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SC: Isle of Palms, shoaling MM 460 - 461
- Date Reported: Apr 26, 2025
- Reporter: Bob423
- Source: User
- Description:
Update: The shallowest part has been dredged!! The shallowest part is now 6.9 MLLW.
The Bob423 track has been updated to go straight through the shallow spot near MM 460. There is no longer a need to take the red dotted line loop south.
Note: As of 4/12/2025, there is an uncharted green floating buoy, G117C, off to the port side of the channel when going north. Its approximate location is shown in the photo. Several boats have grounded trying to honor it. G117C is not on any chart or in the light list, ignore it and follow the middle of the newly dredged channel as shown by the blue dotted line (the latest Bob423 track) in the photo. G117C used to mark the channel before dredging, and it has not been moved after dredging
See the charts below for the status of shoaling at the three shallowest spots as of 4/25/2025
USACE = US Army Corps of Engineers
ATONs = Aids TO Navigation such as buoys and daymarks
Aqua Map = a navigation app for Apple and Android devices
Bob423 Long Track = blue dotted line
How to download tracks - Lat / Lon: N 32° 47.274' / W 079° 48.391'
DISCLAIMER: Waterway Guide Media provides Navigation Alerts as a resource for planning purposes only and does not warrant the information included in the postings as accurate. Advice and descriptions contained in the alerts are not for navigation.
5 Boater Comments
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Comment by: Mark, Green Voyage, on Dec 18, 2024
Vessel Type: Sail
LOA: 38'
Draft: 5.5'Ran hard aground on the blue track 2 hours before low tide. 5.5 draft. MM 460.4. Take the detour!!
View location on the Waterway Guide Explorer
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Comment by: Hubert Hopkins on Nov 1, 2024
Vessel Type: Power
LOA: 42'
Draft: 4.0'There are two temporary Green buoys 117B and 117C just south of marker 117A at mile 460.3. They are very close to each other. I passed to the north of those and had 6' depth above MLLW. This follows the Bob423 track pretty closely.
My passage was exactly at low tide with 1' above MLLW so it was very shallow.
I believe that the "detour" would be less stress for some if the dredge is not blocking the channel. They were not working the day I went through.View location on the Waterway Guide Explorer
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Comment by: Rick Vicars on May 26, 2024
Vessel Type: Power
LOA: 45'
Draft: 5.0'5-16-24 No less than 8 ft (low tide) taking the alternate route avoiding the AICW shoaling.
View location on the Waterway Guide Explorer
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Comment by: Elizabeth Lenoski, Tranquilo, on May 15, 2024
Vessel Type: Sail
LOA: 36'
Draft: 5.0'Came through at 3' tide northbound. Bob alt route had no less than 11' of water. Dredging equipment is set up just south of the bridge and more was being brought in as we passed. Dredge is near center but plenty of space to get by.
View location on the Waterway Guide Explorer
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Comment by: Teresa Scott on May 6, 2024
Vessel Type: Sail
LOA: 40'
Draft: 5.5'Came through at low tide and used the detour. Lowest we saw was 7.8. A bit nerve wracking especially with a large MV who impatiently had to pass during this.
View location on the Waterway Guide Explorer
