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National Ocean Service
Datums Page Page 1 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
To reach the tidal bench marks from the 29th Avenue exit on State Highway 17 in
Alameda, proceed North 29th Avenue (becomes Park Street) to the drawbridge over
the channel. The bench marks are along Park Street on the Oakland and Alameda
side. The tide gage and staff were on the SW end of the wooden and steel fender
on the Alameda side of the Park Street bridge.
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 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PARK CLEM 1947
DESIGNATION: PARK CLEM
MONUMENTATION: Traverse Station disk VM#: 7560
AGENCY: US Geological Survey (USGS) IDB PID#: HT2543
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 46.2' N ( 37.77000) LONGITUDE: 122° 14.3' W (-122.23800)
The bench mark is a disk set in top of a concrete monument 0.15 m (0.5 ft)
square at top, 0.15 m x 0.25 m (0.5 ft x 0.8 ft) at the bottom, and 0.76 m (2.5
ft) long, accessible through a small manhole cover with a City of Oakland lid
inscribed with CITY MONUMENT in the sidewalk at Alameda, 2.74 m (9.0 ft) south
of the south curb of Clement Avenue, 1.52 m (5.0 ft) west of the west curb of
Park Street, and 0.24 m (0.8 ft) below the surface of the sidewalk.
BENCH MARK STAMPING: 42 A 1941 HARBOR LINE
DESIGNATION: 42 A
MONUMENTATION: Survey disk VM#: 7557
AGENCY: US Army Corps of Engineers (USE) IDB PID#: HT0025
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 37° 46.3' N ( 37.77170) LONGITUDE: 122° 14.2' W (-122.23700)
The bench mark is a disk set in top of the SE sidewalk of the Park Street bridge
over the channel (Alameda side), in the top of the SW end of the concrete base
of the NW guardrail, about 91 m (300 ft) NE of the intersection of Park and
Blanding Avenues, 6.19 m (20.3 ft) NE of the south corner of the drawspan, and
1.04 m (3.4 ft) NE of the SE steel guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 43 A 1941 HARBOR LINE
DESIGNATION: 43 A
MONUMENTATION: Survey disk VM#: 7558
AGENCY: US Army Corps of Engineers (USE) IDB PID#: HT0024
SETTING CLASSIFICATION: Sidewalk OPUS PID#: HT0024
LATITUDE: 37° 46.3' N ( 37.77170) LONGITUDE: 122° 14.1' W (-122.23500)
The bench mark is a disk set in top of the NE sidewalk of the Park Street bridge
over the channel, about 46 m (150 ft) SW of the Y-junction of 29th and 23rd
Avenues in Oakland, 2.87 m (9.4 ft) east of the east corner of the drawspan, and
1.04 m (3.4 ft) NW of the SE steel guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PARK CLARA 1947
DESIGNATION: PARK CLARA
MONUMENTATION: Traverse Station disk VM#: 7559
AGENCY: US Geological Survey (USGS) IDB PID#: HT0031
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 45.9' N ( 37.76500) LONGITUDE: 122° 14.5' W (-122.24200)
The bench mark is a disk set in top of a concrete monument at the NW corner of
the intersection of Santa Clara Avenue and Park Street in Alameda, 1.77 m (5.8
ft) north of the prolongation of the north curb of the avenue, 1.16 m (3.8 ft)
west of the prolongation of the west curb of the street, 0.24 m (0.8 ft) below
the surface of the sidewalk, and encased in an 8-inch iron pipe with a cast
iron cover flush with the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PARK PAC 1947
DESIGNATION: PARK PAC
MONUMENTATION: Traverse Station disk VM#: 7561
AGENCY: US Geological Survey (USGS) IDB PID#: HT2538
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 46.0' N ( 37.76670) LONGITUDE: 122° 14.4' W (-122.24000)
The bench mark is a disk set in top of a concrete monument 0.15 m (0.5 ft)
square at top, 0.15 m x 0.25 m (0.5 ft x 0.8 ft) at the bottom, and 0.76 m (2.5
ft) long, accessible through a small manhole cover with a City of Oakland lid
inscribed with CITY MONUMENT in the sidewalk in Alameda, 2.74 m (9 ft) west of
the west curb of Park Street, 1.2 m (4 ft) north of the north curb of Pacific
Avenue, and 0.25 m (0.8 ft) below the surface of the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: T 470 1951
DESIGNATION: T 470
MONUMENTATION: Bench Mark disk VM#: 7562
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT0027
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 46.2' N ( 37.77000) LONGITUDE: 122° 14.2' W (-122.23700)
The primary bench mark is a disk set in top of the SW end of the concrete base
of the NW guardrail, at the SE end (Alameda side) of the Park Street bridge over
the channel, at the intersection of Park Street and Blanding Avenue, 7.13 m
(23.4 ft) NW of the centerline of Park Street, and 0.3 m (1 ft) above the
street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CLARA WAL
DESIGNATION: CLARA WAL 1947
MONUMENTATION: Bench Mark disk VM#: 20932
AGENCY: US Army Corps of Engineers IDB PID#:
SETTING CLASSIFICATION: Disk in Concrete OPUS PID:
LATITUDE: 37° 46.0' N ( 37.76731) LONGITUDE: 122° 14.8' W (-122.24611)
The benchmark is a disk set in top of a concrete post accessible through a small
manhole covered with a City of Oakland iron lid near the intersection of Santa
Clara Avenue and Walnut Street in Alameda, 10 m (33 ft) to the NE corner of the
intersection, 2.13 m (7 ft) north of the north curb of Santa Clara Avenue and
0.91 m (3 ft) east of the east curb of Walnut Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
T I D A L D A T U M S
Tidal datums at OAKLAND/ALAMEDA PARK ST. BRIDGE based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: December 2010 - February 2011
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9414750 ALAMEDA, SAN FRANCISCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.985
MEAN HIGH WATER MHW = 1.796
MEAN TIDE LEVEL MTL = 1.068
MEAN SEA LEVEL MSL = 1.029
MEAN LOW WATER MLW = 0.340
North American Vertical Datum NAVD88 = 0.045
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PARK CLEM 1947 4.386 2.590
42 A 1941 HARBOR LINE 6.819 5.023
43 A 1941 HARBOR LINE 6.497 4.701
PARK CLARA 1947 9.452 7.656
PARK PAC 1947 7.683 5.887
T 470 1951 4.014 2.218
CLARA WAL 8.563 6.767
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 9414746 PUBLICATION DATE: 05/07/2014
Name: OAKLAND/ALAMEDA PARK ST. BRIDGE
CA
NOAA Chart: 18651 Latitude: 37° 46.3' N ( 37.77170)
USGS Quad: OAKLAND EAST Longitude: 122° 14.1' W (-122.23500)
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.