Mingo National Wildlife Refuge
Mingo NWR encompasses 21,592 acres and lies in a basin formed in an ancient abandoned channel of the Mississippi River in southeast Missouri.
Here is the Refuge website. Phone 573-222-3589
Swampwalk Nature trail: described in Wikipedia: ” a one-mile (1.6-km) loop trail through the bottomland hardwood swamp. A self-guided pamphlet of the trail is available at the Boardwalk parking lot. The path is wheelchair accessible.” The refuge’s website does not state that the boardwalk is wheelchair accessible, but says the trail “… meanders 0.8 miles through the bottomland hardwood forest. Observation decks at the Monopoly Overlook, Rockhouse Marsh, and Red Mill Drive, offer outstanding views of the Mingo Basin and its wildlife.” You might want to call ahead to be sure of the accessibility.