U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
To reach the tidal bench marks, proceed east on State Route 4 towards Stockton,
stopping just before the bridge over San Joaquin River, then turn left off the
road through a gate into sewage pond yard, then proceed east to the southeast
corner of yard, continue north along the Levee Road on the west bank of the
river to Bascule Railroad bridge. The bench marks are between the railroad
bridge and State Route 4. The tide station was located on the east bridge
fender.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4867 A 1978
DESIGNATION: 941 4867 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10575
AGENCY: National Ocean Survey (NOS) IDB PID#: AE9895
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 37° 56.2' N ( 37.93670) LONGITUDE: 121° 20.1' W (-121.33500)
The primary bench mark is a disk located along gravel road at the east edge of
the Stockton Tertiary Sewage Pond Yard located near the crossing of the Southern
Pacific Company railway tracks over the San Joaquin River, 66.69 m (218.8 ft)
south of the south rail of the railroad tracks, 23.87 m (78.3 ft) south of the
east gatepost of the third gate, 2.74 m (9.0 ft) ENE of centerline of the gravel
road (Levee Road) on west side of San Joaquin River, and 1 m (3 ft) WNW of
witness post. The bench mark is set 43 cm (1.4 ft) above grade, crimped to the
top of a copper-clad rod driven 14.3 m (47 ft) to refusal, and encased in a PVC
pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4867 C 1978
DESIGNATION: 941 4867 C
MONUMENTATION: Tidal Station disk VM#: 8467
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 37° 56.2' N ( 37.93670) LONGITUDE: 121° 20.0' W (-121.33300)
The bench mark is a disk located along the gravel road at the east edge of the
Stockton Sewage Pond Yard, 58 m (190 ft) east of a sheet metal pumphouse, and 4
m (12 ft) north of the centerline of the gravel road on south side of the river.
The bench mark is set 24 cm (0.8 ft) above grade, crimped to the top of a
copper-clad rod driven 14.0 m (46 ft) to refusal, and encased in a PVC pipe with
concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SJ 141 BM 1955 SACTO DIST
DESIGNATION: SJ 141 BM
MONUMENTATION: Survey disk VM#: 8468
AGENCY: US Army Corps of Engineers (USE) IDB PID#: HS0440
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 37° 55.7' N ( 37.92830) LONGITUDE: 121° 19.7' W (-121.32800)
The bench mark is a disk set in the top of the east end of the south concrete
curb of Garwood Bridge, 3.2 km (2 mi) west along State Highway 4 from Southern
Pacific railroad overpass at Stockton, 5 m (15 ft) south of centerline of
highway, 0.61 m (2.0 ft) north of the north face of south concrete guardrail,
and 0.15 m (0.5 ft) above the highway.
BENCH MARK STAMPING: BM NO 2 1934
DESIGNATION: 941 4867 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 10573
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HS0439
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 37° 55.7' N ( 37.92830) LONGITUDE: 121° 19.7' W (-121.32800)
The bench mark is a disk set in the top of the NE corner of the west abutment
located at the Garwood Bridge over San Joaquin River, 5 km (3 mi) west along
State Highway 4 from Southern Pacific Company Railroad overpass at Stockton, 5 m
(17 ft) east of the center of the west levee, 5 m (15 ft) north of the
centerline of highway, and 0.21 m (0.7 ft) north of the north edge of concrete
pillar.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4867 B 1978
DESIGNATION: 941 4867 B
MONUMENTATION: Tidal Station disk VM#: 10576
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 37° 56.2' N ( 37.93670) LONGITUDE: 121° 20.0' W (-121.33300)
The bench mark is a disk located along the gravel road at the east edge of the
Stockton Tertiary Sewage Pond Yard, 132 m (434 ft) SE along levee road from
bench mark 4867 A 1978, 87 m (285 ft) WNW of a sheet metal pumphouse, 2 m (8
ft) north of the centerline of the gravel road (Levee Road) on south bank of
the San Joaquin River, and 1 m (3 ft) west of witness post. The bench mark is
set 0.37 m (1.2 ft) above grade, crimped to the of a copper-clad rod driven 12.8
m (42 ft) to refusal, and encased in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
T I D A L D A T U M S
Tidal datums at BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: December 1978 - November 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9415144 PORT CHICAGO, SUISUN BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.174
MEAN HIGH WATER MHW = 1.043
MEAN SEA LEVEL MSL = 0.598
MEAN TIDE LEVEL MTL = 0.593
MEAN LOW WATER MLW = 0.143
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.646
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4867 A 1978 5.500 4.457
4867 C 1978 5.679 4.636
SJ 141 BM 1955 SACTO DIST 7.399 6.356
BM NO 2 1934 7.256 6.213
4867 B 1978 5.400 4.357
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9414867 PUBLICATION DATE: 03/28/2009
Name: BORDEN HIGHWAY BRIDGE, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 37° 56.2' N ( 37.93670)
USGS Quad: STOCKTON WEST Longitude: 121° 20.0' W (-121.33300)
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.