This unique project for the US Army Corps of Engineers featured construction of four floating approach walls for the Olmsted Dam on the Ohio River. The walls are concrete pontoons up to 350 feet long that were built in a dry graving yard 50 miles upstream from the project and towed to the job. At the jobsite, the walls are anchored in place with a guide system that is founded on 10-foot-diameter drilled shafts.

Operating and Maintenance Bulkheads – On a separate contract at the same jobsite, Massman installed guides and erected twin 335 ton bulkheads, under very tight tolerances for the new locks. This work required a sophisticated erection plan to “thread-the-needle” with the large gates.