Tex. Loc. Gov't Code § 321.102
The commissioners court of a county by order may adopt reasonable rules on camping, access, litter, resource protection, or waste disposal if the rules:
(2) apply only in the following locations controlled or maintained by the county:
Added by Acts 2019, 86th Leg., R.S., Ch. 226 (H.B. 1628), Sec. 1, eff. September 1, 2019.