(Estacada, OR)  --  A motorcyclist is being treated for serious injuries after he crashed and fell down a 75-foot embankment in Estacada [[ ESS-tuh-KAY-duh ]].  Police say the 59-year-old man was traveling along the Clackamas Highway when he crashed into a guard rail, which sent him down the embankment.  A rescue crew pulled the man up with a rope after he was placed on a stretcher.  He's expected to survive.