U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) To reach the tidal bench marks, proceed west along U.S. Highway 101 in the direction of the Golden Gate Bridge, then NW along Crissey Field Avenue (before the bridge) to the Golden Gate National Park (Presidio). The bench marks are located mostly along the coast in the vicinity. The tide gauge is located on the NE side of the National Parks Service wharf. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 180 1936 DESIGNATION: 941 4290 TIDAL 180 MONUMENTATION: Tidal Station disk VM#: 967 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0702 SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: HT0702 LATITUDE: 37° 48.3' N ( 37.80536) LONGITUDE: 122° 28.0' W (-122.46675) The primary bench mark is a disk set in the top of a 1 m (3 ft) high concrete seawall in Golden Gate National Park at the Gulf of Farallons National Marine Sanctuary headquarters, 15 m (50 ft) east of the NE corner of the Sanctuaries building, 6.10 m (20.0 ft) south of the south side of the garage building, and 1.07 m (3.5 ft) north of an angle in wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM 174 1925 DESIGNATION: 941 4290 TIDAL 174 ALIAS: TIDAL 174 MONUMENTATION: Tidal Station disk VM#: 971 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0697 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 37° 48.5' N ( 37.80836) LONGITUDE: 122° 28.3' W (-122.47131) The bench mark is a disk set in a concrete post flush with the ground inside a circle of bricks in the pavement, 38.10 m (125.0 ft) west of the extended west edge of Engineer's Dock where it crosses Marine Drive, at the center of "Y" between Marine Drive and the road leading SE to Fort Winfield Scott, 12.95 m (42.5 ft) SW of the fire hydrant, and 8.69 m (28.5 ft) south of the south edge of an iron manhole cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM 176 1925 DESIGNATION: 941 4290 TIDAL 176 ALIAS: TIDAL 176 MONUMENTATION: Tidal Station disk VM#: 972 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0705 SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 37° 48.2' N ( 37.80350) LONGITUDE: 122° 28.0' W (-122.46725) The bench mark is a disk set in the west end of the lowest concrete step at the main entrance to the porch of the building at No. 651 Mason Street, 29.87 m (98.0 ft) SE of the intersection of Crissey Field Avenue and Mason Street, 15.24 m (50.0 ft) south of the centerline of Mason Street, and 0.21 m (0.7 ft) above sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 181 1945 DESIGNATION: 941 4290 TIDAL 181 ALIAS: TIDAL 181 MONUMENTATION: Tidal Station disk VM#: 973 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0701 SETTING CLASSIFICATION: Sea wall OPUS PID: LATITUDE: 37° 48.4' N ( 37.80597) LONGITUDE: 122° 28.1' W (-122.46750) The bench mark is a disk set in NW corner of a sea wall at the Golden Gate National Park at the Gulf of Farallons National Marine Sanctuary headquarters, 62 m (204 ft) west of the inshore end of the pier, 45.87 m (150.5 ft) NW of a flag pole, 21.64 m (71.0 ft) NE of the north corner of Building S.F. 19.4 (paint shop and storage building), and 1.22 m (4.0 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1948 DESIGNATION: CLARK RM 2 ALIAS: 941 4290 TIDAL 183 MONUMENTATION: Triangulation Station disk VM#: 975 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0700 SETTING CLASSIFICATION: Sea wall OPUS PID: LATITUDE: 37° 48.5' N ( 37.80856) LONGITUDE: 122° 28.2' W (-122.47078) The bench mark is a disk set flush in the top of a sea wall west of the public fishing pier, 11.43 m (37.5 ft) west of the west edge of the pier, 8.08 m (26.5 ft) NE of the NE corner of corrugated iron building No. 985, and about 0.91 m (3.0 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: CLARK 1948 DESIGNATION: CLARK ALIAS: 941 4290 TIDAL 185 MONUMENTATION: Triangulation Station disk VM#: 976 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0698 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 37° 48.5' N ( 37.80861) LONGITUDE: 122° 28.3' W (-122.47094) The bench mark is a disk set in the top of a concrete sea wall west of the public fishing pier, about 549 m (1800 ft) NW of the Gulf of Farallons National Marine Sanctuary headquarters in Golden Gate National Park, 24.23 m (79.5 ft) west of the west edge of the pier, 6.86 m (22.5 ft) NE of the NW corner of corrugated iron building No. 985, 3.05 m (10.0 ft) west of the NW corner of a stucco paint locker building, and 1.07 m (3.5 ft) above ground. BENCH MARK STAMPING: 4290 K 1976 DESIGNATION: 941 4290 K TIDAL MONUMENTATION: Tidal Station disk VM#: 978 AGENCY: National Ocean Service (NOS) IDB PID#: HT2255 SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 37° 48.5' N ( 37.80842) LONGITUDE: 122° 28.3' W (-122.47147) The bench mark is a disk set vertically in bedrock on the south side of Marine Drive, 24 m (79 ft) SSW of the SE corner of the National Park Service building # T989, 14.69 m (48.2 ft) NW of bench mark BM 174 1925, and 2.44 m (8.0 ft) south of the road curb.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4290 L 1976 DESIGNATION: 941 4290 L TIDAL MONUMENTATION: Tidal Station disk VM#: 979 AGENCY: National Ocean Survey (NOS) IDB PID#: HT2253 SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 37° 48.5' N ( 37.80883) LONGITUDE: 122° 28.4' W (-122.47283) The bench mark is a disk set in bedrock on the south side of Marine Drive, 114 m (375 ft) west of the National Park Service building # T989, 15.70 m (51.5 ft) SE of the eastern-most concrete and steel safety chain stanchion on the seawall, 7.77 m (25.5 ft) from the centerline of Marine Drive, and 1.22 m (4 ft) above street level. BENCH MARK STAMPING: 4290 M 1982 DESIGNATION: 941 4290 M TIDAL MONUMENTATION: Tidal Station disk VM#: 980 AGENCY: National Ocean Survey (NOS) IDB PID#: HT3538 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 37° 48.2' N ( 37.80328) LONGITUDE: 122° 28.0' W (-122.46667) The bench mark is a disk set flush in concrete foundation in front of Stilwell Hall (buiding # 650) on Mason Street, 27.34 m (89.7 ft) south of the centerline of Mason street, 10.30 m (33.8 ft) east of the NE corner of the west wing of the Stilwell Hall, 6.07 m (19.9 ft) west of the west edge of the sidewalk leading to the entrance of Stilwell Hall, 0.30 m (1.0 ft) SE of the NW corner of the foundation, and 0.12 m (0.4 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM 175 1925 DESIGNATION: 941 4290 TIDAL 175 ALIAS: TIDAL 175 MONUMENTATION: Tidal Station disk VM#: 1829 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HT0696 SETTING CLASSIFICATION: Sea wall OPUS PID: LATITUDE: 37° 48.5' N ( 37.80886) LONGITUDE: 122° 28.3' W (-122.47206) The bench mark is a disk set in top surface of the sea wall, near the National Park Service building at the intersection of the pavement and the seawall, 65.23 m (214.0 ft) NE of bench mark 4290 L 1976, 58.67 m (192.5 ft) west from the NW corner of the National Park Service building, 28.90 m (94.8 ft) WNW of the northern-most post of pedestrian gate, 6.86 m (22.5 ft) north of the centerline of Marine Drive, and 0.73 m (2.4 ft) south from the north edge of the sea wall. BENCH MARK STAMPING: 4290 N 1995 DESIGNATION: 941 4290 N MONUMENTATION: Tidal Station disk VM#: 15436 AGENCY: National Ocean Service (NOS) IDB PID#: AE5209 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 37° 48.3' N ( 37.80561) LONGITUDE: 122° 28.0' W (-122.46692) The bench mark is a disk set in a concrete seawall in Golden Gate National Park at the Gulf of Farallons National Marine Sanctuary headquarters, near an inshore end of a walkway leading to a pier, 13.70 m (44.9 ft) north of bottom of stairs leading to the Sanctuary building, 3.96 m (13.0 ft) east of a step in seawall, and 3.20 m (10.5 ft) west of the center of the walkway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) T I D A L D A T U M S Tidal datums at SAN FRANCISCO based on: LENGTH OF SERIES: 19 Years TIME PERIOD: January 1983 - 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 (01/27/1983) = 2.640 MEAN HIGHER HIGH WATER MHHW = 1.780 MEAN HIGH WATER MHW = 1.595 MEAN TIDE LEVEL MTL = 0.970 MEAN SEA LEVEL MSL = 0.951 MEAN LOW WATER MLW = 0.346 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.018 LOWEST OBSERVED WATER LEVEL (12/17/1933) = -0.877 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 180 1936 3.972 2.378 BM 174 1925 5.013 3.418 BM 176 1925 4.814 3.219 181 1945 3.987 2.392 NO 2 1948 4.221 2.626 CLARK 1948 4.233 2.639 4290 K 1976 5.828 4.234 4290 L 1976 6.620 5.025 4290 M 1982 3.705 2.111 BM 175 1925 4.160 2.566 4290 N 1995 3.646 2.051
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 10 Station ID: 9414290 PUBLICATION DATE: 04/21/2003 Name: SAN FRANCISCO CA NOAA Chart: 18649 Latitude: 37° 48.4' N ( 37.80670) USGS Quad: SAN FRANCISCO NORTH Longitude: 122° 27.9' W (-122.46500) 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.