Datums for 8772479, Freeport Entrance Jetty


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8772479, Freeport Entrance Jetty
Status: Accepted (Dec 31 2020)
Units: Feet
Control Station: 8772471 Freeport Harbor, TX
T.M.: 90
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW1.71Mean Higher-High Water
MHW1.57Mean High Water
MTL0.89Mean Tide Level
MSL0.92Mean Sea Level
DTL0.85Mean Diurnal Tide Level
MLW0.22Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD880.36North American Vertical Datum of 1988
STND-22.54Station Datum
GT1.71Great Diurnal Range
MN1.35Mean Range of Tide
DHQ0.14Mean Diurnal High Water Inequality
DLQ0.22Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max TideHighest Observed Tide
Max Tide Date & Time Highest Observed Tide Date & Time
Min TideLowest Observed Tide
Min Tide Date & Time Lowest Observed Tide Date & Time
HAT2.54Highest Astronomical Tide
HAT Date & Time05/18/2026 12:00HAT Date and Time
LAT-1.32Lowest Astronomical Tide
LAT Date & Time01/10/2005 14:24LAT Date and Time
Tidal Datum Analysis Periods
11/01/2019 - 05/31/2020




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