Michael Dale Bryant, 20, of Lakeport was arrested following the wreck, which occurred at 12:45 a.m. Saturday on Lakeshore Boulevard north of Deer Hill Lane in north Lakeport, according to the California Highway Patrol.
The CHP said Bryant was driving his 1997 Chevy 1500 pickup southbound on Lakeshore Boulevard with 17-year-old Shayla Munch, also of Lakeport, riding as his passenger.
For reasons the CHP said are yet to be determined, Bryant lost control of his pickup and exited a curve in the roadway.
Bryant’s pickup veered across the northbound lane of Lakeshore Boulevard, with the front of the truck hitting a post before exiting the shoulder and going into a ditch. The CHP said the pickup came to rest on its roof, east of Lakeshore Boulevard.
Bryant was not wearing his seatbelt and was partially ejected from the pickup, the CHP said.
The CHP said Bryant suffered major injuries to his right arm, shoulder and head, and was transported by REACH air ambulance to Kaiser Hospital in Vacaville.
Alcohol was determined to be a factor in the crash and the CHP said Bryant was placed under arrest prior to being transported to the hospital.
Munch, who was riding in the right front seat, was wearing a lap and safety belt at the time of the crash. The CHP said she sustained major injuries to her head and face.
The CHP said Munch was transported to Sutter Lakeside Hospital before she was flown by REACH air ambulance to UC Davis Medical Center.
CHP Officer Kory Reynolds said he did not have an update on the conditions of Bryant or Munch on Wednesday.
The cause of the collision is still under investigation, the CHP said.
Email Elizabeth Larson at