 Near the end of the decade, the last gaps in the route between Port Arthur, Texas and Abbeville were finally closed after three decades of planning.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.