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Low Water Conditions


What does this mean?
  • Tidal stations - when a station is 1.5 feet below Mean Lower Low Water (MLLW) for at least 18 minutes continually.
  • Great Lakes stations - when the average of the previous 12 hours of observations were found to be below the elevation of Low Water Datum (LWD).
  • Use caution when transiting these areas as depth soundings may be less than those found on the NOAA nautical charts.

Stations currently in low water condition


Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services