U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' W
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 1.6 miles (2.6 km), take
the Foster City Boulevard exit south, turn east at the first stoplight onto
Hillsdale Boulevard, and proceed 0.6 mile (1.0 km) to the fenced parking lot for
the San Mateo County Fishing Pier on the north side of the road. The tide
station is in a concrete block building located about 0.5 mile (0.8 km) 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
MONUMENTATION: Survey Disk VM#: 8121
AGENCY: PID#: HT0579
SETTING CLASSIFICATION: Street Pavement
The bench mark is set in the NW shoulder of a paved maintenance road, 120 feet
(37 m) SW of the SW end of the San Mateo Fishing Pier, 75 feet (23 m) east of
the south corner of the SW concrete abutment of the San Mateo-Hayward toll
bridge, 50 feet (15 m) SE of the SE edge of the bridge, 13 feet (4 m) NW of the
centerline of the maintenance road, and 2.0 feet (0.6 m) SE of the NW edge of
the pavement. The mark is 0.6 foot (0.2 m) below a cast iron cover plate.
BENCH MARK STAMPING: GUANO ISLAND NO 6 1851 1967
MONUMENTATION: Survey Disk VM#: 8122
AGENCY: PID#: HT0581
SETTING CLASSIFICATION: Bridge Bent
The bench mark is set vertically in the SW side of the first concrete bent NE of
the SW bridge abutment, 62 feet (19 m) NE of the south corner of the abutment,
13 feet (4 m) NW of the SE edge of the bridge, and 0.7 foot (0.2 m) NW of the
south corner of the lower end of the bent. The mark is 3.8 feet (1.2 m) above
the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GUANO ISLAND NO 7 1851 1967
MONUMENTATION: Survey Disk VM#: 8123
AGENCY: PID#: HT2279
SETTING CLASSIFICATION: Bridge Abutment
The bench mark is set in the top of the lower end of the SW bridge abutment, 13
feet (4 m) NE of the south corner of the abutment, 2.3 feet (0.7 m) SW of a
drain pipe, and 0.3 foot (0.1 m) SW of the NE edge of the abutment. The mark is
7 feet (2 m) below the top of the concrete bridge railing.
BENCH MARK STAMPING: TIDAL BM 10 1974
MONUMENTATION: Survey Disk VM#: 8124
AGENCY: PID#: HT2282
SETTING CLASSIFICATION: Concrete Curb
The bench mark is set in the curb on the SE side of the San Mateo Fishing Pier
at the base of a concrete guardrail stanchion, and 123 feet (37 m) NE of the
intersection of the fishing piers SE curb and the extended centerline of pier 14
of the San Mateo-Hayward toll bridge. The mark is over bent 125 of the San
Mateo Fishing Pier and is 0.8 foot (0.2 m) above the pavement.
BENCH MARK STAMPING: 4458 E 1979
MONUMENTATION: Survey Disk VM#: 8125
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pier Curb
The bench mark is 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,
13.8 feet (4.2 m) south of the pier centerline. The mark is 0.9 foot (0.3 m)
above the pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4458 G 1979
MONUMENTATION: Survey Disk VM#: 8126
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is near the foot of the San Mateo Fishing Pier, 76.3 feet (23.2
m) SSE of the SW corner of the concrete railing along the south side of the
fishing pier, and 14.8 feet (4.5 m) feet 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 crimped to a steel rod driven 37 feet (11 m) to
refusal and encased in a 4-inch PVC pipe with concrete kickblock protruding 0.6
foot (0.2 m) above grade.
BENCH MARK STAMPING: 1
MONUMENTATION: Brass Disk VM#: 8127
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Deck
The bench mark is a flat 1 1/4-inch diameter brass 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,
0.13 mile (0.21 km) west of Bench Mark NO STAMPING 2, 18.2 feet (5.5 m) west of
Bent 27, 11.3 feet (3.4 m) east of Bent 26, and 1.7 feet (0.5 m) south of the
north concrete rail of the fishing pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO STAMPING 1
MONUMENTATION: Brass Pin VM#: 8128
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Curb
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, 0.2 mile (0.3 km) west of the tide house, and 0.2 mile (0.3 km) west of
Bench Mark 4458 E 1979. The bench mark is set 0.9 foot (0.3 m) above the pier
deck.
BENCH MARK STAMPING: NO STAMPING 2
MONUMENTATION: Brass Pin VM#: 8129
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Curb
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, 0.4
mile (0.6 km) west of the tide house, and 0.2 mile (0.3 km) west of Bench Mark
NO STAMPING 1. The bench mark is set 0.9 foot (0.3m) above the pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' W
T I D A L D A T U M S
Tidal datums at SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY based on:
LENGTH OF SERIES: 9 YEARS
TIME PERIOD: 1975-1978, 1981-1985
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9414750 ALAMEDA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/27/1983) = 10.76
MEAN HIGHER HIGH WATER MHHW = 7.61
MEAN HIGH WATER MHW = 6.99
MEAN TIDE LEVEL MTL = 4.08
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 3.66
MEAN LOW WATER MLW = 1.17
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/12/1985) = -2.47
* NGVD reference based on adjustment of 1976 and NOS levels of1979-1985.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
GUANO ISLAND 1851 12.20 5.21
GUANO ISLAND NO 6 1851 1967 17.02 10.03
GUANO ISLAND NO 7 1851 1967 17.77 10.78
TIDAL BM 10 1974 18.97 11.98
4458 E 1979 18.76 11.77
4458 G 1979 10.27 3.28
1 16.76 9.77
NO STAMPING 1 18.43 11.44
NO STAMPING 2 18.58 11.59
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 01/27/1987
Station ID: 9414458 SUPERCEDED DATE: 04/21/2003
Name: SAN MATEO FISHING PIER, SOUTH SANFRANCISCO BAY
CALIFORNIA
NOAA Chart: 18651 Latitude: 37° 34.8' N
USGS Quad: SANMATEO Longitude: 122° 15.2' 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 (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 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.