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Details for Benchmark: JC1174

N 38° 39.867 W 090° 11.217 (NAD 83)

Altitude: 423.11

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:
L 323
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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I did not find this benchmark. It is not obvious to me so it is a DNF. I am leery of spending a lot of time examining bridges right now!

Documented History (by the NGS)

01/01/1981 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1981 IN ST LOUIS. IN ST LOUIS, AT THE JUNCTION OF THE ROAD ALONG THE MISSISSIPPI RIVER RETAINING WALL AND THE MCKINLEY OVERPASS BRIDGE, SOUTH OF THE FIRST SET OF PIERS EAST OF THE BURLINGTON NORTHERN RAILROAD TRACKS, 3.96 METERS (13.0 FEET) EAST OF THE CENTER OF THE ROAD, 10.88 METERS (35.7 FEET) EAST OF THE EAST RAIL OF THE MOST EAST SET OF TRACKS, AND 1.83 METERS (6.0 FEET) SOUTH OF THE SOUTH PIER. THE MARK IS 0.5 METERS W FROM A WITNESS POST. THE MARK IS ABOVE LEVEL WITH ROAD.
03/26/1991 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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