Mich. Comp. Laws § 408.1103

Sec. 3. A contracting agent, before advertising for bids on a state project, shall have the commissioner determine the prevailing rates of wages and fringe benefits for all classes of construction mechanics called for in the contract. A schedule of these rates shall be made a part of the specifications for the work to be performed and shall be printed on the bidding forms where the work is to be done by contract. If a contract is not awarded or construction undertaken within 90 days of the date of the commissioner's determination of prevailing rates of wages and fringe benefits, the commissioner shall make a redetermination before the contract is awarded.