Lake levels for Mendota, Monona, Waubesa, and Kegonsa are charted in the graph below. The levels are expressed in feet above sea level over a specified duration of time. Note that levels are provisional data from USGS which are subject to revision based on a thorough review to ensure accuracy. Final data are usually published within 6 months of the end of the water year (Sept 30). Choose a new duration from the drop down list to view the lake levels for that period of time. You can also choose the lakes that you would like to see by selecting the check box next to the lake name. If you select a single lake, the target levels for summer maximum, summer minimum and winter minimum are displayed along with actual lake levels.