Datums for 9447130, Seattle WA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9447130, Seattle, WA
Status: Superseded (Apr 17 2003) (Accepted Jun 14 1996)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW11.35Mean Higher-High Water
MHW10.49Mean High Water
MTL6.66Mean Tide Level
MSL6.63Mean Sea Level
DTL5.67Mean Diurnal Tide Level
MLW2.83Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-7.77Station Datum
GT11.35Great Diurnal Range
MN7.66Mean Range of Tide
DHQ0.86Mean Diurnal High Water Inequality
DLQ2.83Mean Diurnal Low Water Inequality
HWI0.42Greenwich High Water Interval (in hours)
LWI6.65Greenwich Low Water Interval (in hours)
Max Tide15.29Highest Observed Tide
Max Tide Date & Time12/27/2022 21:42Highest Observed Tide Date & Time
Min Tide-4.87Lowest Observed Tide
Min Tide Date & Time01/04/1916 00:00Lowest Observed Tide Date & Time
HAT13.30Highest Astronomical Tide
HAT Date & Time01/16/2032 15:42HAT Date and Time
LAT-4.32Lowest Astronomical Tide
LAT Date & Time06/15/2026 18:36LAT Date and Time
Tidal Datum Analysis Periods
01/01/1960 - 12/31/1978




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