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Current Datum Value: 3.33

Datums for 8770971, Rollover Pass TX


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8770971, Rollover Pass, TX
Status: Accepted (Sep 28 2017)
Units: Feet
Control Station: 8771450 Galveston Pier 21, TX
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW1.45Mean Higher-High Water
MHW1.35Mean High Water
MTL0.78Mean Tide Level
MSL0.80Mean Sea Level
DTL0.72Mean Diurnal Tide Level
MLW0.22Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-3.33Station Datum
GT1.45Great Diurnal Range
MN1.13Mean Range of Tide
DHQ0.10Mean Diurnal High Water Inequality
DLQ0.22Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max Tide4.29Highest Observed Tide
Max Tide Date & Time08/27/2017 15:48Highest Observed Tide Date & Time
Min Tide-1.40Lowest Observed Tide
Min Tide Date & Time01/17/2018 19:30Lowest Observed Tide Date & Time
HAT1.90Highest Astronomical Tide
HAT Date & Time05/15/1988 14:24HAT Date and Time
LAT-0.91Lowest Astronomical Tide
LAT Date & Time01/28/1987 18:24LAT Date and Time
Tidal Datum Analysis Periods
02/01/2016 - 11/30/2016




Products available at 8770971 Rollover Pass, TX

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services