RedactedNarrative: Vessel without enough clearance struck underside of Davis Island Bridge, operator inexperience with new vessel. While north bound on Bayshore Boulevard just west of Davis Island I observed a Black Robolo brand recreational vessel, traveling in the water proceeding East between the north and south bound bridges of Davis Island. I saw from my angle of observation that the vessel did not appear to have clearance for the second bridge and pulled over to the side of the road.  
  
  The vessel had decelerated to a speed appropriate for safely navigating the narrow channel of the bridge. I saw Operator at the helm, I could see he maintained visible lookout of other vessel traffic in the area, However he seemed unaware of the clearance of his vessel, I attempted to signal Operator with my vehicle lights and horn, however he was already beginning to pass under the bridge. He maintained heading and speed as he passed under the bridge. 
  
  The radar dome on top of his vessel struck the bridge at the midpoint of the pass. I observed the radar dome stripped off of the hard fiberglass canopy of his vessel the radar bar broke off of the dome and fell overboard, the rest of the radar assembly was pushed down onto the fiberglass canopy and was dragged under the bridge.
  
  I proceeded to the far side of the bridge with emergency lights on, and made contact with Operator, I verified there were no injuries to personnel on board, and obtained contact information from Operator. Since I could see no place to safely dock the boat in the immediate area and for the safety of passengers I arranged to meet Operator at his home to finish information exchange and to photograph the damage to the vessel.
  