Datums for 9457313, PORT WILLIAM, SHUYAK ISLAND AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9457313, PORT WILLIAM, SHUYAK ISLAND, AK
Status: Accepted (May 16 2025)
Units: Feet
Control Station: 9455500 Seldovia, AK
T.M.: 0
Epoch: 2012-2016
Datum: MLLW
DatumValueDescription
MHHW13.93Mean Higher-High Water
MHW13.06Mean High Water
MTL7.34Mean Tide Level
MSL7.34Mean Sea Level
DTL6.97Mean Diurnal Tide Level
MLW1.62Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD883.05North American Vertical Datum of 1988
STND-14.13Station Datum
GT13.93Great Diurnal Range
MN11.44Mean Range of Tide
DHQ0.87Mean Diurnal High Water Inequality
DLQ1.61Mean Diurnal Low Water Inequality
HWI11.25Greenwich High Water Interval (in hours)
LWI4.99Greenwich 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
HATHighest Astronomical Tide
HAT Date & Time HAT Date and Time
LATLowest Astronomical Tide
LAT Date & Time LAT Date and Time
Tidal Datum Analysis Periods
05/01/2024 - 07/31/2024




Products available at 9457313 PORT WILLIAM, SHUYAK ISLAND, AK