Datums for 9439221, Portland Morrison Street Bridge OR


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9439221, Portland Morrison Street Bridge, OR
Status: Accepted (Feb 2 2012)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW3.62Mean Higher-High Water
MHW3.11Mean High Water
MTL1.68Mean Tide Level
MSL1.52Mean Sea Level
DTL1.81Mean Diurnal Tide Level
MLW0.25Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88-7.03North American Vertical Datum of 1988
STND-1.65Station Datum
GT3.62Great Diurnal Range
MN2.85Mean Range of Tide
DHQ0.51Mean Diurnal High Water Inequality
DLQ0.25Mean Diurnal Low Water Inequality
HWI1.10Greenwich High Water Interval (in hours)
LWI9.51Greenwich 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
HAT6.60Highest Astronomical Tide
HAT Date & Time05/25/1994 12:18HAT Date and Time
LAT-2.09Lowest Astronomical Tide
LAT Date & Time09/09/2000 18:24LAT Date and Time
Tidal Datum Analysis Periods
09/01/2002 - 10/31/2002
08/01/2005 - 10/31/2005




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