RedactedNarrative: Information gathered for this report was given by Unit 1 and 2.
  
  Unit 2 was an anchored watercraft on Fox Lake in Columbia Bay south of the channel which leads into Petite Lake from Fox Lake.  This area on Columbia Bay is a popular anchoring and swimming area for boats with families to swim from their boats because of the sand bottom and shallow water.  This known anchoring area had approximately 60-90 boats anchored at aprx 5:40 when I patrolled it. 
  
  Unit 2 was anchored approx 250'' from shore with very few boats close.
  
  I was informed that unit 1 was traveling between 15 and 20 MPH and some people informed me unit 1 was traveling greater that 20 MPH.
  
  Unit 1 hit unit 2 in the rear of unit 2. Unit 1 travelled up the swim platform and up over the rear transom (back) of unit 2. Unit 1 came to a stop on top of unit 2 rear deck, seats and engine cover.  No injuries.