Flooding

Risk Assessment

We experience no significant additional flood risk due to the current lake levels, but Monona is creeping up.

Lake Mendota Today

Mendota is at 850.81 – this is UP 0.5' FROM last week – summer MAX by WDNR order is 850.10 (so we are approximately 8” over Summer Max). The 100 year elevation is 852.8 but we can only currently effectively rise to approximately 852.0.

Lake Monona Today

Monona is at 846.66 UP 0.5' FROM 846.17 last week – summer MAX by WDNR order is 845.20 (so we are approximately 1.5’ over). The 100 year is 847.7.

The problem low ground elevations in the isthmus area are at about elevation 848.5 to 849.00. These areas drain to Lake Monona and/or the Yahara River downstream of the Tenney Locks. The closer Monona rises to 847.00 the more ineffective our drainage system in these low areas becomes.