U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
To reach the tidal bench marks proceed along State Highway 101 south from Santa
Barbara or north from Ventura, exit at Mussel Shoals and then proceed west
towards the ocean. The bench marks are located on Rincon Island and the
mainland near the causeway. The tide station was located on the north side of
the causeway where it meets the island.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 1 1962
DESIGNATION: 941 1270 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 3113
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EW6485
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 34° 20.8' N ( 34.34670) LONGITUDE: 119° 26.7' W (-119.44500)
The primary bench mark is a disk set in the SE end of the inshore concrete sea
wall flush with the surface of the ground, on the property of Atlantic Richfield
Oil Corporation,15 m (49 ft) SE of the NW corner of the electrical building,
2.74 m (9.0 ft) SW of the SW corner of the railing around the boat ramp, 0.76 m
(2.5 ft) SE of the SE corner of the fire pump building, and 0.18 m ( 0.6 ft) NW
of the SE end of the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL 2 1962
DESIGNATION: 941 1270 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 3114
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EW6484
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 34° 20.9' N ( 34.34830) LONGITUDE: 119° 26.6' W (-119.44300)
The bench mark is a disk set in the NW end of the inshore concrete sea wall on
the property of Atlantic Richfield Oil Corporation, 17.37 m (57.0 ft) NW of the
NW corner of the electrical building, 13.72 m (45.0 ft) SW of the traffic light
on the pier leading from the island, and flush with the surface of the ground.
BENCH MARK STAMPING: GORDA 2 NO 1 CSLC 1959
DESIGNATION: GORDA 2 RM 1
MONUMENTATION: Reference Mark disk VM#: 3115
AGENCY: California Dept. of Transportion (CADT)IDB PID#: EW6481
SETTING CLASSIFICATION: Concrete cylinder OPUS PID:
LATITUDE: 34° 21.3' N ( 34.35500) LONGITUDE: 119° 26.5' W (-119.44200)
The bench mark is a disk set in top of a 1-foot diameter concrete cylinder, 10 m
(33 ft) NW of the centerline of Ocean Avenue, 6.40 m (21.0 ft) SW of the
centerline of Breakers Way, 1.22 m (4.0 ft) NW of powerline pole #2835, and
projects 0.06 m (0.2 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GORDA 2 RM 3 1954
DESIGNATION: GORDA 2 RM 3
MONUMENTATION: Survey disk VM#: 3116
AGENCY: California Dept. of Transportion (CADT)IDB PID#: EW6480
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 21.4' N ( 34.35670) LONGITUDE: 119° 26.5' W (-119.44200)
The bench mark is a disk set in a 0.3 m (1 ft) diameter concrete monument, 30.78
m (101.0 ft) NE of the centerline of Breakers Way, 11.28 m (37.0 ft) west of the
centerline of Ocean Avenue, 3.81 m (12.5 ft) south of the south corner of an
abandoned 5 m x 5 m (16 x 18 ft) concrete slab, and 0.24 m (0.8 ft) west of an
angle iron witness post protruding 0.73 m (2.4 ft) from the ground, and flush
with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GORDA 3 NO 1 1974
DESIGNATION: GORDA 3 RM 1
MONUMENTATION: Reference Mark disk VM#: 3118
AGENCY: California Dept. of Transportion (CADT)IDB PID#: EW6804
SETTING CLASSIFICATION: Concrete foundation pier OPUS PID:
LATITUDE: 34° 21.3' N ( 34.35500) LONGITUDE: 119° 26.5' W (-119.44200)
The bench mark is a disk set in top of a 0.76 m (2.5 ft) high by 1 m (3 ft)
square abandoned concrete foundation pier, 10 m (32 ft) north of the north face
of the most seaward of six abandoned concrete foundation piers, 9.66 m (31.7 ft)
south of the centerline of Breakers Way, and 5.94 m (19.5 ft) SE of the
eastern-most power pole on Breakers Way.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 1048 1960
DESIGNATION: H 1048
MONUMENTATION: Bench Mark disk VM#: 3119
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EW6488
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 34° 21.4' N ( 34.35670) LONGITUDE: 119° 26.4' W (-119.44000)
The bench mark is a disk set in the east concrete abutment of railroad bridge
387.04 located 9.4 km (5.8 mi) SE along the Southern Pacific Railroad from the
station of Carpinteria, 460 m (1500 ft) NE of the inshore end of the causeway
to ARCO's Rincon Island, 80 m (264 ft) east of milepost 387, 1.95 m (6.4 ft)
NNE of the north rail of railroad tracks, 0.55 m (1.8 ft) south of north end of
abutment, and 0.61 m (2.0 ft) below the track level.
BENCH MARK STAMPING: USCE NO 25 1966
DESIGNATION: 25
MONUMENTATION: Survey disk VM#: 3120
AGENCY: US Army Corps of Engineers (USE) IDB PID#: EW6801
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 21.4' N ( 34.35670) LONGITUDE: 119° 26.5' W (-119.44200)
The bench mark is a disk set in the top of a 0.15m (0.5 ft) square concrete post
located 0.5 km (0.3 mi) NNE of the inshore end of the ARCO bridge to Rincon
Island, 11.58 m (38.0 ft) north of the northern edge of Highway 101, 3.05 m
(10.0 ft) south of the southernmost rail of the Southern Pacific Railroad
tracks, 2.74 m (9.0 ft) NNE of a telephone pole, and 0.15 m (0.5 ft) above
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1270 K 1977
DESIGNATION: 941 1270 K TIDAL
MONUMENTATION: Tidal Station disk VM#: 16807
AGENCY: National Ocean Survey (NOS) IDB PID#: EW6807
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 34° 21.3' N ( 34.35500) LONGITUDE: 119° 26.5' W (-119.44200)
The bench mark is a disk set in highest point of bedrock outcropping fronting a
house at 6626 Pacific Coast Highway, 16.82 m (55.2 ft) south of the westerly
concrete foundation of the house, 9.75 m (32.0 ft) east of the west toe of
outcropping, and at apparent high water level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
T I D A L D A T U M S
Tidal datums at RINCON ISLAND, PACIFIC OCEAN based on:
LENGTH OF SERIES: 12 Years
TIME PERIOD: November 1979 - October 1990
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9410660 LOS ANGELES, OUTER HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/27/1983) = 2.380
MEAN HIGHER HIGH WATER MHHW = 1.664
MEAN HIGH WATER MHW = 1.434
MEAN TIDE LEVEL MTL = 0.868
MEAN SEA LEVEL MSL = 0.861
MEAN LOW WATER MLW = 0.301
North American Vertical Datum NAVD88 = 0.030
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/16/1965) = -0.707
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 1 1962 4.755 3.321
TIDAL 2 1962 4.740 3.306
GORDA 2 NO 1 CSLC 1959 5.527 4.093
GORDA 2 RM 3 1954 6.936 5.502
GORDA 3 NO 1 1974 6.751 5.317
H 1048 1960 11.421 9.987
USCE NO 25 1966 11.167 9.733
1270 K 1977 3.154 1.720
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9411270 PUBLICATION DATE: 04/21/2003
Name: RINCON ISLAND, PACIFIC OCEAN
CA
NOAA Chart: 18725 Latitude: 34° 20.9' N ( 34.34830)
USGS Quad: PITAS POINT Longitude: 119° 26.6' W (-119.44300)
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.