 A swing bridge across the Sabine Lake at the state line was completed in 1958, and a gravel road connecting Grand Chenier and Pecan Island was completed soon afterward.Other improvements during this time include the construction of two more movable bridges along the route, beginning with a swing bridge across the Superior Canal east of Grand Chenier in 1956.The Mermentau River bridge at Grand Chenier was also replaced with the current span in 1959.