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Details for Benchmark: CL0518

N 32° 42.917 W 083° 23.383 (NAD 83)

Altitude: 539.91

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

Location:
In TWIGGS county, GA View Original Datasheet
Designation:
H 276
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)

01/01/1962 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1962 3.8 MI NW FROM JEFFERSONVILLE. ABOUT 3.75 MILES NORTHWEST ALONG THE SEABOARD AIR LINE RAILROAD FROM THE STATION AT JEFFERSONVILLE, 0.35 MILE SOUTHEAST OF A GRADED ROAD CROSSING, 0.15 MILE SOUTHEAST OF MILEPOST 19, NEAR THE SOUTHEAST END OF A SMALL CUT, 127.5 FEET SOUTHWEST OF AND ACROSS U.S. HIGHWAY 80 FROM THE SOUTHWEST RAIL, 39 FEET SOUTHWEST OF THE CENTER LINE OF THE HIGHWAY, 40 FEET EAST OF REA POWER LINE POLE NO. 6-334, 3 FEET NORTHWEST OF A TELEPHONE POLE, IN LINE WITH ROW OF POLES, 1.4 FEET SOUTHEAST OF A STEEL WITNESS POST, 2 FEET ABOVE THE LEVEL OF THE HIGHWAY AND SET IN THE TOP OF A CONCRETE POST PROJECTING 3 INCHES ABOVE THE LEVEL OF THE GROUND.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 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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