Thursday, October 3, 2019 - 6:50pm

City engineers expect Lake Monona to crest today around the 100-year flood elevation following the rain that came Tuesday night into Wednesday morning. Additional rain, forecast for Saturday, is likely to bring Lake Monona water levels at or slightly above the 100-year flood elevation. A significant lowering of Lake Monona water level prior to Saturday’s rain is not likely.

Urban flash flooding is not a concern through Friday evening. However, the forecast will be monitored for Saturday, Oct. 5. The National Weather Service expects 0.25-0.75 inches of rain in Madison on Saturday, Oct. 5. Even sustained moderate rains in the East isthmus could cause flash flooding at the current lake and river levels.

Current Lake levels: Oct. 3, 2019

Lake Mendota Current elevation: 851.82 feet Up 0.37 feet from Oct. 2, 2019, up 0.84 feet since Oct. 1, 2019 0.98 feet below the 100-year flood (which is 852.80 feet) 0.92 feet below historic high (Historic High is 852.74, June 6, 2000)

Lake Monona Current elevation: 847.65 feet Up 0.15 feet from Oct. 2, 2019, up 0.67 since Oct. 1, 2019 0.05 feet below 100-year flood (which is 847.7 feet) 0.88 feet below the historic high (which is 848.53 feet, Sept. 6, 2018)



Before Saturday

Residents or businesses located in the low-lying areas of the east isthmus and near east side should prepare their property for potential flash flooding. One option would be to fill sandbags at one of the City’s sandbag locations:



Engineering Service Building, 1600 Emil St.

Olbrich Park Secondary Boat Launch Parking Lot, 3402 Atwood Ave.

Olin Park Parking Lot, 1156 Olin-Turville Court

Spring Harbor Park Parking Lot, 5417 Lake Mendota Dr.

Tenney Park Beach Parking Lot, 1254 Sherman Ave.

Thut Park, 2630 Nana Way

Warner Park Beach Parking Lot, 1101 Woodward Dr.

Residents should bring their own shovel to load sand bags. Visit the City’s flooding website for sandbag information and how to fill and place sandbags properly.

Barricades remain at most low-lying intersections most prone to urban flash flooding again in case they are needed on Saturday. However, all roads and major paths are currently open.

Other reminders