RedactedNarrative: Operator was in his 21' Regal Runabout open motorboat towing two tubers on Mayfield Lake.  They were traveling north on the Cowlitz River arm of the lake, approximately 150-200 ft from the shore across from the state park when he collided with an unmarked, fixed object just below the surface of the water (not visible).  The impact caused severe damage to the outdrive.
  
  Damage was estimated at $7,600.00.  There were no injuries.
NameOfBodyOfWater: Mayfield Lake
NearestCityTown: Mossyrock                     