Authorizing the Sabine Lake Bridge and Causeway Authority, Hereby Created, and its Successors, To Construct, Maintain, and Operate Bridges over Sabine Lake, at or near Port Arthur, Texas; To Construct, Maintain, and Operate all Causeways, Approaches, and Appurtenances Pertaining Thereto; and To Finance Said Objects by the Issuance of Bonds Secured by the Said Properties and Income and Revenues; and Repealing all Laws Heretofore Enacted, or Parts Thereof, in Conflict Herewith