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Details for Benchmark: AT1369

N 29° 56.529 W 089° 59.670 (NAD 83)

Altitude: 7

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

Location:
In ST BERNARD county, LA View Original Datasheet
Designation:
CHALMETTE 3
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Documented History (by the NGS)

01/01/1966 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1966 (LMC) DISTANCE FOR CHALMETTE MONUMENT 1873 WAS NOT MEASURED. STATION IS LOCATED ABOUT 6 MILES EAST OF DOWN-TOWN BUSINESS SECTION OF NEW ORLEANS, 1 1/2 MILES WEST OF CHALMETTE, 1/2 MILES SOUTH OF STATE HIGHWAY 39, JUST NORTH OF NORTH BANK OF MISSISSIPPI RIVER AND ON GOVERNMENT PROPERTY OPERATED BY NATIONAL PARK SERVICE. STATION MARK, A STANDARD DISK STAMPED CHALMETTE 3 1966, IS SET IN THE TOP OF A CONCRETE CYLINDER WHICH IS SET ABOUT 3 INCHES BELOW SURFACE OF GROUND. THE MARK IS 133 FEET SOUTHWEST OF SOUTHWEST CORNER OF GRANITE FOUNDATION OF MONUMENT, 48.8 FEET WEST OF CENTER OF SIDE WALK, 29.8 FEET NORTHWEST OF NORTHWEST CORNER OF PARKING AREA AND 26.2 FEET EAST OF EAST CURB OF DRIVE. REFERENCE MARK 1, A STANDARD DISK STAMPED CHALMETTE ECC NO 1 1931, IS CEMENTED IN A DRILL HOLE IN BOTTOM STEP OF MONUMENT FOUNDATION WHICH PROJECTS ABOUT 1 FOOT ABOVE THE SURFACE OF GROUND. THE MARK IS 58 FEET EAST OF CENTER OF CIRCLE DRIVE, 57.5 FEET NORTH OF CENTER OF CIRCLE DRIVE AND 20 FEET WEST OF CENTER OF SIDEWALK. REFERENCE MARK 3, A STANDARD DISK STAMPED CHALMETTE 3 NO 3 1966, IS CEMENTED IN A DRILL HOLE IN CONCRETE CULVERT HEADWALL WHICH PROJECTS ABOUT 1 FOOT ON WEST SIDE AND IS 1.5 FEET LOWER IN ELEVATION THAN ROAD. THE MARK IS 93 FEET NORTH OF CENTER OF WOODEN BRIDGE, 27 FEET EAST OF CENTER OF EAST SIDE OF CIRCLE DRIVE AND 10.4 FEET EAST OF EAST EDGE OF SIDEWALK. AZIMUTH MARK, A STANDARD DISK STAMPED CHALMETTE 3 1966, IS CEMENTED IN A DRILL HOLE IN EAST CONCRETE HEADWALL OF CULVERT WHICH IS ABOUT 2 FEET LOWER IN ELEVATION THAN THE ROAD. THE MARK IS 39 FEET SOUTH OF CENTER OF EAST BOUND LANE OF STATE HIGHWAY 39, 20 FEET EAST OF ROAD LEADING TO CHALMETTE MONUMENT, 12.8 FEET NORTH OF THE NORTH END OF CHALMETTE BATTLEFIELD SIGN AND 1.4 FEET WEST OF WITNESS POST. AZIMUTH MARK IS LOCATED AT ENTRANCE TO CHALMETTE BATTLEFIELD AS DESCRIBED. HEIGHT OF LIGHT ABOVE STATION MARK 34 METERS.
01/01/1969 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (WHS) STATION MARK AND R.M. 1 WERE RECOVERED IN GOOD CONDITION. R.M. 3 NOR THE AZIMUTH MARK WERE SEARCHED FOR. THE 1966 DESCRIPTION IS ADEQUATE.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in January 1993.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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