The wooden dock at Barto Landing in Spring Valley was damaged Saturday when a boat owned by John Hammell of Ladd caught fire. According to Sgt. Robert Frazier of the Illinois State Conservation Police, the incident occurred at about 1:50 p.m., when Hammell started the vehicle, and it exploded. Spring Valley Police and fire departments responded to the scene. Firefighters moved the boat from the dock into the middle of the lagoon to prevent further dock damage and used foam to extinguish the blaze. The cause of the fire is under investigation by the conservation police.