605 ILCS 5/10-714

Where a municipality desires to undertake a bridge project under this Division of this Article which involves property within the corporate limits of another municipality or municipalities, the powers designated in this Division of this Article shall not be exercised in respect to such property except with the consent of the corporate authorities of such other municipality or municipalities as evidenced by an ordinance or ordinances thereof. The municipalities involved may by agreement determine their respective rights, duties and obligations thereunder.