Superseded Bench Mark Sheet for 9414317, PIER 22 1/2, SAN FRANCISCO CA

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  07/26/1983
Station ID: 9414317                                SUPERCEDED DATE:   04/21/2003
Name:       PIER 22, SAN FRANCISCO, SANFRANCISCO BAY          
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.4' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 23.2' W


To reach the tidal bench marks proceed NE along Harrison Street to the
Embarcadero and San Francisco City Firehouse.  The tide gage and staff were
located on the west side of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  179 1925

MONUMENTATION:           Survey Disk                               VM#:     8094
AGENCY:                                                            PID#:  HT0759
SETTING CLASSIFICATION:  Concrete Wall


The bench mark is set vertically in the NW concrete wall of the San Francisco
Fire Department Engine House (N0.9 Building), on the Embarradero between Piers
22 and 24, 0.8 foot (0.2 m) NE of the west corner of the building, and 0.6 foot
(0.2 m) above the street.



                         BENCH MARK STAMPING:  TIDAL BM NO 1 1974

MONUMENTATION:           Survey Disk                               VM#:     8093
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Factory Floor


The bench mark is set in the floor of a small alcove in the Joseph Magnin
Factory, located on the SE side of Harrison Street between Spear and Steuart
Streets, 6.6 feet (20 m) SW of the north corner of the building, 42 feet (12.8
m) SE of the centerline of Harrison Street, 0.7 foot (0.2 m) SW of the NE end of
the calcove, 3.9 feet (1.2 m) above street level, and 0.2 foot (0.1 m) above the
sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  07/26/1983
Station ID: 9414317                                SUPERCEDED DATE:   04/21/2003
Name:       PIER 22, SAN FRANCISCO, SANFRANCISCO BAY          
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.4' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 23.2' W


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


                         BENCH MARK STAMPING:  DD 109 1932

MONUMENTATION:           Survey Disk                               VM#:     8095
AGENCY:                                                            PID#:  HT0758
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set in the top of the NW corner of the concrete retaining wall
of the Atchison, Tepeka, and Santa Fe Railway yards, 14.2 feet (4.3 m) east of
the east curb of Main Street, 8.2 feet (2.5 m) south of the south curb of
Harrison Street, and level with the sidewalk.



                         BENCH MARK STAMPING:  M 329 12.077

MONUMENTATION:           Survey Disk                               VM#:     8096
AGENCY:                                                            PID#:  HT0787
SETTING CLASSIFICATION:  Pillar of Pier


The bench mark is set vertically in the NE face of the NW pillar of the first
pier NE of the cable anchor pier of the Oakland Bay Bridge, located on the
Embaracadero directly across from Pier 26, 10.2 feet (3.1 m) SE of the north
corner of the pier and 2 feet (0.6 m) above the ground.



                         BENCH MARK STAMPING:  V 813 1952

MONUMENTATION:           Survey Disk                               VM#:     8097
AGENCY:                                                            PID#:  HT0788
SETTING CLASSIFICATION:  Pillar of Pier


The bench mark is set vertically in the NW face of the SE pillar of the first
pier NE of thecable anchor pier of Oakland Bay Bridge, on the Embarrcadero
directly across from Pier 26, 30.5 feet (9.3 m) west of the west rail of the
Southern Pacific Company railroad track, 0.8 foot (0.2 m) SW of the north corner
of the pillar, and 2.6 feet (0.8 m) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  07/26/1983
Station ID: 9414317                                SUPERCEDED DATE:   04/21/2003
Name:       PIER 22, SAN FRANCISCO, SANFRANCISCO BAY          
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.4' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 23.2' W


                            T I D A L   D A T U M S 


Tidal datums at PIER 22, SAN FRANCISCO, SANFRANCISCO BAY based on:

     LENGTH OF SERIES:      17 MONTHS
     TIME PERIOD:           OCTOBER 1974-FEBRUARY 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9414290 SAN FRANCISCO


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (12/27/1974)         =   7.80
     MEAN HIGHER HIGH WATER                     MHHW   =   6.27
     MEAN HIGH WATER                            MHW    =   5.66
     MEAN TIDE LEVEL                            MTL    =   3.39
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   3.01
     MEAN LOW WATER                             MLW    =   1.11
   * North American Vertical Datum              NAVD88 =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/01/1975)         =  -1.80

   * NGVD reference based on adjustment of 1965 and NOS levels of1974-1976. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     179 1925                                   11.79      6.13
     TIDAL BM NO 1 1974                         16.38     10.72
     DD 109 1932                                32.04     26.37
     M 329 12.077                               15.08      9.42
     V 813 1952                                 14.54      8.88


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

                                                   PUBLICATION DATE:  07/26/1983
Station ID: 9414317                                SUPERCEDED DATE:   04/21/2003
Name:       PIER 22, SAN FRANCISCO, SANFRANCISCO BAY          
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 47.4' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 23.2' 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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