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Details for Benchmark: AA8639

N 38° 36.674 W 090° 21.539 (NAD 83)

Altitude: 457

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

Location:
In ST LOUIS county, MO View Original Datasheet
Designation:
SL-12
Marker Type:
survey 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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As mentioned in AA8640, this one is gone. I looked, but the street and immediate area was extensively redone about 10 years ago. AA8640 was set to replace it.

[last edit: 10/16/2002 7:37:57 PM PST]

Documented History (by the NGS)

01/01/1990 by MODNR (MONUMENTED)
DESCRIBED BY MO DEPT OF NAT RES 1990 STATION, AZIMUTH MARKS AND REFERENCE TIES THE STATION IS IN FRONT OF THE ROCK HILL LUMBER COMPANY AT 9267 MANCHESTER ROAD (MO HWY 100). IT IS JUST NORTH OF THE ASPHALT SHOULDER, 5.60 FT (1.71 M) NORTH OF THE 4 FT (1.2 M) CONCRETE GUTTER SECTION, 18.36 FT (5.60 M) NE OF AN ALUMINUM NAIL AND SHINER IN THE NORTH SIDE OF A POWER POLE, 31.87 FT (9.71 M) SE OF CENTER OF A 6 IN X 8 IN WOODEN SIGN POST, 67.70 FT (20.64 M) SW OF THE EASTERLY END POST OF A WOOD RAIL POST, 63.17 FT (19.25 M) SW OF AN ALUMINUM NAIL AND SHINER IN THE SOUTH SIDE OF A POWER POLE, 2 FT (0.6 M) WEST OF A CARSONITE WITNESS POST, AND 150.0 FT (45.7 M) SE OF THE EDGE OF A LUMBER COMPANY BUILDING. THE AZIMUTH MARK IS ABOUT 1/4 MILE SOUTHWESTERLY IN THE SE ANGLE OF THE TRAFFIC LIGHT INTERSECTION OF MANCHESTER ROAD AND ROCK HILL ROAD. IT IS 1.39 FT (0.42 M) ESE OF THE EDGE OF A SIDEWALK, 5.67 FT (1.73 M) ESE OF BACK OF CURB, 5.48 FT (1.67 M) SE OF AN ALUMINUM NAIL AND SHINER IN THE NE SIDE OF A POWER POLE, 24.93 FT (7.60 M) SSW OF THE WEST CORNER OF A TRAFFIC SIGNAL CONTROL BOX, 26.48 FT (8.07 M) NORTH OF THE CENTER OF A GAS VALVE BOX IN THE SIDEWALK, 17.30 FT (5.27 M) WEST OF SOUTH POST DEPARTMENT OF REVENUE SIGN, AND 2 FT (0.6 M) SW OF A CARSONITE WITNESS POST STATION AND AZIMUTH MARK TO REACH TO REACH THE AZIMUTH MARK FROM THE CENTER OF I-44 EXIT 280 (ELM AVENUE) GO NORTH ON ELM FOR 0.85 MILES (1.37 KM) TO LOCKWOOD AVE, TURN LEFT AND GO WEST ON LOCKWOOD FOR 0.4 MILES (0.6 KM) TO ROCK HILL ROAD, TURN RIGHT AND GO NORTH ON ROCK HILL FOR 1.1 MILES (1.8 KM) TO AZIMUTH MARK ON RIGHT IN SE QUADRANT OF TRAFFIC LIGHT INTERSECTION WITH MANCHESTER ROAD (MO HWY 100) AS DESCRIBED. TO REACH THE STATION FROM THE AZIMUTH MARK GO NORTHEASTERLY ON MANCHESTER ROAD FOR 0.25 MILES (0.40 KM) TO STATION SITE ON LEFT (NORTH) SIDE OF ROAD IN FRONT OF ROCK HILL LUMBER COMPANY AT 9267 MANCHESTER ROAD AS DESCRIBED. STATION SL-12 HAS BEEN DESTROYED. SEE DESCRIPTION FOR SL-12-2. DATE OF REPORT 06-06-1995

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in February 2000.
  • The orthometric height was determined by GPS observations and a high-resolution geoid model.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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