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The national stardard is 13'6" total bridge clearance. The interstate system
has 4.9 meters or slightly over 16 feet vertical bridge clearance. Some
places it is only 14.1 feet in urban areas, where there are alternatives of 16
feet, so you need to check the route. Most states have the 13'6" as the
common vertical clearance without a permit.
Most truck stops sell motor carriers or truckers atlas, which show clearances
and routes, as well as restrictions.
If you exceed the limit, many states will require a pole car/truck to go in
front of the load, to be sure that the height will clear power lines and
bridges etc. Many bridges have designated routes around them. Both the pole
car and bypasses delay the trip and cost more in both permits and driver's
time etc. If you can keep the boat's beam less than 10 feet, Over all length
(including tow vehicle and all overhangs) less than 65 feet and height less
than 13'6", then a simple wide load permit, without escort vehicles and time
restrictions will make the haul much cheaper.
Many times a flying bridge or other attatchments have to be removed to get the
boat down to an acceptable height. Some trailers can get the keel as low as
6" off the ground--but many are a foot or slightly more. So you will want to
check the type of trailer the carrier has. If you go with an expiditor, they
will know what the operator's trailer's restrictions are.
Bob Austin
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