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Details for Benchmark: FB1221

N 35° 34.317 W 083° 20.333 (NAD 83)

Altitude: 2444.2

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

Location:
In SWAIN county, NC View Original Datasheet
Designation:
M 57
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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Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 2 MI NW FROM SMOKEMONT. 2 MILES NORTHWEST ALONG STATE HIGHWAY 107 FROM SMOKEMONT, SWAIN COUNTY, OPPOSITE A WHITE HOUSE 1,000 FEET EAST OF THE HIGHWAY, 189 FEET NORTH OF A 24-INCH CORRUGATED IRON PIPE CULVERT, ON THE SOUTH EDGE OF A KNOLL, 40 FEET WEST OF THE CENTERLINE OF THE HIGHWAY, AND 3 FEET HIGHER THAN THE HIGHWAY. A STANDARD DISK, STAMPED M 57 1934 AND SET IN THE TOP OF A CONCRETE POST.
01/01/1963 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1963 RECOVERED IN GOOD CONDITION.

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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