U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9415111 PUBLICATION DATE: 06/09/2003 Name: BENICIA, CARQUINEZ STRAIT CA NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330) USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000) To reach the tidal bench marks from Interstate 780 in Benicia, take the 5th Street exit and proceed south for 2 blocks, turn left on M Street, then right on Grant Street at Port of Benicia. The bench marks are located at Port of Benicia Wharf and along Bayshore Road. The tide gage and staff were located on the east side of the Wharf. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9 1948 DESIGNATION: 941 5111 TIDAL 9 MONUMENTATION: Tidal Station disk VM#: 8554 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0141 SETTING CLASSIFICATION: Sea wall OPUS PID: LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.9' W (-122.13200) The primary bench mark is a disk set at the junction of the seawall and the wooden handrail which follows the road and railroad tracks to shore, 13 m (42 ft) north of the easternmost of two bollards, 12 m (39 ft) south of the north end of the seawall, 8.63 m (28.3 ft) SE of a fire hydrant protected by red pipes, and 0.91 m (3 ft) north of the south end of the sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9415111 PUBLICATION DATE: 06/09/2003 Name: BENICIA, CARQUINEZ STRAIT CA NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330) USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: D 790 1946 DESIGNATION: 941 5111 D 790 MONUMENTATION: Tidal Station disk VM#: 8553 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: JT0134 SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 38° 2.9' N ( 38.04830) LONGITUDE: 122° 7.7' W (-122.12800) The bench mark is a disk set in the top of a concrete base supporting the fourth steel leg east of the west end of the Southern Pacific Railroad bridge, 23 m (75 ft) east of the centerline of Bayshore Drive, 6 m (20 ft) west of the shoreline, 0.15 m (0.5 ft) west of the east edge of the concrete base, and 0.46 m (1.5 ft) above the ground. BENCH MARK STAMPING: 5111 D 1976 DESIGNATION: 941 5111 D MONUMENTATION: Tidal Station disk VM#: 8556 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000) The bench mark is a disk located near the NE end of Port of Benicia Wharf at Gate #23, 54 m (177 ft) south of the centerline of Bayshore Road, 44.90 m (147.3 ft) NW of the corner of Building 54, 4.54 m (14.9 ft) WSW of the center of Gate #23, 0.70 m (2.3 ft) south of a fire hydrant, and 1 m (2 ft) SW of a witness post and sign. The bench mark is crimped to the top of a copper-clad steel rod driven 4.6 m (15 ft) to refusal.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9415111 PUBLICATION DATE: 06/09/2003 Name: BENICIA, CARQUINEZ STRAIT CA NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330) USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5111 E 1976 DESIGNATION: 941 5111 E MONUMENTATION: Tidal Station disk VM#: 8557 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000) The bench mark is a disk located on the northern side of Bayshore Road between Oak Road and the Benicia-Martinez highway bridge, 62 m (202 ft) NW of the intersection of Bayshore and Oak Roads, 20.57 m (67.5 ft) north of the northernmost rail of three railroad tracks, 14.51 m (47.6 ft) NW of the centerline of Bayshore Road, 1.07 m (3.5 ft) from telephone pole KOPPERS FP 70 W6 4-50, and 0.46 m (1.5 ft) SE of a fence surrounding the Toyota storage lot. The bench mark is set 0.24 m (0.8 ft) above the ground, crimped to the top of a copper-clad steel rod driven 9.5 m (31 ft) to refusal and encased in a PVC pipe. BENCH MARK STAMPING: 5111 C 1988 DESIGNATION: 941 5111 C MONUMENTATION: Tidal Station disk VM#: 8558 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete embankment OPUS PID: LATITUDE: 38° 2.6' N ( 38.04330) LONGITUDE: 122° 7.8' W (-122.13000) The bench mark is a disk set in a drill hole in the top SW corner of a 1.52 m (5.0 ft) wide concrete embankment near the NE end of the Benicia Industrial Park, 70 m (230 ft) SW of the pipelines that cross the road, 50 m (164 ft) NNW from bench mark 5111 D 1976, 2.99 m (9.8 ft) from the northern edge of Bayshore Drive, and 1.22 m (4.0 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9415111 PUBLICATION DATE: 06/09/2003 Name: BENICIA, CARQUINEZ STRAIT CA NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330) USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000) T I D A L D A T U M S Tidal datums at BENICIA, CARQUINEZ STRAIT based on: LENGTH OF SERIES: 5 Years TIME PERIOD: January 1977 - December 1981 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9415144 PORT CHICAGO, SUISUN BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (02/21/1980) = 2.239 MEAN HIGHER HIGH WATER MHHW = 1.623 MEAN HIGH WATER MHW = 1.462 MEAN SEA LEVEL MSL = 0.866 MEAN TIDE LEVEL MTL = 0.864 MEAN LOW WATER MLW = 0.265 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum NAVD88 = -0.195 LOWEST OBSERVED WATER LEVEL (05/02/1980) = -0.532 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9 1948 4.534 3.072 D 790 1946 3.902 2.440 5111 D 1976 3.068 1.606 5111 E 1976 3.553 2.091 5111 C 1988 4.605 3.143
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9415111 PUBLICATION DATE: 06/09/2003 Name: BENICIA, CARQUINEZ STRAIT CA NOAA Chart: 18657 Latitude: 38° 2.6' N ( 38.04330) USGS Quad: BENICIA Longitude: 122° 7.8' W (-122.13000) 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.