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Details for Benchmark: HT0029

N 37° 46.217 W 122° 14.233 (NAD 83)

Altitude: 11.9

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
RV 2
Marker Type:
rivet
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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No luck.

Documented History (by the NGS)

Unknown by CA-001 (MONUMENTED)
01/01/1963 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1963 AT ALAMEDA. AT ALAMEDA, IN R3W T2S, AT THE INTERSECTION OF PARK STREET AND BLANDING AVENUE, AT THE SOUTHWEST END OF PARK STREET BRIDGE OVER A CHANNEL, ALONG THE CENTERLINE OF THE STREET, 44.2 FEET NORTHEAST OF THE NORTHEAST RAIL OF A RAILROAD TRACK, CEMENTED IN THE TOP OF A CONCRETE POST 0.5 FOOT BELOW THE SURFACE OF THE STREET, AND BENEATH A CAST IRON COVER INSCRIBED MONUMENT.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (RAS) RECOVERED IN GOOD CONDITION.
10/11/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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