Milepost 49 to Milepost 53 Design

Project Overview

Bridge WB-451 Leechburg Road Viaduct photo

This project section is 3.5 miles in length and includes widening the existing turnpike mainline to accommodate six 12’ lanes with 12’ on the inside and outside shoulders. Also included in this section’s design are overhead and mainline structure (such as bridges and overpasses) replacements. The estimated construction cost is $92 million. The section begins approximately one mile east of the Allegheny Valley Interchange and traverses portions of the Borough of Oakmont , Plum Borough, and the municipalities of Monroeville in Allegheny County. The project begins near the Hulton Road over the turnpike in front of the Oakmont Country Club and ends in the vicinity of Plum Aqua Club and Saltsburg Road.

Improvements to substandard mainline curves and bridge overhead vertical clearances and roadway widths will be included. All bridges will be replaced and many of these replacements will be completed during the earliest construction phases of the project.

Corridor Overview
This project is one of three sections within 18 miles of continuous expansion that includes mainline reconstruction and widening, geometry improvements and overhead/mainline bridge replacements. The mainline reconstruction and widening plan is to widen all east- and west-bound travel lanes from two to three in each direction. The limits of this corridor are from Milepost 49 at Oakmont Country Club to Milepost 67 at Irwin Interchange. Below is a graphic showing the roadway configuration before and after widening.

Corridor Overview Map Milepost 49 to 67 and Typical Sections

June 25, 2021:

Work to begin on Hulton Road in Plum Borough, Allegheny County June 28

Traffic restrictions and road closure needed for turnpike bridge work.

The Pennsylvania Turnpike Commission is alerting motorists that traffic restrictions will begin on Hulton Road (State Route 2058) in Plum Borough, Allegheny County June 28 for turnpike bridge work.

From June 28 through July 2 flaggers will be in stationed on Hulton Road between Eastern Avenue and Frankland Avenue. They will be alternating single-lane traffic in each direction weekdays between 9 a.m. and 3 p.m. while crews prepare the roadway for construction.

From July 7 through August 13, a portion of Hulton Road (under PA Turnpike) will be closed between Eastern Avenue and Haskell Lane for crews to upgrade the drainage and make other roadway improvements. A 12-mile, suggested detour will be posted directing traffic to:

Allegheny River Blvd. to
Coal Hollow Road to
Frankstown Road to
Leechburg Road to
Unity Road and back onto Hulton Road.

The construction on Hulton Road, which runs under the turnpike at milepost 49.53, is an early-action project for the future total reconstruction between mileposts 49 to 53.

March 26, 2021:

PA Turnpike closure overnight between Allegheny Valley and Pittsburgh Interchanges

Five-hour closure needed March 28 for bridge removal.

The Pennsylvania Turnpike Commission advises motorists traveling the PA Turnpike of a closure between Allegheny Valley, Exit #48, and Pittsburgh, Exit #57, interchanges starting at 11:59 p.m. on March 27 through 5 a.m. on March 28, weather permitting. 

This five-hour closure is needed so crews can safely remove the original Unity Trestle Road bridge which carried traffic over the Turnpike at milepost 52.36 in Plum Borough, Allegheny County.  The new bridge was constructed beside the existing bridge, traffic was switched to the new structure in Nov. 2020.

Drivers should use the following suggested detour: 

EASTBOUND TRAFFIC Exiting at Allegheny Interchange:

Freeport Road (1 miles) to

State Route 910 west (.5 mile) to

State Route 28 south (12 miles) to

I-579 south Veterans Bridge (.5 mile) to

I-376 east (14.2 miles) to Exit 15

Re-enter I-76 at the Pittsburgh Interchange, Exit 57.

Follow signs to Harrisburg and east

WESTBOUND TRAFFIC Exiting at Pittsburgh Interchange:

I-376 west (16 miles) to

I-279 north Ft. Duquesne Bridge, bear right on bridge to

State Route 28 north (23 miles) to

Harmarville Exit, State Route 910 east (.1 mile)

Left on to Freeport Road (.7 mile)

Re-enter I-76 at the Allegheny Valley Interchange, Exit 48

Follow signs to Ohio and west.

During the closure, expect higher traffic volumes on detour roads. Message boards will be in place to inform customers of the closure.

Throughout the evening prior to the closure, information will be posted at the Oakmont/Plum service plaza to warn customers that they will not be permitted to continue driving after 11 p.m. on March 27.

Once the roadway is opened to traffic, a single-lane pattern will be in effect in the project area until 11 a.m. on March 28.

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