There have been MANY other postings here on the SSECN about a shallow water bar at the entrance to the Suwanee River, from the Gulf’s waters. Never before, however, have we heard of someone with a draft of 15.5 inches having problems. Looks like Tranqilo found deeper water with a bit of work.
And, their note about “avoiding all shoals” may be a bit optimistic. I have never found more than 4 1/2 feet of water over the entrance bar a low tide.

Our draft is 15.5 inches. We had 1 problem with shoaling at low tide coming out of Suwannee River. We are able to pole back into deep water with a boat hook and a zodiac paddle. A route can be plotted that avoids all shoals. Try a mid tide for entry into any of the well-marked channels to these out of the way places.
Tranquilo