LOCATION.--Lat 41°41'18", long 93°44'07"
referenced to North American Datum of 1927, in SW 1/4 SW 1/4 SW 1/4
sec.35, T.80 N., R.25 W., Polk County, IA, Hydrologic Unit 07100004,
on left bank 10 ft upstream from bridge on Northwest 70th Avenue in
Johnston, 2.5 mi east of Grimes, 0.5 mi downstream from Little Beaver
Creek, and 6.3 mi upstream from mouth. (map)
DRAINAGE AREA.--358 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Discharge records from April 1960 to current
year.
REVISED RECORDS.--WDR IA-77-1: 1974 (P). WDR IA-95-1:
Location.
GAGE.--Water-stage recorder. Datum of gage is 806.98 ft above
National Geodetic Vertical Datum of 1929. Prior to August 31, 1966,
non-recording gage at same site and datum.
WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 2008, 2012.