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  3. Extreme Weather
  4. Flooding
  5. Aug. – Sept. 2018 Flood Event Maps

Aug. – Sept. 2018 Flood Event Maps

High water levels on Lake Monona and the Yahara River have caused flooding in areas of Madison. These maps show increased flood risks due to the August – September 2018 flood event.

Areas with an Increased Flood Risk due to Lake Monona and Yahara River Water Levels

The information provided on these maps is a best estimate based on available data. Property owners should use these maps as a guideline and use their judgement with regard to decisions regarding protection of their property.

View larger map

Printable Maps

Map of Flooding on the Isthmus
Map of all City of Madison Lake Monona and Yahara River Flooding Areas

Legend

 
Areas that may experience flooding due to rising Lake Monona levels.
 
Areas that may experience flooding due to rising lake levels and flash flooding during rainstorms.
 
Streets that could experience flash flooding during rainstorms.

What to Expect

If you are in the purple flood zone, your property is at risk of flooding quickly during rain:

  • Water may enter the basement through windows
  • Stormwater or sewage may enter the basement through floor drains
  • Your street may become impassible
  • Street flooding may damage your vehicle
  • Water could rise as much as 1 to 2 feet from the curb, depending on rainfall totals

Potential Flood & Flash Flooding Depths

This map shows the estimated potential depth of flash flooding if an intense rain storm were to hit the isthmus while the lake levels are high. The depth is measured from the lowest point in the street. This map is an estimate of depth and is most useful to determine how the risk of flooding varies throughout the flood risk zone.

Map of Potential Flash Flooding Depths Map of Flooding Depths - Brittingham Beach


Some areas adjacent to Lake Monona and the Yahara River will experience flooding. Flooding may also occur in other low-lying areas farther away as the higher river level forces water back through storm sewers. Since much of the drainage system is full of water, it will not take much rain to trigger urban flash flooding.

Learn how to protect your property and prepare for imminent flooding.

Flooding

  • Report Flooding & Damages
  • Flooding Resilience
  • Sandbag Collection
  • How to Prepare for a Flood
  • During a Flood Event
  • Flood Cleanup
  • Understanding Flood Conditions
  • Aug. – Sept. 2018 Flooding Information
  • Dane County Flood Information

Report Flooding & Damages

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Subscribe to the Flooding Updates email list

By participating on this list the Wisconsin Public Records Laws may subject your email address to disclosure to third parties. By selecting "Yes" you are requesting that we treat your email address that you have provided to this list as confidential and you are also stating that you would not participate in this service if the City is obligated to release your email address to such third party requesters.

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