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Details for Benchmark: HS5030

N 37° 41.509 W 121° 47.013 (NAD 83)

Altitude: 0

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
LIVERMORE AIRWAY BEACON 448
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

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These Airway Beacons were obsolete by the start of WWII and most of them were dismantled so the steel in the towers could be used in the war effort. They were only 60 feet tall and the beacon at the top of the tower (the actual survey mark) was 24 inches in diameter.

Residential Development has wiped out any traces of this installation and the NOAA/USGS database now reports this mark as "Destroyed".

Trying to help out. Almost went to look for this. Copied this from description. 1968 (RMS) THE BEACON HAS BEEN REMOVED AND NOTHING REMAINS TO MARK ITS LOCATION. STATION LOST.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (SPH) THE STATION IS AIRWAY BEACON 448 (FLASHING GREEN AND WHITE), LOCATED ON THE U.S. NAVY AUXILLARY FLYING FIELD NEAR THE NORTHWEST EDGE OF LIVERMORE. IT IS 1/2 MILE NORTHWEST OF LIVERMORE, 0.2 MILE SOUTH OF U.S. HIGHWAY 50, 83 FEET EAST OF THE NORTHEAST CORNER OF THE MAIN HOUSE, AND 62 FEET WEST OF THE CENTER OF RINCON ROAD. THE BEACON TOWER IS APPROXIMATELY 53 FEET IN HEIGHT AND IS PAINTED IN ALTERNATE RED AND WHITE SECTIONS. TO REACH FROM THE LIVERMORE SIGN AT THE NORTH EDGE OF THE CITY GO WESTERLY ON U.S. HIGHWAY 50 FOR 0.5 MILE. TURN LEFT ONTO RINCON ROAD AND CONTINUE 0.2 MILE TO THE FLYING FIELD HOUSES AND BEACON ON RIGHT.
01/01/1963 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (IRR) THE STATION WAS RECOVERED IN GOOD CONDITION AND THE 1947 DESCRIPTION IS ADEQUATE.
01/01/1968 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1968 (RMS) THE BEACON HAS BEEN REMOVED AND NOTHING REMAINS TO MARK ITS LOCATION. STATION LOST.

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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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