Michigan Adventure By Thomtyl1 Jan 1, 1998 Date Michigan Adventure Opened It opened in 1956 Jan 2, 1998 When ThunderHawk first opened Jan 3, 1998 When Sivering Timbers first opened It was opened in May 1998 Jan 4, 1998 When Mad Mouse first opened Mad mouse opened in 1999 on August 7 Jan 5, 1998 when wild cat was first opened