Datums for 8419870, Seavey Island ME


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8419870, Seavey Island, ME
Status: Accepted (Dec 6 2021)
Units: Feet
Control Station: 8418150 Portland, ME
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW8.89Mean Higher-High Water
MHW8.47Mean High Water
MTL4.39Mean Tide Level
MSL4.46Mean Sea Level
DTL4.45Mean Diurnal Tide Level
MLW0.32Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD884.71North American Vertical Datum of 1988
STND-2.27Station Datum
GT8.89Great Diurnal Range
MN8.16Mean Range of Tide
DHQ0.42Mean Diurnal High Water Inequality
DLQ0.31Mean Diurnal Low Water Inequality
HWI3.92Greenwich High Water Interval (in hours)
LWI10.04Greenwich Low Water Interval (in hours)
Max Tide12.60Highest Observed Tide
Max Tide Date & Time02/07/1978 10:42Highest Observed Tide Date & Time
Min Tide-3.27Lowest Observed Tide
Min Tide Date & Time11/30/1955 00:00Lowest Observed Tide Date & Time
HAT10.58Highest Astronomical Tide
HAT Date & Time11/15/2016 16:18HAT Date and Time
LAT-1.80Lowest Astronomical Tide
LAT Date & Time01/14/2036 23:00LAT Date and Time
Tidal Datum Analysis Periods
07/01/2020 - 06/30/2021




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