U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' W
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) PID#: HT2319
SETTING CLASSIFICATION: Curb
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) and 0.2 m
(0.7 ft) above the pavement.
BENCH MARK STAMPING: 4508 A 1997
DESIGNATION: 941 4508 A
MONUMENTATION: Tidal Station disk VM#: 13852
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Unspecified deep rod
The bench mark is a disk 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 a rod driven 15.5 m (51 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4508 B 1997
DESIGNATION: 941 4508 B
MONUMENTATION: Tidal Station disk VM#: 13853
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Unspecified deep rod
The bench mark is a disk 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 a rod driven 18.3 m
(60 ft) to refusal.
BENCH MARK STAMPING: BM 4508 C 1997
DESIGNATION: 941 4508 C
MONUMENTATION: Tidal Station disk VM#: 13854
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete pad
The bench mark is a disk 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.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4508 D 1997
DESIGNATION: 941 4508 D
MONUMENTATION: Tidal Station disk VM#: 13855
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Street
The bench mark is a disk set in the south side of the median strip in the middle
of Herkner Road at the entrance to the port of Redwood City, 18.30 m ( 60.0 ft)
south of the SE corner of the Port of Redwood City office building, 15.15 m
(49.7 ft) west of the east end of the concrete median strip, 2.17 m (7.1 ft)
east of the SE corner of the guard shack, and 0.90 m (2.9 ft) south of a flag
pole.
BENCH MARK STAMPING: WHARF 4 1985
DESIGNATION: 941 4523 WHARF 4
MONUMENTATION: Bench Mark disk VM#: 13856
AGENCY: US Geological Survey (USGS) PID:
SETTING CLASSIFICATION: Sea wall
The bench mark is a disk 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 2nd 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 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' W
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) PID:
SETTING CLASSIFICATION: Curb
The bench mark is a disk 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) PID:
SETTING CLASSIFICATION: Sea wall
The bench mark is a disk 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 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' W
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: 6 Years
TIME PERIOD: November 1997 - October 2002
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) = 3.310
MEAN HIGHER HIGH WATER (MHHW) = 2.506
MEAN HIGH WATER (MHW) = 2.313
MEAN SEA LEVEL (MSL) = 1.345
MEAN TIDE LEVEL (MTL) = 1.339
MEAN LOW WATER (MLW) = 0.365
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (12/24/1999) = -0.785
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL BM 13 1974 3.960 1.647
4508 A 1997 2.810 0.497
4508 B 1997 2.071 -0.242
BM 4508 C 1997 3.901 1.588
4508 D 1997 2.362 0.049
WHARF 4 1985 4.639 2.326
4508 T 1998 4.127 1.814
4508 U 1998 3.560 1.247
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9414523 PUBLICATION DATE: 04/21/2003
Name: REDWOOD CITY, WHARF 5, S. F. BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 30.4' N
USGS Quad: Redwood Point Longitude: 122° 12.6' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.