U.S. Route 17 Washington Bypass

New construction system protects environmentally sensitive areas.

Constructing the new Washington Bypass, an upgraded alternative route for U.S. Route 17 in Beaufort County, N.C., created unique challenges beyond traditional bypass construction. The $192-million project, encompassing 6.8 miles of roads, includes two major interchanges and bridges that span environmentally sensitive lands. To meet the variety of needs, especially the goal of minimizing impact to wetlands, the construction team created an innovative gantry system that drives piles, sets precast bents, and erects beams. After the deck is cast, the gantry progresses to the next span.