From the California Highway Patrol:

On 11/14/2017 at approximately 1450 hours, a 2017 Peterbilt tractor/trailer combination hauling lumber driven by John Michael Turner was traveling south on US-101 southbound, south of the South Leggett overcrossing.  Turner allowed the combination of vehicles to drift off the west road edge down a dirt embankment causing the tractor trailer combination to overturn and the lumber to spill onto the embankment.  One lane of US-101 southbound was closed for emergency vehicles.  As a result of the collision, Turner sustained major injuries and was transported to Enloe Medical Center by Reach Air Ambulance.

Cal Fire, Leggett Volunteer Fire Department, City Ambulance and Reach Air assisted with medical aid and Caltrans assisted with traffic control. 

This incident remains under investigation by the California Highway Patrol-Garberville Area and DUI does not appear to be a factor.