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Details for Benchmark: BL2077

N 30° 04.561 W 094° 04.428 (NAD 83)

Altitude: 11.4

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

Location:
In JEFFERSON county, TX View Original Datasheet
Designation:
MAGNOLIA
Marker Type:
triangulation station disk
Setting:
set into the top of a metal pipe driven into the ground
Stability:

Reference Points

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Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 (ERM) STATION IS LOCATED ON THE S BANK OF THE NECHES RIVER, ON THE PROPERTY OF THE MAGNOLIA REFINING COMPANY, 47 METERS FROM THE RIVER, 3 METERS SW OF BOILERHOUSE 7, AND 75 METERS SE OF THE COKE LOADING CHUTE. IT IS IN THE GRASSY PLOT BETWEEN THE PARKING SPACE AND THE BOILERHOUSE. STATION MARK IS A BRONZE DISK SET IN CONCRETE AT THE CENTER OF THE TOP OF A TILE. R.M.S ARE IN GRASS PLOT TO NE AND NEAR E CORNER OF PUMPHOUSE. BRONZE DISKS IN CONCRETE. 11A. AZIMUTH MARK IS A 3/4-INCH LAG BOLT SET IN AN 8- BY 8-INCH CONCRETE PIER. IT IS LOCATED 40 METERS SW OF THE BOATHOUSE ON OIL LEVEE. HEIGHT OF LIGHT ABOVE STATION MARK - 18 METERS.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in February 1996.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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