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Details for Benchmark: HT0032

N 37° 45.810 W 122° 14.290 (NAD 83)

Altitude: 27.4

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

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

Reference Points

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Found this one at 1150 today!

[Photos:]
photo0502071150 Broad SC.jpg

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (SPH) STATION IS LOCATED IN THE EAST-CENTRAL PART OF THE CITY OF ALAMEDA, IN THE SIDEWALK, 5 FEET NORTH OF THE NORTH CURB OF SANTA CLARA AVE., AND 10 FEET EAST OF THE EAST CURB OF BROADWAY. MARKED BY A STANDARD TRAVERSE STATION DISK, STAMPED CLARA BROAD 1947, SET IN TOP OF A CONCRETE POST 6 INCHES SQUARE AT THE TOP, 6 BY 10 INCHES AT THE BOTTOM, AND 30 INCHES LONG. THE MARK IS ABOUT 10 INCHES BELOW THE SURFACE OF THE SIDEWALK, AND IS ACCESSIBLE THROUGH A SMALL MANHOLE COVERED WITH A CITY OF OAKLAND IRON LID.
01/01/1951 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1951 AT ALAMEDA. AT ALAMEDA, AT THE NORTHEAST CORNER OF THE INTERSECTION OF BROADWAY AND SANTA CLARA AVENUE, 1.7 FEET SOUTH OF THE CENTER LINE OF THE NORTH SIDEWALK OF SANTA CLARA AVENUE, 1.1 FEET EAST OF THE CENTER LINE OF THE EAST SIDEWALK OF BROADWAY, 0.9 FOOT BELOW THE SIDEWALK SURFACE, AND ENCASED IN AN 8-INCH IRON PIPE WITH A CAST IRON COVER FLUSH WITH THE SIDEWALK.
01/01/1963 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963 RECOVERED IN GOOD CONDITION.
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (RJS) RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (RAS) RECOVERED IN GOOD CONDITION.
09/30/1988 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1988 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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