USGS Water-Year Summary 2020
05428000 LAKE MENDOTA AT MADISON, WI
LOCATION - Lat 43°05'42", long 89°22'12" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.12, T.7 N., R.9 E., Dane County, WI, Hydrologic Unit 07090001, in county boat house at dam at outlet, in Madison.
DRAINAGE AREA - 233 mi² of which 36.6 mi² probably is noncontributing. Area of Lake Mendota, 15.2 mi².
- WDR WI-73-1: Drainage area.
PERIOD OF RECORD - January 1916 to January 1985 (incomplete), February 1985 to current year.
GAGE - Water-stage recorder. Datum of gage is 840.00 ft above NGVD of 1929, or 5.60 ft below City of Madison datum. Prior to Oct. 1, 1979, at datum 7.82 ft higher; prior to Nov. 15, 1971, nonrecording gage at same site at the higher datum.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height observed, 12.75 ft, June 5, 2000; minimum observed, 8.09 ft, Feb. 2, 2001, current datum.