Stone arch bridge (Plum Run) across Plum Run in National Military Park S. of Gettysburg, Cumberland Township, Adams County, PA. Bus.US15 S. 3.1 miles from jct with US30 in Gettysburg, left on Confederate Av. 1.0 miles to the bridge. (7-11-06, N39 47.09 W77 14.68) Photos by Jack Schmidt.