The East coast fixed
ICW bridges are all 65' now and excepting the remaining opening bridges you have the clearance entirely. Crossing Lake Okeechobee and the
west coast that changes and is various.
Looking on any charting program (active capt, waterway guide) the latest info is usually available.
As mentioned previously, the issue is not masts but depth of
water and why are you "ducking in"
the various deep inlets are well marked and generally
commercial, with very high bridges.
The others are shallow and local knowledge only- particularly not someplace to shelter into with a storm and easterly winds.
more info would be needed on your draft/mast, and
hull speed under
power. This is important for some of the currents excess 3 knots and that provides another challenge.
Utilizing the
internet and desire to explore, spend time on waterway guide. com to see all the restrictions, hours of operations, and other hazards.
Potomac river is beautiful, but the woodrow wilson bridge to dc is only 70 feet and probably will not open without an act of god or trump.
fair winds