The name 'Midewin' comes from the Potawatomi language, referencing the Grand Medicine Society.
Bison were reintroduced to Midewin as a 20-year experiment to study their impact on prairie restoration.
The prairie is situated on land that served as the Joliet Army Ammunition Plant during World War II.
Over 400 prehistoric and historic archaeological sites have been identified within the prairie boundaries.
The site hosts unique dolomite prairie ecosystems that occur where limestone bedrock is close to the surface.
Some restored areas now feature native grasses like big bluestem that can reach heights of up to eight feet.
Midewin National Tallgrass Prairie is the largest protected tallgrass prairie east of the Mississippi River, spanning approximately 18,500 acres. Established in 1996, the site serves as a massive restoration project transforming a former U.S. Army ammunition plant into a native ecosystem. The landscape is characterized by restored prairie grasses, wetlands, and dolomite prairies that support hundreds of plant and animal species. A prominent feature is the managed bison herd, reintroduced in 2015 to act as an ecological tool for stimulating biodiversity. The area features over 30 miles of trails for hiking, biking, and horseback riding. Several bunkers, known as igloos, remain visible throughout the property as remnants of its military history.
The Iron Bridge Trailhead, which offers elevated views of the prairie landscape and surrounding bunkers.
Bring binoculars for spotting the bison herd, as they often graze far from the main trails.
Check the official website for 'bison grazing area' closures, as portions of the trails close to protect the herd and visitors.
Download trail maps offline before arrival, as mobile service is unreliable across the large expanse.
Do not attempt to approach or feed the bison; they are wild animals and can be dangerous.
The bison pasture area may be closed to public access during certain times of the year for herd management.
Stay on marked trails to avoid tick exposure and protect fragile restoration plots; keep pets leashed at all times.
