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Details for Benchmark: HS3047

N 37° 21.850 W 121° 49.850 (NAD 83)

Altitude: 155.8

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
QQ 886 RESET 1951
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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In spite of the fact that this one was supposedly found a couple days ago (no photo included), I think it was destroyed when the fire station was rebuilt 3-4 years ago.

Found as described. Firefighters were washing a vehicle and I didn't want to disturb them so no closeup or coords, but it would be close to .864' .892' which is NW of the listed coords, across Alum Rock from the listed coords.

[Photos:]
photoHS3047 zoom
photoWider shot

Documented History (by the NGS)

01/01/1951 by CGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 AT ALUM ROCK. AT ALUM ROCK, AT THE T JUNCTION OF ALUM ROCK AVENUE AND CEDAR LANE LEADING NORTHWEST, AT THE SOUTH CORNER OF JAMES LICK HIGH SCHOOL YARD, AT ALUM ROCK FIRE STATION, SET VERTICALLY IN THE SOUTHEAST CONCRETE BLOCK WALL, 0.6 FOOT NORTHEAST OF THE SOUTH CORNER, AND 4.1 FEET ABOVE THE ASPHALT DRIVE.
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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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