Silverwoo Theme Park is an amusement park located in northern Idaho, United States near the town of Athol on highway US 95. Owner Gary Norton opened the park in June 1988, and originally included a few carnival rides, a main street with shops, and an authentic steam train that traveled in a 30-minute loop around the owner's property. As the years went by, Silverwood expanded by adding more rides and attractions. In later years, the park's popularity soared with the opening of the popular Timber Terror (1996) and Tremors (1999) wooden roller coasters. In 2006, Silverwood introduced Panic Plunge - the 141 ft. drop tower.