(Hidden Creek Campground, 30', 1986, 38-60-F #3) across Black Run in Hidden Creek Campground N. of Allenwood, Gregg Township, Union County, PA. US15 N. 2.2 miles from jct with PA44 in Allenwood to the campground & bridge on the E. side of the road. (5-21-06, N41° 08.29', W76° 54.68') Photos by Jack Schmidt.