It is the only beach ridge shoreline left in Illinois.
The park serves as a critical stopover point for migratory birds along the Mississippi Flyway.
The park contains the state-designated Illinois Beach Nature Preserve, which covers nearly 800 acres.
The Dead River flows through the park and into Lake Michigan, creating a unique aquatic environment for local wildlife.
Some areas of the park contain rare plant species typically found in much colder climates, left behind after the retreat of the last glaciers.
The park was renamed in 2006 to honor Adeline Jay Geo-Karis, the first woman to be elected to both the Illinois House of Representatives and the Illinois Senate.
Adeline Jay Geo-Karis Illinois Beach State Park is the only remaining beach ridge shoreline left in the state of Illinois. The park encompasses over 4,000 acres of dunes, sandy beaches, marshes, forests, and prairies along Lake Michigan. It is divided into two distinct units, North and South, separated by the Commonwealth Edison power plant property. The landscape supports more than 650 species of plants, many of which are rare or endangered in the state. Birdwatchers frequently visit to observe migratory waterfowl and raptors along the lakeshore flyway. Recreational facilities include a full-service campground, extensive hiking trails, and designated swimming areas. The park features diverse ecosystems ranging from oak forests to interdunal wetlands. Coastal erosion remains a significant geological factor influencing the park's shifting shoreline topography.
The elevated boardwalks overlooking the marshes during golden hour.
Bring insect repellent as the wetlands and marshes support high mosquito populations in summer.
Check the official Illinois Department of Natural Resources website for current beach water quality advisories before swimming.
Explore the North Unit for a quieter, more secluded hiking experience compared to the South Unit.
Do not attempt to swim in areas marked as restricted, as the park experiences dangerous rip currents during high-wind events.
The campground is seasonal and typically operates from spring through late autumn; check for winter closures of park facilities.
Stay on marked trails to protect sensitive dune vegetation; pack out all trash to maintain the ecological integrity of the preserve.
