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Superseded Bench Mark Sheet for 9414358, HUNTERS POINT, S.F. BAY CA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:  06/24/1983
Station ID: 9414358                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTERS POINT, SAN FRANCISCO BAY                  
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 43.8' N
USGS Quad:  HUNTERSPOINT                           Longitude:       122° 21.4' W


To reach the tidal bench marks from I-280 and U.S. Highway 101 interchange
proceed 1.4 miles (2.2 km) south to Bayshore Blvd., Third Street exit, left onto
Third Street, north 1.8 miles (2.9 km) to Evans Street, right turn on Evans
Street, 0.7 mile (1.1 km) SE on Evans Street, one block south on Evans Street to
Fairfax Street, right on Hunters Point Boulevard, 0.2 mile (0.3 km) after left
turn on Innes Avenue and then 0.4 mile (0.6 km) to entrance to guard house with
dry dock area at bottom of hill.  The tide gage was located 50 feet (15.2 m) NW
of NW corner of drydock No. 2 and the staff was located on an adjacent pier.


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


                 PRIMARY BENCH MARK STAMPING:  HUNTERS POINT BM 2 1917

MONUMENTATION:           Survey Disk                               VM#:     8098
AGENCY:                                                            PID#:  HT0619
SETTING CLASSIFICATION:  Wall


The bench mark is set vertically in west wall at the NW corner of the small
brick pump house (Building No. 204), between drydocks No. 2 and 3, 100 feet
(30.5 m) east of center of capstan at SE corner of drydock No. 3, 64 feet (19.5
m) east of SE corner of south end of caisson of drydock, No. 2, and 0.5 foot
(0.2 m) above the paved ground.



                         BENCH MARK STAMPING:  HUNTERS POINT BM 3 1917

MONUMENTATION:           Survey Disk                               VM#:     8099
AGENCY:                                                            PID#:  HT0618
SETTING CLASSIFICATION:  Wall


The bench mark is set veritically on south wall of brick boiler room C building
No. 205, between drydocks No. 2 and 3, 100 feet (30.5 m) east of SW corner of
boiler room building, 35 feet (10.7 m) north of north edge of drydock No. 2 and
15 feet (4.6 m) east of the centerline of the door at center of the boiler room
wall.

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

                                                   PUBLICATION DATE:  06/24/1983
Station ID: 9414358                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTERS POINT, SAN FRANCISCO BAY                  
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 43.8' N
USGS Quad:  HUNTERSPOINT                           Longitude:       122° 21.4' W


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


                         BENCH MARK STAMPING:  4 1941

MONUMENTATION:           Survey Disk                               VM#:     8100
AGENCY:                                                            PID#:  HT0616
SETTING CLASSIFICATION:  Concrete Platform


The bench mark is set in top of SE corner of concrete loading platform at NE
corner of large concrete machine shop Building No. 231, 96 feet (29.3 m) south
of south side of drydock, No. 2, 0.5 foot (0.2 m) north of north wall of the
building, and 3.4 feet (1.0 m) above the pavement.



                         BENCH MARK STAMPING:  5 1941

MONUMENTATION:           Survey Disk                               VM#:     8101
AGENCY:                                                            PID#:  HT0615
SETTING CLASSIFICATION:  Concrete Platform


The bench mark is set on top of NW corner of concrete loading platform at the SW
corner of the large concrete machine shop, Building No. 231, 260 feet (79.2 m)
south of drydock No. 2, 0.5 foot (0.2 m) south of south wall of building, and 3
feet (0.9 m) above the pavement.



                         BENCH MARK STAMPING:  HUNTER WEST 1 1941

MONUMENTATION:           Survey Disk                               VM#:     8102
AGENCY:                                                            PID#:  HT0613
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set in a concrete post at the head of drydock, No. 2, covered
with a steel handhole and cover plate, 108 feet (32.9 m) south by east of center
of capstan at head of drydock, 95 feet (29 m) west by north of fireplug on south
side and near west end of drydock, 6 feet (1.8 m) west of inner rail of 50 ton
crane, and 0.7 foot (0.2 m) below the pavement.

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

                                                   PUBLICATION DATE:  06/24/1983
Station ID: 9414358                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTERS POINT, SAN FRANCISCO BAY                  
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 43.8' N
USGS Quad:  HUNTERSPOINT                           Longitude:       122° 21.4' W


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


                         BENCH MARK STAMPING:  HUNTER EAST 1941

MONUMENTATION:           Survey Disk                               VM#:     8103
AGENCY:                                                            PID#:  HT0620
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set in the subsurface concrete retaining wall with a steel
handhole and coverplate stamped SFWD over the mark at yard level, 96 feet (29.3
m) west of SW end of drydock caisson, 64 feet (19.5 m) west by north of center
of capstan at SE end of drydock, 18 feet (5.5 m) south of south side of drydock,
and 0.8 foot (0.2 m) below the pavement of yard.

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

                                                   PUBLICATION DATE:  06/24/1983
Station ID: 9414358                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTERS POINT, SAN FRANCISCO BAY                  
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 43.8' N
USGS Quad:  HUNTERSPOINT                           Longitude:       122° 21.4' W


                            T I D A L   D A T U M S 


Tidal datums at HUNTERS POINT, SAN FRANCISCO BAY based on:

     LENGTH OF SERIES:      13 MONTHS
     TIME PERIOD:           NOV 1974-FEB 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9414760 ALAMEDA, CA


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

     HIGHEST OBSERVED WATER LEVEL (12/27/1974)         =   8.16
     MEAN HIGHER HIGH WATER                     MHHW   =   6.73
     MEAN HIGH WATER                            MHW    =   6.10
     MEAN TIDE LEVEL                            MTL    =   3.61
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   3.12
     MEAN LOW WATER                             MLW    =   1.12
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/01/1975)         =  -1.86

   * NGVD reference based on adjustment of 1958 and NOS levels of1974-1976. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     HUNTERS POINT BM 2 1917                    11.88      5.78
     HUNTERS POINT BM 3 1917                    12.14      6.04
     4 1941                                     15.33      9.23
     5 1941                                     15.38      9.28
     HUNTER WEST 1 1941                         11.32      5.22
     HUNTER EAST 1941                           10.65      4.55


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

                                                   PUBLICATION DATE:  06/24/1983
Station ID: 9414358                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTERS POINT, SAN FRANCISCO BAY                  
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 43.8' N
USGS Quad:  HUNTERSPOINT                           Longitude:       122° 21.4' 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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Products available at 9414358 HUNTERS POINT, S.F. BAY, CA

Revised: 08/08/2018
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