ICW Information by ICW Statute Mile Marker
STM 401 to 500
Latest Update: 19 Oct 2018
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STM: 401.1
Fixed Bridge: Lafayette
Note: Reported vertical clearance: 65'
STM: 403
Nav. Marker / Location: Georgetown
STM: 403
Nav. Marker / Location: Near Georgetown
Note: Hobcaw Barony. A 17,500-acre wildlife refuge owned by the Belle W. Baruch Foundation a non-profit organization. Located E of Georgetown, it can be visited by car or tour companies.
STM: 403
Nav. Marker / Location: Near Georgetown
Note: Hopsewee Plantation. Located near Georgetown
STM: 410.5
Nav. Marker / Location: Mouth of Minim Ck Cut
Date: 4 Nov 2014;
Vessel Reporting: Onward
Note: Shoaling
D @ CL = ~8.0' @ Td = +1' @ South Island Ferry TS
Plowed mud ~5.7' @ inside N mouth of cut just to N of CL
STM: 430.8
Nav. Marker / Location: G37 to G39; Junction with Five Fathom Creek
Vessel Reporting: Onward
Date: 9 Apr 2014, 0930 hrs
Note: Encountered depths of ~ 5.2' on the G (E) side of the channel between G39 and G37 while traveling north. The bottom was soft mud that enabled Onward (6.2' draft) to power through. Deeper water seems to be closer to R (W) side. Tide was +1.2 feet and falling at Bulls Bay, Jeremy Ck tide station (1.7 nm away).
STM: 458.8
Fixed Bridge: Isle of Palms
Note: Reported vertical clearance: 65'
STM: 460
Nav. Marker / Location:
Vessel Reporting: Onward
Date: 8 April 2014; 1315 hrs
Report: Saw 7.8' on the centerline. Tide -= +2.0' at nearby tide station.
STM: 462.3
Single-Pivot Swing Bridge: Ben Sawyer
Note: Bridge ceases operation in strong winds. The approach from the N is subject to sever shoaling.
STM: 469
Nav. Marker / Location: Charleston SC
STM: 469.2
Nav. Marker / Location: Anchorage W of Charleston City Marina
Vessel Reporting: Onward
Date: Nov 08
Report: There is a substantial amount of concrete rubble debris on the bottom as reported by a Tow Boat U.S. diver who freed Onward's anchor chain from being snagged under a piece of concrete.
Note: Caution when anchoring in this area particularly in adverse weather. There is a very strong tidal current in this anchorage. Strong winds associated with passing fronts or squalls that oppose the current will cause many boats to move strangely on their anchor rodes. There are many local boats that have fore and aft anchors so they do not move as expected.
STM: 469.9
Fixed Bridge: Mark Clark Expressway
Note: Reported vertical clearance: 65'
STM: 470.8
Double-Bascule Bridge: Wapoo Creek
Note: Bridge Schedule change as of 9 March 2018; US Code of Federal Regulations:
117.911 Atlantic Intracoastal Waterway, Little River to Savannah River.
(d) SR 171/700 (Wappoo Cut) Bridge across Wappoo Creek, mile 470.8, at Charleston, SC. The draw shall open on signal; except that the draw need not open from 6 a.m. to 9:29 a.m. and 3:31 p.m. to 7 p.m., Monday through Friday, except Federal holidays. Between 9:30 a.m. and 3:30 p.m., Monday through Friday, except Federal holidays, the draw need open only once an hour on the half hour. Dated: March 9, 2018.
STM: 479.3
Fixed Bridge: John F. Limehouse
Note: Reported vertical clearance: 65' There are lights hanging below the bridge at the center and over both edges of the channel. There are also drain pipes protruding below the beams.
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