U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) To reach the tidal bench marks from I-280 and U.S. Highway 101 interchange proceed 2.2 km (1.4 mi) south to Bayshore Blvd., Third Street exit, left onto Third Street, north 2.9 km (1.8 mi) to Evans Street, right turn on Evans Street, 1.1 km (0.7 mi) SE on Evans Street, one block south on Evans Street to Fairfax Street, right on Hunters Point Boulevard, 0.3 km (0.2 mi) after left turn on Innes Avenue and then 0.6 km (0.4 mi) to entrance to guard house with dry dock area at bottom of hill. The tide gage was located 15.24 m (50.0 ft) NW of NW corner of drydock No. 2 and the staff was located on an adjacent pier. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: HUNTERS POINT BM 2 1917 DESIGNATION: TIDAL 2 MONUMENTATION: Bench Mark disk VM#: 8098 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0619 SETTING CLASSIFICATION: Set vertically in west wall OPUS PID: LATITUDE: 37° 43.8' N ( 37.73000) LONGITUDE: 122° 21.5' W (-122.35800) The primary bench mark is a disk set vertically in the west wall at the NW corner of the small brick pump house (Building No. 204) between drydocks No. 2 and 3, 31 m (100 ft) east of center of capstan at SE corner of drydock No. 3, 20 m (64 ft) east of SE corner of south end of caisson of drydock No. 2, and 0.15 m (0.5 ft) above the paved ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HUNTERS POINT BM 3 1917 DESIGNATION: TIDAL 3 MONUMENTATION: Bench Mark disk VM#: 8099 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0618 SETTING CLASSIFICATION: Set vertically on south wall OPUS PID: LATITUDE: 37° 43.8' N ( 37.73000) LONGITUDE: 122° 21.5' W (-122.35800) The bench mark is a disk set vertically in the south wall of brick boiler room C of building No. 205, between drydocks No. 2 and 3, 30 m (100 ft) east of SW corner of boiler room building, 11 m (35 ft) north of north edge of drydock No. 2 and 5 m (15 ft) east of the centerline of the door at center of the boiler room wall. BENCH MARK STAMPING: 4 1941 DESIGNATION: 4 MONUMENTATION: Bench Mark disk VM#: 8100 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0616 SETTING CLASSIFICATION: Concrete platform OPUS PID: LATITUDE: 37° 43.8' N ( 37.73000) LONGITUDE: 122° 21.5' W (-122.35800) The bench mark is a disk set in the top of the SE corner of the concrete loading platform at the NE corner of a large concrete machine shop (Building No. 231), 29 m (96 ft) south of the south side of drydock No. 2, 0.15 m (0.5 ft) north of the north wall of the building, and 1.04 m (3.4 ft) above the pavement.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5 1941 DESIGNATION: 5 MONUMENTATION: Bench Mark disk VM#: 8101 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0615 SETTING CLASSIFICATION: Concrete platform OPUS PID: LATITUDE: 37° 43.8' N ( 37.73000) LONGITUDE: 122° 21.5' W (-122.35800) The bench mark is a disk set in the top of the NW corner of the concrete loading platform at the SW corner of the large concrete machine shop (Building No. 231), 79 m (260 ft) south of drydock No. 2, 0.15 m (0.5 ft) south of the south wall of the building, and 0.9 m (3 ft) above the pavement.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) T I D A L D A T U M S Tidal datums at HUNTERS POINT, S.F. BAY based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: July 1979 - August 1979 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: MEAN HIGHER HIGH WATER MHHW = 2.072 MEAN HIGH WATER MHW = 1.883 MEAN TIDE LEVEL MTL = 1.116 MEAN SEA LEVEL MSL = 1.085 MEAN LOW WATER MLW = 0.348 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW HUNTERS POINT BM 2 1917 3.745 1.862 HUNTERS POINT BM 3 1917 3.824 1.941 4 1941 4.796 2.913 5 1941 4.812 2.929
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9414358 PUBLICATION DATE: 04/30/2012 Name: HUNTERS POINT, S.F. BAY CA NOAA Chart: 18649 Latitude: 37° 43.8' N ( 37.73000) USGS Quad: HUNTERS POINT Longitude: 122° 21.4' W (-122.35700) 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.