Shimmick rehabilitated the lock structure at the LaGrange Lock and Dam. The current structure consisted of a single 110-foot-wide by 600-foot-long lock with two miter gates and four tainter valves.
The contract for USACE included the removal and replacement of all the miter gate and tainter valve hydraulic and electrical control equipment, as well as the removal and replacement of the associated anchorages. Shimmick also dewatered and refaced the lock chamber and constructed and installed mechanical equipment-protection structures, cutting in new hydraulic piping trenches and resurfacing the horizontal surfaces. Scope also included construction of a new two-level concrete building, a concrete road, a parking lot, additions to the maintenance building, and a sewage lift station.
In the last 20 years, only one other Rock Island project exceeded the magnitude of the LaGrange project, but that project was split into multiple contracts and took nearly 10 years to execute, unlike LaGrange, which was substantially completed in a single construction season.