Vessel 1 was operating on plane at about 20-25 miles per hour on Umbagog Lake.  The weather was clear, but it was windy and the water was rough.  The wind and waves were at the operators back.  The operator of vessel 1 describes the boat as leaning and turning suddenly to the left.  The operator of vessel 1 stated that the steering wheel turned sharply to the left and he could not control it.  Vessell 1 flipped over throwing all five passengers into the water.  One passenger was injured while being thrown from the boat.  Vessell 1 flipped over and sank in the lake.
Upton                         