Superseded Bench Mark Sheet for 9414819, SAUSALITO, COE DOCK, S.F. BAY CA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  4

                                                   PUBLICATION DATE:  02/20/1985
Station ID: 9414819                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, COE DOCK, RICHARDSON BAY, SAN FRANCISCO
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 51.9' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 29.6' W


To reach the tidal bench marks in Sausalito, proceed east along Bridgeway Street
and then along Marinship Way to the U.S. Army Corps of Engineers (COE) San
Francisco Bay Model building facilities.  The bench marks are along Bridgeway
and east of the Corps of Engineers soil lab building and the tide gage and staff
were on the east side of the inshore portion of the Corps of Engineers dock.


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


                 PRIMARY BENCH MARK STAMPING:  SAUSALITO NO 2 1917

MONUMENTATION:           Survey Disk                               VM#:     8431
AGENCY:                                                            PID#:  HT1070
SETTING CLASSIFICATION:  Face of Building


The bench mark is set vertically in the NW brick face of the Caledonia Market
building at the east corner of the intersection of Pine and Caledonia Streets,
6.0 feet (1.8 m) NE of the west corner of the building, and 1.0 foot (0.3 m)
above the sidewalk.



                         BENCH MARK STAMPING:  32 1948

MONUMENTATION:           Survey Disk                               VM#:     8432
AGENCY:                                                            PID#:  HT1067
SETTING CLASSIFICATION:  Concrete Slab


The bench mark is set in top of the south corner of a concrete slab, 39.8 feet
(12.1 m) SE of the south corner of the laboratory storage building, 36.5 feet
(11.1 m) NE of the east corner of a chain link fence at the Corps of Engineers
laboratory yard, 14 feet (4 m) NW of the projected centerline of the road, 11.5
feet (3.5 m) NE of the NE rail of a spur track, 0.5 foot (0.2 m) north of the
south corner of the slab, and flush with the ground.

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

                                                   PUBLICATION DATE:  02/20/1985
Station ID: 9414819                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, COE DOCK, RICHARDSON BAY, SAN FRANCISCO
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 51.9' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 29.6' W


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


                         BENCH MARK STAMPING:  33 1948

MONUMENTATION:           Survey Disk                               VM#:     8433
AGENCY:                                                            PID#:  HT1066
SETTING CLASSIFICATION:  Concrete Slab


The bench mark is set in top of a concrete slab at the center of an asphalt
road, at the crossing of a spur track, 60.6 feet (18.5 m) south of Bench Mark 32
1948, 44.0 feet (13.4 m) SE of the SE rail of a spur track, 34.7 feet (10.6 m)
south of the east fence corner of a chain link fence at the Corps of Engineers
laboratory yard, 30.0 feet (9.1 m) NW of the fence line, and flush with the
ground.



                         BENCH MARK STAMPING:  LS 3221 (4819 C)

MONUMENTATION:           Survey Disk                               VM#:     8434
AGENCY:                                                            PID#:  HT3535
SETTING CLASSIFICATION:  Pavement


The bench mark is located in the center of the intersection of Napa Street and
Bridgeway Avenue, under an iron cover marked MONUMENT,  15 feet (5 m) south of
concrete divider, and 1.0 foot (0.3 m) below the pavement.  (Designated 4819 C)



                         BENCH MARK STAMPING:  LS 3221 (4819 D)

MONUMENTATION:           Survey Disk                               VM#:     8435
AGENCY:                                                            PID#:  HT3536
SETTING CLASSIFICATION:  Pavement


The bench mark is in the center of the intersection of Litho Street and
Bridgeway Avenue, under an iron cover marked MONUMENT,  15 feet (5 m) south of a
concrete divider, and 1.0 foot (0.3 m) below the pavement.  (Designated 4819 D)

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

                                                   PUBLICATION DATE:  02/20/1985
Station ID: 9414819                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, COE DOCK, RICHARDSON BAY, SAN FRANCISCO
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 51.9' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 29.6' W


                            T I D A L   D A T U M S 


Tidal datums at SAUSALITO, COE DOCK, RICHARDSON BAY, SAN FRANCISCO based on:

     LENGTH OF SERIES:      8 MONTHS
     TIME PERIOD:           SEPTEMBER 1978-APRIL 1979
     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 (12/30/1978)         =   7.09
     MEAN HIGHER HIGH WATER                     MHHW   =   5.73
     MEAN HIGH WATER                            MHW    =   5.14
     MEAN TIDE LEVEL                            MTL    =   3.13
     MEAN LOW WATER                             MLW    =   1.13
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/27/1979)         =  -1.56

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     SAUSALITO NO 2 1917                        16.46     11.32
     32 1948                                    11.79      6.65
     33 1948                                    11.69      6.55
     LS 3221 (4819 C)                           12.15      7.01
     LS 3221 (4819 D)                            8.84      3.70


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

                                                   PUBLICATION DATE:  02/20/1985
Station ID: 9414819                                SUPERCEDED DATE:   04/21/2003
Name:       SAUSALITO, COE DOCK, RICHARDSON BAY, SAN FRANCISCO
            CALIFORNIA
NOAA Chart: 18649                                  Latitude:         37° 51.9' N
USGS Quad:  SAN FRANCISCO NORTH                    Longitude:       122° 29.6' 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.

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