According to information received by KMUD News from the California Highway Patrol:
On December 21, 2012 at approximately 5:54 am the California Highway Patrol responded to the report of a semi-truck collision on State Route 162 east of US-101 in Mendocino County. A semi-truck was traveling eastbound when the roadway surface gave way and slid downhill. The semi-truck driver was uninjured and was able to guide his vehicle across the crevice in the roadway. Damage to the semi-truck was limited to its trailer and there was no release of cargo or other materials. The portion of roadway that slid away is approximately 25' wide by 20' deep. SR-162 is closed to both eastbound and westbound traffic at this time.
The roadway will remain closed at mile post marker 1.75 until repairs can be made to the roadway. Alternate routes to the Covelo area are Dos Rios Rd. from the west and Mendocino Pass from the east. Holiday travelers are reminded that winter weather conditions and recent storms may make these alternate routes inaccessible to some vehicles and commercial vehicles should not attempt these roads.
Photos below are courtesy of Mendocino County Sheriff's Office.