Datums for 8440466, NEWBURYPORT, MERRIMACK RIVER MA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8440466, NEWBURYPORT, MERRIMACK RIVER, MA
Status: Superseded (Apr 17 2003) (Accepted Feb 4 1994)
Units: Feet
Control Station:
T.M.: 75
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW8.76Mean Higher-High Water
MHW8.31Mean High Water
MTL4.28Mean Tide Level
MSL4.27Mean Sea Level
DTL4.38Mean Diurnal Tide Level
MLW0.24Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-4.80Station Datum
GT8.76Great Diurnal Range
MN8.07Mean Range of Tide
DHQ0.45Mean Diurnal High Water Inequality
DLQ0.24Mean Diurnal Low Water Inequality
HWI4.11Greenwich High Water Interval (in hours)
LWI10.65Greenwich Low Water Interval (in hours)
Max Tide10.84Highest Observed Tide
Max Tide Date & Time05/24/1990 23:18Highest Observed Tide Date & Time
Min Tide-1.44Lowest Observed Tide
Min Tide Date & Time12/12/1989 17:42Lowest Observed Tide Date & Time
HAT10.47Highest Astronomical Tide
HAT Date & Time11/16/2016 17:24HAT Date and Time
LAT-1.63Lowest Astronomical Tide
LAT Date & Time11/27/2034 23:48LAT Date and Time
Tidal Datum Analysis Periods




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