U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) To reach the tidal bench marks from San Diego Freeway (I-405) in Santa Monica go west on Santa Monica Freeway (I-10) to the Lincoln Boulevard exit. Exit right and proceed NW on Lincoln Boulevard two blocks to Colorado Avenue, turn left on Colorado Avenue and proceed SW until Colorado Avenue dead ends into Santa Monica Municipal Pier. The tidal bench marks are in the vicinity of the Municipal Pier. The tide house is located one deck below the Harbor Master's Office at the seaward end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: TIDAL BM 12 1974 DESIGNATION: 941 0840 TIDAL 12 MONUMENTATION: Tidal Station disk VM#: 929 AGENCY: National Ocean Survey (NOS) IDB PID#: EW6840 SETTING CLASSIFICATION: Concrete curb OPUS PID: LATITUDE: 34° 0.7' N ( 34.01111) LONGITUDE: 118° 29.7' W (-118.49558) The primary bench mark is a disk set flush in the south curb of a westbound access road to U.S. Highway 1, 24.08 m (79.0 ft) NW of the centerline of the Colorado Avenue overpass, 3.96 m (13.0 ft) SW of the centerline of the access road, 0.21 m (0.7 ft) north of the south end of a concrete guard rail, and 0.18 m (0.6 ft) above street level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3 1940 DESIGNATION: 941 0840 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 924 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: EW1586 SETTING CLASSIFICATION: Concrete curb OPUS PID: LATITUDE: 34° 0.6' N ( 34.01022) LONGITUDE: 118° 29.8' W (-118.49642) The bench mark is a disk set in the top of NW curb on the west end of the Colorado Avenue Bridge, SW of Ocean Avenue where the Bridge connects onto Santa Monica Municipal Pier, 193 m (632 ft) SW of the centerline of Ocean Avenue, and 2.90 m (9.5 ft) east of the west end of the bridge. BENCH MARK STAMPING: 5 1941 DESIGNATION: 941 0840 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 928 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: EW1593 SETTING CLASSIFICATION: Concrete wall OPUS PID: LATITUDE: 34° 0.7' N ( 34.01094) LONGITUDE: 118° 29.5' W (-118.49103) The bench mark is a disk set in the center at top of the SW concrete wall around a flower bed on the NW side of the SW entrance to the Santa Monica City Hall, 2.53 m (8.3 ft) NW of the SE end of the wall, 7.01 m (23.0 ft) west of the center of the entrance doorway, and 0.76 m (2.5 ft) higher than the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0840 N 1990 DESIGNATION: 941 0840 N MONUMENTATION: Tidal Station disk VM#: 935 AGENCY: National Ocean Service (NOS) IDB PID#: AH7469 SETTING CLASSIFICATION: Concrete slab OPUS PID#: AH7469 LATITUDE: 34° 0.7' N ( 34.01144) LONGITUDE: 118° 29.7' W (-118.49556) The bench mark is a disk set in the NE corner of a 2 m x 2 m (7 ft x 6 ft) concrete slab that supports a cannon in the park along Ocean Avenue, 61 m (200 ft) NW of the centerline of the Colorado Avenue bridge, 12.80 m (42.0 ft) SE of a drinking fountain, 11.89 m (39.0 ft) NE of a concrete fence that lines the edge of the park, 0.15 m (0.5 ft) NE of the NE edge of the cannon, and 0.61 m (2.0 ft) above ground level. BENCH MARK STAMPING: 0840 P 1994 DESIGNATION: 941 0840 P MONUMENTATION: Tidal Station disk VM#: 6768 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base slab OPUS PID: LATITUDE: 34° 0.8' N ( 34.01389) LONGITUDE: 118° 29.9' W (-118.49828) The bench mark is a disk set flush in the concrete base of a Pacific Utilities Products electrical box located SW of Ocean Boulevard at the base of Santa Monica Boulevard, 17.71 m (58.1 ft) WSW from the traffic signal pole at the intersection, 12.22 m (40.1 ft) SE from the NE corner of Will Roger's monument, and 1.22 m (4.0 ft) north of utility pole with power meter.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0840 Q 1994 DESIGNATION: 941 0840 Q MONUMENTATION: Tidal Station disk VM#: 6769 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base slab OPUS PID: LATITUDE: 34° 0.8' N ( 34.01333) LONGITUDE: 118° 29.9' W (-118.49764) The bench mark is a disk set flush in the eastern corner of the concrete base of canon monument in Palisades Park, located SW of Ocean Boulevard between Santa Monica Boulevard and Broadway, 30.51 m (100.1 ft) south of the southern pillar and visitors information center, 13.62 m (44.7 ft) north of a public viewing telescope, 9.81 m (32.2 ft) south of a lamp post, and 0.21 m (0.7 ft) above ground level. BENCH MARK STAMPING: 0840 R 1994 DESIGNATION: 941 0840 R MONUMENTATION: Tidal Station disk VM#: 6770 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bridge guardrail OPUS PID: LATITUDE: 34° 0.7' N ( 34.01194) LONGITUDE: 118° 29.6' W (-118.49286) The bench mark is a disk set flush in top of a concrete bridge guard rail, in a 0.61 m x 1.40 m (2.0 ft x 4.6 ft) base at the southern end of the bridge crossing over Pacific Coast Highway, located on the western side of Main Street, 9.99 m (32.8 ft) west of centerline of Main Street, 8.50 m (27.9 ft) NNE of yellow fire hydrant, and 1.25 m (4.1 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0840 S 1994 DESIGNATION: 941 0840 S MONUMENTATION: Tidal Station disk VM#: 6777 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base slab OPUS PID: LATITUDE: 34° 0.8' N ( 34.01253) LONGITUDE: 118° 29.8' W (-118.49653) The bench mark is a disk set flush in concrete base of a lightpole near SE corner of intersection of Broadway and Ocean Avenue, 19.60 m (64.3 ft) east of a flagpole, 8.56 m (28.1 ft) south of the lightpole at the base of Broadway, and 0.03 m (0.1 ft) NE of NE side of lightpole base. BENCH MARK STAMPING: 0840 T 1995 DESIGNATION: 941 0840 T MONUMENTATION: Tidal Station disk VM#: 12697 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 34° 0.5' N ( 34.00830) LONGITUDE: 118° 30.0' W (-118.50000) The bench mark is a disk set flush in a concrete base supporting a storm drain lid under the Colorado Avenue bridge leading to Santa Monica Pier, 20.80 m (68.2 ft) SE of a stop sign at the corner of Appian Way and entrance leading to the beach, 10.12 m (33.2 ft) east of yellow fire hydrant at the corner of the entrance to beach parking north of Colorado Avenue and the boardwalk, 1.80 m (5.9 ft) north of an electrical box adjacent to the most southern of pillars supporting bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) T I D A L D A T U M S Tidal datums at SANTA MONICA, PACIFIC OCEAN based on: LENGTH OF SERIES: 18 Years TIME PERIOD: January 1984 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (11/30/1982) = 2.590 MEAN HIGHER HIGH WATER MHHW = 1.653 MEAN HIGH WATER MHW = 1.428 MEAN TIDE LEVEL MTL = 0.855 MEAN SEA LEVEL MSL = 0.849 MEAN LOW WATER MLW = 0.283 North American Vertical Datum NAVD88 = 0.057 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/17/1933) = -0.867 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW TIDAL BM 12 1974 14.315 12.887 3 1940 7.779 6.351 5 1941 20.328 18.900 0840 N 1990 19.093 17.665 0840 P 1994 22.065 20.637 0840 Q 1994 21.344 19.916 0840 R 1994 22.151 20.723 0840 S 1994 20.151 18.723 0840 T 1995 5.973 4.545
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9410840 PUBLICATION DATE: 04/21/2003 Name: SANTA MONICA, PACIFIC OCEAN CA NOAA Chart: 18744 Latitude: 34° 0.5' N ( 34.00830) USGS Quad: BEVERLY HILLS Longitude: 118° 30.0' W (-118.50000) 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.