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Details for Benchmark: CM0374

N 32° 27.617 W 084° 59.967 (NAD 83)

Altitude: 258.48

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

Location:
In RUSSELL county, AL View Original Datasheet
Designation:
M 21
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)
01/01/1950 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1950 AT GIRARD. AT GIRARD, RUSSELL COUNTY, 7 RAILS SOUTHEAST OF THE CENTRAL OF GEORGIA RAILWAY STATION, 15 RAILS SOUTHEAST OF THE SOUTH END OF THE TRESTLE OVER CHATTAHOOCHE RIVER, AT THE ALABAMA-GEORGIA STATE LINE, 29 FEET SOUTHEAST OF THE TRACK, 1-1/2 FEET SOUTHEAST OF THE CORNER OF A CREOSOTED PLANK PIT FOR A GAS MAIN SHUT-OFF VALVE. A STANDARD DISK, STAMPED M 21 1934 AND SET IN THE TOP OF A CONCRETE POST.

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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