Interstate 79/279 Missing Ramps

SAI teamed with Michael Baker Corporation for the design of this important project to construct two missing interchange ramps at the I-79/279 interchange. As Michael Baker’s subconsultant SAI was responsible for the preliminary and final design of the overall signing and pavement marking plan, final right-of-way plan, the preliminary and final design of the Ramp H bridge that connects I-79 south bound to the Penn Lincoln Parkway West, and the design of retaining walls to allow for the widening of the Parkway from 4 to 6 lanes.

Physical features:

    • 640′ five-span curved prestressed concrete I-beam structure.
    • 1,224 LF of Steel Piling.
    • 381,000 lbs. of Reinforcing Bars.
    • Two Soldier Pile retaining walls: 965″ Long, 20′ High (Wall 1), and 120′ Long, 14′ High (Wall 5).
    • Arch culvert extension.

Other features:

  • Expansion of the existing ITS (Intelligent Transportation System) capabilities with the installation of variable message signs and cameras.
  • Installation of new destination signs.
  • Maintenance of traffic via phased construction.
  • Modification and extension of highway lighting system.

Client Owner: Pennsylvania Department of Transportation, District 11-0
Completion: 2009
Construction Cost: $67,500,000

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