U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 05/19/1982 Station ID: 9414867 SUPERCEDED DATE: 04/21/2003 Name: BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER CALIFORNIA NOAA Chart: 18661 Latitude: 38° 56.2' N USGS Quad: STOCKTON Longitude: 121° 20.0' W To reach the tidal bench marks proceed east on Highway 4 towards Stockton, stopping just before the bridge over San Joaquin River, left off road through a gate into sewage pond yard, east to southeast corner of yard then north along levee road on west bank of river to Bascule Railroad bridge. The tide gage and staff were located on the railroad bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4867 A 1978 MONUMENTATION: Survey Disk VM#: 10575 AGENCY: PID#: AE9895 SETTING CLASSIFICATION: Copper-Coasted Steel Rod The bench mark is set on a copper rod driven 47 feet to refusal, encased in PVC pipe and concrete (extends 1.4 feet above grade), along gravel road at east edge of Stockton Tertiary Sewage Pond yard, at intersection of San Joaquin River and at the Southern Pacific Company railway tracks, 9 feet east northeast of centerline of gravelled levee road on west side of San Joaquin River, and 3 feet west northwest of witness post. BENCH MARK STAMPING: 4867 C 1978 MONUMENTATION: Survey Disk VM#: 8467 AGENCY: PID: SETTING CLASSIFICATION: Copper-Coated Steel Rod The bench mark is set on a copper rod driven 46 feet to refusal, encased in PVC and concrete (extends 0.8 foot above grade), along gravelled road at east edge of Stockton Sewage Pond yard north of Highway 4, west of San Joaquin River, 190 feet east of sheet metal pumphouse, and 12 feet north of centerline of gravelled road on south side of the river
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 05/19/1982 Station ID: 9414867 SUPERCEDED DATE: 04/21/2003 Name: BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER CALIFORNIA NOAA Chart: 18661 Latitude: 38° 56.2' N USGS Quad: STOCKTON Longitude: 121° 20.0' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: SJ 141 BM 1955 SACTO DIST MONUMENTATION: Survey Disk VM#: 8468 AGENCY: PID#: HS0440 SETTING CLASSIFICATION: Concrete Curb The bench mark is set in top of east end of south concrete curb, 2 miles west along State Highway 4 from Southern Pacific railroad overpass at Stockton, at Garwood Bridge over the river, 15 feet south of centerline of highway, 2 feet north of north face of south concrete guardrail, and 0.5 foot above level of highway. BENCH MARK STAMPING: NO 1 1934 MONUMENTATION: Survey Disk VM#: 10572 AGENCY: PID#: HS0441 SETTING CLASSIFICATION: Abutment of Bridge The bench mark is set in top of northeast corner of the east abutment of Garwood Bridge over San Joaquin River, 3 miles west along State Highway 4 from Southern Pacific Company Railroad overpass at Stockton, 26.5 feet west of centerline of black top road leading north along top of levee, 15 feet north of centerline of highway, and level with highway. BENCH MARK STAMPING: NO 2 1934 MONUMENTATION: Survey Disk VM#: 10573 AGENCY: PID#: HS0439 SETTING CLASSIFICATION: Abutment of Bridge The bench mark is set in top of northeast corner of the west abutment of Garwood Bridge over San Joaquin River, 3 miles west along State Highway 4 from Southern Pacific Company Railroad overpass at Stockton, 17 feet east of center of west levee, 15 feet north of centerline of highway, 0.7 foot north of north edge of concrete pillar, and level with highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 05/19/1982 Station ID: 9414867 SUPERCEDED DATE: 04/21/2003 Name: BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER CALIFORNIA NOAA Chart: 18661 Latitude: 38° 56.2' N USGS Quad: STOCKTON Longitude: 121° 20.0' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 5 1948 MONUMENTATION: Survey Disk VM#: 10574 AGENCY: PID#: HS0442 SETTING CLASSIFICATION: Concrete Guardrail The bench mark is set in top of west end of north concrete guardrail at concrete bridge N0-20-51 over a dirt road, 3 miles west along State Highway 4 from Southern Pacific Company Railroad overpass at Stockton, 103 feet east of east end of Garwood Bridge, 103 feet east of Bench Mark N0 1 1934, 54.5 feet east of centerline of black top road leading north along levee, 14.5 feet north of centerline of highway, and 2.5 feet above level of highway. BENCH MARK STAMPING: 4867 B 1978 MONUMENTATION: Survey Disk VM#: 10576 AGENCY: PID: SETTING CLASSIFICATION: Copper-Coated Steel Rod The bench mark is set on a copper rod driven 42 feet to refusal, encased in PVC pipe (extends 1.2 feet above grade), along gravel road at east edge of Stockton Tertiary Sewage Pond yard north of Highway 4, 434 feet southeast along levee road from Bench Mark 4867 A 1978, 285 feet west northwest of sheet metal pumphouse, 8 feet north of centerline of gravelled levee road on south bank of river, and 3 feet west of witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 05/19/1982 Station ID: 9414867 SUPERCEDED DATE: 04/21/2003 Name: BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER CALIFORNIA NOAA Chart: 18661 Latitude: 38° 56.2' N USGS Quad: STOCKTON Longitude: 121° 20.0' W T I D A L D A T U M S Tidal datums at BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER based on: LENGTH OF SERIES: 12 MONTHS TIME PERIOD: SEPTEMBER1978-SEPTEMBER 1979 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: MEAN HIGHER HIGH WATER MHHW = 3.65 MEAN HIGH WATER MHW = 3.22 MEAN TIDE LEVEL MTL = 1.83 MEAN LOW WATER MLW = 0.44 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.03 MEAN LOWER LOW WATER MLLW = 0.00 * NGVD reference based on adjustment of 1967 and NOS levels of1978-1979. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 4867 A 1978 18.20 14.98 4867 C 1978 18.79 15.57 SJ 141 BM 1955 SACTO DIST 24.43 21.21 NO 1 1934 23.59 20.37 NO 2 1934 23.96 20.74 NO 5 1948 24.96 21.74 4867 B 1978 17.87 14.65
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 05/19/1982 Station ID: 9414867 SUPERCEDED DATE: 04/21/2003 Name: BORDEN HIGHWAY BRIDGE, SANJOAQUIN RIVER CALIFORNIA NOAA Chart: 18661 Latitude: 38° 56.2' N USGS Quad: STOCKTON Longitude: 121° 20.0' 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 (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 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.