U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
To reach the tidal bench marks from Concord, CA, go north on Interstate 680 to
the Marina Vista Drive exit (# 56, last exit before toll bridge over Sacramento
River). Turn left (west) on Marina Vista Drive and proceed 1.3 km (0.8 mi) to
Amorco road on the right. This is a private road and not well marked. Cross
the railroad tracks and under the railroad overpass to continue right on Amorco
Road, proceed 1.3 km (0.8 mi) to a parking lot and guard station. Continue out
the wharf to the Operators office where you must sign in. Proceed on foot to
the far west end of the wharf and the tide station is on the NW corner.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5102 D 2013
DESIGNATION: 941 5102 D
MONUMENTATION: Metal Rod VM#: 20716
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBCZ49
LATITUDE: 38° 2.0' N ( 38.03256) LONGITUDE: 122° 7.2' W (-122.11947)
The primary bench mark is a metal rod located at the SW corner of the pier
parking lot, south of the guard station, 7.31 m (24.0 ft) south of south edge of
concrete walkway, 1.87 m (6.1 ft) west of back of west curb around the parking
lot, and 1.35 m (4.4 ft) NNE of SE fence corner. The datum point is set 9.0 cm
(3.5 in) below ground, being the top of a stainless steel rod driven 409 m (16
ft) to refusal and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5102 A 2013
DESIGNATION: 941 5102 A
ALIAS: Met SRM
MONUMENTATION: Tidal Station disk VM#: 20717
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Large concrete pier OPUS PID:
LATITUDE: 38° 2.1' N ( 38.03469) LONGITUDE: 122° 7.5' W (-122.12514)
The bench mark is a disk set flush in the concrete pier deck located at west end
of Amorco pier, SE of the tide station, 7.56 m (24.8 ft) west of the east edge
of concrete, 2.59 m (8.5 ft) east of the meteorological sensor mast, and 2.41 m
(7.9 ft) south of the side looking current meter I-beam.
BENCH MARK STAMPING: 5102 B 2013
DESIGNATION: 941 5102 B
MONUMENTATION: Tidal Station disk VM#: 20718
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Large concrete pier OPUS PID:
LATITUDE: 38° 2.1' N ( 38.03461) LONGITUDE: 122° 7.5' W (-122.12428)
The bench mark is a disk set flush in the SE corner of a concrete mooring hook
pier located to the west of Amorco pier, 1.56 m (5.1 ft) east of a navigation
light pole, 0.5 m (1.6 ft) west of east side of the pier, and 0.46 m (1.5 ft)
north of south side of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5102 C 2013
DESIGNATION: 941 5102 C
MONUMENTATION: Tidal Station disk VM#: 20719
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete bollard foundation OPUS PID:
LATITUDE: 38° 2.0' N ( 38.03314) LONGITUDE: 122° 7.2' W (-122.11978)
The bench mark is a disk set flush in a concrete foundation for a guard pole
located at the outside of the curve where Amorco Road meets the pier, 8.96 m
(29.4 ft) NE of the SE corner of the smokers shack, 7.98 m (26.2 ft) east of the
east end of the pier, and 4.2 m (13.8 ft) west of north end of a jersey barrier.
BENCH MARK STAMPING: 5102 E 2013
DESIGNATION: 941 5102 E
MONUMENTATION: Metal Rod VM#: 20720
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 38° 1.9' N ( 38.03208) LONGITUDE: 122° 7.2' W (-122.11961)
The bench mark is located on east side of the Amorco access road, 22.7 m (74.5
ft) SSE of a surveillance camera pole, 2.82 m (9.3 ft) east of east edge of
road, and 1.4 m (4.6 ft) west of a cyclone fence. The datum point is a set 9.0
cm (3.5 in) below ground, being the top of a stainless steel rod driven 5.9 m
(19.5 ft) to refusal and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5102 F 2013
DESIGNATION: 941 5102 F
MONUMENTATION: Metal Rod VM#: 20721
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 38° 1.9' N ( 38.03142) LONGITUDE: 122° 7.2' W (-122.11969)
The bench mark is located on the east side of the Amorco access road, 23.01 m
(75.5 ft) NE of a red riser with valves, 11.86 m (38.9 ft) SE of a large yellow
painted valve in a pipeline, 2.97 m (9.7 ft) east of west edge of road, and 1.16
m (3.8 ft) west of a cyclone fence. The datum point is set 9.0 cm (3.5 in) below
ground, being the top of a stainless steel rod driven 5.5 m (18 ft) to refusal
and encased in a 5-inch NOS logo cap.
BENCH MARK STAMPING: 5102 G 2013
DESIGNATION: 941 5102 G
MONUMENTATION: Metal Rod VM#: 20722
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBGQ56
LATITUDE: 38° 1.8' N ( 38.03067) LONGITUDE: 122° 20.2' W (-122.33653)
The bench mark is located on the east side of the Amorco access road, 27.77 m
(91.1 ft) north of the north edge of a gate in a cyclone fence, 13.0 m (42.7 ft)
east of a petroleum pipeline warning sign, 2.39 m (7.8 ft) east of edge of road,
and 1.04 m (3.4 ft) west of a cyclone fence. The datum point is below the
ground, being the top of a stainless steel rod driven 5.6 m (18.5 ft) to refusal
and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
T I D A L D A T U M S
Tidal datums at MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT based on:
LENGTH OF SERIES: 5 YEARS
TIME PERIOD: 03/2014-02/2015, 11/2015-10/2019
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 (01/12/2017) = 2.339
MEAN HIGHER HIGH WATER MHHW = 1.634
MEAN HIGH WATER MHW = 1.476
MEAN TIDE LEVEL MTL = 0.872
MEAN SEA LEVEL MSL = 0.871
MEAN LOW WATER MLW = 0.267
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.175
LOWEST OBSERVED WATER LEVEL (12/05/2017) = -0.313
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5102 D 2013 9.310 7.834
5102 A 2013 4.915 3.439
5102 B 2013 4.389 2.913
5102 C 2013 4.413 2.937
5102 E 2013 7.239 5.763
5102 F 2013 6.400 4.924
5102 G 2013 6.139 4.663
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9415102 PUBLICATION DATE: 10/14/2020
Name: MARTINEZ-AMORCO PIER, CARQUINEZ STRAIT
CA
NOAA Chart: 18657 Latitude: 38° 2.1' N ( 38.03464)
USGS Quad: BENICIA Longitude: 122° 7.5' W (-122.12519)
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.