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Details for Benchmark: HS3134

N 37° 16.667 W 121° 56.917 (NAD 83)

Altitude: 216.4

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
RV 2735 CAGS
Marker Type:
rivet
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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this benchmark is located in a campbell lumberyard, but is now buried under several layers of tar. [i was looking around for it in the exact spot it would have been, but one of the guys there said] they repave over the lot so often [that it wouldn't be possible to find]

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1948 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1948 0.6 MI SW FROM CAMPBELL. ALONG THE SOUTHERN PACIFIC CO. RAILROAD FROM THE STATION AT CAMPBELL, ABOUT 400 FEET NORTH OF CROSSING L51.4 (CASEY ROAD), 139.2 FEET NORTH OF SIGNAL 51.3, 87.5 FEET SOUTH OF HAND OPERATED SWITCH 889, 39.4 FEET EAST OF EAST RAIL, SET IN THE TOP OF THE SOUTHWEST WING WALL OF THE SOUTH ABUTMENT OF AN ABANDONED RAILROAD BRIDGE, A MONEL METAL RIVET DRILLED IN ABOUT LEVEL WITH GROUND.
01/01/1954 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1954 MARK NOT FOUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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.