Datums for 9440357, TEMCO Kalama Terminal 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: 9440357, TEMCO Kalama Terminal, WA
Status: Accepted (Feb 9 2017)
Units: Feet
Control Station: 9439040 Astoria, OR
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW3.63Mean Higher-High Water
MHW3.17Mean High Water
MTL1.73Mean Tide Level
MSL1.67Mean Sea Level
DTL1.82Mean Diurnal Tide Level
MLW0.30Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-8.02Station Datum
GT3.62Great Diurnal Range
MN2.87Mean Range of Tide
DHQ0.46Mean Diurnal High Water Inequality
DLQ0.29Mean Diurnal Low Water Inequality
HWI11.72Greenwich High Water Interval (in hours)
LWI7.26Greenwich 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
HAT4.63Highest Astronomical Tide
HAT Date & Time12/04/2021 23:48HAT Date and Time
LAT-0.88Lowest Astronomical Tide
LAT Date & Time01/03/2018 08:00LAT Date and Time
Tidal Datum Analysis Periods
08/01/2016 - 10/31/2016




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