NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

On Saturday, June 23rd, 2018 starting at 7:30 a.m to 8 p.m. EDT, there will be a system maintenance performed affecting the Tides and Currents web site (https://tidesandcurrents.noaa.gov). During this time, the Tides and Currents website will be running with limited capabilities. Click here for more information.

Datums for 9457804, Alitak AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9457804, Alitak, AK
Status: Accepted (Dec 9 2011)
Units: Feet
Control Station: 9459450 Sand Point, AK
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW11.67Mean Higher-High Water
MHW10.87Mean High Water
MTL6.22Mean Tide Level
MSL6.14Mean Sea Level
DTL5.84Mean Diurnal Tide Level
MLW1.58Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-5.57Station Datum
GT11.67Great Diurnal Range
MN9.29Mean Range of Tide
DHQ0.80Mean Diurnal High Water Inequality
DLQ1.58Mean Diurnal Low Water Inequality
HWI10.69Greenwich High Water Interval (in hours)
LWI4.63Greenwich Low Water Interval (in hours)
Max Tide10.63Highest Observed Tide
Max Tide Date & Time11/25/2007 22:48Highest Observed Tide Date & Time
Min Tide-10.45Lowest Observed Tide
Min Tide Date & Time12/14/2008 06:00Lowest Observed Tide Date & Time
HAT15.20Highest Astronomical Tide
HAT Date & Time11/13/1985 22:54HAT Date and Time
LAT-3.91Lowest Astronomical Tide
LAT Date & Time07/12/1987 18:12LAT Date and Time
Tidal Datum Analysis Periods
05/01/2007 - 04/30/2008
07/01/2009 - 06/30/2011




Products available at 9457804 Alitak, AK

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services