(Gresham, OR)  --  A man who's accused of sexually assaulting a young woman as she was walking to work in Gresham is in police custody.  Authorities say 25-year-old Orion Storm Mears is suspected of approaching the 19-year-old woman on Southeast Powell Valley Road last week, forcing her off the sidewalk, and assaulting her.  Mears was arrested yesterday in Portland and has been booked on multiple charges.  Police say tips from the public led them to the suspect.