Datums for 8724397, JOHNSTON KEY FL


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8724397, JOHNSTON KEY, FL
Status: Accepted (Aug 1 2003)
Units: Feet
Control Station: 8724580 Key West, FL
T.M.: 75
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW1.98Mean Higher-High Water
MHW1.69Mean High Water
MTL0.91Mean Tide Level
MSL0.80Mean Sea Level
DTL1.00Mean Diurnal Tide Level
MLW0.13Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-3.30Station Datum
GT1.98Great Diurnal Range
MN1.56Mean Range of Tide
DHQ0.30Mean Diurnal High Water Inequality
DLQ0.12Mean Diurnal Low Water Inequality
HWI6.19Greenwich High Water Interval (in hours)
LWI1.60Greenwich 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
HATHighest Astronomical Tide
HAT Date & Time HAT Date and Time
LATLowest Astronomical Tide
LAT Date & Time LAT Date and Time
Tidal Datum Analysis Periods
12/01/1973 - 02/28/1974
To refer water level heights to NAVD88 (North American Vertical Datum of 1988), apply the values located at National Geodetic Survey.




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