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High Water Conditions


What does this mean?
  • Five or more of the last 10 six-minute readings at a tide gauge are 1.5 feet above the predicted water level.
  • There may be flooding in the area.

Stations currently in high water condition

Low Water Conditions


What does this mean?
  • 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.
*The elevation of LWD is the chart datum of a particular lake or section of a connecting river.
Stations currently in low water condition


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