A South Dakota man was killed in a motorcycle accident in northwest Iowa late Friday or early Saturday. At 9:52 AM Saturday, the Sioux County Sheriff’s office received a 9-1-1 call reporting a one-vehicle accident which had occurred approximately three miles north of Hawarden on Highway 10.

The caller noticed damage to their mailbox on Saturday morning and it was then that the accident was discovered. The investigation revealed that 50-year-old Dave Bousum of Olivet, South Dakota had been northbound on Highway 10 on a motorcycle. Bousum left the roadway and struck a mailbox post. Bousum was thrown from the motorcycle and came to rest on the banks of the Big Sioux River. He was pronounced dead at the scene.