The crash, which took place shortly after 10 a.m. on Highway 29 north of Butts Canyon Road, sent both 43-year-old Suzanne Wallahan of Middletown and Brittany Franklin, 18, of Clearlake to the hospital, according to California Highway Patrol Officer Steve Tanguay.
Franklin was driving a 2008 Chevrolet northbound on Highway 29 when, for an unknown reason, she allowed her vehicle to drift to the right and began to leave the roadway, Tanguay said.
He explained that Franklin then turned her car back to the left and entered the southbound lane of traffic directly in front of the 2004 Nissan truck Wallahan was driving.
The two vehicles collided head-on and the Nissan truck went down a dirt embankment to the west of the roadway, while the Chevrolet came to rest blocking both traffic lanes, Tanguay said.
He said both drivers were transported by air ambulance to U.C. Davis Medical Center for injuries sustained in this collision.
The roadway was completely blocked, and then open for one-way traffic control for just over an hour, Tanguay reported.
Alcohol and drugs are not considered factors in the collision, which CHP Officer Brian Engle is investigating.
Another major injury crash occurred on Highway 20 near Clearlake Oaks shortly after 6 p.m., according to the CHP.
The head-on collision reportedly involved two vehicles and blocked a portion of the highway, based on initial reports from the scene.
Additional details weren't immediately available Tuesday evening.
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