520 ILCS 5/1.8
The Department may establish and maintain refuges or public hunting areas upon any lands or waters owned by the Federal government by mutual consent of the Federal and State governments and upon any lands owned or leased by the State, with the consent and approval of the state department or agency having jurisdiction over such lands.
The Department may designate state managed lands and waters or portions thereof as wildlife refuges by administrative rule.
It shall be unlawful to take any species of wildlife on any property named as a wildlife refuge by the Department or other Department management areas except as provided by Section 2.25 and Administrative Rules.
The Department shall post the boundaries of such refuges and shall publish legal notices in accordance with the procedure set forth in Section 1.13 pertaining to the operation of Public Hunting Areas.
520 ILCS 5/1.8