70 ILCS 805/18.6
Each forest preserve district which issues bonds and constructs, equips, acquires, extends or improves any recreational facility or facilities under Sections 18.1 through 18.10 of this Act shall charge for the use thereof at a rate which at all times is deemed sufficient to provide for depreciation and to pay maintenance and operation costs and the principal and interest on such bonds. Such forest preserve district may provide for the construction, equipping, acquisition, improvement, and extension and may make, enact, and enforce all rules and regulations for the management, maintenance, care, protection and use of such facility or facilities. Charges or rates for the use of any such facility shall be established, revised, and maintained from time to time and shall be payable under the supervision of such board.
70 ILCS 805/18.6