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Phase II - Allegheny Tunnel Traffic Relief Study
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| Service: | Preliminary tunnel improvement study including alignment and tunnel design
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| Estimated cost: | Commencement: | February 28, 1998
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Completion date: | December 30, 1998
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| Location: | Allegheny, PA United States |
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| Technical data: | Preliminary alignment study looking at four new tunnel options and rehabilitation of the existing tunnels. Design of two to four lane highway tunnels up to 6100 ft (1860 m) in length supported with rockbolts, reinforced shotcrete and lattice griders. |
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| Geology description: | Interbedded Shales and Sandstones with Limestone interbeds, Coal and Claystones. Decomposed to highly weathered fractured rock at the tunnel portals. |
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