Preserve history
The 292-acre Theodore Marsh was acquired between 1994 and 2009.
The preserve is part of the Rock Run preservation system, which conserves more than 1,450 acres.
A 140-acre portion of the site was registered as an Illinois Land and Water Reserve in 2003. This registration provides permanent protection for the preserve's natural resources.
PLAN YOUR ADVENTURE ON THIS PRESERVE'S INTERACTIVE MAP
Natural resources
Theodore Marsh protects a diversity of habitats, including forest, prairie, wetland and a portion of Rock Run.
Wildlife found at the preserve includes more than 100 bird species, such as the pie-billed grebe.
The preserve is also home to a variety of plant species, including velvety white vervain, smooth blue aster and marsh bellflower.
The site is managed with invasive species control, prescribed burning and habitat restoration to protect and enhance its natural resources.
The preserve's restoration began in 2000 with the removal of fill that had been dumped into the wetlands and the creation of upland prairie and wetland on more than 120 acres.
Amenities and activities
Trails
Theodore Marsh provides access to the 11.29-mile, paved Rock Run Greenway Trail, ideal for the following activities:
- Biking
- Hiking/running
- In-line skating
- Cross-country skiing
- Snowshoeing
The preserve also provides access to the 4.36-mile, paved Joliet Junction Trail, ideal for the following activities:
- Biking
- Hiking/running
- In-line skating
- Cross-country skiing
- Snowshoeing
The Rock Run Greenway Trail and Joliet Junction Trail connect to the Illinois Department of Natural Resources’ crushed limestone I&M Canal State Trail to provide a 16-mile, mostly paved loop trail.
Picnicking
The preserve offers one picnic shelter for rental, Gaylord Road Access Shelter, which has a perrmit capacity of 60 people.
Playground
The preserve features a playground.
Geocaching
Permits are available for geocaching at this preserve.
