The Cheat Narrows provides many relatively easy access places to swim along Rt. 72. The river is narrow (hence the name) and deep in spots, so jumping off rocks is possible. Just pull off the road at a turnout and look for a fun spot to jump in. This is a popular place for fishing as well as whitewater boating.
This section of river is near Kingwood, along Rt. 72 toward Rowlesburg (Google directions below). Park along the road beginning at Pringle Run bridge for the next five miles along Rt. 72 toward Rowlesburg.