Datums for 9450831, Hyder


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9450831, Hyder
Status: Accepted (Jan 30 2023)
Units: Feet
Control Station: 9450460 Ketchikan, AK
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW16.50Mean Higher-High Water
MHW15.55Mean High Water
MTL8.57Mean Tide Level
MSL8.55Mean Sea Level
DTL8.25Mean Diurnal Tide Level
MLW1.58Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD883.61North American Vertical Datum of 1988
STND-37.30Station Datum
GT16.50Great Diurnal Range
MN13.97Mean Range of Tide
DHQ0.95Mean Diurnal High Water Inequality
DLQ1.59Mean Diurnal Low Water Inequality
HWI9.36Greenwich High Water Interval (in hours)
LWI3.09Greenwich 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
HAT21.26Highest Astronomical Tide
HAT Date & Time11/15/2016 21:36HAT Date and Time
LAT-4.81Lowest Astronomical Tide
LAT Date & Time05/27/2021 16:06LAT Date and Time
Tidal Datum Analysis Periods
07/01/2022 - 09/30/2022




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