Superseded Bench Mark Sheet for 9414764, Oakland Inner Harbor CA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  09/21/2000
Station ID: 9414764                                SUPERCEDED DATE:   04/21/2003
Name:       OAKLAND INNER HARBOR, S.F.BAY                     
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.7' N
USGS Quad:  OAKLAND WEST                           Longitude:       122° 16.9' W


To reach the bench marks go to the Oakland Fire Department Station 2 on the west
side of the intersection of Clay and Water streets at the west end of Jack
London Square in Oakland, California.  The bench marks are in the vicinity, and
the tide station was located inside the fire station compound, approximately 12
m (40 ft) north of the wharf face beneath the fire station building overhang.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  PORT 1 1936
                         DESIGNATION:          PORT 1
                         ALIAS:                941 4764 TIDAL 1

MONUMENTATION:           Tidal Station disk                        VM#:     8401
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID#:  HT0654
SETTING CLASSIFICATION:  Concrete seawall


The primary bench mark is a disk set on the north edge of the concrete seawall
at the foot of Clay Street, 5 m (16 ft) west of the west wall of the Clay Street
pier, and 2 m (7 ft) west of a fire plug.



                         BENCH MARK STAMPING:  PORT 2 1936
                         DESIGNATION:          PORT 2
                         ALIAS:                941 4764 TIDAL 2

MONUMENTATION:           Tidal Station disk                        VM#:     8402
AGENCY:                  US Coast & Geodetic Survey (USC&GS)       PID#:  HT0655
SETTING CLASSIFICATION:  Concrete wall


The bench mark is a disk set vertically in the east concrete wall of Pacific Gas
and Electric Steam Power Plant Nunmber C, at the SW corner of Embarcedero Road
and Jefferson Street, 0.45 m (1.5 ft) south of the NE corner of the plant, and 1
m (3 ft) above the sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  09/21/2000
Station ID: 9414764                                SUPERCEDED DATE:   04/21/2003
Name:       OAKLAND INNER HARBOR, S.F.BAY                     
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.7' N
USGS Quad:  OAKLAND WEST                           Longitude:       122° 16.9' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  4764 A 1994
                         DESIGNATION:          941 4764 A

MONUMENTATION:           Tidal Station disk                        VM#:    12898
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete bulkhead


The bench mark is a disk set flush in the concrete bulkhead fronting the wooden
deck on the SW corner of the Waterfront Plaza hotel property, the hotel's small
asphalt paved parking lot is adjacent to the cobbled drive leading to the wooden
deck, 15.78 m (51.8 ft) NNW of the center of wooden octogonal stage located on
the wooden deck, 12 m (40 ft) south of the centerline of the parking lot, 11.43
m (37.5 ft) SW of a white fire hydrant, and 0.3 m (1 ft) NE of the NW end of
railing surrounding the wooden deck.



                         BENCH MARK STAMPING:  4764 B 1994
                         DESIGNATION:          941 4764 B

MONUMENTATION:           Tidal Station disk                        VM#:    12899
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete traffic island


The bench mark is a disk set flush in concrete on top of a traffic island
leading to the entrance of the Oakland/Alameda ferry parking lot located at the
corner of the Washington and Embarcedero West Street, 12.04 m (39.5 ft) east of
the centerline of Washington Street, 3.26 m (10.7 ft) west of the parking lot
toll booth, 1.01 m (3.3 ft) south of the north edge of the traffic island, and
0.18 m (0.6 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  09/21/2000
Station ID: 9414764                                SUPERCEDED DATE:   04/21/2003
Name:       OAKLAND INNER HARBOR, S.F.BAY                     
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.7' N
USGS Quad:  OAKLAND WEST                           Longitude:       122° 16.9' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  4764 C 1994
                         DESIGNATION:          941 4764 C

MONUMENTATION:           Tidal Station disk                        VM#:    12900
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete foundation


The bench mark is a disk set flush in concrete foundation of a transformer
located near the NE corner of the PG&E Station C substation, 16.55 m (54.3 ft)
west of the centerline of Jefferson Street, 11.33 m (37.2 ft) south of the
centerline of 2nd Street, 7.13 m (23.4 ft) SE of the center of a grated storm
drain cover, 0.15 m (0.5 ft) north of wood slated cyclone fence surrounding the
substation, and 0.21 m (0.7 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  09/21/2000
Station ID: 9414764                                SUPERCEDED DATE:   04/21/2003
Name:       OAKLAND INNER HARBOR, S.F.BAY                     
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.7' N
USGS Quad:  OAKLAND WEST                           Longitude:       122° 16.9' W


                            T I D A L   D A T U M S 


Tidal datums at OAKLAND INNER HARBOR, S.F.BAY based on:

     LENGTH OF SERIES:      1 MONTHS
     TIME PERIOD:           August 1994 - August 1994
     TIDAL EPOCH:           1960-1978
     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   =  1.936
     MEAN HIGH WATER                            MHW    =  1.751
     MEAN TIDE LEVEL                            MTL    =  1.044
     MEAN SEA LEVEL                             MSL    =  1.023
     MEAN LOW WATER                             MLW    =  0.337
     North American Vertical Datum              NAVD88 =  0.073
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     PORT 1 1936                                 2.934    1.183
     PORT 2 1936                                 4.036    2.285
     4764 A 1994                                 3.175    1.424
     4764 B 1994                                 3.886    2.135
     4764 C 1994                                 3.934    2.183


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                   PUBLICATION DATE:  09/21/2000
Station ID: 9414764                                SUPERCEDED DATE:   04/21/2003
Name:       OAKLAND INNER HARBOR, S.F.BAY                     
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.7' N
USGS Quad:  OAKLAND WEST                           Longitude:       122° 16.9' 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.

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