Lilly Bridge

Location: Summers County, WV

Owner: WV Division of Highways, District 9

General Contractor: Brayman Construction Corp.

Value: $28.9 Million

Date Complete: June 2016

 

Built in 1950 by Virginia Bridge Company, Lilly Bridge spans Bluestone Lake in Summers County, WV, and is one of only seven remaining cantilever truss bridges in the state. Constructed as part of the Flood Control Act to build the Bluestone Dam, Lilly Bridge is recognized by the National Register of Historic Places.

Brayman was awarded the contract to replace this 1,164-foot long historic bridge. Carrying WV Route 20 traffic, the unique cantilever truss bridge is supported by its two abutments and 4 piers. The scope of the new bridge replacement project involves constructing a new 5-span, fabricated, structural-steel girder bridge, adjacent to the existing bridge.

This project involves a large Value Engineering design to construct 10’ diameter, drilled shafts for the piers, founded in bedrock at depths exceeding 70 feet. As a result of the heavily silted lake bottom, the new bridge design requires extremely tall and slender substructure units. The piers are single-shaft, single-column designs that are 10’ in diameter and over 140’ in height.

The south abutment of the new bridge will be founded on a spread footing, but the north abutment will be constructed on 30 EA – 135’ long micropiles installed through an existing fill of cobbles and boulders. Finally, the project will include the removal of over 250,000 cubic yards of rock to re-align the existing roadway onto the new bridge.