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Datums for 9451054, Port Alexander AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9451054, Port Alexander, AK
Status: Accepted (Sep 7 2018)
Units: Feet
Control Station: 9451600 Sitka, AK
T.M.: 135
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW10.93Mean Higher-High Water
MHW10.08Mean High Water
MTL5.76Mean Tide Level
MSL5.73Mean Sea Level
DTL5.47Mean Diurnal Tide Level
MLW1.45Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD881.18North American Vertical Datum of 1988
STND-3.76Station Datum
GT10.92Great Diurnal Range
MN8.63Mean Range of Tide
DHQ0.85Mean Diurnal High Water Inequality
DLQ1.44Mean Diurnal Low Water Inequality
HWI9.60Greenwich High Water Interval (in hours)
LWI3.34Greenwich Low Water Interval (in hours)
Max Tide14.93Highest Observed Tide
Max Tide Date & Time12/23/2007 20:30Highest Observed Tide Date & Time
Min Tide-4.29Lowest Observed Tide
Min Tide Date & Time12/14/2008 04:30Lowest Observed Tide Date & Time
HAT14.03Highest Astronomical Tide
HAT Date & Time12/23/1999 21:42HAT Date and Time
LAT-3.44Lowest Astronomical Tide
LAT Date & Time05/25/1990 16:18LAT Date and Time
Tidal Datum Analysis Periods
09/01/2007 - 08/31/2008
06/01/2009 - 05/31/2017




Products available at 9451054 Port Alexander, AK

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