2013 Top 10 Roads - No. 6

Nov. 5, 2013

Project: I-79 Meadow lands interchange

Location: Washington County, Pa.

Cost: $23 million

Length: 1.42 miles

Designer: Gannett Fleming Inc.

Contractor: Swank Associated Cos. Inc.

Owner: Pennsylvania DOT

A split decision had unanimous support. Due to site constraints and environmental concerns, it was decided a split diamond interchange configuration was the way to go. A new northbound entrance ramp required the relocation of approximately 835 ft of the tributary to Chartiers Creek. The new channel also incorporated mitigation features including planting, mud sills, boulders and two wetland areas. To complete the interchange, S.R. 1047 needed to be relocated. This required the roadway to pass beneath existing I-79 to form the split diamond configuration.

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