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Bridges and Tunnels of Allegheny County and Pittsburgh, PA

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Description: A listing of the structures. Includes histories and photographs.
Bridges and Tunnels of Allegheny County and Pittsburgh, PA - pghbridges.com Once a flat sea floor, millions of years of erosion have carved the surface of Allegheny County into a maze of ridges and valleys. Pittsburgh sits where the Monongahela River from the south, and the Allegheny River from the north, join to form the Ohio. Many named and unnamed tributaries steadily cut through layers of sedimentary rock: limestone, sandstone, shale, coal.
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Page title:Bridges and Tunnels of Allegheny County and Pittsburgh, PA - pghbridges.com
Keywords:bridge, tunnel, bridges, tunnels, bridge pittsburgh, pittsburgh bridge, pittsburgh bridges, pittsburgh tunnels, bridges pittsburgh, tunnels pittsburgh, Allegheny County, PA, Pennsylvania, Pittsburgh, structure, truss, arch, beam, highway, road, railroad, engineering, civil engineering, trestle, viaduct, photo, history
Description:Photos, data and history for bridge and tunnel structures in Allegheny County and Pittsburgh, Pennsylvania.
IP-address:66.96.131.99

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Creation Date: 12-jan-2001
Expiration Date: 12-jan-2015