At approximately 1215 hours on 06/18/11, operator of CF8265 NX (Vessel #1) was traveling north in the Overton Arm portion of Lake Mead. operator estimated his speed to be approximtely 50 mph and his party was located on the west side of center channel straight out from Cathedral Cove, when Vessel #1 struck a submerged reef.  The reef structure was located approximately 16 inches below the water line and no rock hazard navigational aids were currently placed at the site. As Vessel #1 struck the reef, the engine stopped almost immediately and the vessel came to rest gradually with momentum,  and all passengers remained in the vessel unharmed. operator stated he did not see any discoloration on the the water to indicate shallow water conditions. Vessel #1 sustained severe damage to the lower unit, which was removed upon impact. There was also moderate fiberglass damage near the transom on the keel portion of the hull.
Overton                       