Indiana Conservation Officers are investigating an all-terrain vehicle accident that occurred March 22nd at the Redbird State Recreation Area in Greene County. 33-year-old Billy Utt of Linton was treated for back injuries at Greene County General Hospital. Authorities say Utt was not wearing a helmet, which is a requirement at Redbird. Utt was also operating an un-registered ATV with a suspended driver’s license. Utt told investigators his ATV stalled before cresting Powerline Hill and he landed on his back.