Photos of Operation Mississippi Freedom, which consisted of a 28-day joint operation to repair the Ensley Engineer Yard’s partially sunken 161ft by 30ft bridge. The bridge is a vital piece of the Memphis District infrastructure. It is one of only two access points to the fleet of dredges and material barges that transport over 175 million tons of cargo along the Mississippi River. The Memphis District is directly responsible for servicing 355 miles of the Mississippi River watershed, and failure to maintain these operations could cost the nation over a billion dollars in fuel and shipping costs.