Datums for 9459450, Sand Point AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9459450, Sand Point, AK
Status: Superseded (Apr 17 2003) (Accepted Nov 21 1997)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW7.21Mean Higher-High Water
MHW6.51Mean High Water
MTL3.91Mean Tide Level
MSL3.84Mean Sea Level
DTL3.61Mean Diurnal Tide Level
MLW1.31Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-30.69Station Datum
GT7.21Great Diurnal Range
MN5.20Mean Range of Tide
DHQ0.70Mean Diurnal High Water Inequality
DLQ1.31Mean Diurnal Low Water Inequality
HWI11.27Greenwich High Water Interval (in hours)
LWI4.96Greenwich Low Water Interval (in hours)
Max Tide11.68Highest Observed Tide
Max Tide Date & Time12/23/2022 02:36Highest Observed Tide Date & Time
Min Tide-3.99Lowest Observed Tide
Min Tide Date & Time12/13/2008 05:24Lowest Observed Tide Date & Time
HAT9.57Highest Astronomical Tide
HAT Date & Time12/05/2025 22:36HAT Date and Time
LAT-2.95Lowest Astronomical Tide
LAT Date & Time06/15/2022 18:06LAT Date and Time
Tidal Datum Analysis Periods
01/01/1981 - 12/31/1990




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