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Details for Benchmark: JC0119

N 38° 31.650 W 090° 02.533 (NAD 83)

Altitude: 549.91

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

Location:
In ST CLAIR county, IL View Original Datasheet
Designation:
K 114
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 doubt that this mark is still around. We searched the coordinates listed and found only newer construction and well kept newer landscaping. We do want to give this another try just to make sure though.

C4

Went to the coordinates and found a large grassy area between buildings... no railroad track here... Wondering if the semi-recent development in this area destroyed it....

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 4.3 MI SE FROM CENTERVILLE. 4.3 MILES SOUTHEAST ALONG THE ILLINOIS CENTRAL RAILROAD FROM THE CROSSING OF STATE HIGHWAY 157 AT CENTERVILLE, ST. CLAIR COUNTY, 50 FEET SOUTH OF A ROAD CROSSING, 22 FEET EAST OF THE CENTERLINE OF THE SOUTH-BOUND TRACK, AND 20 FEET NORTH OF A POLE. A STANDARD DISK, STAMPED K 114 1935 AND SET IN THE TOP OF A CONCRETE POST PROJECTING 4 INCHES ABOVE GROUND.

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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