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Bench Mark Sheet for 9415320, REYNOLDS, TOMALES 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


To reach the tidal bench marks from Marshall, CA, go 0.3 km   (0.2 mi) south of
the post office in Marshall on State Highway 1, pass Marshall Tavern and go to
Tony's Seafood Restaurant Wharf.  The bench amrks were located along the State
Highway 1 in the vicinity.  The tide gauge was located on the Tony's Seafood
Restaurant Wharf. 


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


                 PRIMARY BENCH MARK STAMPING:  5320 A 1994
                         DESIGNATION:          941 5320 A

MONUMENTATION:           Tidal Station disk                    VM#:        12519
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete culvert head wall            OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The primary bench mark is a disk set flush in top of a concrete culvert headwall
at milepost 37.09 on the NE side of U.S. Highway One, SE of Marshall,
California, 10.42 m (34.2 ft) SW of utility pole #272, 4.18 m (13.7 ft) SSE of
center line of U.S. Highway One, 1.62 m (5.3 ft) nw of the milepost 37.09 on NE
side of U.S. Highway One, and 0.06 m (0.2 ft) below road level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


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


                         BENCH MARK STAMPING:  5320 B 1994
                         DESIGNATION:          941 5320 B

MONUMENTATION:           Tidal Station disk                    VM#:        12520
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete culvert head wall            OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark Is a disk set flush in a concrete culvert headwall at milepost
37.38 on the NE side of U.S. Highway One, across from the Marshall Boat Works at
Marshall, California, 18.14 m (59.5 ft) SE of the stop sign at the U.S. Post
Office, 5.52 m (18.1 ft) NE of the center line of U.S. Highway One, 1.52 m (5.0
ft) north of milepost 37.38 on NE side of U.S. Highway One, and 0.61 m (2.0 ft)
below road level.



                         BENCH MARK STAMPING:  5320 C 1994
                         DESIGNATION:          941 5320 C

MONUMENTATION:           Tidal Station disk                    VM#:        12521
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete culvert head wall            OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark is a disk set flush in the top of a concrete culvert headwall at
milepost 37.62 on the NE side of U.S. Highway One at Marshall, California, 27.28
m (89.5 ft) east of utility pole # 289 with transformer, 5.88 m (19.3 ft) NE of
the center line of U.S. Highway One, 0.30 m (1.0 ft) NE of milepost 37.62 on NE
side of U.S. Highway One, and 0.15 m (0.5 ft) NW of the east end of the
headwall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


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


                         BENCH MARK STAMPING:  71 FMK 1975
                         DESIGNATION:          941 5320 71 FMK

MONUMENTATION:           Bench Mark disk                       VM#:        12522
AGENCY:                  US Department of Interior (DI)        IDB PID#:        
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark is a disk set flush in top of a concrete culvert headwall at
milepost 36.90 on the NE side of U.S. Highway One, SE of Marshall, California,
10.27 m (33.7 ft) south of utility pole # 266 with transformer, 5.03 m (16.5 ft)
NE of the center line of U.S. Highway One, 1.68 m (5.5 ft) north of milepost
36.90, and 0.21 m (0.7 ft) NW of SE end of headwall.



                         BENCH MARK STAMPING:  76 FMK 1975
                         DESIGNATION:          941 5320 76 FMK

MONUMENTATION:           Bench Mark disk                       VM#:        12523
AGENCY:                  US Department of Interior (DI)        IDB PID#:        
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark is a disk set flush in top of a concrete culvert headwall at
milepost 37.93 on the NE side of U.S. Highway One in Marshall, California, 35.87
m (117.7 ft) SE of power pole # 298 with tansformer, 5.49 m (18.0 ft) east of
center line of U.S. Highway One, 0.30 m (1.0 ft) north of milepost 37.93 on U.S.
Highway One, and 0.30 m (1.0 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


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


                         BENCH MARK STAMPING:  77 FMK 1975
                         DESIGNATION:          941 5320 77 FMK

MONUMENTATION:           Bench Mark disk                       VM#:        12524
AGENCY:                  US Department of Interior (DI)        IDB PID#:        
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark is a disk set flush in top of a concrete culvert headwall at
milepost 38.03 on the NE side of U.S. Highway One, 11.43 m (37.5 ft) ENE of
utility pole # 300, 4.57 m (15.0 ft) east of the center line of U.S. Highway
One, and 0.61 m (2.0 ft) north of milepost 38.03 on U.S. Highway One.



                         BENCH MARK STAMPING:  NO 1 1931
                         DESIGNATION:          941 5320 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        13561
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   38°  8.8' N (  38.14670)          LONGITUDE: 122° 53.0' W (-122.88300)


The bench mark is a disk set in a rock located NW side of the bight forming the
harbor of Marshall, 156 m (513 ft) west of bridge crossing slough, 48 m (157 ft)
NE of the large offlying rock, 6 m (20 ft) south of the old rail road bed, and
about 1 m (2 ft) above the apparent high water line.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


                            T I D A L   D A T U M S 


Tidal datums at REYNOLDS, TOMALES BAY based on:

     LENGTH OF SERIES:      2 Months
     TIME PERIOD:           April 1994 - May 1994
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9415020 POINT REYES, DRAKES BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.649
     MEAN HIGH WATER                            MHW    =  1.427
     MEAN TIDE LEVEL                            MTL    =  0.859
     MEAN SEA LEVEL                             MSL    =  0.838
     MEAN LOW WATER                             MLW    =  0.290
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5320 A 1994                                 4.023    2.596
     5320 B 1994                                 3.024    1.597
     5320 C 1994                                 3.012    1.585
     71 FMK 1975                                 2.253    0.826
     76 FMK 1975                                 3.567    2.140
     77 FMK 1975                                 3.065    1.638
     NO 1 1931                                   1.937    0.510


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

                                                                                
Station ID: 9415320                         PUBLICATION DATE:  04/21/2003
Name:       REYNOLDS, TOMALES BAY                             
            CA
NOAA Chart: 18643                           Latitude:   38°  8.8' N (  38.14670)
USGS Quad:  Tomales                         Longitude: 122° 53.0' W (-122.88300)


                             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 9415320 REYNOLDS, TOMALES BAY, CA

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