U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9410738 PUBLICATION DATE: 07/21/2003
Name: KING HARBOR, SANTA MONICA BAY
CA
NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670)
USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800)
To reach the tidal bench marks from the Pacific Coast Highway (State Highway 1)
and Beryl Drive, proceed west on Beryl Drive for 0.6 km (0.4 mi) to Harbor
Drive, then turn left and proceed north on Harbor Drive to King Harbor. The
bench marks are on the west and north sides of Basin 2. The tide station was on
the SW corner of the Harbormasters pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL BM 1 1975
DESIGNATION: 941 0738 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 11740
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800)
The primary bench mark is a disk set in the 0.4 m (1.3 ft) diameter concrete
foundation of a flagpole, 1 m (3 ft) east of the pier walkway to the
harbormaster's office, and 0.24 m (0.8 ft) above grade.
BENCH MARK STAMPING: TIDAL BM 2 1975
DESIGNATION: 941 0738 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 11741
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: BBCR83
LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800)
The bench mark is a disk set in the west edge of the concrete sidewalk running
north-south along the west seawall of the harbor at Basin 2, 18 m (60 ft) NE of
the flagpole, and 3 m (10 ft) west of the southernmost gate to the floating
slips.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9410738 PUBLICATION DATE: 07/21/2003
Name: KING HARBOR, SANTA MONICA BAY
CA
NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670)
USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 3 1975
DESIGNATION: 941 0738 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 11742
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800)
The bench mark is a disk set in the concrete sidewalk at the NW corner of the
boat harbor at Basin 2, where the east-west and north-south running sidewalks
bordering the harbor seawall intersect.
BENCH MARK STAMPING: TIDAL BM 4 1975
DESIGNATION: 941 0738 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 11743
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800)
The bench mark is a disk set in the concrete sidewalk running east-west along
the north seawall of the harbor, 30 m (100 ft) east of the NW corner, and 0.3 m
(1 ft) west of the second gate east of the NW corner.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9410738 PUBLICATION DATE: 07/21/2003
Name: KING HARBOR, SANTA MONICA BAY
CA
NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670)
USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 5 1975
DESIGNATION: 941 0738 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 11744
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800)
The bench mark is a disk set in the sidewalk running east-west along the north
seawall of the harbor, 122 m (400 ft) east of the NW corner of the harbor, and
0.3 m (1 ft) west of the fourth gate east of the NW corner.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9410738 PUBLICATION DATE: 07/21/2003
Name: KING HARBOR, SANTA MONICA BAY
CA
NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670)
USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800)
T I D A L D A T U M S
Tidal datums at KING HARBOR, SANTA MONICA BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 1975 - October 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9410660 LOS ANGELES, OUTER HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.622
MEAN HIGH WATER MHW = 1.397
MEAN TIDE LEVEL MTL = 0.842
MEAN SEA LEVEL MSL = 0.833
MEAN LOW WATER MLW = 0.287
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL BM 1 1975 3.422 2.025
TIDAL BM 2 1975 2.646 1.249
TIDAL BM 3 1975 2.701 1.304
TIDAL BM 4 1975 2.679 1.282
TIDAL BM 5 1975 2.681 1.284
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9410738 PUBLICATION DATE: 07/21/2003
Name: KING HARBOR, SANTA MONICA BAY
CA
NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670)
USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800)
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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
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.