At 7:08 pm Friday, East Contra Costa Fire Protection District firefighters responded to a report of a motorcycle crash in the 1000 block of Finn Way in the City of Brentwood.
The incident took place off Twain Way behind Garin Parkway.
AMR was first on scene and located a motorcyclist down in the roadway. It was reported the subject was not wearing a helmet and was in and out of consciousness, however, he was breathing.
A medical helicopter was requested and was scheduled to land on the Liberty High School football field.
Update per Brentwood Police
BRENTWOOD, CA – On December 29, 2017, at around 7:00 PM, Brentwood officers responded to 1000 block of Finn Way to investigate a report of a male lying in the street bleeding from the head.
When officers arrived on scene it was determined the 21 year old male, Oakley resident had been involved in a solo motorcycle collision minutes prior and he was not wearing a safety helmet. Witnesses in the area reported the male riding recklessly just prior to the collision.
The male was air lifted to John Muir Hospital in Walnut Creek with a serious head injury. As of 9:00 PM, medical staff reported the male is in serious but stable condition.
Alcohol is believed to be a contributing factor in the collision.
The collision is currently under investigation by the Brentwood Police Department Traffic Unit. Anyone with information is asked to call Officer Mitch Alvarez at (925) 809-7741.