Datums for 8418150, Portland ME


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8418150, Portland, ME
Status: Accepted (Apr 17 2003)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW9.91Mean Higher-High Water
MHW9.47Mean High Water
MTL4.91Mean Tide Level
MSL4.94Mean Sea Level
DTL4.96Mean Diurnal Tide Level
MLW0.35Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD885.26North American Vertical Datum of 1988
STND-8.55Station Datum
GT9.90Great Diurnal Range
MN9.12Mean Range of Tide
DHQ0.44Mean Diurnal High Water Inequality
DLQ0.34Mean Diurnal Low Water Inequality
HWI3.59Greenwich High Water Interval (in hours)
LWI9.75Greenwich Low Water Interval (in hours)
Max Tide14.13Highest Observed Tide
Max Tide Date & Time02/07/1978 10:30Highest Observed Tide Date & Time
Min Tide-3.45Lowest Observed Tide
Min Tide Date & Time11/30/1955 17:18Lowest Observed Tide Date & Time
HAT11.95Highest Astronomical Tide
HAT Date & Time05/17/1999 04:42HAT Date and Time
LAT-2.12Lowest Astronomical Tide
LAT Date & Time12/23/1999 22:18LAT Date and Time
Tidal Datum Analysis Periods
01/01/1983 - 12/31/2001




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