Hi and welcome -
The
ICW can be tricky in portions of FL, GA, SC and NC, not just with air
draft, but draft in general. For example, some places in GA may have 12-14 feet at MHW; at MLW however, depths may hover in the 6-8 foot range. We transited the Mud River/Altamaha Sound area of GA two weeks ago and at near high tide had only
9'-10' in some spots. Careful planning and attention to tide tables is essential.
The maximum fixed bridge clearance is 65' at MHW and I believe this is the standard for the entire ICW. Bridges off of the ICW will vary. There are a great many drawbridges in FL, particularly between
Miami and Ft. Pierce, which are restricted to scheduled opening times. When you arrive in the states, pick up a bridge opening schedule. Most bridges throughout the waterway will open on demand, with limited scheduled opening times to accommodate local road traffic.
Check
Skipper Bob's ICW updates page regularly - they've been a huge help with our trip planning on the ICW:
www.skipperbob.net/waterway.htm
Cheers!
Bill