Mich. Comp. Laws § 324.30718
Plans and specifications for a dam constructed or maintained under this part shall be prepared by a licensed professional engineer under the direction of the delegated authority. The plans and specifications shall be approved by the department before construction begins. The department shall review and approve or reject the plans and specifications within 30 days after they are received by the department. If the plans and specifications are rejected, the department shall propose changes in the plans and specifications that would result in their approval by the department. Bids for doing the work may be advertised in the manner the delegated authority directs. The contract shall be let to the lowest responsible bidder giving adequate security for the performance of the contract, but the delegated authority may reserve the right to reject any and all bids. The county may erect and maintain a dam as a work relief project in accordance with the law applicable to a work relief project.
MCL 324.30718