Officials in Monona County say one man died and another suffered serious injury from all-terrain vehicle accidents Saturday evening. The Monona County Communications received a 911 call around 8:50pm Saturday, stating two all-terrain vehicles (ATV) had been involved in a collision on 185th Street, west of Birch Avenue. The Sheriff’s and ambulance were called to the scene. Once on the scene, officers and medical personnel located one ATV, a Yamaha, on the roadway and that driver in the south ditch. The other ATV was a Honda and was located in the north ditch while that driver was located just north of the vehicle. The driver of the Yamaha was identified as 31 year old Nathan Derocher of Onawa died at the scene as a result of his injuries. The driver of the Honda ATV, 21 year old Dalton Brown of Onawa was life-flighted to a Sioux City hospital in serious condition. The Iowa State Patrol, Burgess Ambulance, Whiting Fire and Rescue, Whiting Police Department, Mac One and Life Net all assisted at the scene. The collision remains under investigation by the Iowa State Patrol and Monona County Sheriff’s Office.