(Toutle, WA)  --  A teenage boy is dead and his friend is injured, after their motorcycles crashed on a motocross track in Cowlitz County.  Authorities say 17-year-old Dylan Bunnell of Mulino, Oregon died when his motorcycle slammed into a water truck yesterday at the Riverdale Raceway east of Toutle, Washington.  His friend, 14-year-old Anthony Hamilton, Jr. of Dundee, Oregon, also crashed into the truck and is being hospitalized.  The driver of the truck wasn't injured.