Mich. Comp. Laws § 280.524

Sec. 524. The drainage board shall designate the treasurer of 1 of the counties involved as the treasurer for said board. He may designate 1 or more of his deputies who may act for him in the performance of any of his duties under this section. Such treasurer and any such deputy shall serve without additional compensation. He and each deputy county treasurer so designated shall furnish a bond in such sum as shall be fixed by the drainage board, conditioned upon the faithful discharge of his duties, the premium thereon to be paid by the drainage board. Moneys held by the treasurer shall be paid out only upon order of the drainage board, except that no such order shall be required for the payment of principal and interest on bonds.