Investigators have released a sketch of the man they say grabbed the woman on one of the trails at Hanns Park that parallels Redwood Parkway from Skyline Drive to Oakwood Avenue.
According to Sgt. Kevin Coelho, the man came up from behind and choked her, and then tried to drag her to a nearby creek bed but she fought back and managed to escape.
Coelho says the man then fled in a vehicle that had been parked in the parking lot. It's described as a 1995 to 2000 silver or gray 2-door Acura Integra with gray primer on the rear bumper and fender area.
Police have revised the suspect's description. They say he is around 5 feet 4 inches and 210 pounds. They had previously said he was 5 feet 10 inches.
Anyone with information is asked to call detective Drew Ramsey or Sgt. Coelho at (800) 488-9383
(Bay City News contributed to this report)