The absolute minimum water depth available to complete the loop is 9 feet. This is the controlling depth on the inland rivers. While there are many passages on the loop with much less depth, they can be by-passed or transited at high tide. Captain Alan Lloyd Great Loop Navigation Notes _www.NavigationNotes.com_ (http://www.navigationnotes.com/) In a message dated 5/14/2012 8:06:18 P.M. Eastern Daylight Time, CaptJoe60@aol.com writes: His concern is with regard to the absolute minimum water depth available.