U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) To reach the tidal bench marks take US Highway 1 to the William Randolph Hearst State Beach Exit, and proceed south (seaward) into the parking area. The bench marks are located in a around the parking area, and extend 0.80 km (0.5 mi) south along Old Highway 1 to a group of 5 warehouses. The tide gage and staff were located on the southwest end of the pier. The former site (1933-34) was located on a pier 365 m (1200 ft) west of the existing pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1933 DESIGNATION: 941 2553 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 8045 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FV1124 SETTING CLASSIFICATION: Step OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.5' W (-121.19200) The primary bench mark is a disk set flush in the fifth step from top of the western stairs on the south side of a Stucco Warehouse with a tiled roof, 56.7 m (186 ft) south of the centerline of Old Highway 1, 18.6 m (61 ft) west of bench mark BM 4 1934, 0.94 m (3.1 ft) south of the SW corner of the easternmost of five warehouses.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1933 DESIGNATION: 941 2553 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 8046 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FV1125 SETTING CLASSIFICATION: Concrete apron OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.6' W (-121.19300) The bench mark is a disk set flush in the south end of concrete apron on the west side of the southernmost corrugated iron warehouse, 57.9 m (190 ft) south of the westerly extended centerline of Old Highway 1, 10.0 m (33.0 ft) south of north corner of warehouse, 5.33 m (17.5 ft) north of SW corner of warehouse, 0.24 m (0.8 ft) west of west edge of corrugated warehouse. BENCH MARK STAMPING: BM 4 1934 DESIGNATION: 941 2553 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 8047 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: FV1123 SETTING CLASSIFICATION: Pavement OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.5' W (-121.19200) The bench mark is a disk set flush in lowest step at SE corner of easternmost of five warehouses, 59.1 m (194 ft) south of centerline of Old Highway 1, 1.0 m (3.3 ft) south of SE corner of warehouse.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2553 A 1977 DESIGNATION: 941 2553 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8048 AGENCY: National Ocean Survey (NOS) IDB PID#: FV1121 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.3' W (-121.18800) The bench mark is a disk located in the William R. Hearst Memorial State Beach Pinic area near the inshore end of the pier, 115.2 m (378 ft) SW of bench mark 2553 B 1977, 17.9 m (59.0 ft) NW of the end of the pier, 16.7 m (55.0 ft) WSW of the westernmost corner of concrete block restroom, set in a grove of large trees, 2.7 m (9.0 ft) NE of a 1.37 m (4.5 ft) diameter eucalyptus tree. The bench mark is set 0.15 m (0.5 ft) below ground level, crimped to the top of a galvanized steel rod driven 2.4 m (8 ft) to refusal and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 2553 B 1977 DESIGNATION: 941 2553 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8049 AGENCY: National Ocean Survey (NOS) IDB PID#: FV1119 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.2' W (-121.18700) The bench mark is a disk located along Old Highway 1, west of the entrance to William R. Hearst Memorial State Beach, 15.8 m (52.0 ft) WNW of centerline of the entrance road to the State Beach, 7.9 m (26.0 ft) SW of the centerline of Old Highway 1, 0.5 m (1.8 ft) NNE of a wire mesh (hurricane) fence. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the top of a galvanized steel rod driven 3.3 m (11 ft) to refusal and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2553 C 1977 DESIGNATION: 941 2553 C TIDAL MONUMENTATION: Tidal Station disk VM#: 8050 AGENCY: National Ocean Survey (NOS) IDB PID#: FV1120 SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 35° 38.7' N ( 35.64500) LONGITUDE: 121° 11.2' W (-121.18700) The bench mark is a disk located along the west side of US Highway 1, at the fence junction with Old Highway 1 from San Simeon, 72.2 m (237 ft) NW of bench mark 2553 B 1977, 17.7 m (58 ft) SSW of the centerline of US Highway 1, 9.7 m (32 ft) NNE of the centerline of Old Highway 1, 0.8 m (2.5 ft) NNE of a wire mesh (hurricane) fence. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the top of a galvanized steel rod driven 1.5 m (5 ft) to refusal and encased in a 4-inch PVC pipe and concrte kickblock. BENCH MARK STAMPING: 19 1917 DESIGNATION: 19 USGS MONUMENTATION: Survey disk VM#: 8051 AGENCY: USGS IDB PID#: FV0986 SETTING CLASSIFICATION: Abutment OPUS PID: LATITUDE: 35° 38.6' N ( 35.64330) LONGITUDE: 121° 11.3' W (-121.18800) The bench mark is a disk set flush in the top of the SE concrete guardrail of the bridge over the Arroyo del Puerto at the east end of the town of the San Simeon, 6.58 m (21.6 ft) NE of the SW end of the wall, 0.18 m (0.6 ft) SE of the NW edge of the wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) T I D A L D A T U M S Tidal datums at SAN SIMEON based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: May 1978 - July 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9412110 PORT SAN LUIS, PACIFIC OCEAN Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.598 MEAN HIGH WATER MHW = 1.381 MEAN TIDE LEVEL MTL = 0.851 MEAN SEA LEVEL MSL = 0.840 MEAN LOW WATER MLW = 0.322 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.068 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1933 6.279 4.898 NO 2 1933 7.581 6.200 BM 4 1934 5.569 4.188 2553 A 1977 9.164 7.783 2553 B 1977 13.916 12.535 2553 C 1977 12.855 11.474 19 1917 6.783 5.402
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9412553 PUBLICATION DATE: 11/13/2003 Name: SAN SIMEON CA NOAA Chart: 18700 Latitude: 35° 38.5' N ( 35.64170) USGS Quad: SAN SIMEON Longitude: 121° 11.3' W (-121.18800) 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.