Woolridge was driving a 2002 Chevy Impala that collided with a 2016 Kenworth semi driven by 28-year-old Jesse Gibson from North Little Rpulaski, Arkansas. Gibson was not injured.
Both vehicles came to rest in the median at mile marker 186 on Highway 18.
Authoroties say Woolridge was parked on the side right of the road and made a left turn directly into the path of the east-bound semi.
The Mason City Police Department, Mason City Fire, the Iowa State Patrol and the Iowa DOT assisted at the scene.