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Details for Benchmark: HC0231

N 37° 11.867 W 090° 42.350 (NAD 83)

Altitude: 644.5

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

Location:
In WAYNE county, MO View Original Datasheet
Designation:
U 139
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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We found this but the concrete post was knocked over. We stood it up and took its picture. I don't know if it was where it was supposed to be or not.

[Photos:]
photoplatow
this is it

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 3.3 MI N FROM PIEDMONT. 3.3 MILES NORTH ALONG THE MISSOURI PACIFIC RAILROAD FROM THE STATION AT PIEDMONT, 90 FEET SOUTH OF THE SOUTH END OF THE PLATOW STATION, AT A ROAD CROSSING, 24 FEET SOUTH OF THE CENTERLINE OF THE ROAD, AND 18 FEET WEST OF THE CENTERLINE OF THE TRACK. A STANDARD DISK, STAMPED U 139 1935 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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