Ohio State Nature Preserves Accessible Nature Preserves Call the Ohio Department of Natural Resources 614-265-6565 for more information.
There are 136 State nature Preserves and natural areas in Ohio., “Most…contain small parking lots and a trail system.” “Restrooms, picnic facilities and areas for active recreation are generally not available.” Some are within State Parks and are described under that heading.
Blackhand Gorge Brochure Photographs on this website show a paved path and it is listed as having an ADA trail. This is probably the four mile bike trail, part of which is currently (10/2015) under repair.
Cooperrider-Kent Bog Brochure The 0.5 mile boardwalk leads you through this “living relect from the Ice Age.”