Idaho Code § 67-4224

It shall be the duty of the board to acquire in the name of the state of Idaho by gift, devise, purchase, agreement, or otherwise, such land as in its judgment may be necessary, suitable and proper for roadside picnic, recreational or park purposes and to control, develop and maintain such land and all existing state parks, state monuments and state recreational areas heretofore established, acquired or designated to be used for such purposes, except state historical monuments. Administrative jurisdiction over all parks, park areas and recreational sites and areas, except wildlife access sites operated by the department of fish and game and roadside picnic areas under the jurisdiction of the department of highways [department of transportation] is hereby specifically transferred to the department of parks and recreation.