U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9410179 PUBLICATION DATE: 12/10/2015
Name: OCEAN BEACH, POINT LOMA
CA
NOAA Chart: 18765 Latitude: 32° 44.9' N ( 32.74830)
USGS Quad: Point Loma Longitude: 117° 15.3' W (-117.25500)
To reach the tidal bench marks from the San Diego International Airport
(Lindberg Field) follow North Harbor Drive West to Nimitz Boulevard and make a
right. Keep to the left as Nimitz Boulevard veers right and runs into
Narragansett Avenue. Follow Narragansett Avenue across Chatsworth Boulevard
until you reach Sunset Cliffs Boulevard. Make a right on Sunset Cliffs
Boulevard and then a left onto Niagra street. Follow Niagra Street to the Ocean
Beach Pier. Tidehouse is at the end of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0179 A 1994
DESIGNATION: 941 0179 A
MONUMENTATION: TIDAL STATION DISK VM#: 15693
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 32° 44.9' N ( 32.74831) LONGITUDE: 117° 15.3' W (-117.25500)
The primary bench mark is a disk set in the top of the SE corner of a 0.50 m x
0.50 m (1.6 ft x 1.6 ft) concrete base supporting light pole #18 which is the
sixth light pole on the north side of the pier when looking east from the
tidehouse, 400 m (1,312 ft) west of the east end of Ocean Beach pier, and 0.05 m
(0.2 ft) above the pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9410179 PUBLICATION DATE: 12/10/2015
Name: OCEAN BEACH, POINT LOMA
CA
NOAA Chart: 18765 Latitude: 32° 44.9' N ( 32.74830)
USGS Quad: Point Loma Longitude: 117° 15.3' W (-117.25500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0179 B 1994
DESIGNATION: 941 0179 B
MONUMENTATION: TIDAL STATION DISK VM#: 15694
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 32° 44.9' N ( 32.74831) LONGITUDE: 117° 15.3' W (-117.25500)
The bench mark is a disk set flush in the concrete deck of the Ocean Beach Pier
on the southern side of the eastern end of the pier, 3.70 m (12.1 ft) north of
power pole # 86, 0.43 m (1.4 ft) west of the metal lip where the pier begins
from Niagra Street, 0.35 m (1.1 ft) north of the southern face of the pier, and
0.13 m (0.4 ft) north of the wooden railing.
BENCH MARK STAMPING: 0179 C 1994
DESIGNATION: 941 0179 C
MONUMENTATION: TIDAL STATION DISK VM#: 15695
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 32° 44.9' N ( 32.74831) LONGITUDE: 117° 15.3' W (-117.25500)
The bench mark is a disk set flush in the top of the SE corner of the retaining
wall surrounding Ocean Beach public lot, 10.35 m (34.0 ft) NW of the SW corner
of 5064B Niagra Avenue, 8.25 m (27.1 ft) south of a power pole, 0.35 m (1.1 ft)
from the SE edge of the retaining wall, and 3.15 m (10.3 ft) above the parking
lot.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9410179 PUBLICATION DATE: 12/10/2015
Name: OCEAN BEACH, POINT LOMA
CA
NOAA Chart: 18765 Latitude: 32° 44.9' N ( 32.74830)
USGS Quad: Point Loma Longitude: 117° 15.3' W (-117.25500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0179 D 1994
DESIGNATION: 941 0179 D
MONUMENTATION: TIDAL STATION DISK VM#: 15696
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 32° 44.9' N ( 32.74831) LONGITUDE: 117° 15.3' W (-117.25500)
The bench mark is a disk set flush in the top of the southern end of the sea
wall located north of the steps along the Ocean Beach beach front, 7.90 m (25.9
ft) north of a flagpole, 8.50 m (27.9 ft) west of street lamp #5099, 0.10 m (0.3
ft) west of the eastern edge of the sea wall, and 0.42 m (1.4 ft) above the
sidewalk.
BENCH MARK STAMPING: 0179 E 1994
DESIGNATION: 941 0179 E
MONUMENTATION: TIDAL STATION DISK VM#: 15697
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 32° 44.9' N ( 32.74831) LONGITUDE: 117° 15.3' W (-117.25500)
The bench mark is a disk set flush in the northern end of the sea wall at the
Ocean Beach beach, 20.73 m (73.0 ft) west of a 1.50 m (4.9 ft) tall steel
electrical box, 21.77 m (71.4 ft) south of a bench, 4.50 m (14.8 ft) east of the
SE leg of lifeguard hut No. 1, 0.20 m (0.7 ft) south of the northern end of the
wall, and 0.34 m (1.1 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9410179 PUBLICATION DATE: 12/10/2015
Name: OCEAN BEACH, POINT LOMA
CA
NOAA Chart: 18765 Latitude: 32° 44.9' N ( 32.74830)
USGS Quad: Point Loma Longitude: 117° 15.3' W (-117.25500)
T I D A L D A T U M S
Tidal datums at OCEAN BEACH, POINT LOMA based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: June 1994 - July 1994
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9410230 LA JOLLA, PACIFIC OCEAN
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METER:
MEAN HIGHER HIGH WATER MHHW = 1.623
MEAN HIGH WATER MHW = 1.398
MEAN TIDE LEVEL MTL = 0.832
MEAN SEA LEVEL MSL = 0.825
MEAN LOW WATER MLW = 0.266
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METER above:
Stamping or Designation MLLW MHW
0179 A 1994 6.231 4.833
0179 B 1994 10.449 9.051
0179 C 1994 8.210 6.812
0179 D 1994 4.926 3.528
0179 E 1994 4.888 3.490
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9410179 PUBLICATION DATE: 12/10/2015
Name: OCEAN BEACH, POINT LOMA
CA
NOAA Chart: 18765 Latitude: 32° 44.9' N ( 32.74830)
USGS Quad: Point Loma Longitude: 117° 15.3' W (-117.25500)
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.