Submerged Lands
HOW TO DETERMINE THE MEAN LOW-WATER MARK
Mean low-water is the average low tide. An approximation
of mean low-water is made by observing the low-water mark
when the tide height is at 0.0 feet as indicated on a tide
table.
Tide tables may be obtained from marinas, harbor masters,
local newspapers, or at http://www.maineharbors.com.
On the tide table, find a time when a 0.0 foot tide is predicted
to occur in the local area. It may be necessary to adjust
for weather and local conditions.
Observe where the water's edge is in relation to the structure
at the specified time. This is the mean low-water mark.
The site plan example (PDF)
illustrates the location of the mean low-water mark.
For further assistance contact the staff at the Submerged
Lands Program in the Bureau of Parks and Lands.
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