RedactedNarrative: On October 24, 2015 operator was operating his vessel on Nickajack Lake in Marion County, Tennessee.  He was traveling down stream from Lakeshore Marina in Hamilton County, Tennessee to Hale''s Bar Marina in Marion County, Tennessee.  Operator1 did not take the left hand turn in the main river channel at the upstream entrance into Bennett Lake area of Nickajack.  He ran across a very shallow area just off the main river channel at an estimated speed of 30 mph, it is approximately 2 to 4 foot deep in that area.  At some point the vessel hit a large log and grounded in the shallow area.  The vessel sustained substantial damage to one outdrive and completely ripped off the other outdrive as well as sustaining damage to the bottom of the vessel.