Rich,
If you haven't done so, it would be a good idea to confirm your "air draft". An easy time to do this is when you go up the mast to take down the windvane. Take a 50'' steel tape with you. Measure to the boom goose neck. Next, swing the boom out over the water and level it with a carpenter's level. Then measure from the boom to the water surface. Finally, measure the height the boot stripe is above the water. It may be 2"+ less when the boat is fully
loaded for your trip.
Being sure of your height will make the early bridges much less stressful.
Carl