vertical clearance - The distance between the water level at chart datum and an overhead obstacle such as a bridge or power line.
(2) A man made structure crossing a body of water, usually for the use of automobiles or train. A boat intending to pass under a bridge needs to make sure it has sufficient vertical clearance unless it is a swinging bridge or a drawbridge.
 See also: Boat, Current, Line, Chart, Tackle
  
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