Datums for 9451561, Thomas Bay AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9451561, Thomas Bay, AK
Status: Accepted (May 19 2025)
Units: Feet
Control Station: 9452210 Juneau, AK
T.M.: 0
Epoch: 2012-2016
Datum: MLLW
DatumValueDescription
MHHW15.62Mean Higher-High Water
MHW14.69Mean High Water
MTL8.13Mean Tide Level
MSL8.23Mean Sea Level
DTL7.81Mean Diurnal Tide Level
MLW1.56Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD883.07North American Vertical Datum of 1988
STND-13.55Station Datum
GT15.62Great Diurnal Range
MN13.13Mean Range of Tide
DHQ0.93Mean Diurnal High Water Inequality
DLQ1.56Mean Diurnal Low Water Inequality
HWI9.82Greenwich High Water Interval (in hours)
LWI3.57Greenwich 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
HAT19.96Highest Astronomical Tide
HAT Date & Time11/15/2016 22:06HAT Date and Time
LAT-4.73Lowest Astronomical Tide
LAT Date & Time05/27/2021 16:36LAT Date and Time
Tidal Datum Analysis Periods
05/01/2024 - 08/31/2024




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