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Datums for 9440083, Vancouver WA


Columbia River Datum Columbia River Datum (CRD) is the adopted fixed low water reference plane for this area. CRD is a U.S. Army Corps of Engineers non-tidal datum defined at distinct river miles relative to NAVD88, and is used as chart datum above river mile 23 on the Columbia River. Datums are computed using observations from the low river stages of the year, generally August through October due to the masking of the tidal signal from strong seasonal river runoff during other portions of the year. Depending on river flow, water levels can be significantly higher than Columbia River Datum. As of 2014, the U.S. Army Corps of Engineers provided updated offsets for CRD that have been applied to this station. Station Datum (STND) is no longer set equal to CRD.

Elevations on Station Datum

Station: 9440083, Vancouver, WA
Status: Accepted (Jun 16 2017)
Units: Feet
T.M.: 0
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW4.97Mean Higher-High Water
MHW4.44Mean High Water
MTL3.22Mean Tide Level
MSL3.13Mean Sea Level
DTL3.38Mean Diurnal Tide Level
MLW2.00Mean Low Water
MLLW1.78Mean Lower-Low Water
NAVD88
STND0.00Station Datum
GT3.19Great Diurnal Range
MN2.43Mean Range of Tide
DHQ0.54Mean Diurnal High Water Inequality
DLQ0.22Mean Diurnal Low Water Inequality
HWI1.32Greenwich High Water Interval (in hours)
LWI9.27Greenwich Low Water Interval (in hours)
MaximumHighest Observed Water Level
Max Date & Time Highest Observed Water Level Date and Time
MinimumLowest Observed Water Level
Min Date & Time Lowest Observed Water Level Date and Time
HAT7.70Highest Astronomical Tide
HAT Date & Time12/31/1986 00:48HAT Date and Time
LAT-0.38Lowest Astronomical Tide
LAT Date & Time09/24/1985 18:30LAT Date and Time
Tidal Datum Analysis Periods
08/01/2002 - 11/30/2002
07/01/2003 - 11/30/2003
08/01/2004 - 11/30/2004
08/01/2005 - 10/31/2005
08/01/2006 - 10/31/2006
08/01/2007 - 11/30/2007
08/01/2008 - 10/31/2008
08/01/2009 - 10/31/2009
08/01/2010 - 10/31/2010
09/01/2011 - 12/31/2011




Products available at 9440083 Vancouver, WA

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