Southern Beltway Findlay Connector, Pittsburgh, Pa.

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Height restrictions, coal mine voids and acid mine drainage are the stickier parts of this project, which is located around the Pittsburgh International Airport. In total, the job will demand 313,000 sq yd of concrete paving, 15 million lb of structural steel for 21 bridges and 11.4 million cu yd of excavation. Total cost: $150 million.

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