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Datums for 9450460, Ketchikan AK


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9450460, Ketchikan, AK
Status: Accepted (Sep 26 2011)
Units: Feet
T.M.: 135
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW15.45Mean Higher-High Water
MHW14.55Mean High Water
MTL8.06Mean Tide Level
MSL8.07Mean Sea Level
DTL7.72Mean Diurnal Tide Level
MLW1.57Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-6.19Station Datum
GT15.45Great Diurnal Range
MN12.97Mean Range of Tide
DHQ0.91Mean Diurnal High Water Inequality
DLQ1.57Mean Diurnal Low Water Inequality
HWI9.41Greenwich High Water Interval (in hours)
LWI3.10Greenwich Low Water Interval (in hours)
Max Tide27.50Highest Observed Tide
Max Tide Date & Time12/02/1967 22:24Highest Observed Tide Date & Time
Min Tide0.93Lowest Observed Tide
Min Tide Date & Time12/14/2008 04:18Lowest Observed Tide Date & Time
HAT19.72Highest Astronomical Tide
HAT Date & Time12/03/1994 21:18HAT Date and Time
LAT-4.55Lowest Astronomical Tide
LAT Date & Time07/03/2000 16:42LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001




Products available at 9450460 Ketchikan, AK

Revised: 10/15/2013
NOAA / National Ocean Service
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