U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415052 PUBLICATION DATE: 05/01/2003
Name: GALLINAS, GALLINAS CREEK
CA
NOAA Chart: 18654 Latitude: 38° 0.9' N ( 38.01500)
USGS Quad: NOVATO Longitude: 122° 30.2' W (-122.50300)
To reach the tidal bench marks from Santa Venetia, proceed SE on North San Pedro
Road for 3 km (2 mi) to the entrance road to Bucks Landing on the left. The
bench marks are at the boat ramp and SE along the easternmost gravel road
between North San Pedro Road and Bucks Landing. The tide gauge and staff were
located along side of the floating dock supported by 4 x 6 inch pilings.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5052 B 1979
DESIGNATION: 941 5052 B
MONUMENTATION: Tidal Station disk VM#: 11761
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 38° 0.9' N ( 38.01500) LONGITUDE: 122° 30.2' W (-122.50300)
The primary bench mark is a disk located 82 m (270 ft) SE of the SE corner of
the cafe, 3 m (11 ft) SE of the centerline of the east gravel road to Bucks
Landing and 0.5 m (1.5 ft) NW of a witness post. The bench mark is crimped to a
galvanized steel rod driven 15.8 m (52 ft) to refusal, and encased in a PVC pipe
which extends 0.2 m (0.8 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415052 PUBLICATION DATE: 05/01/2003
Name: GALLINAS, GALLINAS CREEK
CA
NOAA Chart: 18654 Latitude: 38° 0.9' N ( 38.01500)
USGS Quad: NOVATO Longitude: 122° 30.2' W (-122.50300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 552 1956
DESIGNATION: C 552
MONUMENTATION: Bench Mark disk VM#: 11759
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JT0233
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 0.7' N ( 38.01170) LONGITUDE: 122° 30.0' W (-122.50000)
The bench mark is a disk set in the top of the SW corner of the concrete
foundation for the SW steel leg of power transmission line steel tower 5/34, 44
m (145 ft) east of the centerline of North San Pedro Road, 0.4 m (1.2 ft) SW of
the steel leg, and 0.30 m (1 ft) above the ground.
BENCH MARK STAMPING: 5052 A 1979
DESIGNATION: 941 5052 A
MONUMENTATION: Tidal Station disk VM#: 11760
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 38° 0.9' N ( 38.01500) LONGITUDE: 122° 30.2' W (-122.50300)
The bench mark is a disk located at the south end of the boat ramp, 30 m (100
ft) north of the north corner of the cafe, 11 m (36 ft) SW of a gas pump, and
0.8 m (2.5 ft) ENE of a telephone pole. The bench mark is crimped to a
galvanized steel rod driven 4.3 m (14 ft) to refusal, and encased in a PVC pipe
which extends 9 cm (0.3 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415052 PUBLICATION DATE: 05/01/2003
Name: GALLINAS, GALLINAS CREEK
CA
NOAA Chart: 18654 Latitude: 38° 0.9' N ( 38.01500)
USGS Quad: NOVATO Longitude: 122° 30.2' W (-122.50300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5052 C 1979
DESIGNATION: 941 5052 C
MONUMENTATION: Tidal Station disk VM#: 11762
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 38° 0.9' N ( 38.01500) LONGITUDE: 122° 30.2' W (-122.50300)
The bench mark is a disk located 34 m (112 ft) NNW of a telephone pole, 33 m
(107 ft) north of the center of the intersection of North San Pedro Road and the
east gravel road to Bucks landing, 5 m (16 ft) NE of the centerline of the east
gravel road to Bucks Landing, and 1 m (2 ft) north of a witness post. The bench
mark is crimped to a galvanized steel rod driven 7.3 m (24 ft), and encased in a
PVC pipe which extends 0.3 m (1.0 ft) above grade.
BENCH MARK STAMPING: 5052 D 1979
DESIGNATION: 941 5052 D
MONUMENTATION: Tidal Station disk VM#: 11763
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 38° 0.9' N ( 38.01500) LONGITUDE: 122° 30.2' W (-122.50300)
The bench mark is a disk located 81 m (266 ft) ESE of the center of the
intersection of North San Pedro Road and the east gravel road to Bucks Landing,
6 m (21 ft) ENE of the centerline of North San Pedro Road, and 2 m (6 ft) NNW of
a telephone pole. The bench mark is crimped to a galvanized steel rod driven 4.3
m (14 ft), and encased in a PVC pipe which extends 0.2 m (0.6 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415052 PUBLICATION DATE: 05/01/2003
Name: GALLINAS, GALLINAS CREEK
CA
NOAA Chart: 18654 Latitude: 38° 0.9' N ( 38.01500)
USGS Quad: NOVATO Longitude: 122° 30.2' W (-122.50300)
T I D A L D A T U M S
Tidal datums at GALLINAS, GALLINAS CREEK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: August 1979 - 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:
MEAN HIGHER HIGH WATER MHHW = 1.803
MEAN HIGH WATER MHW = 1.619
MEAN TIDE LEVEL MTL = 0.963
MEAN SEA LEVEL MSL = 0.955
MEAN LOW WATER MLW = 0.308
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5052 B 1979 1.768 0.149
C 552 1956 2.285 0.666
5052 A 1979 2.728 1.109
5052 C 1979 2.046 0.427
5052 D 1979 2.574 0.955
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415052 PUBLICATION DATE: 05/01/2003
Name: GALLINAS, GALLINAS CREEK
CA
NOAA Chart: 18654 Latitude: 38° 0.9' N ( 38.01500)
USGS Quad: NOVATO Longitude: 122° 30.2' W (-122.50300)
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.