Datums for 8772447, Freeport TX


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8772447, Freeport, TX
Status: Accepted (Apr 13 2020)
Units: Feet
Control Station: 8771450 Galveston Pier 21, TX
T.M.: 90
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW1.64Mean Higher-High Water
MHW1.50Mean High Water
MTL0.88Mean Tide Level
MSL0.90Mean Sea Level
DTL0.82Mean Diurnal Tide Level
MLW0.25Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD880.60North American Vertical Datum of 1988
STND-27.63Station Datum
GT1.65Great Diurnal Range
MN1.25Mean Range of Tide
DHQ0.14Mean Diurnal High Water Inequality
DLQ0.26Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max Tide7.40Highest Observed Tide
Max Tide Date & Time09/12/2008 18:42Highest Observed Tide Date & Time
Min Tide-2.70Lowest Observed Tide
Min Tide Date & Time03/22/2010 06:30Lowest Observed Tide Date & Time
HAT2.50Highest Astronomical Tide
HAT Date & Time10/29/2007 01:00HAT Date and Time
LAT-1.33Lowest Astronomical Tide
LAT Date & Time01/21/2023 14:12LAT Date and Time
Tidal Datum Analysis Periods
12/01/2006 - 11/30/2007
10/01/2008 - 09/30/2014
02/01/2015 - 01/31/2018




Products available at 8772447 Freeport, TX