U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 06/21/1982
Station ID: 9410614 SUPERCEDED DATE: 04/21/2003
Name: HUNTINGTON BEACH, PACIFIC OCEAN
CALIFORNIA
NOAA Chart: 18746 Latitude: 33° 39.6' N
USGS Quad: SEAL BEACH Longitude: 118° 0.3' W
To reach the tidal bench marks proceed south along Pacific Coast Highway (US 1)
from Los Angeles to Huntington Beach and the muncipal pier projecting out into
the Pacific Ocean. The tide gage and staff were located on the platform section
of the pier adjacent to the fishing platform section of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 2 1974
MONUMENTATION: Survey Disk VM#: 8001
AGENCY: PID#: DY9303
SETTING CLASSIFICATION: Concrete
The bench mark is set flush in concrete on Huntington Pier, on south side of
pier, and at the eastern edge of and in front of the lifeguard tower.
BENCH MARK STAMPING: NO 1 1974
MONUMENTATION: Survey Disk VM#: 8000
AGENCY: PID:
SETTING CLASSIFICATION: Concrete
The bench mark is set flush in concrete on Huntington pier on south side of
pier, 229.7 feet (70 m) from L at the western end of the pier and at eastern
edge of the fishing platform.
BENCH MARK STAMPING: NO 3 1974
MONUMENTATION: Survey Disk VM#: 8002
AGENCY: PID#: DY9301
SETTING CLASSIFICATION: Concrete
The bench mark is set flush in concrete curbing south of white fire hydrant and
10 feet (3.2 m) north of the entrance to the turn around at the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 06/21/1982
Station ID: 9410614 SUPERCEDED DATE: 04/21/2003
Name: HUNTINGTON BEACH, PACIFIC OCEAN
CALIFORNIA
NOAA Chart: 18746 Latitude: 33° 39.6' N
USGS Quad: SEAL BEACH Longitude: 118° 0.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1974
MONUMENTATION: Survey Disk VM#: 8003
AGENCY: PID:
SETTING CLASSIFICATION: Concrete
The bench mark is set flush in the concrete on the south side of the 4th lamp
post north of the entrance to the turn around at the pier, in the center of the
sidewalk, and 1 foot (0.3 m) from the lamp post.
BENCH MARK STAMPING: S 766 1945
MONUMENTATION: Survey Disk VM#: 8004
AGENCY: PID#: DY0822
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of 2.5 foot (0.8 m) high monument, at
northeastern end of the pier, part of the old concrete pier structure between
the circular turn around and the steps leading down the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 06/21/1982
Station ID: 9410614 SUPERCEDED DATE: 04/21/2003
Name: HUNTINGTON BEACH, PACIFIC OCEAN
CALIFORNIA
NOAA Chart: 18746 Latitude: 33° 39.6' N
USGS Quad: SEAL BEACH Longitude: 118° 0.3' W
T I D A L D A T U M S
Tidal datums at HUNTINGTON BEACH, PACIFIC OCEAN based on:
LENGTH OF SERIES: 74 HW & 73 LW
TIME PERIOD: MARCH 4 - APRIL 11, 1975
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9410660 LOS ANGELES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
MEAN HIGHER HIGH WATER MHHW = 5.36
MEAN HIGH WATER MHW = 4.62
MEAN TIDE LEVEL MTL = 2.78
MEAN LOW WATER MLW = 0.94
MEAN LOWER LOW WATER MLLW = 0.00
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 2 1974 29.04 24.42
NO 1 1974 25.55 20.93
NO 3 1974 28.15 23.53
NO 4 1974 29.51 24.89
S 766 1945 30.14 25.52
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 06/21/1982
Station ID: 9410614 SUPERCEDED DATE: 04/21/2003
Name: HUNTINGTON BEACH, PACIFIC OCEAN
CALIFORNIA
NOAA Chart: 18746 Latitude: 33° 39.6' N
USGS Quad: SEAL BEACH Longitude: 118° 0.3' W
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.