U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
To reach the tidal bench marks from the intersection of U.S. Highway 101 and
State Highway 92, proceed east on State Highway 92 for 2.6 km (1.6 mi), take the
Foster City Boulevard exit south, turn east at the first stoplight onto
Hillsdale Boulevard, and proceed 1.0 km (0.6 mi) to the fenced parking lot for
the San Mateo County Fishing Pier on the north side of the road. The tide
station was located in a concrete block building about 0.8 km (0.5 mi) from the
locked gate at the foot of the pier. The bench marks are located on the pier
and in the vicinity of the parking lot.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: GUANO ISLAND 1851
DESIGNATION: 941 4458 GUANO ISLAND
ALIAS: 3
MONUMENTATION: Triangulation Station disk VM#: 8121
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0579
SETTING CLASSIFICATION: Curb OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The primary bench mark is a disk set in the NW shoulder of a paved maintenance
road, 37 m (120 ft) SW of the SW end of the San Mateo Fishing Pier, 23 m (75 ft)
east of the south corner of the SW concrete abutment of the San Mateo-Hayward
toll bridge, 15 m (50 ft) SE of the SE edge of the bridge, 4 m (13 ft) NW of the
centerline of the maintenance road, and 0.61 m (2.0 ft) SE of the NW edge of the
pavement, and 0.18 m (0.6 ft) below a cast iron cover plate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GUANO ISLAND NO 6 1851 1967
DESIGNATION: GUANO ISLAND RM 6
MONUMENTATION: Reference Mark disk VM#: 8122
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0581
SETTING CLASSIFICATION: Concrete bridge pier OPUS PID:
LATITUDE: 37° 34.4' N ( 37.57330) LONGITUDE: 122° 15.7' W (-122.26200)
The bench mark is a disk set vertically in the SW side of the first concrete
pier NE of the SW bridge abutment, 19 m (62 ft) NE of the south corner of the SW
concrete abutment of the bridge, 4 m (13 ft) NW of the SE edge of the bridge,
0.21 m (0.7 ft) NW of the south corner of the lower end of the peir, and 1.16 m
(3.8 ft) above the ground.
BENCH MARK STAMPING: 4458 E 1979
DESIGNATION: 941 4458 E
MONUMENTATION: Tidal Station disk VM#: 8125
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pier curb OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk set in the curb on the south side of the San Mateo
Fishing Pier at the base of a concrete guardrail between Bents 109 and 110 of
the pier, 4.21 m (13.8 ft) south of the pier centerline, and 0.27 m (0.9 ft)
above the pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4458 G 1979
DESIGNATION: 941 4458 G
MONUMENTATION: Tidal Station disk VM#: 8126
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk located near the foot of the San Mateo Fishing Pier,
23.26 m (76.3 ft) SSE of the SW corner of the concrete railing along the south
side of the fishing pier, and 4.51 m (14.8 ft) NE of the north post of the gate
to a fence running north-south from the south corner of the fishing pier to the
parking lot. The mark is set 18 cm (0.6 ft) above grade, crimped to a
galvanized steel rod driven 11.3 m (37 ft) to refusal and encased in a 4-inch
PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1
DESIGNATION: 941 4458 Q TIDAL
ALIAS: Q 1983
MONUMENTATION: Tidal Station disk VM#: 8127
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID#: BBCQ91
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk set flush in the concrete deck of the San Mateo Fishing
Pier, on line with the east end of the first inshore bridge abutment for the San
Mateo-Hayward Bridge on Highway 92, 23.98 m (78.7 ft) west of bench mark 941
4458 P, 5.55 m (18.2 ft) west of Bent 27, 3.44 m (11.3 ft) east of Bent 26, and
0.52 m (1.7 ft) south of the north concrete rail of the fishing pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 941 4458 N
ALIAS: NO STAMPING 1, N 1983
MONUMENTATION: See descriptive text VM#: 8128
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a 3/4-inch round brass pin set in the concrete curb on the
south side of the San Mateo Fishing Pier at Bent 80, on the range with the
extended centerline of piers 8 and 9 of the San Mateo-Hayward Bridge on Highway
92, 38.91 m (127.7 ft) west of the tide house, and 30 m (98 ft) west of bench
mark 4458 E 1979, and 0.27 m (0.9 ft) above the pier deck.
BENCH MARK STAMPING:
DESIGNATION: 941 4458 P
ALIAS: NO STAMPING 2, P 1983
MONUMENTATION: See descriptive text VM#: 8129
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a 3/4-inch round brass pin set in the concrete curb on the
south side of the San Mateo Fishing Pier at Bent 50, on range with the extended
centerline of piers 4 and 5 of the San Mateo-Hayward Bridge on Highway 92, 69.39
m (227.7 ft) west of the tide house, and 30.48 m (100 ft) west of bench mark 941
4458 N TIDAL and 0.27 m (0.9 ft) above the pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4458 R 1986
DESIGNATION: 941 4458 R
MONUMENTATION: Tidal Station disk VM#: 8131
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk set in concrete under the new San Mateo Bridge by a
metal roll up door on the east side of the underpass, 15.82 m (51.9 ft) east of
the chain-link roll gate access to the State of California storage area, 13.75 m
(45.1 ft) south of the NW corner of the eastern bridge support structure that
houses office space, 12.71 m (41.7 ft) north of the SW corner of the same bridge
support structure, 6.95 m (22.8 ft) east of the centerline of the road in the
underpass, and 0.21 m (0.7 ft) west of the metal roll up door.
BENCH MARK STAMPING: 4458 S 1986
DESIGNATION: 941 4458 S 1986
MONUMENTATION: Tidal Station disk VM#: 8132
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk located in the bank along the south side of the access
road to the station, 73.15 m (240.0 ft) east from bench mark 4458 T 1986, 52.73
m (173.0 ft) west from the sign posted "Warning Stop Ahead", 27.13 m (89.0 ft)
south from the blue road service call box sign, 7.62 m (25.0 ft) south from the
center of the access road, and 0.12 m (0.4 ft) north of an orange NOS witness
post. The bench mark is crimped to a 9/16-inch stainless steel rod, driven 10 m
(33 ft) to refusal, and set under an aluminum access cover in concrete to
protect mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4458 T 1986
DESIGNATION: 941 4458 T 1986
MONUMENTATION: Tidal Station disk VM#: 8133
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 37° 34.8' N ( 37.58000) LONGITUDE: 122° 15.2' W (-122.25300)
The bench mark is a disk located on the south side of the access road to the
station, 73 m (240 ft) west of bench mark 4458 S 1986, 67 m (220 ft) east of the
sign posted "Pumping Prohibited" on the south side of the access road, 32 m (106
ft) south from light pole No. 1L2C6 which is adjacent and east from the blue
road service call box sign, 7.80 m (25.6 ft) south from the center line of the
access road, and 0.12 m (0.4 ft) north of an orange NOS witness post. The bench
mark is crimped to a 9/16-inch stainless steel rod, driven 23.2 m (76 ft) to
refusal, and set under an aluminum access cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
T I D A L D A T U M S
Tidal datums at SAN MATEO BRIDGE, WEST SIDE based on:
LENGTH OF SERIES: 7 Years
TIME PERIOD: January 1981 - December 1987
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 (01/27/1983) = 3.264
MEAN HIGHER HIGH WATER MHHW = 2.354
MEAN HIGH WATER MHW = 2.160
MEAN TIDE LEVEL MTL = 1.261
MEAN SEA LEVEL MSL = 1.253
MEAN LOW WATER MLW = 0.362
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/19/1988) = -0.881
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
GUANO ISLAND 1851 3.703 1.543
GUANO ISLAND NO 6 1851 1967 5.173 3.013
4458 E 1979 5.704 3.544
4458 G 1979 3.115 0.955
1 5.092 2.932
941 4458 N 5.602 3.442
941 4458 P 5.649 3.489
4458 R 1986 3.519 1.359
4458 S 1986 3.869 1.709
4458 T 1986 2.756 0.596
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 9414458 PUBLICATION DATE: 05/15/2003
Name: SAN MATEO BRIDGE, WEST SIDE
CA
NOAA Chart: 18651 Latitude: 37° 34.8' N ( 37.58000)
USGS Quad: SAN MATEO Longitude: 122° 15.2' W (-122.25300)
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.