§ 535c. Approval of Secretary; commencement and completion requirements; extension of time limits

The approval of the Secretary of the department in which the Coast Guard is operating, as required by section 491 of this title , shall be given only subsequent to the President’s approval, as provided for in section 535b of this title , and shall be null and void unless the construction of the bridge is commenced within two years and completed within five years from the date of the Secretary’s approval: Provided, however , That the Secretary, for good cause shown, may extend for a reasonable time either or both of the time limits herein provided.