Texas Local Government Code - LOC GOV'T § 43.054. Width Requirements

(a) A municipality may not annex a publicly or privately owned area, including a strip of area following the course of a road, highway, river, stream, or creek, unless the width of the area at its narrowest point is at least 1,000 feet.

(b) The prohibition established by Subsection (a) does not apply if:

(c) Notwithstanding Subsection (a), a municipality with a population of 21,000 or more located in a county with a population of 100,000 or more may annex a publicly owned strip or similar area following the course of a road or highway for the purpose of annexing territory contiguous to the strip or area if the territory contiguous to the strip or area was formerly used or was to be used in connection with or by a superconducting super collider high-energy research facility.