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Bench Mark Sheet for 9414523, Redwood City 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


To reach the tidal bench marks from U.S. Highway 101 exit at Seaport Boulevard
to Port of Redwood City, go 1.6 km (1 mi) NE of the freeway on the Seaport
Boulevard to the entrance gate to Wharf No 5 near the SW end of the port.  The
bench marks are in the general vicinity along the coast.  The tide gage is
located on the pier.


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


                 PRIMARY BENCH MARK STAMPING:  TIDAL BM 13 1974
                         DESIGNATION:          941 4523 TIDAL 13

MONUMENTATION:           Tidal Station disk                    VM#:         8320
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  HT2319
SETTING CLASSIFICATION:  Curb                                  OPUS PID:        
LATITUDE:   37° 30.4' N (  37.50678)          LONGITUDE: 122° 12.7' W (-122.21153)


The primary bench mark is a disk set flush in top of the south curb of the
central one of three concrete ramps leading to Wharf 5, 28.83 m ( 94.6 ft) ESE
of the shoreward face of the Wharf, 22.46 m (73.7 ft) SW of the SW corner of the
metal office/restroom building (shoreward of north end of Wharf 5), 1.8 m (  6
ft) east of the gate post for middle entrance to the pier and 0.2 m (0.7 ft)
above the pavement.    

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


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


                         BENCH MARK STAMPING:  4508 A 1997
                         DESIGNATION:          941 4508 A

MONUMENTATION:           Tidal Station disk                    VM#:        13852
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID#: BBBF96
LATITUDE:   37° 30.5' N (  37.50861)          LONGITUDE: 122° 12.6' W (-122.21033)


The bench mark is a located west of post office at south of bend in Kerkner
Road, 8 m (26 ft) east of centerline of north/south running segment of Herkner
Road, 5.30 m (17.4 ft) SW of center of railroad tracks, 4.91 m (16.1 ft)  NE of
a fence with witness sign attached.  The bench mark is set  0.20 m (0.7 ft)
below ground level, crimped to the top of a rod driven 15.5 m (51 ft) to
refusal.



                         BENCH MARK STAMPING:  4508 B 1997
                         DESIGNATION:          941 4508 B

MONUMENTATION:           Tidal Station disk                    VM#:        13853
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   37° 30.4' N (  37.50733)          LONGITUDE: 122° 12.6' W (-122.20925)


The bench mark is a located at the SW corner of the intersection of the Seaport
Boulevard and Herkner Road, south of the post office, 20.70 m (67.9 ft) west of
center of Seaport Boulevard, 5.70 m (18.7 ft) west of center of railroad tracks,
2 m (7 ft) east of a fence with witness sign attached.  The bench mark is set 
0.10 m (0.3 ft) below ground level, and crimped to the top of a rod driven 18.3
m (60 ft) to refusal.

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

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


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


                         BENCH MARK STAMPING:  BM 4508 C 1997
                         DESIGNATION:          941 4508 C

MONUMENTATION:           Tidal Station disk                    VM#:        13854
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   37° 30.5' N (  37.50797)          LONGITUDE: 122° 12.7' W (-122.21086)


The bench mark is a set in the SE corner of a 1.35 m x 1.35 m (4.4 ft x 4.4 ft)
concrete block supporting a bollard located between wharfs 4 and 5 at the Port
of Redwood City, 15.20 m (49.9 ft) west of junction of two railroad tracks,
10.12 m (33.2 ft) east of the concrete breakwater, 5.48 m (18.0 ft) north of a
yellow fire plug with four yellow guard posts, and 0.50 m (1.6 ft) above ground
level.



                         BENCH MARK STAMPING:  WHARF 4 1985
                         DESIGNATION:          941 4523 WHARF 4

MONUMENTATION:           Bench Mark disk                       VM#:        13856
AGENCY:                  US Geological Survey (USGS)           IDB PID#:        
SETTING CLASSIFICATION:  Sea wall                              OPUS PID:        
LATITUDE:   37° 30.6' N (  37.50939)          LONGITUDE: 122° 12.7' W (-122.21167)


The bench mark is a set into the seaward bullrail on north end of catwalk
leading to southern dolphin on wharf 4, 5.80 m (19.0 ft) south of high voltage
box "E2", 2.20 m (7.2 ft) south of the second southernmost bollard, 1.70 m (5.6
ft) from western wharf face, and 0.30 m (1.0 ft) above wharf deck.

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

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


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


                         BENCH MARK STAMPING:  4508 T 1998
                         DESIGNATION:          941 4508 T

MONUMENTATION:           Tidal Station disk                    VM#:        14824
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Curb                                  OPUS PID:        
LATITUDE:   37° 30.4' N (  37.50739)          LONGITUDE: 122° 12.7' W (-122.21125)


The bench mark is a set in the south curb of the northern most ramp leading to
Wharf 5 at the Port of Redwood City, 14.60 m (47.9 ft) west of a light pole
leading to the pier, 10.0 m (32.8 ft) NW of SE end of curb, and 4.6 m (15.1 ft)
south of center of ramp.



                         BENCH MARK STAMPING:  4508 U 1998
                         DESIGNATION:          941 4508 U

MONUMENTATION:           Tidal Station disk                    VM#:        14825
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Sea wall                              OPUS PID:        
LATITUDE:   37° 30.6' N (  37.51017)          LONGITUDE: 122° 12.7' W (-122.21089)


The bench mark is a set in a sea wall near a boat ramp at the Port of Redwood
City between Wharfs 4 and 5, 15.24 m (50.0 ft) west of center of road leading to
the Wharf 4, 5.50 m (18.0 ft) east of center of boat ramp, and 4.90 m (16.1 ft)
south of the north end of the sea wall.

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

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


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


                         BENCH MARK STAMPING:  4523 A 2009
                         DESIGNATION:          945 4523 A

MONUMENTATION:           Metal Rod                             VM#:        19575
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 30.5' N (  37.50764)          LONGITUDE: 122° 12.5' W (-122.20914)


The benchmark is set on the south side of Herkner Road, 20.8 m (68.2 ft) East of
the railroad switch along the South side of Hernker Road, 5.48 m (18.0 ft) South
of the center of Herkner Road, 3.0 m (9.8 ft) North of the center of the Port of
Redwood City railroad tracks, and 0.17 m (0.6 ft) North of the orange NOAA
witness marker. The bench mark is driven  17.1 m (56 ft) to refusal, encased in
a 5-inch NOS logo cap.

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

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


                            T I D A L   D A T U M S 


Tidal datums at REDWOOD CITY, WHARF 5, S. F. BAY based on:

     LENGTH OF SERIES:      14 YEARS
     TIME PERIOD:           October 1997 - September 2011
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9414750 ALAMEDA, SAN FRANCISCO BAY


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

     HIGHEST OBSERVED WATER LEVEL (12/03/1983)         =  3.293
     MEAN HIGHER HIGH WATER                     MHHW   =  2.501
     MEAN HIGH WATER                            MHW    =  2.308
     MEAN SEA LEVEL                             MSL    =  1.342
     MEAN TIDE LEVEL                            MTL    =  1.337
     MEAN LOW WATER                             MLW    =  0.366
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/11/2009)         = -0.844

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     TIDAL BM 13 1974                            3.943    1.635
     4508 A 1997                                 2.791    0.483
     4508 B 1997                                 2.052   -0.256
     BM 4508 C 1997                              3.885    1.577
     WHARF 4 1985                                4.621    2.313
     4508 T 1998                                 4.110    1.802
     4508 U 1998                                 3.540    1.232
     4523 A 2009                                 2.328    0.020


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

                                                                                
Station ID: 9414523                         PUBLICATION DATE:  12/06/2011
Name:       REDWOOD CITY, WHARF 5, S. F. BAY                  
            CA
NOAA Chart: 18651                           Latitude:   37° 30.4' N (  37.50670)
USGS Quad:  REDWOOD POINT                   Longitude: 122° 12.6' W (-122.21000)


                             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 9414523 Redwood City, CA

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