U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415064 PUBLICATION DATE: 04/21/2003
Name: ANTIOCH, SAN JOAQUIN RIVER
CA
NOAA Chart: 18656 Latitude: 38° 1.2' N ( 38.02000)
USGS Quad: ANTIOCH Longitude: 121° 48.9' W (-121.81500)
To reach the tidal bench marks, proceed east on Highway 4 to "G" Street exit in
Antioch, then north on "G" Street to 2nd Street, then west two blocks to "I"
Street. The bench marks are along the railroad tracks parallel to the river.
The tide gage and staff were located at the NW corner of the wharf at the
Riverview Lodge and restaurant.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5064 F 1990
DESIGNATION: 941 5064 F
MONUMENTATION: Tidal Station disk VM#: 8526
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 38° 1.2' N ( 38.02000) LONGITUDE: 121° 48.0' W (-121.80000)
The primary bench mark is a disk set flush in a concrete post near the foot of
"F" Street, 8.53 m (28.0 ft) NW of the NW edge of the "Birth place of Antioch"
monument, 8.53 m (28.0 ft) east of a 0.3 m (1 ft) tall sawed off utility pole,
5.49 m (18.0 ft) west of the extended centerline of "F" Street, and 4.57 m (15.0
ft) south of the south railroad track.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415064 PUBLICATION DATE: 04/21/2003
Name: ANTIOCH, SAN JOAQUIN RIVER
CA
NOAA Chart: 18656 Latitude: 38° 1.2' N ( 38.02000)
USGS Quad: ANTIOCH Longitude: 121° 48.9' W (-121.81500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LSS 13 1990
DESIGNATION: LSS 13
MONUMENTATION: Horizontal Station disk VM#: 8525
AGENCY: IDB PID#: JS4726
SETTING CLASSIFICATION: Curb OPUS PID:
LATITUDE: 38° 1.1' N ( 38.01830) LONGITUDE: 121° 48.0' W (-121.80000)
The bench mark is a flat brass disk set flush in top of a concrete curb on the
west side of the entrance road to Riverview Lodge, 7.32 m (24.0 ft) north of the
northern railroad track, 4.88 m (16.0 ft) west of the centerline of "I" Street,
and 0.3 m (1 ft) above the road.
BENCH MARK STAMPING: LS 4802 SJ 345
DESIGNATION: 941 5064 LS 4802 SJ 345
MONUMENTATION: Aluminum marker VM#: 8527
AGENCY: IDB PID#:
SETTING CLASSIFICATION: Concrete wharf deck OPUS PID:
LATITUDE: 38° 1.2' N ( 38.02000) LONGITUDE: 121° 48.0' W (-121.80000)
The bench mark is a flat aluminum mark set flush in the concrete wharf deck at
the Riverview Lodge, 19.51 m (64.0 ft) NE of the center of the double doors on
the north side of the lodge, 9.45 m (31.0 ft) south of the south edge of the
concrete bull rail located on the north side of the wharf, and 1.52 m (5.0 ft)
SW of a 4-inch metal drain.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415064 PUBLICATION DATE: 04/21/2003
Name: ANTIOCH, SAN JOAQUIN RIVER
CA
NOAA Chart: 18656 Latitude: 38° 1.2' N ( 38.02000)
USGS Quad: ANTIOCH Longitude: 121° 48.9' W (-121.81500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5064 G 1996
DESIGNATION: 941 5064 G
MONUMENTATION: Tidal Station disk VM#: 15810
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Electrical service base OPUS PID#: BBCQ21
LATITUDE: 38° 1.2' N ( 38.02000) LONGITUDE: 121° 48.0' W (-121.80000)
The bench mark is a disk set flush on the south end of a concrete electrical
service hatch, 43.59 m (143.0 ft) SE of the corner of the Riverview Lodge, 13.72
m (45.0 ft) north of the northern-most rail of the train tracks, 6.40 m (21.0
ft) west of the entrance to the Antioch Public Fishing Pier, and 2.13 m (7.0 ft)
east of the SE corner of the Riverview Lodge parking lot.
BENCH MARK STAMPING: 5064 H 1996
DESIGNATION: 941 5064 H
MONUMENTATION: Tidal Station disk VM#: 15811
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Storm drain containment bunker OPUS PID:
LATITUDE: 38° 1.2' N ( 38.02000) LONGITUDE: 121° 48.0' W (-121.80000)
The bench mark is a disk set flush in the NW corner of a concrete storm drain
containment bunker, 2.90 m (9.5 ft) south of the southern-most railroad track,
2.44 m (8.0 ft) NW of a 0.61 m (2.0 ft) tall utility pole, 1.52 m (5.0 ft) NE of
the NE end of a concrete retaining wall, and 0.61 m (2.0 ft) above ground level
along the tracks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415064 PUBLICATION DATE: 04/21/2003
Name: ANTIOCH, SAN JOAQUIN RIVER
CA
NOAA Chart: 18656 Latitude: 38° 1.2' N ( 38.02000)
USGS Quad: ANTIOCH Longitude: 121° 48.9' W (-121.81500)
T I D A L D A T U M S
Tidal datums at ANTIOCH, SAN JOAQUIN RIVER based on:
LENGTH OF SERIES: 8 Months
TIME PERIOD: July 1996 - February 1997
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 = 1.181
MEAN HIGH WATER MHW = 1.038
MEAN SEA LEVEL MSL = 0.619
MEAN TIDE LEVEL MTL = 0.608
MEAN LOW WATER MLW = 0.178
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5064 F 1990 2.574 1.536
LSS 13 1990 2.896 1.858
LS 4802 SJ 345 2.750 1.712
5064 G 1996 2.399 1.361
5064 H 1996 3.571 2.533
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415064 PUBLICATION DATE: 04/21/2003
Name: ANTIOCH, SAN JOAQUIN RIVER
CA
NOAA Chart: 18656 Latitude: 38° 1.2' N ( 38.02000)
USGS Quad: ANTIOCH Longitude: 121° 48.9' W (-121.81500)
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.