U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
To reach the tidal bench marks from San Pablo Avenue in Pinole, proceed NE along
San Pablo Avenue through the town to the first major intersection with a
shopping center on the west side of the intersection, then turn left at the
intersection and follow the road to Hercules, Inc. The bench marks are on the
abandoned Hercules, Inc. property. The tide station was on the NE end of the
Hercules, Inc. abandoned and burned pier.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2 1921
DESIGNATION: TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 8530
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0560
SETTING CLASSIFICATION: Drain tile OPUS PID:
LATITUDE: 38° 1.3' N ( 38.02170) LONGITUDE: 122° 17.4' W (-122.29000)
The primary bench mark is a disk set in the top of a drain tile filled with
cement located near the burned and abandoned pier, 8 m (26 ft) south of fire
alarm box #117, 2 m (6 ft) west of the first iron fire hydrant on the solid
ground at the intersection of two roads SE of the pier, and 0.15 m (0.5 ft)
above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4 1921
DESIGNATION: TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 8531
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0558
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 1.2' N ( 38.02000) LONGITUDE: 122° 17.3' W (-122.28800)
The bench mark is a disk set in the top of the concrete foundation at the NW
corner of the abandoned power plant, the only large brick building north of the
Southern Pacific railroad tracks, 0.76 m (2.5 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5 1936
DESIGNATION: TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 8532
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0557
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 38° 1.1' N ( 38.01830) LONGITUDE: 122° 17.4' W (-122.29000)
The bench mark is a disk set in the top of the east corner of the concrete base
for double semaphore #234-235 on the SE side of the Southern Pacific railroad
tracks, and 0.3 km (0.2 mi) SW of the Hercules railroad station, 5.67 m (18.6
ft) east of the east rail of the main track, and 0.15 m (0.5 ft) above the level
of the tracks.
BENCH MARK STAMPING: 5074 F 1976
DESIGNATION: 941 5074 F
MONUMENTATION: Tidal Station disk VM#: 8533
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 1.4' N ( 38.02330) LONGITUDE: 122° 17.5' W (-122.29200)
The bench mark is a disk located near the Southern Pacific railroad tracks, 20 m
(67 ft) WSW of brick building #8102, 19 m (62 ft) WNW of the westernmost of four
rails, and 7.47 m (24.5 ft) SSW of three culverts at the outer fence of
Hercules, Inc., property. The bench mark is set 0.12 m (0.4 ft) above grade,
crimped to the top of a copper-clad steel rod driven 6.7 m (22 ft), and encased
in a PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5074 G 1976
DESIGNATION: 940 5074 G
MONUMENTATION: Tidal Station disk VM#: 8534
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 38° 1.4' N ( 38.02330) LONGITUDE: 122° 17.5' W (-122.29200)
The bench mark is a disk located 122 m (400 ft) north of the centerline of the
intersection of Railroad and Santa Fee Streets, 48 m (157 ft) SSW of the SW
corner of Hercules, Inc. building #9, 45 m (149 ft) NNE of Southern Pacific
railroad switch #2823, 13 m (42 ft) ESE of the easternmost rail, and 2 m (5 ft)
WSW of building #10. The bench mark is set 0.15 m (0.5 ft) above grade, crimped
to the top of a copper-clad steel rod driven 11.3 m (37 ft), and encased in a
PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
T I D A L D A T U M S
Tidal datums at HERCULES WHARF based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: October 1986 - January 1987
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9414290 SAN FRANCISCO, SAN FRANCISCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.854
MEAN HIGH WATER MHW = 1.673
MEAN TIDE LEVEL MTL = 0.984
MEAN SEA LEVEL MSL = 0.981
MEAN LOW WATER MLW = 0.295
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2 1921 3.196 1.523
4 1921 4.294 2.621
5 1936 3.538 1.865
5074 F 1976 5.079 3.406
5074 G 1976 2.789 1.116
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9415074 PUBLICATION DATE: 05/01/2003
Name: HERCULES WHARF
CA
NOAA Chart: 18654 Latitude: 38° 1.4' N ( 38.02330)
USGS Quad: MARE ISLAND Longitude: 122° 17.5' W (-122.29200)
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.