U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 05/07/1992
Station ID: 9414883 SUPERCEDED DATE: 04/21/2003
Name: STOCKTON, SAN JOAQUIN RIVER
CALIFORNIA
NOAA Chart: 18661 Latitude: 37° 57.4' N
USGS Quad: STOCKTON WEST Longitude: 121° 17.5' W
To reach the tidal bench marks from the downtown Stockton Exit on Interstate
Highway 5, proceed east on West Lafayette Avenue, make a left turn on South El
Dorado Street and continue north for seven blocks, make a left turn on Park
Street and shortly thereafter turn left on North Center Street. The bench marks
are at the Stockton Civic Center, City Hall, police building, post office, and
railroad depot. The tide gage and staff were in Lake McLeod turning basin
directly across from City Hall.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BM 1 1932
MONUMENTATION: Survey Disk VM#: 8484
AGENCY: PID#: HS0393
SETTING CLASSIFICATION: Concrete Steps
The primary bench mark is set in the south end of the lowest step at the north
entrance to City Hall, 54.4 feet (16.6 m) west of the NE corner of the building,
42.5 feet (13.0 m) south of the south curb of East Fremont Street, 0.3 foot (0.1
m) west of a balustrade post, and 0.2 foot (0.1 m) above the sidewalk.
BENCH MARK STAMPING: BM 2 1932
MONUMENTATION: Survey Disk VM#: 8485
AGENCY: PID#: HS0396
SETTING CLASSIFICATION: Concrete Step
The bench mark is set in the south end of the lowest step at the east entrance
to Police and Fire Alarm Control Station on West Fremont Street between North
Commerce and North Center Streets, 52.5 feet (16.0 m) SE of the SE curb of West
Fremont Street, 5.5 feet (1.7 m) SE of an iron handrail, and 0.7 foot (0.2 m)
above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 05/07/1992
Station ID: 9414883 SUPERCEDED DATE: 04/21/2003
Name: STOCKTON, SAN JOAQUIN RIVER
CALIFORNIA
NOAA Chart: 18661 Latitude: 37° 57.4' N
USGS Quad: STOCKTON WEST Longitude: 121° 17.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 3 1932
MONUMENTATION: Survey Disk VM#: 8486
AGENCY: PID#: HS0395
SETTING CLASSIFICATION: Concrete Step
The bench mark is set in the south end of the top step at the east entrance to
Stockton Memorial Civic Center, 120 feet (37 m) NW of the intersection of West
Fremont and North Center Streets, and about 1 foot (0.3 m) above the sidewalk.
BENCH MARK STAMPING: 5 1936
MONUMENTATION: Survey Disk VM#: 8487
AGENCY: PID#: HS0391
SETTING CLASSIFICATION: Granite Slab
The bench mark is set in the NW corner of a granite landing which forms an
entrance porch for the south door of the post office building, about 120 feet
(37 m) NW of the NW corner of East Lindsay and North San Joaquin Streets, 4.8
feet (1.5 m) west of the west end of a door, and about 4 feet (1 m) above the
sidewalk.
BENCH MARK STAMPING: D 9 RESET 1936
MONUMENTATION: Survey Disk VM#: 8488
AGENCY: PID#: HS0088
SETTING CLASSIFICATION: Retaining Wall
The bench mark is set in the top of the north end of a concrete retaining wall
at the top of a concrete stairway to the basement under the baggage room at the
Southern Pacific Railroad passenger depot, 90 feet (27 m) south of the south
curb of East Miner Avenue, 34 feet (10 m) west of the west rail of the west
track, 20.5 feet (6.2 m) south of the NE corner of the depot, and 0.2 foot (0.1
m) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 05/07/1992
Station ID: 9414883 SUPERCEDED DATE: 04/21/2003
Name: STOCKTON, SAN JOAQUIN RIVER
CALIFORNIA
NOAA Chart: 18661 Latitude: 37° 57.4' N
USGS Quad: STOCKTON WEST Longitude: 121° 17.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4883 F 1978
MONUMENTATION: Survey Disk VM#: 8489
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is in the east end of a 10 foot (3 m) wide planter at the south
edge of Civic Center Parking Lot #2, 132 feet (40 m) SSW of the SW corner of
Police and Fire Alarm Control Station on West Fremont Street, 23 feet (7 m) SW
of the top of the steps leading down to Lake McCloud Turning Basin, 18.5 feet
(5.6 m) east of the projected centerline of North Commerce Street, 5.7 feet (1.7
m) west of an aluminum lamp post, and 5.2 feet (1.6 m) NW of a railing at the SE
edge of the planter. The bench mark is 0.9 foot (0.3 m) below ground level,
crimped to a stainless steel rod driven 29 feet (9 m) to refusal, and encased in
a 4-inch PVC pipe.
BENCH MARK STAMPING: 4883 G 1978
MONUMENTATION: Survey Disk VM#: 8490
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is in a 22.5 x 19 foot (6.9 x 6 m) planter at the NW corner of
Civic Center Parking Lot #2, 272 feet (83 m) NW of Bench Mark 4883 F 1978 across
the parking lot, about 170 feet (52 m) west of the centerline of North Commerce
Street, 12 feet (4 m) SE of a telephone pole, 12 feet (4 m) south of the south
curb of West Fremont Street, and 8.5 feet (2.6 m) east of the NW corner of 420
North Madison Street. The bench mark is 1 foot (0.3 m) below ground level,
crimped to a stainless steel rod driven 21 feet (6 m) to refusal, and encased in
a 4-inch PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 05/07/1992
Station ID: 9414883 SUPERCEDED DATE: 04/21/2003
Name: STOCKTON, SAN JOAQUIN RIVER
CALIFORNIA
NOAA Chart: 18661 Latitude: 37° 57.4' N
USGS Quad: STOCKTON WEST Longitude: 121° 17.5' W
T I D A L D A T U M S
Tidal datums at STOCKTON, SAN JOAQUIN RIVER based on:
LENGTH OF SERIES: 4 YEARS
TIME PERIOD: 1978-1981
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9415144 PORT CHICAGO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/18/1980) = 6.80
MEAN HIGHER HIGH WATER MHHW = 3.97
MEAN HIGH WATER MHW = 3.52
MEAN TIDE LEVEL MTL = 2.01
MEAN LOW WATER MLW = 0.50
MEAN LOWER LOW WATER MLLW = 0.00
* North American Vertical Datum NAVD88 = -1.82
LOWEST OBSERVED WATER LEVEL (04/28/1981) = -0.88
* NGVD reference based on elevations published in Quad 371211, 1992, and NOS
leveling of 1982.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
BM 1 1932 12.11 8.59
BM 2 1932 12.65 9.13
BM 3 1932 12.68 9.16
5 1936 15.09 11.57
D 9 RESET 1936 18.44 14.92
4883 F 1978 10.29 6.77
4883 G 1978 9.80 6.28
Foot Notes:
There has been significant subsidence in this area.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 05/07/1992
Station ID: 9414883 SUPERCEDED DATE: 04/21/2003
Name: STOCKTON, SAN JOAQUIN RIVER
CALIFORNIA
NOAA Chart: 18661 Latitude: 37° 57.4' N
USGS Quad: STOCKTON WEST Longitude: 121° 17.5' 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.