Milepost 57 to Milepost 67 Design

Project Overview

This 10 mile Total Reconstruction and Widening Project (Project) of the mainline Pennsylvania Turnpike between Mileposts (MP) 57 to 67 is located in Allegheny and Westmoreland Counties and in the municipalities of Monroeville, Murrysville, Hempfield Township, Penn Township, Manor Borough, Irwin Borough, North Irwin Borough and North Huntingdon Township. The Project will involve widening the Turnpike from two to three lanes in each direction and reconstruction of the Irwin Interchange along with improving the highway to current standards. Within the limits of the Project, two overhead structures (Trafford and Harvison Roads), and numerous structures carrying the mainline Turnpike will be replaced. The Project does not include the Pittsburgh Interchange, Northern Pike or State Route 130. The Project cost estimate is more than $300 million.

Preliminary design for this project began in 2012 and was completed in 2016. Because bridges over the mainline need to be replaced in order to accommodate the wider widths, the replacement of the Trafford Road Bridge over the Turnpike, the Trafford Road Bridge over Lyons Run, and the Lyons Run culvert were advanced as an early action project. The final design began in 2015 and construction was completed in 2019.

A second early action project to repair the slope at Milepost 64.5 was identified and construction is planned to begin in early 2020. This project will include the stabilization of an unnamed tributary to Brush Creek that has undercut a cross pipe and weakened the slope adjacent to the mainline. Repairing the pipe and slope in 2020, will protect the current roadway and allow for the future widening project.

The final design of the mainline widening from Milepost 57 to Milepost 61.5 began in 2016, has been delayed. When the final design phase continues, it will include right-of-way acquisition and environmental permitting along with many design efforts including structures, traffic control, utility relocations, roadway, drainage and stormwater management. The start of construction on the mainline is to be determined.

Corridor Overview

The future widening of the typical roadway section will consist of a six-lane facility (three 12-foot travel lanes eastbound and westbound) with a 26-foot wide median and 12-foot outside shoulders. The project included the construction of storm drainage facilities, stormwater facilities, pavement markings, signing, and the mitigation of impacted wetlands, streams, and other environmental features.

Bridge Overview

To accommodate the widening of the mainline Turnpike, existing bridges will be replaced to provide greater horizontal widths and to improve vertical clearances as may be necessary.

Photos of several of the project's existing bridges are provided below.

  • photo

    New Trafford Road Bridge over Mainline

  • photo

    Harvison Road Bridge (WB-504) over Mainline

  • photo

    Mainline Bridge (WB-464) over Abers Creek Road

  • photo

    Mainline Bridge (WB-465) over Turtle Creek Industrial Railroad

  • photo

    Mainline Bridge (WB-466) over Turtle Creek

  • photo

    Mainline Bridge (WB-509) over Brush Creek

  • photo

    Mainline Bridge (WB-510) over Brush Hill Road

  • photo

    Mainline Bridge (WB-511) over Pennsylvania Avenue

  • photo

    Mainline Bridge (WB-512) over S.R. 0030, Lincoln Highway

Slope Repair Early Action Project

Anticipated to begin in spring 2020 the project will include stabilization of an unnamed tributary to Brush Creek that has undercut a cross pipe and weakened the slope adjacent to the mainline. Repairing the pipe and slope in 2020, will protect the current roadway and allow for a future widening project.

Back
to
Top