On Tue, 10 Jul 2007 20:03:10 -0400, "Blueskies"
wrote in
:

(c) Over other than congested areas. An altitude of 500 feet above the surface, except over open water or sparsely
populated areas. In those cases, the aircraft may not be operated closer than 500 feet to any person, vessel, vehicle,
or structure.

Note "Structure" here. The bridge is a structure, and unless it was over 500' above the water, the pilot was in
violation.

That's a reasonable interpretation. So it may be within FAA
regulations to fly under high bridges.