U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9410738 PUBLICATION DATE: 07/21/2003 Name: KING HARBOR, SANTA MONICA BAY CA NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670) USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800) To reach the tidal bench marks from the Pacific Coast Highway (State Highway 1) and Beryl Drive, proceed west on Beryl Drive for 0.6 km (0.4 mi) to Harbor Drive, then turn left and proceed north on Harbor Drive to King Harbor. The bench marks are on the west and north sides of Basin 2. The tide station was on the SW corner of the Harbormasters pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: TIDAL BM 1 1975 DESIGNATION: 941 0738 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 11740 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800) The primary bench mark is a disk set in the 0.4 m (1.3 ft) diameter concrete foundation of a flagpole, 1 m (3 ft) east of the pier walkway to the harbormaster's office, and 0.24 m (0.8 ft) above grade. BENCH MARK STAMPING: TIDAL BM 2 1975 DESIGNATION: 941 0738 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 11741 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: BBCR83 LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800) The bench mark is a disk set in the west edge of the concrete sidewalk running north-south along the west seawall of the harbor at Basin 2, 18 m (60 ft) NE of the flagpole, and 3 m (10 ft) west of the southernmost gate to the floating slips.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9410738 PUBLICATION DATE: 07/21/2003 Name: KING HARBOR, SANTA MONICA BAY CA NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670) USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL BM 3 1975 DESIGNATION: 941 0738 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 11742 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800) The bench mark is a disk set in the concrete sidewalk at the NW corner of the boat harbor at Basin 2, where the east-west and north-south running sidewalks bordering the harbor seawall intersect. BENCH MARK STAMPING: TIDAL BM 4 1975 DESIGNATION: 941 0738 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 11743 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800) The bench mark is a disk set in the concrete sidewalk running east-west along the north seawall of the harbor, 30 m (100 ft) east of the NW corner, and 0.3 m (1 ft) west of the second gate east of the NW corner.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9410738 PUBLICATION DATE: 07/21/2003 Name: KING HARBOR, SANTA MONICA BAY CA NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670) USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL BM 5 1975 DESIGNATION: 941 0738 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 11744 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 33° 50.8' N ( 33.84670) LONGITUDE: 118° 23.9' W (-118.39800) The bench mark is a disk set in the sidewalk running east-west along the north seawall of the harbor, 122 m (400 ft) east of the NW corner of the harbor, and 0.3 m (1 ft) west of the fourth gate east of the NW corner.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9410738 PUBLICATION DATE: 07/21/2003 Name: KING HARBOR, SANTA MONICA BAY CA NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670) USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800) T I D A L D A T U M S Tidal datums at KING HARBOR, SANTA MONICA BAY based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: October 1975 - October 1975 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: MEAN HIGHER HIGH WATER MHHW = 1.622 MEAN HIGH WATER MHW = 1.397 MEAN TIDE LEVEL MTL = 0.842 MEAN SEA LEVEL MSL = 0.833 MEAN LOW WATER MLW = 0.287 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW TIDAL BM 1 1975 3.422 2.025 TIDAL BM 2 1975 2.646 1.249 TIDAL BM 3 1975 2.701 1.304 TIDAL BM 4 1975 2.679 1.282 TIDAL BM 5 1975 2.681 1.284
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9410738 PUBLICATION DATE: 07/21/2003 Name: KING HARBOR, SANTA MONICA BAY CA NOAA Chart: 18744 Latitude: 33° 50.8' N ( 33.84670) USGS Quad: REDONDO BEACH Longitude: 118° 23.9' W (-118.39800) 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.