The Grass River Natural Area is a park of 1,502 acres (6.08 km2) of wetlands and wildlife habitat purchased since 1969 by the non-profit group Grass River Natural Area, Inc.

There are 1.5 miles (2.4 km) of boardwalk trails, bridges, and observation platforms that provide easy access to river, stream, lake and wetlands.

This rail trail uses converted roadbed built in the late 1800s by the Chicago and West Michigan Railroad, and operated until the 1980s by the Chesapeake and Ohio Railway.

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