33 CFR § 80.845 - Galveston, TX to Freeport, TX.
(a) A line drawn from Galveston North Jetty Light 6A to Galveston South Jetty Light 5A.
(b) A line formed by the centerline of the highway bridge over San Luis Pass.
(c) Lines formed by the centerlines of the highway bridges over the inlets to Christmas Bay (Cedar Cut) and Drum Bay.
(d) A line drawn from the seaward extremity of the Freeport North Jetty to Freeport Entrance Light 6; thence Freeport Entrance Light 7; thence the seaward extremity of Freeport South Jetty.