Datums for 8772471, Freeport SPIP, Freeport Harbor TX


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8772471, Freeport SPIP, Freeport Harbor, TX
Status: Accepted (Mar 24 2021)
Units: Feet
Control Station: 8771450 Galveston Pier 21, TX
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW1.67Mean Higher-High Water
MHW1.53Mean High Water
MTL0.91Mean Tide Level
MSL0.91Mean Sea Level
DTL0.83Mean Diurnal Tide Level
MLW0.28Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD880.65North American Vertical Datum of 1988
STND-27.35Station Datum
GT1.67Great Diurnal Range
MN1.25Mean Range of Tide
DHQ0.14Mean Diurnal High Water Inequality
DLQ0.28Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max Tide5.56Highest Observed Tide
Max Tide Date & Time08/27/2020 11:24Highest Observed Tide Date & Time
Min Tide-2.32Lowest Observed Tide
Min Tide Date & Time12/21/2018 13:42Lowest Observed Tide Date & Time
HATHighest Astronomical Tide
HAT Date & Time HAT Date and Time
LATLowest Astronomical Tide
LAT Date & Time LAT Date and Time
Tidal Datum Analysis Periods
07/01/2016 - 06/30/2018
01/01/2019 - 12/31/2019




Products available at 8772471 Freeport SPIP, Freeport Harbor, TX