Transportation Code, §201.612 provides that a political subdivision or private entity authorized to construct or finance the construction of a bridge over the Rio Grande must obtain approval from the Texas Transportation Commission and the United States under Subchapter IV, Chapter 11, Title 33, United States Code, for the construction of the bridge. Transportation Code, §201.612 directs the department to allow an applicant to concurrently seek approval from the commission and the United States. This subchapter prescribes the procedures and conditions by which a political subdivision or private entity may obtain the approval of the commission.