A downed power pole as the result of a noon-time accident involving a camper will keep the lower part of 13th Street on Hospital Hill in Hood River closed for a few hours this afternoon.  Hood River Fire Chief Devon Wells says 13th Street from Sherman to Oak and State Street from 9th to 13th will be closed while Pacific Power crews work on installing the new pole.  The accident occurred around noon today.  Wells says the driver of the camper did not realize his slider was out while driving, and while coming down 13th sheared the power pole at the State Street intersection, which also brought down a power line on the nearby van.  Wells indicated the vehicles involved were removed safely, and no one was hurt.