I arrived in the same area a few days ago. Heading across the Okee after I fix my busted alternator
I think, like you said, the charted depths near on each side of the bridge is a good indication of the depths through the side spans.
Also noticing where the local power boats use the side spans can help here. Even with thier draft
, which often could be near yours, I feel they would prefer to have a comfortable depth under hull
Lots of shallows in wide open waters around here. And the traffic is crazy on the weekends.
I did notice several local sailors using parts
of the area outside of the causeway bridge to Sanibel that I wouldn't venture into when I arrived from offshore
coming around from south of the island. So it's a matter of gaining local knowledge.
I've been accused of using the Braille method for acquiring this back in Alabama
. :-) And I have redundant depth sounders.