Datums for 9451798, PORT HOUGHTON (INSIDE), STEPHENS PASSAGE AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9451798, PORT HOUGHTON (INSIDE), STEPHENS PASSAGE, AK
Status: Accepted (May 20 2025)
Units: Feet
Control Station: 9452210 Juneau, AK
T.M.: 135
Epoch: 2012-2016
Datum: MLLW
DatumValueDescription
MHHW15.19Mean Higher-High Water
MHW14.26Mean High Water
MTL7.90Mean Tide Level
MSL7.99Mean Sea Level
DTL7.60Mean Diurnal Tide Level
MLW1.54Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD883.01North American Vertical Datum of 1988
STND-14.12Station Datum
GT15.19Great Diurnal Range
MN12.71Mean Range of Tide
DHQ0.94Mean Diurnal High Water Inequality
DLQ1.54Mean Diurnal Low Water Inequality
HWI9.73Greenwich High Water Interval (in hours)
LWI3.47Greenwich 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
HAT19.17Highest Astronomical Tide
HAT Date & Time11/15/2016 22:00HAT Date and Time
LAT-4.75Lowest Astronomical Tide
LAT Date & Time11/25/2003 04:18LAT Date and Time
Tidal Datum Analysis Periods
06/01/2024 - 08/31/2024




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