Datums for 8418150, Portland ME


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8418150, Portland, ME
Status: Superseded (Apr 17 2003) (Accepted Dec 15 1997)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW9.91Mean Higher-High Water
MHW9.45Mean High Water
MTL4.90Mean Tide Level
MSL4.93Mean Sea Level
DTL4.95Mean Diurnal Tide Level
MLW0.34Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-8.51Station Datum
GT9.91Great Diurnal Range
MN9.11Mean Range of Tide
DHQ0.46Mean Diurnal High Water Inequality
DLQ0.34Mean Diurnal Low Water Inequality
HWI3.60Greenwich High Water Interval (in hours)
LWI9.76Greenwich Low Water Interval (in hours)
Max Tide14.60Highest Observed Tide
Max Tide Date & Time01/13/2024 22:06Highest Observed Tide Date & Time
Min Tide-3.41Lowest Observed Tide
Min Tide Date & Time11/30/1955 17:18Lowest Observed Tide Date & Time
HAT11.96Highest Astronomical Tide
HAT Date & Time05/19/2034 04:06HAT Date and Time
LAT-2.13Lowest Astronomical Tide
LAT Date & Time01/14/2036 22:42LAT Date and Time
Tidal Datum Analysis Periods
01/01/1960 - 12/31/1978




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