Overview
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 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.