A critical segment of this 320-mile route through highlands and river valleys is the Great Allegheny Passage, extending 150 miles from Duquesne, Pa., to Cumberland, Md. As the City of Pittsburgh neared the celebration of its 250th anniversary in 2008, leaders in Allegheny County set a goal of helping celebrate the event by completing the passage, building a connection between McKeesport, on the south side of the Monongahela River, and Duquesne on the opposite shore.
Owned by U.S. Steel Corporation, the 118-year-old bridge was carrying heavy Union Railroad train traffic on a regular schedule across the river. Officials had looked at other options in evaluating where to make the connection; but, for example, a proposal to use the sidewalks adjacent to the McKeesport-Duquesne Bridge was determined to be undesirable because the sidewalks were too narrow.
Read about how L.R. Kimball created a critical link in this system in our case study, L.R. Kimball Converts Rail Bridge to Pedestrian Trail, Providing Missing Link in Great Allegheny Passage