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Details for Benchmark: HV2714

N 38° 48.933 W 077° 19.267 (NAD 83)

Altitude: 416.65

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

Location:
In FAIRFAX county, VA View Original Datasheet
Designation:
X 230
Marker Type:
bench mark disk
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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I took the family to go find this one. There has been a lot of construction on this intersection since the 1950's. 123 is now a divided highway and Zion Drive is almost 40 feet across. So it should be assumed that this Benchmark has been paved over.

[Photos:]
photoLooking North
photoLook East
photoSouthern View
photoGoing West

Documented History (by the NGS)

01/01/1941 by CGS (MONUMENTED)
01/01/1951 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1951 2.3 MI S FROM FAIRFAX. 2.3 MILES SOUTH ALONG STATE HIGHWAY 123 FROM THE COUNTY COURTHOUSE AT FAIRFAX, FAIRFAX COUNTY, AT THE JUNCTION OF A ROAD LEADING EAST, 46.7 FEET SOUTH OF THE CENTERLINE OF THE ROAD, 22 FEET EAST OF THE CENTERLINE OF THE HIGHWAY, AND 4.4 FEET SOUTH OF A WHITE WOODEN WITNESS POST. A STANDARD DISK, STAMPED X 230 1941 AND SET IN THE TOP OF A CONCRETE POST PROJECTING 3 INCHES ABOVE GROUND.
01/01/1960 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1960 MARK NOT FOUND.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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