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Details for Benchmark: HT2473

N 37° 45.958 W 122° 14.167 (NAD 83)

Altitude: 20

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
BROAD VISTA 1947
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

Reference Points

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Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (SPH) STATION IS LOCATED IN THE NORTH-EASTERN PART OF THE CITY OF ALAMEDA, IN THE SIDEWALK, 8 FEET SOUTH OF THE SOUTH CURB OF BUENA VISTA AVE., AND 10 FEET EAST OF THE EAST CURB OF BROADWAY. MARKED BY A STANDARD TRAVERSE STATION DISK, STAMPED BROAD VISTA 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.
01/01/1974 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (CLN) THE MARK WAS RECOVERED IN GOOD CONDITION AND THE 1947 DESCRIPTION IS ADEQUATE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--AT ALAMEDA
01/01/1986 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1986 (RJS) 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 orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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