LOCATION.--Lat 43°28'11", long 95°07'25"
referenced to North American Datum of 1927, in NE 1/4 SE 1/4 NW 1/4
sec.20, T.100 N., R.36 W., Dickinson County, IA, Hydrologic Unit
10230003, 2.3 mi upstream from lake outlet, and 2.3 mi northwest of
Orleans. (map)
DRAINAGE AREA.--75.6 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Stage-only records from May 1933 to September
1975 (fragmentary), April 1990 to current year. Prior to October
1949, published as "at Orleans".
GAGE.--Water-stage recorder. Datum of gage is 1,387.25 ft above
National Geodetic Vertical Datum of 1929, 90.00 ft above Iowa Lake
Survey datum, and 14.15 ft below crest of spillway. Prior to July 6,
1950, non-recording gage or water-stage recorder at various sites
near outlet, all at same datum.
REMARKS.--Lake formed by concrete dam with ungated spillway at
elevation 1,401.4 ft above National Geodetic Vertical Datum of 1929.
Dam constructed in 1969. A previous outlet works had been constructed
in 1944. Lake is used for conservation and recreation.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD.--
WATER TEMPERATURE: Daily minimum/maximum, November 1968 to September
1975, records fragmentary. Daily mean, October 2011 to current year,
records fragmentary.
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