NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Datums for 9446484, Tacoma WA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9446484, Tacoma, WA
Status: Accepted (Sep 19 2017)
Units: Feet
Control Station: 9447130 Seattle, WA
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW11.78Mean Higher-High Water
MHW10.90Mean High Water
MTL6.87Mean Tide Level
MSL6.84Mean Sea Level
DTL5.89Mean Diurnal Tide Level
MLW2.84Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD882.39North American Vertical Datum of 1988
STND-0.62Station Datum
GT11.77Great Diurnal Range
MN8.06Mean Range of Tide
DHQ0.87Mean Diurnal High Water Inequality
DLQ2.84Mean Diurnal Low Water Inequality
HWI0.47Greenwich High Water Interval (in hours)
LWI6.71Greenwich Low Water Interval (in hours)
Max Tide14.87Highest Observed Tide
Max Tide Date & Time12/17/2012 16:12Highest Observed Tide Date & Time
Min Tide-4.73Lowest Observed Tide
Min Tide Date & Time11/26/2007 07:06Lowest Observed Tide Date & Time
HAT13.78Highest Astronomical Tide
HAT Date & Time01/23/1992 15:36HAT Date and Time
LAT-4.35Lowest Astronomical Tide
LAT Date & Time06/22/1986 18:36LAT Date and Time
Tidal Datum Analysis Periods
01/01/1999 - 12/31/2016




Products available at 9446484 Tacoma, WA

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services