RedactedNarrative: On friday, march 30, 2018 at approximately 11:30 hours operator was operating his 1994 18''11" javelin bass boat on douglas reservoir.  Operator had launched his vessel at leadville access area in jefferson county.  Operator was traveling upstream from ramp at an idle speed.  He was headed to the confluence of the nolichucky river and french broad river to fish.  Operator stated the motor seamed sluggish and would not come on plane.  He stopped and looked in back hatch compartment and observed it was full of water. He then drove vessel to the bank bordering rankin wildlife management area. Operator called for help.  Upon my arrival i observed vessel filled with water just aft of operator seat.  The operator of a passing pontoon boat volunteered to tow vessel downstream to leadville access area.  Vessel rolled at boat ramp and a tow truck with boom was used to right vessel and place on operator''s trailer.  Upon inspection of vessel i observed the vessel''s drain was threaded and no drain plug was present.  Bilge pump and switches could not be tested due to wire damage as a result of batteries falling from compartments while boat was lifted inverted from water.  Operator stated that he did not know which switch worked bilge pump or if it was automatic.