46 year old Stephen C Jameson of McFall was seriously injured after crashing his four-wheeler in Gentry County Saturday morning. Jameson was northbound on Lone Rock Trail Road, approximately 3 miles northwest of McFall. He was working cattle and lost control on the gravel roadway. Jameson went off the road, overturned and was ejected. Jameson was flown to K-U Medical Center in Kansas City, Kansas after temporary transport to Northwest Medical Center in Albany.