The Sherman County Sheriff’s Office says a $3,000 reward is being offered for any information leading to the arrest and conviction of those responsible for starting fires in Sherman and Wasco counties in recent weeks.  Sherman County Sheriff’s Sergeant Jeremy Shull says a pair of fires reported in Sherman County Wednesday evening came after there were seven fires reported between Sherman County and the Dufur area on Tuesday.  The largest of the fires burned 300 acres on Wednesday evening.  No structures have been damaged in the fires.  Shull says there were also two suspicious fires on July 23.  The State Fire Marshal and arson investigators have been notified and are investigating.  Anyone with information on the fires is asked to contact the Sherman County Sheriff’s Office at 541-565-3622.  The Sheriff’s Office added the reward is possible because of a $2,500 contribution from North Sherman Fire.