The Iowa State Patrol says a Humboldt man died after his tractor collided with a semi late Friday night. Lt. Kelly Hindman reports 81 year-old Harold Hinners was operating a 1980 Allis Chalmers 7010 farm tractor eastbound on Humboldt County Road C-29 pulling a grain wagon. At the same time, a semi operated by 72 year-old Dayton resident Calvin Mogler was driving eastbound behind the tractor. The tractor approached the intersection of Juniper Avenue and began to turn left. Mogler pulled out the semi to pass the farm tractor when they collided at the intersection. Hinners was pronounced dead due to injuries sustained during the collision while Mogler was not injured. The Iowa State Patrol continues to investigate.