Tex. Spec. Dists. Code § 5003.002 : SPECIAL DISTRICT LOCAL LAWS CODE — TRANSPORTATION — NAVIGATION DISTRICTS AND PORT AUTHORITIES — CALHOUN PORT AUTHORITY — GENERAL PROVISIONS — Nature and Purpose of Port Authority TEXT PDF The port authority is a navigation district. To the extent authorized by this chapter, the port authority is created to: (1) improve navigation in the port authority; and (2) maintain, develop, extend, and improve port facilities and wharf and dock facilities in the port authority. Tex. Spec. Dist. Loc. Laws § 5003.002 Amended By Acts 2009, 81st Leg., R.S., Ch. 87, Sec. 21.054, eff. 9/1/2009. Added by Acts 2007, 80th Leg., R.S., Ch. 920, Sec. 1.04, eff. 4/1/2009.