Datums for 8729747, SHIELD POINT, BLACKWATER RIVER


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8729747, SHIELD POINT, BLACKWATER RIVER
Status: Superseded (Apr 17 2003) (Accepted Feb 4 1994)
Units: Feet
Control Station:
T.M.: 90
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW1.55Mean Higher-High Water
MHW1.47Mean High Water
MTL0.80Mean Tide Level
MSL0.80Mean Sea Level
DTL0.78Mean Diurnal Tide Level
MLW0.12Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-2.12Station Datum
GT1.55Great Diurnal Range
MN1.35Mean Range of Tide
DHQ0.08Mean Diurnal High Water Inequality
DLQ0.12Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich 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
HAT2.40Highest Astronomical Tide
HAT Date & Time10/11/2025 07:00HAT Date and Time
LAT-1.13Lowest Astronomical Tide
LAT Date & Time01/10/2005 15:42LAT Date and Time
Tidal Datum Analysis Periods




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