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Details for Benchmark: JC1179

N 38° 42.983 W 090° 13.050 (NAD 83)

Altitude: 441.52

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

Location:
In C OF ST LOUIS county, MO View Original Datasheet
Designation:
F 323
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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I could not find this metal rod. I looked on both sides of the trail for this one; not being sure which side of a North -- South levee was the North side. The area searched was near the six (6) mile marker on the St. Louis Riverfront bicycle trail. I even tried my cheap metal detector but with no success. This mark could easily be there and be overgrown.

Documented History (by the NGS)

01/01/1981 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981 IN ST LOUIS. IN ST LOUIS, 1.6 KILOMETERS (1.0 MILES) SOUTH ALONG THE MISSISSIPPI RIVER LEVEE FROM THE JUNCTION OF RIVERVIEW DRIVE AND THE BURLINGTON NORTHERN RAILROAD OVERPASS BRIDGE IN THE NORTHEAST SECTION OF ST. LOUIS TO THE MARK ON THE RIGHT, 3.66 METERS (12.0 FEET) NORTH OF THE CENTER OF THE LEVEE ROAD, AND 0.35 METERS (1.15 FEET) NORTH OF A METAL WITNESS POST. THE MARK IS 0.35 METERS S FROM A WITNESS POST. THE MARK IS 0.2 M BELOW LEVEE.
03/24/1991 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1991 (JNC) MARK NOT FOUND.

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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