U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
To reach the tidal bench marks from the Railroad Avenue exit of Highway 4 in
Pittsburg, proceed NNE on Railroad Avenue to Third Street, then turn right and
proceed east on Third Street for 1.5 blocks, then turn left into the dirt
parking lot opposite the John S. Manville Plant. The bench marks are located
along Railroad Avenue and along the Southern Pacific railroad tracks. The tide
gage and staff were located on the Diablo Service Corporation mooring wharf on
the west reach of New York Slough.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 4 1937
DESIGNATION: TIDAL 4 STA III 32
MONUMENTATION: Tidal Station disk VM#: 8535
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JS1881
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 38° 1.9' N ( 38.03170) LONGITUDE: 121° 53.0' W (-121.88300)
The primary bench mark is a disk set in top of the south end of the top concrete
step at the post office leading to the basement on the north side of the
building, 8 m (27 ft) east of the NW corner of the building, 12 cm (0.4 ft)
north of the north wall, and 0.3 m (1 ft) above the road.
BENCH MARK STAMPING: 5096 A 1979
DESIGNATION: 941 5096 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 8536
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 2.2' N ( 38.03670) LONGITUDE: 121° 52.8' W (-121.88000)
The bench mark is a disk located on the Diablo Service Corporation property,
41.1 m (135 ft) NNW of the corner of the chain link fence at the east end of
First Street, 7 m (23 ft) SSE of the shore and a small dock with concrete deck,
and 0.46 m (1.5 ft) SSW of a power pole. The bench mark is crimped to the top
of a copper-coated steel rod driven 7.3 m (24 ft) to refusal and encased in a
PVC pipe projecting 0.46 m (1.5 ft) above the grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5096 B 1979
DESIGNATION: 941 5096 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 8537
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Building ledge OPUS PID:
LATITUDE: 38° 2.2' N ( 38.03670) LONGITUDE: 121° 52.8' W (-121.88000)
The bench mark is a disk set in the top of the ledge on the north side of the
old bank building, 24.84 m (81.5 ft) ESE of the centerline of Railroad Avenue, 8
m (25 ft) SSW of the centerline of Fourth Street, 2.4 m (8 ft) WSW of the NE
corner of the building, and 1 m (2 ft) above the sidewalk.
BENCH MARK STAMPING: 5096 D 1979
DESIGNATION: 941 5096 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 8538
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 2.2' N ( 38.03670) LONGITUDE: 121° 52.8' W (-121.88000)
The bench mark is a disk located in the back of the parking lot in an island at
the Pittsburg Post Office at 835 Railroad Avenue, 24 m (79 ft) SSW of the SW
corner of the post office, 13 m (43 ft) ESE of the centerline of Railroad
Avenue, and 0.37 m (1.2 ft) SSW of the driveway curb. The bench mark is crimped
on top of a copper-coated steel rod driven 4.0 m (13 ft) to refusal and encased
in a PVC pipe projecting 15 cm (0.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: R 10 1930
DESIGNATION: R 10 USGS
MONUMENTATION: Survey disk VM#: 8539
AGENCY: US Geological Survey (USGS) IDB PID#: JS1883
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 38° 1.4' N ( 38.02330) LONGITUDE: 121° 53.1' W (-121.88500)
The bench mark is a disk set in top of the concrete retaining wall along the
north side of the Southern Pacific Company Railroad tracks, 16.61 m (54.5 ft)
east of milepole 49, 9.69 m (31.8 ft) north of the north rail of the main track,
5 m (16 ft) east of a large pole for the loading crane, 1.49 m (4.9 ft) west of
the east end of the retaining wall, and 1.07 m (3.5 ft) above the track.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
T I D A L D A T U M S
Tidal datums at PITTSBURG, NEW YORK SLOUGH, SUISUN BAY based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: April 1979 - August 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9415111 BENICIA, CARQUINEZ STRAIT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.307
MEAN HIGH WATER MHW = 1.153
MEAN SEA LEVEL MSL = 0.678
MEAN TIDE LEVEL MTL = 0.674
MEAN LOW WATER MLW = 0.195
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 4 1937 7.095 5.942
5096 A 1979 1.867 0.714
5096 B 1979 6.632 5.479
5096 D 1979 7.598 6.445
R 10 1930 10.222 9.069
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9415096 PUBLICATION DATE: 04/01/2004
Name: PITTSBURG, NEW YORK SLOUGH, SUISUN BAY
CA
NOAA Chart: 18656 Latitude: 38° 2.2' N ( 38.03670)
USGS Quad: HONKER BAY Longitude: 121° 52.8' W (-121.88000)
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.