RedactedNarrative: V1 began entering Felsenthal NWR from the Ouachita River through the "Hibbie Cut" access at 04:00.  V1 was in a single file line containing approximately 20 or more vessels that were also entering the refuge. While motoring, V1's operator stated he overtook a slower vessel in a straightway which is lined with cypress trees on both sides of the channel. V1 then overtook a second vessel as he exited the first curve of the channel.  While attempting to overtake a 3rd vessel, the operator of that vessel did not maintain the speed which V1 operator anticipated.  V1 was unable to overtake the vessel before colliding with a fixed object (cypress tree); which at this point had become scattered throughout the channel.   
  
  It just so happened several Wildlife Officers were in the area to begin a boating safety checkpoint; they were able to quickly dispatch to the scene and secure it and render aid to V1's occupants.  V1's operator thrown toward the bow of V1, but was wearing the kill-switch which disabled the motor. Occupant 2 was ejected out of V1 but retrieved by Officers uninjured.  Occupant 3 was thrown into the bow of V1 resulting in 4 broken ribs, a punctured lung and lacerations to his face that required stitches.  All occupants of V1 were wearing PFDs. Also, it was discovered that V1 was overhorsepowered...not only did they violate the refuge horsepower restriction limit but also the manufacturer's capacity plate rated V1 for a maximum of 50 horsepower - it had a 60 horsepower motor mounted on it.