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Current Datum Value: 4.56

Datums for 9440575, KNAPPTON WA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9440575, KNAPPTON, WA
Status: Accepted (May 17 2004)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW8.69Mean Higher-High Water
MHW8.00Mean High Water
MTL4.61Mean Tide Level
MSL4.59Mean Sea Level
DTL4.34Mean Diurnal Tide Level
MLW1.21Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-4.56Station Datum
GT8.69Great Diurnal Range
MN6.78Mean Range of Tide
DHQ0.69Mean Diurnal High Water Inequality
DLQ1.22Mean Diurnal Low Water Inequality
HWI9.22Greenwich High Water Interval (in hours)
LWI2.84Greenwich 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
HATHighest Astronomical Tide
HAT Date & Time HAT Date and Time
LATLowest Astronomical Tide
LAT Date & Time LAT Date and Time
Tidal Datum Analysis Periods
09/01/1981 - 09/30/1981




Products available at 9440575 KNAPPTON, WA

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services