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Current Datum Value: 8.19

Datums for 8459681, Block Island RI


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8459681, Block Island, RI
Status: Accepted (May 1 2003)
Units: Feet
Control Station: 8452660 Newport, RI
T.M.: 75
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW2.96Mean Higher-High Water
MHW2.71Mean High Water
MTL1.42Mean Tide Level
MSL1.38Mean Sea Level
DTL1.48Mean Diurnal Tide Level
MLW0.12Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-8.19Station Datum
GT2.95Great Diurnal Range
MN2.60Mean Range of Tide
DHQ0.24Mean Diurnal High Water Inequality
DLQ0.12Mean Diurnal Low Water Inequality
HWI0.35Greenwich High Water Interval (in hours)
LWI6.61Greenwich 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
HAT3.98Highest Astronomical Tide
HAT Date & Time10/16/1993 12:48HAT Date and Time
LAT-0.83Lowest Astronomical Tide
LAT Date & Time03/09/1993 07:06LAT Date and Time
Tidal Datum Analysis Periods
05/01/1998 - 10/31/1998




Products available at 8459681 Block Island, RI

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services