Datums for 9451012, Bradfield Canal AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9451012, Bradfield Canal, AK
Status: Accepted (Mar 23 2026)
Units: Feet
Control Station: 9450460 Ketchikan, AK
T.M.: 135
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW16.56Mean Higher-High Water
MHW15.63Mean High Water
MTL8.59Mean Tide Level
MSL8.53Mean Sea Level
DTL8.28Mean Diurnal Tide Level
MLW1.56Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD883.72North American Vertical Datum of 1988
STND5.32Station Datum
GT16.57Great Diurnal Range
MN14.08Mean Range of Tide
DHQ0.93Mean Diurnal High Water Inequality
DLQ1.57Mean Diurnal Low Water Inequality
HWI9.59Greenwich High Water Interval (in hours)
LWI3.17Greenwich 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
HAT20.64Highest Astronomical Tide
HAT Date & Time11/15/2020 21:24HAT Date and Time
LAT-4.79Lowest Astronomical Tide
LAT Date & Time11/25/2003 04:00LAT Date and Time
Tidal Datum Analysis Periods
05/01/2025 - 08/31/2025




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