ON 09/28/13 VESSEL 1 (V1) WAS BEING OPERATED BY OPERATOR 1 (O1) IN A SAILBOAT RACE ON LEWIS AND CLARK LAKE IN YANKTON COUNTY, SOUTH DAKOTA WITH TWO PASSENGERS (V1P1/V1P2) ON BOARD. O1 OPERATED V1 WEST WHILE COMPETING IN THE RACE. EVERYONE ON-BOARD V1 WORE A PFD.
VESSEL 2 (V2) WAS BEING OPERATED BY OPERATOR 2 (O2) WITH TWO PASSENGERS (V2P1/V2P2) ON BOARD. EVERYONE ON-BOARD V2 WORE A PFD. O2 OPERATED V2 NORTHWEST WHILE COMPETING WITH V1 IN THE SAILBOAT RACE. 
V2 WAS IN POSITION ON THE PORT SIDE (SOUTH) OF V1. AS V2 APPROACHED V1'S PORT SIDE, O2 MANEUVERED V2 TO TURN BEHIND V1. BECAUSE OF STRONG WINDS, V2 DID NOT HAVE ENOUGH ROOM TO MAKE THE TURN BEHIND V1 AND BOTH O1 AND O2 REALIZED THAT V1 AND V2 WOULD COLLIDE.
V2 WAS HEADING DIRECTLY AT THE CENTER OF THE PORT SIDE HULL ON V1. O2 WAS UNABLE TO CHANGE V2'S DIRECTION. V1 HAD THE RIGHT OF WAY BUT O1 ATTEMPTED TO TURN V1 AWAY FROM THE ONCOMING V2 TO AVOID COLLISION. O1 TURNED V1 SLIGHTLY TOWARD IT'S STARBOARD SIDE (NORTH) BUT WAS UNABLE TO MANEUVER V1 COMPLETELY OUT OF THE WAY OF V2. 
V2'S BOW, BOW RAIL AND ANCHOR COLLIDED INTO THE REAR PORT SIDE HULL AND RAIL OF V1. BOTH V1 AND V2 CONTINUED IN A NORTH-WESTERN DIRECTION AFTER THE COLLISION.
YANKTON