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Datums for 9439099, Wauna OR


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: 9439099, Wauna, OR
Status: Accepted (Jun 12 2017)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW6.99Mean Higher-High Water
MHW6.39Mean High Water
MTL3.53Mean Tide Level
MSL3.40Mean Sea Level
DTL3.49Mean Diurnal Tide Level
MLW0.67Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-1.00Station Datum
GT6.99Great Diurnal Range
MN5.72Mean Range of Tide
DHQ0.60Mean Diurnal High Water Inequality
DLQ0.67Mean Diurnal Low Water Inequality
HWI10.22Greenwich High Water Interval (in hours)
LWI4.76Greenwich Low Water Interval (in hours)
Max TideHighest Observed Tide
Max Tide Date & Time Highest Observed Tide Date & Time
Min TideLowest Observed Tide
Min Tide Date & Time Lowest Observed Tide Date & Time
HAT9.36Highest Astronomical Tide
HAT Date & Time05/25/1986 10:24HAT Date and Time
LAT-1.34Lowest Astronomical Tide
LAT Date & Time01/20/1988 06:00LAT Date and Time
Tidal Datum Analysis Periods
08/01/2002 - 10/31/2002
07/01/2004 - 10/31/2004
08/01/2005 - 10/31/2005
08/01/2006 - 10/31/2006
08/01/2007 - 11/30/2007
09/01/2008 - 10/31/2008
07/01/2009 - 10/31/2009
07/01/2010 - 10/31/2010
08/01/2011 - 10/31/2011
09/01/2012 - 10/31/2012




Products available at 9439099 Wauna, OR

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