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Details for Benchmark: AT0288

N 29° 56.783 W 089° 59.417 (NAD 83)

Altitude: 1.7

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

Location:
In ST BERNARD county, LA View Original Datasheet
Designation:
D 3155 LAGS
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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Documented History (by the NGS)

Unknown by LAGS (MONUMENTED)
01/01/1964 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1964 1.05 MI NW FROM CHALMETTE. ABOUT 1.05 MILES NORTHWEST ALONG STATE HIGHWAY 39 FROM THE COURTHOUSE AT CHALMETTE, ABOUT 125 YARDS EAST OF A PAVED DRIVE LEADING SOUTH TO THE CHALMETTE MONUMENT, 13 1/2 SOUTH OF THE CENTER LINE OF THE EAST-BOUND TRAFFICE LANE OF THE HIGHWAY, 1 FOOT SOUTH OF THE SOUTH CURB OF THE HIGHWAY, 4 FEET NORTH OF A WITNESS POST, ABOUT LEVEL WITH THE HIGHWAY AND SET IN THE TOP OF A CONCRETE POST PROJECTING 1 INCH ABOVE THE LEVEL OF THE GROUND.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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