Description: The structure opened in 1969, replacing 17 locks to provide for a change in level of approximately 138 feet. Prior to the construction of the incline, barges needed 8 ... view allDescription: The structure opened in 1969, replacing 17 locks to provide for a change in level of approximately 138 feet. Prior to the construction of the incline, barges needed 8 to 13 hours, now just 4 minutes is needed! view less