U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W To reach the tidal bench marks from U.S. Highway 101 exit at Seaport Boulevard to Port of Redwood City, go 1.6 km (1 mi) NE of the freeway on the Seaport Boulevard to the entrance gate to Wharf No 5 near the SW end of the port. The bench marks are in the general vicinity along the coast. The tide gage is located on the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: TIDAL BM 13 1974 DESIGNATION: 941 4523 TIDAL 13 MONUMENTATION: Tidal Station disk VM#: 8320 AGENCY: National Ocean Survey (NOS) PID#: HT2319 SETTING CLASSIFICATION: Curb The primary bench mark is a disk set flush in top of the south curb of the central one of three concrete ramps leading to Wharf 5, 28.83 m ( 94.6 ft) ESE of the shoreward face of the Wharf, 22.46 m (73.7 ft) SW of the SW corner of the metal office/restroom building (shoreward of north end of Wharf 5) and 0.2 m (0.7 ft) above the pavement. BENCH MARK STAMPING: 4508 A 1997 DESIGNATION: 941 4508 A MONUMENTATION: Tidal Station disk VM#: 13852 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Unspecified deep rod The bench mark is a disk located west of post office at south of bend in Kerkner Road, 8 m (26 ft) east of centerline of north/south running segment of Herkner Road, 5.30 m (17.4 ft) SW of center of railroad tracks, 4.91 m (16.1 ft) NE of a fence with witness sign attached. The bench mark is set 0.20 m (0.7 ft) below ground level, crimped to a rod driven 15.5 m (51 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4508 B 1997 DESIGNATION: 941 4508 B MONUMENTATION: Tidal Station disk VM#: 13853 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Unspecified deep rod The bench mark is a disk located at the SW corner of the intersection of the Seaport Boulevard and Herkner Road, south of the post office, 20.70 m (67.9 ft) west of center of Seaport Boulevard, 5.70 m (18.7 ft) west of center of railroad tracks, 2 m (7 ft) east of a fence with witness sign attached. The bench mark is set 0.10 m (0.3 ft) below ground level, and crimped to a rod driven 18.3 m (60 ft) to refusal. BENCH MARK STAMPING: BM 4508 C 1997 DESIGNATION: 941 4508 C MONUMENTATION: Tidal Station disk VM#: 13854 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete pad The bench mark is a disk set in the SE corner of a 1.35 m x 1.35 m (4.4 ft x 4.4 ft) concrete block supporting a bollard located between wharfs 4 and 5 at the Port of Redwood City, 15.20 m (49.9 ft) west of junction of two railroad tracks, 10.12 m (33.2 ft) east of the concrete breakwater, 5.48 m (18.0 ft) north of a yellow fire plug with four yellow guard posts, and 0.50 m (1.6 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4508 D 1997 DESIGNATION: 941 4508 D MONUMENTATION: Tidal Station disk VM#: 13855 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Street The bench mark is a disk set in the south side of the median strip in the middle of Herkner Road at the entrance to the port of Redwood City, 18.30 m ( 60.0 ft) south of the SE corner of the Port of Redwood City office building, 15.15 m (49.7 ft) west of the east end of the concrete median strip, 2.17 m (7.1 ft) east of the SE corner of the guard shack, and 0.90 m (2.9 ft) south of a flag pole. BENCH MARK STAMPING: WHARF 4 1985 DESIGNATION: 941 4523 WHARF 4 MONUMENTATION: Bench Mark disk VM#: 13856 AGENCY: US Geological Survey (USGS) PID: SETTING CLASSIFICATION: Sea wall The bench mark is a disk set into the seaward bullrail on north end of catwalk leading to southern dolphin on wharf 4, 5.80 m (19.0 ft) south of high voltage box "E2", 2.20 m (7.2 ft) south of the 2nd southernmost bollard, 1.70 m (5.6 ft) from western wharf face, and 0.30 m (1.0 ft) above wharf deck.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4508 T 1998 DESIGNATION: 941 4508 T MONUMENTATION: Tidal Station disk VM#: 14824 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Curb The bench mark is a disk set in the south curb of the northern most ramp leading to Wharf 5 at the Port of Redwood City, 14.60 m (47.9 ft) west of a light pole leading to the pier, 10.0 m (32.8 ft) NW of SE end of curb, and 4.6 m (15.1 ft) south of center of ramp. BENCH MARK STAMPING: 4508 U 1998 DESIGNATION: 941 4508 U MONUMENTATION: Tidal Station disk VM#: 14825 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Sea wall The bench mark is a disk set in a sea wall near a boat ramp at the Port of Redwood City between Wharfs 4 and 5, 15.24 m (50.0 ft) west of center of road leading to the Wharf 4, 5.50 m (18.0 ft) east of center of boat ramp, and 4.90 m (16.1 ft) south of the north end of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W T I D A L D A T U M S Tidal datums at REDWOOD CITY, WHARF 5, S. F. BAY based on: LENGTH OF SERIES: 6 Years TIME PERIOD: November 1997 - October 2002 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9414750 ALAMEDA, SAN FRANCISCO BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (12/03/1983) = 3.310 MEAN HIGHER HIGH WATER (MHHW) = 2.506 MEAN HIGH WATER (MHW) = 2.313 MEAN SEA LEVEL (MSL) = 1.345 MEAN TIDE LEVEL (MTL) = 1.339 MEAN LOW WATER (MLW) = 0.365 MEAN LOWER LOW WATER (MLLW) = 0.000 LOWEST OBSERVED WATER LEVEL (12/24/1999) = -0.785 National Geodetic Vertical Datum (NGVD 29) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW TIDAL BM 13 1974 3.960 1.647 4508 A 1997 2.810 0.497 4508 B 1997 2.071 -0.242 BM 4508 C 1997 3.901 1.588 4508 D 1997 2.362 0.049 WHARF 4 1985 4.639 2.326 4508 T 1998 4.127 1.814 4508 U 1998 3.560 1.247
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9414523 PUBLICATION DATE: 04/21/2003 Name: REDWOOD CITY, WHARF 5, S. F. BAY CALIFORNIA NOAA Chart: 18651 Latitude: 37° 30.4' N USGS Quad: Redwood Point Longitude: 122° 12.6' W 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 (NAVD 88). NGVD 29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD 29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD 88 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. NAVD 88 replaces NGVD 29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD 88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD 88 elevations. The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD 88 elevations listed for each bench mark in the NGS database.