(Mollala, OR)  --  The Clackamas County Sheriff's Office is investigating a crash that left a 20-year-old man dead near Mollala.  Authorities say the wreck happened around 7:30 Saturday evening at the intersection of South Kropf and Gibson roads.  The victim was a resident of Scotts Mills, but his name hasn't been released.  Deputies say alcohol and excessive speed were likely contributors to the crash.