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: Accepted (Apr 17 2003)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
MHHW11.36Mean Higher-High Water
MHW10.49Mean High Water
MTL6.66Mean Tide Level
MSL6.64Mean Sea Level
DTL5.68Mean Diurnal Tide Level
MLW2.83Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD882.34North American Vertical Datum of 1988
STND-7.94Station Datum
GT11.36Great Diurnal Range
MN7.66Mean Range of Tide
DHQ0.87Mean Diurnal High Water Inequality
DLQ2.84Mean Diurnal Low Water Inequality
HWI0.40Greenwich High Water Interval (in hours)
LWI6.64Greenwich Low Water Interval (in hours)
Max Tide15.12Highest Observed Tide
Max Tide Date & Time12/27/2022 21:42Highest Observed Tide Date & Time
Min Tide-5.04Lowest 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-4.31Lowest Astronomical Tide
LAT Date & Time06/15/2026 18:36LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001

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