The Allegheny River Turnpike Bridge carries
Interstate 76
Interstate 76 may refer to:
Interstate Highways in the United States
* Interstate 76 (Colorado–Nebraska)
* Interstate 76 (Ohio–New Jersey), running through Pennsylvania
Video gaming
* ''Interstate '76
''Interstate '76'' is a vehicular ...
(
Pennsylvania Turnpike
The Pennsylvania Turnpike (Penna Turnpike or PA Turnpike) is a toll highway operated by the Pennsylvania Turnpike Commission (PTC) in the U.S. state of Pennsylvania. A controlled-access highway, it runs for across the state. The turnpike's we ...
) over the
Allegheny River
The Allegheny River ( ) is a long headwater stream of the Ohio River in western Pennsylvania and New York (state), New York. The Allegheny River runs from its headwaters just below the middle of Pennsylvania's northern border northwesterly into ...
. The structure features a pair of twin 2,350’ cast-in-place concrete segmental bridges. This is the first of its type in Pennsylvania. It was constructed between 2007 and 2010 and is the second bridge to stand on this site. The original
truss bridge
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements (typically straight) may be stressed from tension, compression, or ...
was built between 1949 and 1951 by the engineering firm Modjeski & Masters; the crossing predates the Interstate System by several years.
The replacement bridge was designed by the engineering firm Figg and built by Walsh Construction. The purpose of the new structure was to increase the capacity of traffic from two lanes in each direction to three; this was done to eliminate a bottleneck at the exit with
Pennsylvania Route 28
Pennsylvania Route 28 (PA 28) is a major state highway which runs for from Anderson Street in Pittsburgh to U.S. Route 219 (US 219) in Brockway in Pennsylvania. From Pittsburgh to Kittanning it is a limited access expressway named the ...
, which branches off at the bridge approach on the Harmar side of the rive
The replacement eastbound bridge opened in November 2009. It carried both eastbound and westbound traffic across the Allegheny River until the project was finished one year later.
On Tuesday, July 13, 2010, just after 10 a.m., the old steel structure of the Allegheny River Bridge was imploded with
Demolition, controlled demolition explosives. Roadway traffic was stopped for approximately 15–20 minutes, and river traffic was stopped for 24 hours for cleanup of the debris from the bridge.
See also
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List of crossings of the Allegheny River
This is a list of current bridges and other crossings of the Allegheny River starting from Pittsburgh, Pennsylvania, where it joins the Monongahela to form the Ohio River.
Crossings
Pennsylvania
New York
Pennsylvania
See also
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* ...
External links
Allegheny River Bridge at Pghbridges.com*
{{Pennsylvania Turnpike Commission
Bridges over the Allegheny River
Bridges in Allegheny County, Pennsylvania
Road bridges in Pennsylvania
Pennsylvania Turnpike Commission
Interstate 76 (Ohio–New Jersey)
Bridges on the Interstate Highway System
Steel bridges in the United States
Girder bridges in the United States