ON APRIL 21, 2012, AT APPROXIMATELY 11:30 AM, O1 WAS OPERATING HIS 2004 CRESTLINER WITH P1 ABOARD.  BOTH OCCUPANTS WERE WEARING PFDS.  O1 WAS TRAVELING NORTHBOUND NEAR KIOWA GPA AREA ON THE EAST SIDE OF THE MISSOURI RIVER NORTH OF CHAMBERLAIN, SD.  O1 STATED THAT THE WAVES WERE APPROXIMATELY 4-5 FEET.  O1 NOTICED THAT THE BOAT WAS LEANING TO THE PORT SIDE.  O1 SAW THAT THE PORT SIDE PONTOON HAD A SPLIT NEAR ITS BOW.  O1 SAW THAT THE PONTOON WAS TAKING ON WATER, CAUSING THE ENTIRE BOAT TO LEAN TO THE PORT SIDE.  O1 BEACHED THE BOAT TO PREVENT IT FROM SINKING.   

O1 STATED THAT HE HAD NOT STRUCK ANYTHING IN THE WATER OR RUN THE BOAT AGROUND PRIOR TO NOTICING THE BOAT TAKING ON WATER. 

THE WATER CONDITIONS DID NOT ALLOW THE BOAT TO BE TOWED IN THE SAME DAY.  THE BOAT SUSTAINED ADDITIONAL DAMAGES TOWARDS THE STERNS OF BOTH PONTOONS.  THE LOWER UNIT OF THE MOTOR WAS ALSO DAMAGED.  O1 THOUGHT THE DAMAGE OCCURRED WHILE THE BOAT WAS BEING TOWED THROUGH THE SHALLOW WATERS.
CHAMBERLAIN                   