Captain John’s second reported shallow stretch (see below), is right on the money. Our on-site observations tend to indicate that the single shallowest section of the Florida Keys Inside/ICW route lies where the main channel intersects the northern reaches of the Tavernier Creek channel.
However, shallow water in Blackwater Sound, south of Jewfish Creek, is a new one on me. Anyone else seen thin soundings here. If so, please click the “Comment on This Posting/Marina/Anchorage/Bridge” link below, and share your information.

You won’t have any problem until you get down to MM1135 just after Jewfish Creek and again from MM1150-1153 Ramshorn Cut. Both of these had thin spots of only 5ft. Try to go with high tide through these areas and watch the wind. I’ve heard that a hard southern or eastern blow can lower the water by a foot or more.
John

Just went through there yesterday [2/24/11]. STAY ON THE MAGENTA LINE AND PASS THROUGH THIS AREA AT HIGH TIDE. It’s fine of you do this. I grew a few more gray hairs yesterday.
Larry

Click Here To Open A Chart View Window, Zoomed To the Florida Keys Inside Route’s Traversal of Blackwater Sound

Click Here To Open A Chart View Window, Zoomed To the Florida Keys Inside Route’s Intersection with the northern section of the Tavernier Creek channel