Interstate 376 originally ran along just the Penn-Lincoln Parkway East through Pittsburgh to the eastern suburbs of Edgewood, Forest Hills and Churchill. The freeway follows the Monongahela River initially, then turns away from the river via the Squirrel Hill Tunnel. Often referred to as the Parkway East, the parkway predated the Interstate system as U.S. 2230 to connect Pittsburgh with the Pennsylvania Turnpike mainline at Monroeville.