U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
To reach the tidal bench marks from San Diego Freeway (I-405) in Santa Monica
go west on Santa Monica Freeway (I-10) to the Lincoln Boulevard exit. Exit
right and proceed NW on Lincoln Boulevard two blocks to Colorado Avenue, turn
left on Colorado Avenue and proceed SW until Colorado Avenue dead ends into
Santa Monica Municipal Pier. The tidal bench marks are in the vicinity of the
Municipal Pier. The tide house is located one deck below the Harbor Master's
Office at the seaward end of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL BM 12 1974
DESIGNATION: 941 0840 TIDAL 12
MONUMENTATION: Tidal Station disk VM#: 929
AGENCY: National Ocean Survey (NOS) IDB PID#: EW6840
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 34° 0.7' N ( 34.01111) LONGITUDE: 118° 29.7' W (-118.49558)
The primary bench mark is a disk set flush in the south curb of a westbound
access road to U.S. Highway 1, 24.08 m (79.0 ft) NW of the centerline of the
Colorado Avenue overpass, 3.96 m (13.0 ft) SW of the centerline of the access
road, 0.21 m (0.7 ft) north of the south end of a concrete guard rail, and 0.18
m (0.6 ft) above street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3 1940
DESIGNATION: 941 0840 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 924
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EW1586
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 34° 0.6' N ( 34.01022) LONGITUDE: 118° 29.8' W (-118.49642)
The bench mark is a disk set in the top of NW curb on the west end of the
Colorado Avenue Bridge, SW of Ocean Avenue where the Bridge connects onto Santa
Monica Municipal Pier, 193 m (632 ft) SW of the centerline of Ocean Avenue, and
2.90 m (9.5 ft) east of the west end of the bridge.
BENCH MARK STAMPING: 5 1941
DESIGNATION: 941 0840 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 928
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EW1593
SETTING CLASSIFICATION: Concrete wall OPUS PID:
LATITUDE: 34° 0.7' N ( 34.01094) LONGITUDE: 118° 29.5' W (-118.49103)
The bench mark is a disk set in the center at top of the SW concrete wall around
a flower bed on the NW side of the SW entrance to the Santa Monica City Hall,
2.53 m (8.3 ft) NW of the SE end of the wall, 7.01 m (23.0 ft) west of the
center of the entrance doorway, and 0.76 m (2.5 ft) higher than the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0840 N 1990
DESIGNATION: 941 0840 N
MONUMENTATION: Tidal Station disk VM#: 935
AGENCY: National Ocean Service (NOS) IDB PID#: AH7469
SETTING CLASSIFICATION: Concrete slab OPUS PID#: AH7469
LATITUDE: 34° 0.7' N ( 34.01144) LONGITUDE: 118° 29.7' W (-118.49556)
The bench mark is a disk set in the NE corner of a 2 m x 2 m (7 ft x 6 ft)
concrete slab that supports a cannon in the park along Ocean Avenue, 61 m (200
ft) NW of the centerline of the Colorado Avenue bridge, 12.80 m (42.0 ft) SE of
a drinking fountain, 11.89 m (39.0 ft) NE of a concrete fence that lines the
edge of the park, 0.15 m (0.5 ft) NE of the NE edge of the cannon, and 0.61 m
(2.0 ft) above ground level.
BENCH MARK STAMPING: 0840 P 1994
DESIGNATION: 941 0840 P
MONUMENTATION: Tidal Station disk VM#: 6768
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base slab OPUS PID:
LATITUDE: 34° 0.8' N ( 34.01389) LONGITUDE: 118° 29.9' W (-118.49828)
The bench mark is a disk set flush in the concrete base of a Pacific Utilities
Products electrical box located SW of Ocean Boulevard at the base of Santa
Monica Boulevard, 17.71 m (58.1 ft) WSW from the traffic signal pole at the
intersection, 12.22 m (40.1 ft) SE from the NE corner of Will Roger's monument,
and 1.22 m (4.0 ft) north of utility pole with power meter.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0840 Q 1994
DESIGNATION: 941 0840 Q
MONUMENTATION: Tidal Station disk VM#: 6769
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base slab OPUS PID:
LATITUDE: 34° 0.8' N ( 34.01333) LONGITUDE: 118° 29.9' W (-118.49764)
The bench mark is a disk set flush in the eastern corner of the concrete base of
canon monument in Palisades Park, located SW of Ocean Boulevard between Santa
Monica Boulevard and Broadway, 30.51 m (100.1 ft) south of the southern pillar
and visitors information center, 13.62 m (44.7 ft) north of a public viewing
telescope, 9.81 m (32.2 ft) south of a lamp post, and 0.21 m (0.7 ft) above
ground level.
BENCH MARK STAMPING: 0840 R 1994
DESIGNATION: 941 0840 R
MONUMENTATION: Tidal Station disk VM#: 6770
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge guardrail OPUS PID:
LATITUDE: 34° 0.7' N ( 34.01194) LONGITUDE: 118° 29.6' W (-118.49286)
The bench mark is a disk set flush in top of a concrete bridge guard rail, in a
0.61 m x 1.40 m (2.0 ft x 4.6 ft) base at the southern end of the bridge
crossing over Pacific Coast Highway, located on the western side of Main Street,
9.99 m (32.8 ft) west of centerline of Main Street, 8.50 m (27.9 ft) NNE of
yellow fire hydrant, and 1.25 m (4.1 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0840 S 1994
DESIGNATION: 941 0840 S
MONUMENTATION: Tidal Station disk VM#: 6777
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base slab OPUS PID:
LATITUDE: 34° 0.8' N ( 34.01253) LONGITUDE: 118° 29.8' W (-118.49653)
The bench mark is a disk set flush in concrete base of a lightpole near SE
corner of intersection of Broadway and Ocean Avenue, 19.60 m (64.3 ft) east of a
flagpole, 8.56 m (28.1 ft) south of the lightpole at the base of Broadway, and
0.03 m (0.1 ft) NE of NE side of lightpole base.
BENCH MARK STAMPING: 0840 T 1995
DESIGNATION: 941 0840 T
MONUMENTATION: Tidal Station disk VM#: 12697
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 34° 0.5' N ( 34.00830) LONGITUDE: 118° 30.0' W (-118.50000)
The bench mark is a disk set flush in a concrete base supporting a storm drain
lid under the Colorado Avenue bridge leading to Santa Monica Pier, 20.80 m (68.2
ft) SE of a stop sign at the corner of Appian Way and entrance leading to the
beach, 10.12 m (33.2 ft) east of yellow fire hydrant at the corner of the
entrance to beach parking north of Colorado Avenue and the boardwalk, 1.80 m
(5.9 ft) north of an electrical box adjacent to the most southern of pillars
supporting bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
T I D A L D A T U M S
Tidal datums at SANTA MONICA, PACIFIC OCEAN based on:
LENGTH OF SERIES: 18 Years
TIME PERIOD: January 1984 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (11/30/1982) = 2.590
MEAN HIGHER HIGH WATER MHHW = 1.653
MEAN HIGH WATER MHW = 1.428
MEAN TIDE LEVEL MTL = 0.855
MEAN SEA LEVEL MSL = 0.849
MEAN LOW WATER MLW = 0.283
North American Vertical Datum NAVD88 = 0.057
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/17/1933) = -0.867
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL BM 12 1974 14.315 12.887
3 1940 7.779 6.351
5 1941 20.328 18.900
0840 N 1990 19.093 17.665
0840 P 1994 22.065 20.637
0840 Q 1994 21.344 19.916
0840 R 1994 22.151 20.723
0840 S 1994 20.151 18.723
0840 T 1995 5.973 4.545
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9410840 PUBLICATION DATE: 04/21/2003
Name: SANTA MONICA, PACIFIC OCEAN
CA
NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830)
USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000)
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.