Datums for 8575512, Annapolis MD


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8575512, Annapolis, MD
Status: Superseded (Apr 17 2003) (Accepted Mar 16 1998)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW1.42Mean Higher-High Water
MHW1.16Mean High Water
MTL0.70Mean Tide Level
MSL0.72Mean Sea Level
DTL0.71Mean Diurnal Tide Level
MLW0.23Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-4.30Station Datum
GT1.43Great Diurnal Range
MN0.93Mean Range of Tide
DHQ0.26Mean Diurnal High Water Inequality
DLQ0.24Mean Diurnal Low Water Inequality
HWI10.06Greenwich High Water Interval (in hours)
LWI3.97Greenwich Low Water Interval (in hours)
Max Tide7.38Highest Observed Tide
Max Tide Date & Time09/19/2003 11:54Highest Observed Tide Date & Time
Min Tide-3.70Lowest Observed Tide
Min Tide Date & Time12/31/1962 20:12Lowest Observed Tide Date & Time
HAT1.91Highest Astronomical Tide
HAT Date & Time07/13/2022 09:42HAT Date and Time
LAT-0.72Lowest Astronomical Tide
LAT Date & Time01/22/2023 16:06LAT Date and Time
Tidal Datum Analysis Periods
01/01/1960 - 12/31/1968
01/01/1970 - 12/31/1975
01/01/1977 - 12/31/1978




Products available at 8575512 Annapolis, MD