STURGIS — An 83-year-old woman died Friday morning when a trailered boat came unhitched and collided with her vehicle head-on 11 miles north of Sturgis.

Preliminary crash information indicates Carol J. Olson of Faith, the driver of a 2016 Chrysler 300, was traveling south on state Highway 79 near mile marker 124. At the same location, Cody A. Thomson of Summerset, 44, the driver of a 2022 Ford F-350 pulling a trailered pontoon boat, was traveling north when the trailer coupler disconnected from the pickup and the safety chains failed to control the trailer and boat.

The trailer and boat entered the southbound lane and collided with Olson's vehicle. The trailer, boat, and Chrysler came to rest on the southbound shoulder and in the west ditch. Olson received fatal injuries. There were no injuries to the driver and passenger of the pick-up, Steven R. Baumker, 44, of Rapid City.

The South Dakota Highway Patrol is investigating the crash. All information released so far is only preliminary.