U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
To reach the tidal bench marks from US Highway 101, exit at Alexander Avenue at
the north end of Golden Gate Bridge, then proceed north 1.6 km (1 mi) to 18
Alexander Avenue, on the north side of street, and park, then proceed down six
flights of steps to the dock. The bench marks are along Alexander Avenue and
2nd, Bridgeway and South Streets. The tide station was located on the southwest
corner of the T-shaped dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4806 C 1977
DESIGNATION: 941 4806 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 8415
AGENCY: National Ocean Survey (NOS) IDB PID#: HT3537
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 37° 50.9' N ( 37.84830) LONGITUDE: 122° 28.7' W (-122.47800)
The primary bench mark is a disk set in rock outcropping, which partially
supports foundation of a house, underneath the shore end of the pier at 18
Alexander Avenue, 16.70 m (54.8 ft) north of a point directly under a tramway,
4.11 m (13.5 ft) NW of the NW piling of apartment number 16B, 1.10 m (3.6 ft)
NNE of the NE corner of the foundation of the apartment building, and 1.3 m (4.3
ft) above level of beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 29 1936
DESIGNATION: 941 4806 TIDAL 29
MONUMENTATION: Tidal Station disk VM#: 8413
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT1073
SETTING CLASSIFICATION: Concrete pylon OPUS PID:
LATITUDE: 37° 51.2' N ( 37.85330) LONGITUDE: 122° 28.7' W (-122.47800)
The bench mark is a disk set vertically in the north face of a concrete pylon at
485 Bridgeway Street located at the NE corner of a concrete retaining wall
surrounding old Hearst Estate, 8 m (27 ft) west of the centerline of the street,
and 0.52 m (1.7 ft) NW of the NE corner of the north one of two large concrete
pylons, and 0.3 m (1 ft) above the street.
BENCH MARK STAMPING: 30 1936
DESIGNATION: 941 4806 TIDAL 30
MONUMENTATION: Tidal Station disk VM#: 8414
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT1074
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 51.4' N ( 37.85670) LONGITUDE: 122° 28.8' W (-122.48000)
The bench mark is a disk set in the concrete base for the NW one of two
ornamental stone elephants located in a public park on the east side of
Bridgeway Street, 8.99 m (29.5 ft) NE of the centerline of Bridgeway Street, and
1 m (3 ft) above the street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4806 D 1977
DESIGNATION: 941 4806 D
MONUMENTATION: Tidal Station disk VM#: 8416
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 37° 50.8' N ( 37.84670) LONGITUDE: 122° 28.6' W (-122.47700)
The bench mark is a disk set in a rock outcropping beneath the most NE building
of the Cote d'Azur Apartments at 100 South Street located between the 4th and
5th pilings from the northeast corner of the building and between the 1st and
2nd row of pilings from the shore. NOTE: Bench mark should be leveled to at low
tide.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4806 COPPER PIN
DESIGNATION: 941 4806 COPPER PIN
ALIAS: COPPER PIN
MONUMENTATION: Not specified (see descriptive text) VM#: 8417
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 37° 50.8' N ( 37.84670) LONGITUDE: 122° 28.6' W (-122.47700)
The bench mark is the head of a copper pin approximately 3 cm (0.1 ft) in
diameter set in a rock outcropping, 30 m (98 ft) south of Sausalito Sewage
Treatment Plant, projecting 3 m (10 m) above beach level, and 0.07 m (0.2 ft)
above the outcropping.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 941 4806 COPPER BOLT
ALIAS: COPPER BOLT
MONUMENTATION: Bolt VM#: 8418
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 37° 50.8' N ( 37.84670) LONGITUDE: 122° 28.6' W (-122.47700)
The bench mark is a copper bolt set in the high point of the outermost of two
rocks just north of Sausalito City limits, the rock is separated from the shore
at all times by a 1.98 m (6.5 ft) wide channel which is 1 m (3 ft) deep at
apparent MLLW, and 75 m (246 ft) SSE of the shore end of the pier at 18
Alexander Avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
T I D A L D A T U M S
Tidal datums at SAUSALITO, SAN FRANCISCO BAY based on:
LENGTH OF SERIES: 2 YEARS
TIME PERIOD: November 1977 - October 1979
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:
HIGHEST OBSERVED WATER LEVEL (01/09/1978) = 2.526
MEAN HIGHER HIGH WATER MHHW = 1.735
MEAN HIGH WATER MHW = 1.552
MEAN TIDE LEVEL MTL = 0.950
MEAN SEA LEVEL MSL = 0.935
MEAN LOW WATER MLW = 0.348
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.052
LOWEST OBSERVED WATER LEVEL (05/05/1977) = -0.827
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4806 C 1977 2.193 0.641
29 1936 3.384 1.832
30 1936 4.832 3.280
4806 D 1977 0.781 -0.771
4806 COPPER PIN 2.128 0.576
941 4806 COPPER BOLT 1.119 -0.433
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9414806 PUBLICATION DATE: 02/05/2004
Name: SAUSALITO, SAN FRANCISCO BAY
CA
NOAA Chart: 18649 Latitude: 37° 50.8' N ( 37.84670)
USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 28.6' W (-122.47700)
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.