05/28/2026
Last month, Lake County experienced flooding along the Des Plaines and Fox Rivers. Thanks to a rainy April, the county averaged over eight inches of rain, with the northwest section of the county reaching over 10 inches. This, on top of the 9 to 12 inches of rain received in parts of southern Wisconsin, led to Lake County reaching Major Flood status.
On April 15, the Lake County Stormwater Management Commission's (SMC) Flood Threat Alert level changed to Orange status, which means flooding is extremely likely or moderate flooding is occurring. Field Teams were deployed and spent 18 days out in the field. When SMC reached Red status, or Major Flood, there were up to four field teams deployed at once.
The drone team visited 30 different sites and ran 42 drone flights. They recorded over 24 hours of footage in a five-day period. The Des Plaines River team visited over 10 flood problem areas to observe and record peak flood levels and impacts. The Des Plaines River crested on April 19 in the Gurnee area and April 20 in the Lincolnshire area.
The Upper Fox River and Chain O’Lakes team installed 15 stakes to monitor flood levels and capture the crest on April 22. The Lower Fox River team surveyed highwater marks 19 times at nine different locations, creating over 170 readings. This area crested on April 23.
To keep residents informed, SMC shared flooding updates from April 15 to May 1, including over 20 Facebook posts, 12 emails to partner organizations, and added a Flood Response webpage with helpful flooding resource links. Chief Engineer Brian Frank gave three interviews to media outlets to inform greater Chicagoland about flooding in our county.
SMC staff also coordinated with partners, including outside organizations and the Lake County Emergency Management Agency (EMA) and Division of Transportation (DOT), to manage the response to flooding and prepare for a potential emergency. SMC’s Flood Threat Alert was canceled on May 5.
We’re proud of the work our team did and how we assisted our residents when needed!