Deer Creek State Park
From TrailGuide
Deer Creek State Park is southwest of Columbus, near Mount Sterling. The park site says there is a 1 mile easy mountain bike trail.
The link to the park page:
http://ohiodnr.com/parks/deercrk/tabid/725/Default.aspx
The link to the park map:
http://www.dnr.state.oh.us/Portals/2/parkmaps/deercreekparkmap.pdf
It looks like the mtb trail is on the south end of the lake, off of Crownover Mill Road.

