VESSEL 1 (SD 828 DF) WAS TRAVELING NORTH AT A SLOW CRUISING SPEED (25-30 MPH).  VESSEL 2 (SD 2423 AA) WAS TRAVELING SOUTH AT A SLOW CRUISING SPEED (25-30 MPH).  BOTH VESSELS WERE OPERATING WITH NAVIGATION LIGHTS FULLY LIT AND WERE TRAVELING IN A PREDOMINATELY STRAIGHT COURSE.

AT APPROXIMATELY 9:30 PM BOTH VESSELS APPROACHED THE I-90 BRIDGE.  VESSEL 2 BEGAN TO SLOW IN PREPERATION FOR FISHING.  THE OPERATORS OF BOTH VESSELS BECAME AWARE OF THE OTHER VESSEL AT APPROXIMATELY THE SAME TIME (WITH <30 FEET SEPERATION) AND IMMEDIATELY TURNED THEIR RESPECTIVE VESSEL RIGHT.  THE VESSELS COLLIDED PORT SIDE TO PORT SIDE, CAUSING EXTENSIVE DAMAGE TO EACH VESSEL.

THERE WERE NO INJURIES REPORTED.  O/O OF EACH VESSEL SUBMITTED TO A PRELIMINARY BREATH TEST AT THE REQUEST OF THE RESPONDING WCO.  BOTH OPERATORS PBT RESULTS WERE 0.000.

DAMAGE TO VESSEL 1:  EXTENSIVE BUCKLING OF PORT SIDE ALUMINUM SKIN
                                     BUCKLING OF BOAT FLOOR NEAR IMPACT SITE (NEAR WINDSHIELD).
                                     CRACKING/BUCKLING OF STORAGE COMPARTMENTS AND DASH STRUCTURE.
                                     RIVETS IN SKIN POPPED/LOOSENED ALLOWING WATER TO ENTER BOAT.

DAMAGE TO VESSEL 2:  EXTENSIVE BUCKLING OF PORT SIDE ALUMINUM SKIN.
                                      POSSIBLE/PROBABLE DAMAGE TO STRUCTURAL COMPONENTS IN PORT SIDE.
CHAMBERLAIN                   