Mich. Comp. Laws § 141.13: County sinking fund commissioners; control of fund, application.

Sec. 3.

Said board of sinking fund commissioners shall have exclusive control of the money of the sinking fund, and shall faithfully apply the same whenever possible, or it may appear to the county's interests, to the payment of the principal and interest of the bonded indebtedness of the county, and to no other purpose whatever, excepting as herein otherwise provided.