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Datums for 9439040, Astoria OR


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9439040, Astoria, OR
Status: Accepted (Apr 17 2003)
Units: Feet
Control Station:
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW8.61Mean Higher-High Water
MHW7.94Mean High Water
MTL4.55Mean Tide Level
MSL4.51Mean Sea Level
DTL4.31Mean Diurnal Tide Level
MLW1.17Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88-0.21North American Vertical Datum of 1988
STND-2.23Station Datum
GT8.61Great Diurnal Range
MN6.76Mean Range of Tide
DHQ0.68Mean Diurnal High Water Inequality
DLQ1.16Mean Diurnal Low Water Inequality
HWI9.16Greenwich High Water Interval (in hours)
LWI2.97Greenwich Low Water Interval (in hours)
Max Tide12.37Highest Observed Tide
Max Tide Date & Time01/27/1983 11:24Highest Observed Tide Date & Time
Min Tide-3.85Lowest Observed Tide
Min Tide Date & Time01/28/1979 20:18Lowest Observed Tide Date & Time
HAT10.57Highest Astronomical Tide
HAT Date & Time12/11/1985 20:00HAT Date and Time
LAT-2.00Lowest Astronomical Tide
LAT Date & Time06/22/1986 15:42LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001
To refer water level heights to NAVD88 (North American Vertical Datum of 1988), apply the values located at National Geodetic Survey.




Products available at 9439040 Astoria, OR

Revised: 08/08/2018
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Web site owner: Center for Operational Oceanographic Products and Services