Jasper County, IA (June 10, 2026) – A Knoxville man died in a motorcycle crash on Highway 163 in Jasper County early Wednesday morning, June 10. According to the Iowa State Patrol, the fatal wreck occurred on the eastbound side of Hwy 163 between Prairie City and Monroe.
Investigators said 31-year-old Zachariah Paul Lewis Pollock was riding eastbound when his motorcycle left the roadway and overturned. The circumstances that caused the motorcycle to depart from the highway have not yet been released.
Pollock was pronounced dead at the scene. No other vehicles were reported to have been involved in the crash.
Additional details about the collision were not immediately available. Investigators continue to examine the factors that may have contributed to the wreck. We extend our heartfelt condolences to the family, friends, and loved ones of Zachariah Paul Lewis Pollock.
What Can Cause a Motorcycle to Leave the Roadway?
Single-vehicle motorcycle crashes often occur when a rider loses control and departs from the travel lane. A variety of factors can contribute to these crashes, including roadway curves, changing surface conditions, debris, weather, mechanical issues, or rider input.
Unlike larger vehicles, motorcycles rely heavily on balance and traction. Small changes in steering, braking, or road conditions can have a greater effect on stability. When a motorcycle leaves the pavement, uneven ground, ditches, or roadside obstacles can increase the likelihood of an overturn.
Investigators reviewing these crashes commonly examine tire marks, vehicle damage, roadway geometry, and environmental conditions. Understanding why a motorcycle left the roadway is often key to determining how the sequence of events unfolded and whether any external factors played a role.
