NOAA tide station 8665426 — Shem Creek

Shem Creek has its own NOAA tide prediction station: ID 8665426, name "SHEM CREEK AT 17" (i.e. at the Coleman Blvd / US 17 area), 32.7933 N, -79.8817 W, SC, EST. It is a subordinate (type "S") station, not an independent gauge: NOAA computes its predictions from reference station 8665530 (Charleston) using published offsets of high tide -2 minutes, low tide -3 minutes, with height ratios of 0.99 at high water and 1.00 at low water. In practical terms Shem Creek's published tide is within a few minutes and about 1% of the Charleston Harbor prediction. There is no separate published datum set (MHHW/MLLW/MN) for 8665426 — NOAA's datums record for that station is null. Verified 2026-09-04.