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Datums for 9440083, Vancouver WA


Columbia River Datum Data were collected on Columbia River Datum (CRD), the adopted fixed low water reference plane for this area, therefore Station Datum = CRD for this station. 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.

Elevations on Station Datum

Station: 9440083, Vancouver, WA
Status: Accepted (Jan 19 2012)
Units: Feet
T.M.: 120
Epoch: 1983-2001
Datum: STND
DatumValueDescription
MHHW4.75Mean Higher-High Water
MHW4.21Mean High Water
MTL2.92Mean Tide Level
MSL2.83Mean Sea Level
DTL3.08Mean Diurnal Tide Level
MLW1.64Mean Low Water
MLLW1.41Mean Lower-Low Water
NAVD88
STND0.00Station Datum
GT3.33Great Diurnal Range
MN2.57Mean Range of Tide
DHQ0.54Mean Diurnal High Water Inequality
DLQ0.23Mean Diurnal Low Water Inequality
HWI1.29Greenwich High Water Interval (in hours)
LWI9.20Greenwich 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
HAT7.39Highest Astronomical Tide
HAT Date & Time12/31/1986 00:48HAT Date and Time
LAT-0.69Lowest Astronomical Tide
LAT Date & Time09/24/1985 18:30LAT Date and Time
Tidal Datum Analysis Periods
09/01/2002 - 10/31/2002
08/01/2003 - 10/31/2003
08/01/2004 - 10/31/2004
09/01/2005 - 10/31/2005
09/01/2006 - 10/31/2006
09/01/2007 - 10/31/2007




Products available at 9440083 Vancouver, WA

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