Mich. Comp. Laws § 254.8

Sec. 8. The word “townships”, as used in the 2 last preceding sections, shall be deemed to include cities and incorporated villages, both in their relation to each other and to townships, and when the word commissioner is used with reference to townships, it shall be deemed to include the corporate authorities of cities and incorporated villages. And such commissioners or corporate authorities may make such equitable contracts with the corresponding authorities as will secure the construction, rebuilding or repairing and maintenance of such bridges as they may deem advisable.