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Bench Mark Sheet for 9414837, POINT CHAUNCEY, RICHARDSON BAY CA

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


To reach the tidal bench marks proceed north along U.S. Highway 101 through
Sausalito, over Richardson Bay Bridge, right at clover leaf intersection to
Route 131, left after crossing Northwestern Pacific railroad tracks, and then
south along Paradise Drive to Point Chaunrey.  The tide gage and staff were
located on the inside of the L-shaped NOAA Southwest Marine Fisheries Pier.


                         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  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


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


                 PRIMARY BENCH MARK STAMPING:  11 1946
                         DESIGNATION:          TIDAL 11 1946

MONUMENTATION:           Tidal Station disk                    VM#:         8442
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  HT1059
SETTING CLASSIFICATION:  Concrete coping                       OPUS PID:        
LATITUDE:   37° 53.5' N (  37.89170)          LONGITUDE: 122° 26.8' W (-122.44700)


The bench mark is a disk set in top of the concrete coping forming the door
entrance to the machine and electric shop of the U.S. Naval Net Depot, at the
south corner of the shop, 33.53 m (110.0 ft) north of bench mark 10 1937, 2.07 m
(6.8 ft) west of the center of the westernmost of a group of doorways, 0.21 m
(0.7 ft) south of the SW corner of the building, and 0.18 m (0.6 ft) above the
ground.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


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


                         BENCH MARK STAMPING:  10 1937
                         DESIGNATION:          TIDAL 10 1937

MONUMENTATION:           Tidal Station disk                    VM#:         8441
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  HT1060
SETTING CLASSIFICATION:  Concrete shelf                        OPUS PID:        
LATITUDE:   37° 53.5' N (  37.89170)          LONGITUDE: 122° 26.8' W (-122.44700)


The bench mark is a disk set on a low narrow concrete shelf on the NE side of
the large abandoned gantry crane track support on the California Nautical School
ground, 55 m (160 ft) SE of the Administration Building, 33.74 m (110.7 ft)
south of the SW corner of building # 21, 8.63 m (28.3 ft) south of the north end
the gantry crane, 0.46 m (1.5 ft) north of the north face of a concrete column,
and 1.01 m (3.3 ft) above the ground. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


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


                         BENCH MARK STAMPING:  12 1946
                         DESIGNATION:          TIDAL 12 1946

MONUMENTATION:           Tidal Station disk                    VM#:         8443
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  HT1061
SETTING CLASSIFICATION:  Concrete floor                        OPUS PID:        
LATITUDE:   37° 53.4' N (  37.89000)          LONGITUDE: 122° 26.8' W (-122.44700)


The bench mark is a disk set in the concrete floor of the main entrance to the
south warehouse at the US Naval Net Depot, 237.74 m (780 ft) south of the
Administration Building, 2.26 m (7.4 ft) south of the approximate center of the
main entrance to the building, 0.21 m (0.7 ft) NW of the NW face of the steel
column of the door support, and 0.18 m (0.6 ft) NE of the NE side of the steel
door runner. 



                         BENCH MARK STAMPING:  CO RD 1975
                         DESIGNATION:          941 4837 CO RD 1975

MONUMENTATION:           Survey disk                           VM#:         8444
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   37° 53.5' N (  37.89170)          LONGITUDE: 122° 26.6' W (-122.44300)


The bench mark is a disk set horizontally in a concrete monument, 20 m (65 ft)
east of a power pole, 8 m (27 ft) north of bench mark 10 1937, and 0.15 m (0.5
ft) north of the NE corner of the concrete column at the northermost and of a
large abandoned gantry crane track support.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


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


                         BENCH MARK STAMPING:  NET HYDRO
                         DESIGNATION:          941 4837 NET HYDRO

MONUMENTATION:           Survey disk                           VM#:        12525
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID#: BBCN54
LATITUDE:   37° 53.5' N (  37.89170)          LONGITUDE: 122° 26.6' W (-122.44300)


The bench mark is a disk set in the top of the concrete seawall, 50 m (163 ft)
NW of the NW corner of the L-shaped curbing along the edge of the paved area,
and 46 m (152 ft) SE of the NW corner of the sea wall.        

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


                            T I D A L   D A T U M S 


Tidal datums at POINT CHAUNCEY, RICHARDSON BAY based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           March 1993 - July 1993
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9414290 SAN FRANCISCO, SAN FRANCISCO BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.754
     MEAN HIGH WATER                            MHW    =  1.573
     MEAN TIDE LEVEL                            MTL    =  0.953
     MEAN SEA LEVEL                             MSL    =  0.933
     MEAN LOW WATER                             MLW    =  0.333
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     11 1946                                     4.662    3.089
     10 1937                                     4.784    3.211
     12 1946                                     5.007    3.434
     CO RD 1975                                  3.917    2.344
     NET HYDRO                                   3.262    1.689


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 9414837                         PUBLICATION DATE:  03/09/2004
Name:       POINT CHAUNCEY, RICHARDSON BAY                    
            CA
NOAA Chart: 18649                           Latitude:   37° 53.5' N (  37.89170)
USGS Quad:  SAN QUENTIN                     Longitude: 122° 26.6' W (-122.44300)


                             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.

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Products available at 9414837 POINT CHAUNCEY, RICHARDSON BAY, CA

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services