Datums for 8441551, ROCKPORT HARBOR MA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8441551, ROCKPORT HARBOR, MA
Status: Superseded (Apr 17 2003) (Accepted Feb 24 2000)
Units: Feet
Control Station: 8443970 Boston, MA
T.M.: 75
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW9.51Mean Higher-High Water
MHW9.08Mean High Water
MTL4.71Mean Tide Level
MSL4.73Mean Sea Level
DTL4.76Mean Diurnal Tide Level
MLW0.33Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-3.16Station Datum
GT9.51Great Diurnal Range
MN8.76Mean Range of Tide
DHQ0.43Mean Diurnal High Water Inequality
DLQ0.33Mean Diurnal Low Water Inequality
HWI3.65Greenwich High Water Interval (in hours)
LWI9.82Greenwich 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
HAT11.53Highest Astronomical Tide
HAT Date & Time11/16/2016 17:00HAT Date and Time
LAT-2.03Lowest Astronomical Tide
LAT Date & Time11/27/2034 23:06LAT Date and Time
Tidal Datum Analysis Periods
08/01/1992 - 09/30/1992




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