U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
To reach the tidal bench marks from San Francisco, proceed east along the
Oakland Bay Bridge to the exit at Yerba Buena, then follow the signs to the
Coast Guard Station. The bench marks are located in the vicinity of the Coast
Guard Station and near the bridge. The tide gage and staff were located on the
north side of the concrete pier south of a float pier and offices at the Coast
Guard facility.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: RECEIVE RESET 1970
DESIGNATION: RECEIVE RESET
MONUMENTATION: Bench Mark disk VM#: 8411
AGENCY: National Geodetic Survey (NGS) IDB PID#: HT0803
SETTING CLASSIFICATION: Concrete pier OPUS PID#: HT0803
LATITUDE: 37° 48.6' N ( 37.81000) LONGITUDE: 121° 21.6' W (-121.36000)
The primary bench mark is a disk set in the surface of the dock at the end of
the north side of the concrete pier located at Yerba Buena U.S. Coast Guard
Base, 8.08 m (26.5 ft) ESE of the SE corner of the transformer building, and 2 m
(5 ft) west of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8 1936
DESIGNATION: TIDAL 8 STA III 19
MONUMENTATION: Bench Mark disk VM#: 8407
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0850
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 37° 48.8' N ( 37.81330) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set in the south end of a concrete abutment, 7 m (23
ft) south of the SE corner of the Pacific Telephone and Telegraph Cable
Building, 0.55 m (1.8 ft) west of the east face of the abutment and 0.40 m (1.3
ft) north of the south end of the abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9 1936
DESIGNATION: TIDAL 9 STA III 19
MONUMENTATION: Bench Mark disk VM#: 8408
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0847
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 37° 48.8' N ( 37.81330) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set in the lowest step of the footing of the
easternmost bridge pier of the Oakland Bay Bridge on the NE point of the island,
1.98 m (6.5 ft) east of the west face of the footing, and 0.3 m (1 ft) north of
the south face of the footing.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO. 11 1947
DESIGNATION: TIDAL 11 STA III 19
MONUMENTATION: Bench Mark disk VM#: 8409
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0853
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: 37° 48.8' N ( 37.81330) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set in a concrete head wall under the Oakland Bay
Bridge located at the NE point of the island, 13 m (42 ft) SE of the east corner
of the building No. 263, 0.46 m (1.5 ft) from the east edge of the wall, and
0.24 m (0.8 ft) from the south edge of the wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO. 13 1947
DESIGNATION: TIDAL 13 STA III 19
MONUMENTATION: Bench Mark disk VM#: 8410
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0848
SETTING CLASSIFICATION: Concrete platform OPUS PID:
LATITUDE: 37° 48.8' N ( 37.81330) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set in the east corner of the concrete platform
supporting the red brick incinerator located on the NE point of the island, 23 m
(76 ft) NE of the north corner of Fire House No. 3, building 204, and 5 m (16
ft) SE of the east cornor of the red brick incinerator.
BENCH MARK STAMPING: YB 1 1993
DESIGNATION: 941 4782 YB 1
MONUMENTATION: Survey disk VM#: 15618
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 37° 48.6' N ( 37.81000) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set flush with the surface of the concrete retaining
wall, 46.66 m (153.1 ft) south of the SE corner of a fixed concrete barbeque
pit, 7.68 m (25.2 ft) east of the NE corner of Phillips Hall, and 2.90 m (9.5
ft) east of the SE corner of a tennis court just NE of Phillips Hall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: YB 2 1993
DESIGNATION: 941 4782 YB 2
MONUMENTATION: Survey disk VM#: 15619
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 37° 48.6' N ( 37.81000) LONGITUDE: 121° 21.6' W (-121.36000)
The bench mark is a disk set flush with the top of rock outcrop which is
approximately 0.91 m (3 ft) above the beach approximate high water line, 32.92 m
(108.0 ft) SW of bench mark 8 1936, 25.30 m (83.0 ft) SE of the sewer manhole at
the base of the bay bridge abutment along the north side of the paved access
road to PAC Bell Power House, and 14.48 m (47.5 ft) west of the SE corner of the
concrete abutment of PAC Bell Cable X-ING Power House Pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
T I D A L D A T U M S
Tidal datums at YERBA BUENA ISLAND, SAN FRANCISCO BAY based on:
LENGTH OF SERIES: 6 MONTHS
TIME PERIOD: March 1993 - August 1993
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9414750 ALAMEDA, SAN FRANCISCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.895
MEAN HIGH WATER MHW = 1.710
MEAN TIDE LEVEL MTL = 1.024
MEAN SEA LEVEL MSL = 1.008
MEAN LOW WATER MLW = 0.338
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.027
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
RECEIVE RESET 1970 3.630 1.920
8 1936 3.701 1.991
9 1936 7.507 5.797
NO. 11 1947 3.698 1.988
NO. 13 1947 4.749 3.039
YB 1 1993 3.114 1.404
YB 2 1993 2.502 0.792
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 9414782 PUBLICATION DATE: 02/26/2004
Name: YERBA BUENA ISLAND, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 48.6' N ( 37.81000)
USGS Quad: OAKLAND WEST Longitude: 122° 21.6' W (-122.36000)
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.