The shallows reported below by Captains Denny and Diane, are NOT found along the AICW’s passage down North Edisto River. Rather, this shoal lies south (downstream) of the Waterway’s exit of the North Edisto via the Dawho River.
I have looked at chart 11517, and I think the shoal in question lies along the river’s southwestern banks. As noted below, it is unmarked, but charted, though it sounds like depths here are even less than shown on 11517.

And a quick note of a shoal that is not marked on the North Edisto River. It is directly across from Ledenwah Creek on the south side of river. At low tide we FOUND less than 2 feet, and yes we found it the hard way!!
Fair Winds and Following Seas
Denny & Diane