While on patrol, Sheriff Deputy observed Vessel #1 sinking whle operating across the lake.  Engine became submerged and boat stopped running.  Passengers jumped in water without life jackets and were pulled from the water without injuries.  Operator was arrested for OUIL watercraft.  Investigtion showed that a weld on the starboard pontoon broke and the pontoon took on water.  Vessel was towed to shore before sinking completely.
Commerce Township             