Workers operated the lock and dam from inside this building. The lock’s mechanical equipment was housed on the upper story of the operation building in case of high water. The building features a curvilinear east elevation, while the west elevation mimics the smooth tapered design of the gate piers. It was constructed in a Modern Style, as seen in the minimal architectural features, except for the engaged Doric pilasters, frieze, and triglyphs, 1935. Operation building, 2020.