U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415105 PUBLICATION DATE: 09/28/2016
Name: WARDS ISLAND, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 3.0' N ( 38.05003)
USGS Quad: TERMINOUS Longitude: 121° 29.8' W (-121.49686)
To reach the tidal bench marks from Interstate 5, north of Stockton, exit at
Eight Mile Road and proceed west for 13 km (8 mi) until road deadends at the
ferry, then turn left on a levee road and proceed 1.2 km (0.8 mi). The bench
marks are located along the SW end of Empire Tract inside the riprap on the
inside perimeter of the tract. The tide gage and staff were located on the west
end of the Bureau of Reclamation pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: B95580
DESIGNATION: B95580
MONUMENTATION: Survey disk VM#: 22002
AGENCY: National Geodetic Survey (NGS) IDB PID#: DN4097
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 38° 3.0' N ( 38.05028) LONGITUDE: 121° 29.8' W (-121.49667)
The bench mark is located 1200 m (3900 ft) south along the levee road from
Venice Island Ferry, 32 m (105 ft) NW of power pole number 8128, 10.36 m (34 ft)
east of Department of Water Resources Pier, 4 m (13 ft) east of the centerline
of the levee road, and 0.3m (1 ft) south of witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415105 PUBLICATION DATE: 09/28/2016
Name: WARDS ISLAND, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 3.0' N ( 38.05003)
USGS Quad: TERMINOUS Longitude: 121° 29.8' W (-121.49686)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5105 G 1978
DESIGNATION: 941 5105 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 8551
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 2.8' N ( 38.04642) LONGITUDE: 121° 29.9' W (-121.49843)
The bench mark is a disk located 1.63 km (1.02 mi) south along the levee road
from Venice Island Ferry, 12.8m (41.9 ft) East of the centerline of levee road,
3.7m (12 ft) West of telephone pole no. 7840, and 0.9m (3 ft) South of a witness
post, set in concrete inside a pvc pipe and extendeds 0.15m (0.5 ft) above the
ground.
BENCH MARK STAMPING: 5105 H 2014
DESIGNATION: 941 5105 H TIDAL
MONUMENTATION: Survey disk VM#: 22004
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04365) LONGITUDE: 121° 29.8' W (-121.49607)
The bench mark is located 2.09 km south along the levee road from Venice Island
Ferry located inside the Stockton Water Treatment Plant, 12.28 m (40.3 ft) west
of the NE corner of pump house building, 13.35 m (43.8 ft) south of the northern
facility fence line, and 0.43 m (1.4 ft) NE of eastern edge of northern pump
house door. The bench mark is set in concrete 0.12 m (0.4 ft) above building
foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415105 PUBLICATION DATE: 09/28/2016
Name: WARDS ISLAND, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 3.0' N ( 38.05003)
USGS Quad: TERMINOUS Longitude: 121° 29.8' W (-121.49686)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5105 I 2014
DESIGNATION: 941 5105 I TIDAL
MONUMENTATION: Survey disk VM#: 22005
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04393) LONGITUDE: 121° 29.7' W (-121.49577)
The bench mark is located 2.09 km south along the levee road from Venice Island
Ferry located inside the Stockton Water Treatment Plant, 27.19 m (89.2 ft) west
of the eastern facility fence line, 4.82 m (15.8 ft) south of NE corner of pump
house building, and 0.43 m (1.6 ft) NE of northern edge of mechanical room door.
The bench mark is set in concrete 0.4 ft (0.12 m) above building foundation.
BENCH MARK STAMPING: 5105 J 2014
DESIGNATION: 941 5105 J TIDAL
MONUMENTATION: Survey disk VM#: 22006
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04375) LONGITUDE: 121° 29.8' W (-121.49633)
The bench mark is located 2.09 km south along the levee road from Venice Island
Ferry located inside the Stockton Water Treatment Plant, 21.76 m (71.4 ft) west
of the SE corner of the pump house building, 11.55 m (37.9 ft) north of the
seawall, and 0.37 m (1.2 ft) south of western edge of the southern pump house
door. The bench mark is set flush in concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415105 PUBLICATION DATE: 09/28/2016
Name: WARDS ISLAND, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 3.0' N ( 38.05003)
USGS Quad: TERMINOUS Longitude: 121° 29.8' W (-121.49686)
T I D A L D A T U M S
Tidal datums at WARDS ISLAND, SAN JOAQUIN RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: January 2015 - February 2015
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 = 1.029
MEAN HIGH WATER MHW = 0.893
MEAN SEA LEVEL MSL = 0.516
MEAN TIDE LEVEL MTL = 0.513
MEAN LOW WATER MLW = 0.134
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
B95580 1.805 0.912
5105 G 1978 0.718 -0.175
5105 H 2014 3.936 3.043
5105 I 2014 3.954 3.061
5105 J 2014 3.937 3.044
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415105 PUBLICATION DATE: 09/28/2016
Name: WARDS ISLAND, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 3.0' N ( 38.05003)
USGS Quad: TERMINOUS Longitude: 121° 29.8' W (-121.49686)
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.