NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Parts of the U.S. Government are closed. However, because the information this site provides is necessary to protect life and property, it will be updated and maintained during the Federal Government shutdown. For critical weather information, please visit To learn more, see

Datums for 9414811, Bradmoor Island CA

NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9414811, Bradmoor Island, CA
Status: Accepted (Jul 7 2009)
Units: Feet
Control Station: 9415144 Port Chicago, CA
T.M.: 120
Epoch: 1983-2001
Datum: MLLW
MHHW5.48Mean Higher-High Water
MHW4.96Mean High Water
MTL2.85Mean Tide Level
MSL2.89Mean Sea Level
DTL2.74Mean Diurnal Tide Level
MLW0.75Mean Low Water
MLLW0.00Mean Lower-Low Water
STND-4.00Station Datum
GT5.49Great Diurnal Range
MN4.21Mean Range of Tide
DHQ0.52Mean Diurnal High Water Inequality
DLQ0.75Mean Diurnal Low Water Inequality
HWI10.68Greenwich High Water Interval (in hours)
LWI4.80Greenwich Low Water Interval (in hours)
Max Tide7.32Highest Observed Tide
Max Tide Date & Time01/08/2005 20:12Highest Observed Tide Date & Time
Min Tide-1.00Lowest Observed Tide
Min Tide Date & Time04/22/2004 19:24Lowest Observed Tide Date & Time
HAT6.90Highest Astronomical Tide
HAT Date & Time12/30/1986 20:54HAT Date and Time
LAT-1.69Lowest Astronomical Tide
LAT Date & Time01/01/1987 05:24LAT Date and Time
Tidal Datum Analysis Periods
04/01/2004 - 08/31/2004
10/01/2004 - 07/31/2005

Products available at 9414811 Bradmoor Island, CA

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