Datums for 8637712, Jamestown VA

NOTICE: Data collected from 2017 and beyond are from United States Geological Survey (USGS) water level stations that are subject to NOAA's National Ocean Service (NOS) routine quality assurance procedures on a monthly basis with data available for the previous month. For access to the real-time data at this location visit USGS at: https://nwis.waterdata.usgs.gov/nwis/uv?site_no=02042770.
NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8637712, Jamestown, VA
Status: Accepted (Jul 05 2022)
Units: Feet
Control Station: 8638610 Sewells Point, VA
T.M.: 75
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW2.23Mean Higher-High Water
MHW2.05Mean High Water
MTL1.09Mean Tide Level
MSL1.10Mean Sea Level
DTL1.11Mean Diurnal Tide Level
MLW0.13Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD881.23North American Vertical Datum of 1988
STND1.05Station Datum
GT2.24Great Diurnal Range
MN1.93Mean Range of Tide
DHQ0.18Mean Diurnal High Water Inequality
DLQ0.13Mean Diurnal Low Water Inequality
HWI4.44Greenwich High Water Interval (in hours)
LWI11.12Greenwich Low Water Interval (in hours)
Max Tide5.39Highest Observed Tide
Max Tide Date & Time10/01/2022 09:12Highest Observed Tide Date & Time
Min Tide-1.50Lowest Observed Tide
Min Tide Date & Time12/24/2022 17:18Lowest Observed Tide Date & Time
HAT2.85Highest Astronomical Tide
HAT Date & Time10/09/2029 17:42HAT Date and Time
LAT-0.65Lowest Astronomical Tide
LAT Date & Time01/31/2014 11:12LAT Date and Time
Tidal Datum Analysis Periods
12/01/2018 - 11/30/2019


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