U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415111 PUBLICATION DATE: 06/09/2003
Name: BENICIA, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330)
USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000)
To reach the tidal bench marks from Interstate 780 in Benicia, take the 5th
Street exit and proceed south for 2 blocks, turn left on M Street, then right on
Grant Street at Port of Benicia. The bench marks are located at Port of Benicia
Wharf and along Bayshore Road. The tide gage and staff were located on the east
side of the Wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9 1948
DESIGNATION: 941 5111 TIDAL 9
MONUMENTATION: Tidal Station disk VM#: 8554
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0141
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.9' W (-122.13200)
The primary bench mark is a disk set at the junction of the seawall and the
wooden handrail which follows the road and railroad tracks to shore, 13 m (42
ft) north of the easternmost of two bollards, 12 m (39 ft) south of the north
end of the seawall, 8.63 m (28.3 ft) SE of a fire hydrant protected by red
pipes, and 0.91 m (3 ft) north of the south end of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415111 PUBLICATION DATE: 06/09/2003
Name: BENICIA, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330)
USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 790 1946
DESIGNATION: 941 5111 D 790
MONUMENTATION: Tidal Station disk VM#: 8553
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0134
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 7.7' W (-122.12800)
The bench mark is a disk set in the top of a concrete base supporting the fourth
steel leg east of the west end of the Southern Pacific Railroad bridge, 23 m (75
ft) east of the centerline of Bayshore Drive, 6 m (20 ft) west of the
shoreline, 0.15 m (0.5 ft) west of the east edge of the concrete base, and 0.46
m (1.5 ft) above the ground.
BENCH MARK STAMPING: 5111 D 1976
DESIGNATION: 941 5111 D
MONUMENTATION: Tidal Station disk VM#: 8556
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000)
The bench mark is a disk located near the NE end of Port of Benicia Wharf at
Gate #23, 54 m (177 ft) south of the centerline of Bayshore Road, 44.90 m (147.3
ft) NW of the corner of Building 54, 4.54 m (14.9 ft) WSW of the center of Gate
#23, 0.70 m (2.3 ft) south of a fire hydrant, and 1 m (2 ft) SW of a witness
post and sign. The bench mark is crimped to the top of a copper-clad steel rod
driven 4.6 m (15 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415111 PUBLICATION DATE: 06/09/2003
Name: BENICIA, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330)
USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5111 E 1976
DESIGNATION: 941 5111 E
MONUMENTATION: Tidal Station disk VM#: 8557
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000)
The bench mark is a disk located on the northern side of Bayshore Road between
Oak Road and the Benicia-Martinez highway bridge, 62 m (202 ft) NW of the
intersection of Bayshore and Oak Roads, 20.57 m (67.5 ft) north of the
northernmost rail of three railroad tracks, 14.51 m (47.6 ft) NW of the
centerline of Bayshore Road, 1.07 m (3.5 ft) from telephone pole KOPPERS FP 70
W6 4-50, and 0.46 m (1.5 ft) SE of a fence surrounding the Toyota storage lot.
The bench mark is set 0.24 m (0.8 ft) above the ground, crimped to the top of a
copper-clad steel rod driven 9.5 m (31 ft) to refusal and encased in a PVC pipe.
BENCH MARK STAMPING: 5111 C 1988
DESIGNATION: 941 5111 C
MONUMENTATION: Tidal Station disk VM#: 8558
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete embankment OPUS PID:
LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000)
The bench mark is a disk set in a drill hole in the top SW corner of a 1.52 m
(5.0 ft) wide concrete embankment near the NE end of the Benicia Industrial
Park, 70 m (230 ft) SW of the pipelines that cross the road, 50 m (164 ft) NNW
from bench mark 5111 D 1976, 2.99 m (9.8 ft) from the northern edge of Bayshore
Drive, and 1.22 m (4.0 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415111 PUBLICATION DATE: 06/09/2003
Name: BENICIA, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330)
USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000)
T I D A L D A T U M S
Tidal datums at BENICIA, CARQUINEZ STRAIT based on:
LENGTH OF SERIES: 5 Years
TIME PERIOD: January 1977 - December 1981
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:
HIGHEST OBSERVED WATER LEVEL (02/21/1980) = 2.239
MEAN HIGHER HIGH WATER MHHW = 1.623
MEAN HIGH WATER MHW = 1.462
MEAN SEA LEVEL MSL = 0.866
MEAN TIDE LEVEL MTL = 0.864
MEAN LOW WATER MLW = 0.265
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.195
LOWEST OBSERVED WATER LEVEL (05/02/1980) = -0.532
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9 1948 4.534 3.072
D 790 1946 3.902 2.440
5111 D 1976 3.068 1.606
5111 E 1976 3.553 2.091
5111 C 1988 4.605 3.143
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415111 PUBLICATION DATE: 06/09/2003
Name: BENICIA, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330)
USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000)
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.