + NITRITE: March to September 2012.
WATER TEMPERATURE: March to September 2012.

Advanced Hydrologic Prediction Service

National Streamflow Information Program

Agriculture's Clean Water Alliance

Des Moines Water Works