Datums for 9469031, Koyuk AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9469031, Koyuk, AK
Status: Accepted (Jan 5 2021)
Units: Feet
Control Station: 9468333 Unalakleet, AK
T.M.: 135
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW2.97Mean Higher-High Water
MHW2.74Mean High Water
MTL1.49Mean Tide Level
MSL1.36Mean Sea Level
DTL1.49Mean Diurnal Tide Level
MLW0.24Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88-2.75North American Vertical Datum of 1988
STND-22.02Station Datum
GT2.97Great Diurnal Range
MN2.50Mean Range of Tide
DHQ0.23Mean Diurnal High Water Inequality
DLQ0.24Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich 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
HAT5.72Highest Astronomical Tide
HAT Date & Time06/17/2026 23:48HAT Date and Time
LAT-2.69Lowest Astronomical Tide
LAT Date & Time12/08/2025 21:24LAT Date and Time
Tidal Datum Analysis Periods
08/14/2020 - 09/12/2020




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