Datums for 8761720, GRAND ISLE


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8761720, GRAND ISLE
Status: Superseded (Apr 17 2003) (Accepted Feb 4 1994)
Units: Feet
Control Station:
T.M.: 90
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW1.11Mean Higher-High Water
MHW1.09Mean High Water
MTL0.56Mean Tide Level
MSL0.56Mean Sea Level
DTL0.56Mean Diurnal Tide Level
MLW0.03Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-5.45Station Datum
GT1.11Great Diurnal Range
MN1.06Mean Range of Tide
DHQ0.02Mean Diurnal High Water Inequality
DLQ0.03Mean 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
HAT1.91Highest Astronomical Tide
HAT Date & Time10/12/2025 07:18HAT Date and Time
LAT-0.95Lowest Astronomical Tide
LAT Date & Time01/09/2005 13:54LAT Date and Time
Tidal Datum Analysis Periods




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