Cianbro replaced Bridge 8, a historic double-leaf bascule bridge that carries U.S. Route 2 over Lake Champlain between the towns of North Hero and Grand Isle. Bridge 8 is the only vehicular movable bridge in the State of Vermont and was replaced on a new foundation, with a similar aesthetic and the same draw width as the existing bridge built in 1953. The project’s purpose was to ensure safe passage by providing a structurally stable roadway for the traveling public. Specifically, the project involved the replacement of the existing bridge along with associated roadway improvements and incidental items. Consistent with the existing bridge structure, the new bridge provides an 80+ foot wide navigation channel with 10 feet of clearance in the closed position (ordinary high water) and unlimited vertical clearance when open.
Due to the excessive traffic detour distance, a temporary bridge was established during construction of the new bridge. The temporary bridge (single leaf bascule) provided two lanes of vehicular traffic and had a 40-foot wide navigation channel. In the closed position, the under clearance is 10 feet (ordinary high water).