RedactedNarrative: On saturday, march 14, 2015, operator operated a recreational vessel on douglas lake, jefferson county, tennessee with a single passenger. The vessel, a lowe fishing boat with aluminum hull and outboard motor, bearing tennessee registration tn-7214-ec departed the dandridge access area ramp at approximately 07:55. Operator advised he brought his vessel up to a cruising speed of 35mph and departed upstream from the access area. Shortly after departing, operator''s vessel struck an unidentified object that was floating underneath the water''s surface. Upon inspecting the vessel after the collision, operator found his propeller and propeller shaft were missing from the outboard motor. Operator then deployed his trolling motor and returned to the dandridge access area ramp.