Flooding

Mendota is at 850.49 – this is down from 850.57 last week – summer MAX by WDNR order is 850.10 (so we are approximately 5” over Summer Max). The 100 year elevation is 852.8 but we can only currently effectively rise to approximately 852.0.

Monona is at 845.95 down from 846.02 last week – summer MAX by WDNR order is 845.20 (so we are approximately 9” over). The 100 year is 847.7.

The problem low ground elevations on the isthmus are at about elevation 848.5 to 849.00. The closer Monona rises to 847.00 the more ineffective our drainage system in the isthmus area will become.

Risk Assessment

We experience no significant additional flood risk due to the current lake levels.

The extended forecast looks mostly dry with just scattered rain for the next week.

Recall typically 1” of rain in the Mendota watershed gets you a 3” rise in the elevation of Lake Mendota.