U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 08/08/1983
Station ID: 9414392 SUPERCEDED DATE: 04/21/2003
Name: OYSTER POINT MARINA, SAN FRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 39.9' N
USGS Quad: SAN FRANCISO SOUTH Longitude: 122° 22.6' W
To reach the tidal bench marks proceed east along Oyster Point Boulevard, in
South San Francisco, then across railrod tracks to the breakwater at the Oyster
Point Marina. The tide gage and staff were located on the pier extending out
into the bay from the boat yard. The bench marks are along Oyster Point
Boulevard and around the marina.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL BM 11 1975
MONUMENTATION: Survey Disk VM#: 8108
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set in surface of concrete wall surrounding the Sunken
Stairwell on the west side of the South San Francisco Road and Gun Club
building, inside the chain link fence, 0.15 mile (0.24 km) west of Oyster Point
Marina harbormasters office on Oyster Point Boulevard, 41 feet (12.5 m) south of
NW corner of building, 15 feet (4.6 m) south of NW corner of stairwell, and 0.2
foot (0.1 m) above ground level.
BENCH MARK STAMPING: TIDAL BM 12 1975
MONUMENTATION: Survey Disk VM#: 8109
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Base
The bench mark is set in the concrete base of the northwesternmost of ten
loading docks (Door No. 1) along the NW wall of the Landstrom Company Warehouse
(336 Oyster Point Boulevard), 0.35 mile (0.56 km) west of harbormasters office
for the marina, 76 feet (23.2 m) south of the centerline of Oyster Point
Boulevard, 50.5 feet (15.4 m) south of a fire hydrant, and 3.9 feet (1.2 m)
above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 08/08/1983
Station ID: 9414392 SUPERCEDED DATE: 04/21/2003
Name: OYSTER POINT MARINA, SAN FRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 39.9' N
USGS Quad: SAN FRANCISO SOUTH Longitude: 122° 22.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 13 1975
MONUMENTATION: Survey Disk VM#: 8110
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Curb
The bench mark is set in the concrete curb at the foot of the pier leading to
Float A at the marina, 264 feet (80.5 m) NW of harbormaters office, 71.5 feet
(21.8 m) east of centerline of Oyster Point Boulevard, 21.5 feet (6.6 m) NW of a
fire hydrant, 1 foot (0.3 m) SE of the NW edge of the curb, and 2 feet (0.6 m)
above the ground.
BENCH MARK STAMPING: 14 1982
MONUMENTATION: Survey Disk VM#: 8111
AGENCY: PID:
SETTING CLASSIFICATION: Walkway
The bench mark is on the north face of the walkway to the new quest dock in the
new expanded Oyster Point Marina, on the most inshore end of the walkway and on
the top face of the concrete support foundation, 403.5 feet (123.0 m) NNW of the
center of the traffic circle at Oyster Point Marina, 81.0 feet (26.5 m) SE of
the centerline (at the approach) for dock No. 7, 45.8 feet (14.0 m) ENE of the
centerline of the roadway, 39.5 feet (12.0 m) ESE of fire call box No. 197, 8.5
feet (2.6 m) north of the first light pole along the dock, and 4.6 feet (1.4 m)
north of centerline of walkway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 08/08/1983
Station ID: 9414392 SUPERCEDED DATE: 04/21/2003
Name: OYSTER POINT MARINA, SAN FRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 39.9' N
USGS Quad: SAN FRANCISO SOUTH Longitude: 122° 22.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: J 571 1939
MONUMENTATION: Survey Disk VM#: 8112
AGENCY: PID#: HT0635
SETTING CLASSIFICATION: Semaphore
The bench mark is in the top of the center of the NW edge of the concrete base
of semaphore No. 83, 47.9 feet (14.6 m) west of the north corner of a large
corrugated metal building of the South San Francisco Plant of the Consolidated
Western Steel Corporation, 7.8 feet (2.4 m) SE of the SE rail of the SE track,
and level with the tracks.
BENCH MARK STAMPING: K 571 1939
MONUMENTATION: Survey Disk VM#: 8113
AGENCY: PID#: HT0636
SETTING CLASSIFICATION: Concrete Base
The bench mark is in the top of a large semi-circular concrete base at the SW
end of a concrete retaining wall of the flagpole, 0.3 mile (0.5 km) NE along the
Southern Pacific Company railroad from the station, at the Bethlehem Pacific
Coast Steel Company office, 102 feet (31 m) SE of and across from Industrial Way
from the SE rail of the SE track, 36.7 feet (11.2 m) NW of the west corner of
the office building, 19 feet (5.8 m) SE of Industrial Way, 0.5 foot (0.2 m) NE
of the NE edge of the flagpole and 4 feet (1.2 m) above the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 08/08/1983
Station ID: 9414392 SUPERCEDED DATE: 04/21/2003
Name: OYSTER POINT MARINA, SAN FRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 39.9' N
USGS Quad: SAN FRANCISO SOUTH Longitude: 122° 22.6' W
T I D A L D A T U M S
Tidal datums at OYSTER POINT MARINA, SAN FRANCISCO BAY based on:
LENGTH OF SERIES: 16 MONTHS
TIME PERIOD: DECEMBER 1974 - JANUARY 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9414750 ALAMEDA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (12/28/1974) = 8.54
MEAN HIGHER HIGH WATER MHHW = 7.06
MEAN HIGH WATER MHW = 6.43
MEAN TIDE LEVEL MTL = 3.78
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 3.34
MEAN LOW WATER MLW = 1.13
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (04/16/1976) = -1.88
* NGVD reference based on adjustment of 1965 and NOS levels of 1974-1977.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
TIDAL BM 11 1975 19.04 12.61
TIDAL BM 12 1975 63.38 56.95
TIDAL BM 13 1975 10.82 4.39
14 1982 9.64 3.21
J 571 1939 16.23 9.80
K 571 1939 24.95 18.52
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 08/08/1983
Station ID: 9414392 SUPERCEDED DATE: 04/21/2003
Name: OYSTER POINT MARINA, SAN FRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 39.9' N
USGS Quad: SAN FRANCISO SOUTH Longitude: 122° 22.6' 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.