Tex. Nat. Res. Code § 33.235

Coastal wetland used only for farming or ranching activities, including maintenance and repair of buildings, earthworks, and other structures, shall not be subject to any power of condemnation exercised pursuant to this subchapter. However, this exemption from condemnation shall terminate upon the receipt by any state or federal agency of an application for a permit, license, or other authorization to conduct on the wetland, activities other than farming and ranching activities, including irrigation and water well drilling, and activities necessary to exploration, development, or production of the underlying mineral estate.