LOCATION.--Lat 43°22'43", long 95°10'52"
referenced to North American Datum of 1927, in NE 1/4 NE 1/4 SW 1/4
sec.23, T.99 N., R.37 W., Dickinson County, IA, Hydrologic Unit
10230003, at pumping station of Lakeside Laboratory on west shore,
2.3 mi upstream from lake outlet, and 3.8 mi northwest of Milford.
(map)
DRAINAGE AREA.--125 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Stage-only records from May 1933 to current
year. Prior to October 1937, published as "Okoboji Lake at
Arnold's Park". October 1937 to September 1966, published as
"Okoboji Lake at Lakeside Laboratory near Milford".
GAGE.--Water-stage recorder. Datum of gage is 1,391.76 ft above
National Geodetic Vertical Datum of 1929 and 94.51 ft above Iowa Lake
Survey datum. Prior to June 17, 1938, non-recording gage at State
Pier at Arnolds Park at same datum.
REMARKS.--Lake formed by concrete dam with ungated spillway at
elevation 1,395.8 ft above National Geodetic Vertical Datum of 1929.
Lake is used for conservation and recreation. Area of lake is
approximately 3,900 acres.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD.--
WATER TEMPERATURE: October 2011 to current year.
Daily data pages will be decommissioned in early 2026.
Daily data are now available in WDFN.
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