Marmet Locks and Dams

Seemingly everything about the $270-million Marmet Lock Replacement Project was of a large scale. Kokosing joined efforts with Fru-Con Construction Corp., as part of a joint-venture, on this more than six-year, U.S. Army Corp. of Engineers project outside Charleston, W.Va.

Construction of the 110-foot-by-800-foot lock chamber entailed Kokosing moving 2.9-million cubic yards (cy) of earth and 107,000 cy of rock. In the piling portion of the project, Kokosing installed 216,000 linear feet (lf) of flat sheet piling and value-engineered the installation of 105,000 lf of Z-piling. In self-performing the concrete work, Kokosing installed and operated a batch plant, which batched, hauled and placed 320,000 cy of concrete. Included in this concrete work was the team’s installation of 2,400 tons of rebar and 906 tons of embedded metals.

To help build and maneuver the massive lock chamber system, which included the installation of miter gates totaling 675 tons, Kokosing utilized marine-based equipment to load, transport and install 23,500-ton concrete beams for the guard and guide wall construction.

Following the locks’ construction, Kokosing completed the miscellaneous site work, which included final grading and seeding.