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Details for Benchmark: HS3228

N 37° 19.050 W 121° 53.400 (NAD 83)

Altitude: 117.2

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
F 877
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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This is on an active railroad line, but there was no fence on the SE side, and a clear path to the top of the RR overpass, so I went up to take a careful look. It appears that the overpass has been widened from its original state, or a second set of rails added at least. As there are two sets of tracks here now, and it is no longer possible to be "21.8 FEET SOUTH OF THE SOUTH RAIL" without floating in space. There is a long, rectangular concrete block between the tracks, but it looks too high to be the place the benchmark was set, and in any case there's certainly no benchmark set in the top anywhere.

The disk could still be there, under the gravel, wood planks, etc. but people shouldn't be loitering between the tracks digging around. The benchmark is likely gone.

[Photos:]
photoSouthern Pacific Lines
photoOther side of SP sign: Prevost Street
Confirms this is the right place, in general.
photoWider shot showing location
This is how things currently look. Stay off these lines, they're still active.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 AT SAN JOSE. AT SAN JOSE, 1.1 MILES SOUTHEAST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION, AT A CONCRETE BRIDGE OVER PREVOST STREET, IN THE TOP OF THE EAST END OF THE SOUTH CONCRETE SIDEWALK, 21.8 FEET SOUTH OF THE SOUTH RAIL, 0.9 FOOT NORTH OF THE NORTH EDGE OF THE CONCRETE GUARDRAIL, AND ABOUT LEVEL WITH THE TRACK.
01/01/1967 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1967 RECOVERED IN GOOD CONDITION.
08/05/1995 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1995 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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.