Posted by Claiborne | Posted on 06-11-2012
The detailed, in-depth posting below is provided to the Salty Southeast Cruisers’ Net courtesy of our good friends, Captains Diana and Mark Doyle, authors of the very popular “On the Water Chartguides” (see http://http://www.onthewaterchartguides.com/). Mark and Diana are currently wending their way north along the AICW, and will be sending periodic articles to the SSECN.
Captains Mark and Diana are true professionals, and have a wealth of experience on how to research and report on coastal waters, particularly the AICW. The series of articles they are providing to the SSECN should prove to be particularly valuable to ANYONE cruising the Waterway well into 2013!
This posting concerns the Little Mud River section of the Georgia AICW. This “AICW Problem Stretch” is almost universally acknowledged to be the WORST of the worst for the entire run from Norfolk, VA to Miami, FL, or the other way around. This condition makes Diana and Mark’s article even MORE invaluable!!!
Diana and I transited northbound through Little Mud River, GA this morning on about a third-tide and rising. Wolf Island, South has a Spring Tidal Range (STR) of 7.8 feet. Our plan was to run the range, then enter the river, staying mid-channel, honoring the aids.
The entry range held good depths as can be seen on the first screenshot (13-16 feet at 2.7 feet above MLLW).
This screenshot also underscores the fact that you don’t typically “Drive the TV” … the Magenta Line or the charted channels … exactly. That would be a good way to get into trouble, especially in Georgia. On the entrance range, we were quite a bit off the charted channel center line.
My course line is dead-on Range B, presumably marking the deepest water.
The second screenshot shows a known trouble spot just north of G195. You can see some 6- to 7-foot soundings here … which translates to less than 4 feet at low water (soundings made at 2.8 feet above MLLW and rising).
The third screenshot shows another area of concern, around G193. At this daybeacon, and about 200 yards northwest, you’ll see some 8- and 9-foot soundings. These translate to less than 5 feet at low water (3.1 feet above MLLW).
No recommendation being made here. Just sharing data. The Salty Southeast Cruisers’ Net, Active Captain, Waterway Guide, and others sources also have data you may want to factor into your departure, transit, or piloting decisions.
As Captain, you’re in charge of driving the bus … and your mileage will certainly vary.
Mark & Diana Doyle
I hope you are alerting the ‘authorities’ to your very believeable data. It may help getting some dredging started.