NOAA tide station 8665530 — CHARLESTON (Customhouse Wharf)
Websiteapi.tidesandcurrents.noaa.gov
Published byNOAA
The authoritative tide predictions and water-level datums for Charleston Harbor come from NOAA CO-OPS station 8665530, listed in NOAA's station metadata as "CHARLESTON (Customhouse Wharf)" (the station-home page titles it "Charleston, Cooper River Entrance, SC"). Position 32.780834 N, -79.923615 W. Station established 1899-09-13; present installation 1990-04-25; NOAA chart 11524; time zone EST with DST observed. Published datums on the 1983-2001 tidal epoch (accepted 2003-04-17), in feet on station datum: MHHW 8.53, MHW 8.17, MTL 5.56, MSL 5.69, MLW 2.95, MLLW 2.76. The two range figures newcomers ask about: Mean Range of Tide (MN, MHW minus MLW) = 5.22 ft, and Great Diurnal Range (GT, MHHW minus MLLW) = 5.76 ft. Greenwich High Water Interval 0.41 h, Low Water Interval 6.63 h. Orthometric datum NAVD88. Verified 2026-09-04 via NOAA's own metadata API; the human-readable pages are tidesandcurrents.noaa.gov/stationhome.html?id=8665530 and /datums.html?id=8665530, which render via JavaScript.
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