It's off the end of Mont Chateau Rd. Trail along the river (.25 miles) takes off from Mont Chateau which is the WV Geological Survey building. Formally a WV State Park. As far as I know this is legit public access. Could also access by boat or kayak from the river.
From Exit 10 on I-68, travel north on WV 43 Mon-Fayette Expressway to the first exit. At end of exit turn left on Bowers Lane, then right onto Fairchance Rd/Cheat Rd. Follow down to the river and turn left on Mont Chateau Rd. and follow to end.