Michigan Compiled Laws, Chapter 254. Bridges § 254.156

Sec. 6.IMPROVEMENT OF WORKS PURCHASED. At or before the time any such works shall be acquired by purchase, it shall be the duty of the commission to determine what repairs, replacements, additions or betterments will be necessary to place the works in safe and efficient condition for use, and to cause an estimate of the cost of such improvement to be made, and submitted to the commission by an engineer or engineers appointed by it; such improvements shall be ordered by the commission before the sale of any revenue bonds hereinafter authorized for the acquisition of such works, and shall be paid for out of the proceeds of such bonds.