Tunnel (Greentree Rd.) across Greentree Rd. SW of Heidelberg, Scott Township, Allegheny County, PA. PA50 (Washington Pike) N. 1.1 miles from jct with I79 exit 55 S. of Heidlebert, E. on Greentree Rd. 0.2 miles to the tunnel. (7-31-06, N40 23.17 W80 05.28) Photo by Jack Schmidt.