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.