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Details for Benchmark: HS3031

N 37° 20.683 W 121° 52.467 (NAD 83)

Altitude: 98.6

Coordinates may not be exact. Altitude is VERTCON and location is SCALED. (more info)

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
T 878
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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No Access. A six-foot ivy-covered chain link fence topped with 3 strands of barbed wire surround the 17th Street Booster Station of the San Jose Water Works. HS3033, JG 4 is also here. The coordinates are identical.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 AT SAN JOSE. AT SAN JOSE, ABOUT 140 YARDS NORTHWEST OF THE CENTER OF THE INTERSECTION OF EAST SANTA CLARA AND NORTH 17TH STREETS, AT SAN JOSE WATER WORKS 17TH STREET BOOSTER STATION BUILDING, SET VERTICALLY IN THE NORTHEAST CONCRETE FOUNDATION, 1.0 FOOT SOUTHEAST OF THE NORTH CORNER, 73.1 FEET SOUTHWEST OF WELL 4, AND 0.5 FOOT ABOVE THE GROUND.
01/01/1969 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1969 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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