RedactedNarrative: On Wednesday November 23 I, Officer of the Maryland Natural Resources Police, was on routine patrol on the Severn River approaching the Rt. 450 Bridge when I observed a large cabin vessel that had a large amount of smoke coming from the cabin area.
   
  I came along side the vessel and spoke with the operator who stated that around 9:00 A.M.  he was under way on his vessel when his high temperature alarm sounded. At the time the high temperature alarm sounded Operator smelled a burning odor coming from the engine compartment. Operator then activated the fire suppression system which was built into his vessel and turned off the motor along with the battery switches. 
    
  For safety sake I contacted DNR dispatch and advised them to start the fire boat to make sure there was no safety hazard and there was no more potential for an active fire to ignite on the vessel. Operator also contacted Tow. Boat U.S. who towed him into Back Creek in Annapolis. A short time later Annapolis Fire Boat arrived and advised that the impeller for the raw water coolant system had been blocked, thus causing the engine to overheat. When the engine overheated it caused the radiator cap to blow off further damaging the coolant line. The smoke that I had observed was steam coming from the damaged radiator. The Fire Department advised that the vessel was safe and there was no further potential for a fire to ignite. 
  
  Operator suffered no personal injures due to the accident and all events occurred in Anne Arundel County Maryland. 
  I advised Operator to contact me when he receives an estimated dollar amount of damage that occurred to the vessel.
  