SPRINGFIELD, Ill. - The Illinois Department of Natural Resources (IDNR) today announced select state historic sites will reopen to the public effective Tuesday, Jan. 26. All sites open to the public will return to staffing levels prior to their closure. Sites in regions 4 and 7 of the Restore Illinois plan, including Fort de Chartres, Fort Kaskaskia, Cahokia Mounds and Lewis & Clark, will remained closed until further notice.