Datums for 9440747, NAHCOTTA, WILLAPA BAY WA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9440747, NAHCOTTA, WILLAPA BAY, WA
Status: Accepted (May 25 2004)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW10.49Mean Higher-High Water
MHW9.74Mean High Water
MTL5.59Mean Tide Level
MSL5.81Mean Sea Level
DTL5.25Mean Diurnal Tide Level
MLW1.46Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-0.73Station Datum
GT10.49Great Diurnal Range
MN8.28Mean Range of Tide
DHQ0.76Mean Diurnal High Water Inequality
DLQ1.46Mean Diurnal Low Water Inequality
HWI9.32Greenwich High Water Interval (in hours)
LWI2.95Greenwich 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
HAT12.76Highest Astronomical Tide
HAT Date & Time11/13/1985 21:18HAT Date and Time
LAT-2.85Lowest Astronomical Tide
LAT Date & Time12/24/1999 04:06LAT Date and Time
Tidal Datum Analysis Periods
05/12/1982 - 06/11/1982




Products available at 9440747 NAHCOTTA, WILLAPA BAY, WA