U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' W
To reach the tidal bench marks from the Harbor Boulevard exit on Interstate
Highway 110 (Harbor Freeway) in San Pedro, proceed south on Harbor Boulevard to
a stop sign, continue on (new) Miner Street to 22nd Street, the east on 22nd
Street to Signal Street, then south on Signal Street to the end of Pier 1. The
bench marks are near Signal Street and the railroad tracks leading to and along
Pier 1. The tide gauge and staff are at the SW end of Pier 1, Berth 60.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8-14 FT ABOVE MLLW
MONUMENTATION: Survey Disk VM#: 1601
AGENCY: PID#: DY1083
SETTING CLASSIFICATION: Concrete
The primary bench mark is set flush in concrete at the south end of Signal
Street at the SSW end of Berth 60 and accessible through a 6-inch diameter pipe
with cover, 78 feet (24 m) south of the SW corner of a transit shed, 37.5 feet
(11.4 m) west of the SE corner of the pier, 26 feet (8 m) east of the SW corner
of the pier, 3 feet (1 m) north of the south face of the dock, and 0.2 foot
(0.1 m) below the surface of the wharf.
BENCH MARK STAMPING: 49 1936
MONUMENTATION: Survey Disk VM#: 1593
AGENCY: PID#: DY1066
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set vertically in a retaining wall between Harbor Boulevard
and Sampson Way with chiseled BM letters and arrow in wall pointing toward bench
mark, 160 feet (49 m) north of the south end of the wall, 72 feet (22 m) west of
the westernmost rail of railroad tracks parallel to the retaining wall, and 1.0
foot (0.3 m) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WILMINGTON D9A 1954
MONUMENTATION: Survey Disk VM#: 1594
AGENCY: PID#: DY1078
SETTING CLASSIFICATION: Concrete
The bench mark is set in a Los Angeles Engineers hand hold near the intersection
of Signal and 22nd Streets, 48.9 feet (14.9 m) NW of the SE outer corner
curbing, 45.7 feet (13.9 m) SW of the NE outer corner curbing, and 1 foot (0.3
m) below street surface.
BENCH MARK STAMPING: WILMINGTON D10B 1954
MONUMENTATION: Survey Disk VM#: 1595
AGENCY: PID#: DY1080
SETTING CLASSIFICATION: Concrete
The bench mark is set in a Los Angeles Engineers hand hole in the center of
Signal Street, 0.5 mile (0.8 km) south of 22nd Street, 38.4 feet (11.7 m) west
of the SW corner of warehouse NO 1, and 34 feet (10 m) north of the wooden guard
rail at the end of Signal Street.
BENCH MARK STAMPING: 11 1935 RESET 1967
MONUMENTATION: Survey Disk VM#: 1596
AGENCY: PID#: DY1085
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the concrete foundation of the Outer Dock and Wharf
building, 330 feet (100 m) south of the centerline of 22nd Street, 14 feet (4 m)
east of the west edge of a loading dock, 12.5 feet (3.8 m) NW of the centerline
of the north door of the Outer dock and Wharf building, 1 foot (0.3 m) south of
the north edge of a concrete foundation, and 0.5 foot (0.2 m) NW of the NW
corner of the U.S. Army MTC Outport building at Berth 55.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 13 1971
MONUMENTATION: Survey Disk VM#: 1597
AGENCY: PID#: DY2514
SETTING CLASSIFICATION: Concrete Platform
The bench mark is set in a concrete loading platform on the east side of a
transite shed at Berth 59 between hanger doors 22 and 23, 94 feet (29 m) west of
the centerline of Signal Street, 9 feet (3 m) north of hanger door 23, 8 feet
(2 m) wst of the eastern edge of loading dock, and 1 foot (0.3 m) east of the
east side of building.
BENCH MARK STAMPING: A 1296 1977
MONUMENTATION: Survey Disk VM#: 1598
AGENCY: PID#: DY2515
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is 155 feet (47 m) east of the SE corner of the concrete
structure at the SW corner of Berth 60, 47.4 feet (14.4 m) south of Bench Mark
WILMINGTON D-10-B 1954, and 3.2 feet (1.0 m) north of a telephone pole with an
attached witness post. The bench mark is crimped to an unspecified steel rod
driven an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0660 M 1977
MONUMENTATION: Survey Disk VM#: 1599
AGENCY: PID#: DY2516
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is on Signal Street, 70 feet (21 m) SE of the NE corner of Beacon
and Company warehouse at 2165 Signal Street opposite door NO 1, 36 feet (11 m)
north of the edge of a power pole, 27 feet (8 m) west of the concrete wall of
the Signal Street viaduct, 15 feet (5 m) east of the easternmost railroad track,
and 1.8 feet (0.5 m) west of the curb. The bench mark is crimped to a
copper-clad steel rod driven 78 feet (24 m), and encased in a PVC pipe with cap.
BENCH MARK STAMPING: 0660 N 1977
MONUMENTATION: Survey Disk VM#: 1600
AGENCY: PID#: DY2512
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is in a planter about 90 feet (27 m) NE of the intersection of
Signal and 22nd Streets, 71 feet (22 m) east of the centerline of Signal Street,
37 feet (11 m) NE of a light standard at the NE corner of the intersection, and
1 foot (0.3 m) SW of a metal witness post. The bench mark is crimped to a
copper-clad steel rod driven 22 feet (7 m), and encased in a PVC pipe with a
screw cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' W
T I D A L D A T U M S
Tidal datums at SAN PEDRO, LOS ANGELES OUTER HARBOR based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: 1960-1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/27/1983) = 7.96
MEAN HIGHER HIGH WATER MHHW = 5.52
MEAN HIGH WATER MHW = 4.77
MEAN TIDE LEVEL MTL = 2.86
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 2.76
MEAN LOW WATER MLW = 0.95
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/17/1933) = -2.59
* NGVD reference based on elevations published in Quad L24301, 1980, and NOS
leveling of 1990.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8-14 FT ABOVE MLLW 13.90 9.13
49 1936 12.36 7.59
WILMINGTON D9A 1954 9.89 5.12
WILMINGTON D10B 1954 9.45 4.68
11 1935 RESET 1967 15.61 10.84
NO 13 1971 13.77 9.00
A 1296 1977 10.54 5.77
0660 M 1977 11.85 7.08
0660 N 1977 11.80 7.03
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 07/25/1991
Station ID: 9410660 SUPERCEDED DATE: 04/21/2003
Name: SAN PEDRO, LOS ANGELES OUTER HARBOR
CALIFORNIA
NOAA Chart: 18749 Latitude: 33° 43.2' N
USGS Quad: SAN PEDRO Longitude: 118° 16.3' 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.