FILE- In this May 5, 2006 file photo a group of Silverwood Theme Park employees ride up the Panic Plunge at the park in Athol, before it sent them free falling to the ground.
FILE- In this May 5, 2006 file photo Silverwood Theme Park employees (from left) Sparky Farley, Lynda Murphy, Rachel Roberts and Justin Henry react to the sudden pull of gravity as the Panic Plunge sends them free falling to the ground.
FILE- In this Aug. 1, 2006 file photo visitors shoot around a corner on Tremors at Silverwood Theme Park in Athol.
FILE- In this July 21, 2008 file photo riders scream as they feel the G-forces driving them into their seats on the new roller coaster, Aftershock, at Silverwood Theme Park.
FILE- In this July 21, 2008 file photo riders scream as they flip upside down multiple times on the new roller coaster, Aftershock, at Silverwood Theme Park. It was the first day for the ride. The ride takes riders as high as 191 feet above the ground, 65 miles per hour and up to 4.5 G's.
FILE- In thisMay 24, 2013 file photo Bailey Andrews, aquatic lifeguard supervisor for Silverwood Theme Park films the Spin Cycle at the amusement park near Athol, Idaho.