Notice: CO-OPS recently determined that water level data from Vancouver (9440083) contained an error due to the conversion of pressure to water level in our database. This error resulted in water level measurements several centimeters higher than actual. Impacted water level products from March 27, 2002 to August 4, 2021 have now been corrected, including 6-minute water level data, hourly heights, highs/lows, monthly means, and tidal datums. Any data products downloaded from this time will need to be re-downloaded. Water level products from August 4, 2021 to present, including real-time data, were not impacted. If you have any questions, please send an email to and we will get back to you as soon as possible.

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.
NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9440083, Vancouver, WA
Status: Accepted (Apr 3 2024)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
MHHW3.18Mean Higher-High Water
MHW2.65Mean High Water
MTL1.43Mean Tide Level
MSL1.34Mean Sea Level
DTL1.59Mean Diurnal Tide Level
MLW0.22Mean Low Water
MLLW0.00Mean Lower-Low Water
CRD_OFFSET-1.81Columbia River Datum Offset
STND-1.65Station Datum
GT3.17Great Diurnal Range
MN2.42Mean Range of Tide
DHQ0.53Mean Diurnal High Water Inequality
DLQ0.22Mean Diurnal Low Water Inequality
HWI1.32Greenwich High Water Interval (in hours)
LWI9.28Greenwich Low Water Interval (in hours)
Max Tide15.49Highest Observed Tide
Max Tide Date & Time03/28/2017 06:30Highest Observed Tide Date & Time
Min Tide-2.38Lowest Observed Tide
Min Tide Date & Time09/28/2009 21:18Lowest Observed Tide Date & Time
HAT3.83Highest Astronomical Tide
HAT Date & Time12/23/2003 00:42HAT Date and Time
LAT-0.66Lowest Astronomical Tide
LAT Date & Time09/01/2027 21:36LAT 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