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Details for Benchmark: HS3235

N 37° 18.300 W 121° 52.683 (NAD 83)

Altitude: 131.3

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
G 877
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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Still there but generally not a good benchmark to hunt for on a working rail overcrossing.

[Photos:]
photoHS3235
N 37° 18.303 W 121° 52.711

This one was a bit of an adventure to find. it was next to one of the gaurd rails on a railroad bridge. While we were getting ready to walk down the bridge a commuter train came whizzing past. This is the line that runs from Gilroy all the way up to San Francisco. The Benchmark is in fair condition.

[Photos:]
photoBenchmark HS3235
photoLooking South towards the Benchmark
photoCommuter Train

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 AT SAN JOSE. AT SAN JOSE, 2.2 MILES SOUTHEAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION, AT CONCRETE BRIDGE 49.28 OVER ALMADEN ROAD, IN THE TOP OF THE WEST END OF THE SOUTH CONCRETE ABUTMENT, 18.4 FEET WEST OF THE WEST RAIL, 1.6 FEET SOUTHWEST OF THE SOUTHWEST CORNER OF THE STEEL BANNISTER, AND ABOUT LEVEL WITH THE TRACK.
01/01/1967 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1967 RECOVERED IN GOOD CONDITION.
05/04/1991 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1991 (JB) 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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.