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Details for Benchmark: EF1690

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N 34° 45.359 W 087° 24.331 (NAD 83)

Altitude: 586

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

Location:
In LAWRENCE county, AL View Original Datasheet
Designation:
40 10
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.

Reference Points

Nearest

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Didn 11/11/2005 maconart couldn't find EF1690 (NGS Benchmark)   Visit Log
The distance from a significant part of the descriptions was to great and the area was covered with high grass and mulch from several years of cutting. I was not able to locate it with the equipment I had.

Documented History (by the NGS)

1/1/1990 by ALHD (MONUMENTED)
DESCRIBED BY ALABAMA HIGHWAY DEPARTMENT 1990 THE STATION IS LOCATED IN LAWRENCE COUNTY ON THE EAST RIGHT OF WAY OF ALA 101, ABOUT 8.29 KM (5.15 MI) NORTH OF TOWN CREEK AND ABOUT 12.96 KM (8.05 MI) NORTHWEST OF COURTLAND. TO REACH THE STATION FROM THE JUNCTION OF ALA 101 AND ALA 184, MILE POST 20.95 ON ALA 101, DRIVE NORTH ON ALA 101 0.24 KM (0.15 MI) TO MILE POST 21.10 AND THE STATION ON THE RIGHT. THE STATION IS 14.11 M (46.29 FT) WEST - NORTHWEST OF A SERVICE POWER POLE, 14.42 M (47.31 FT) EAST OF THE CENTERLINE OF ALA 101, 27.68 M (90.81 FT) SOUTH - SOUTHWEST OF A TRANSFORMER POWER POLE, 33.77 M (110.79 FT) NORTH - NORTHWEST OF A POWER POLE, 35.88 M (117.72 FT) WEST - SOUTHWEST OF THE TOMBSTONE OF JUNE ALLEN 1868 - 1923, AND 36.36 M (119.29 FT) WEST - SOUTHWEST OF THE TOMBSTONE OF ELLA CARTER STELLE 1876 - 1945. STATION 40 - 11 1990 MAY BE USED AS AN AZIMUTH FOR THIS STATION.
7/25/1991 by ALHD (GOOD)
RECOVERY NOTE BY ALABAMA HIGHWAY DEPARTMENT 1991 THE STATION IS LOCATED IN THE NORTHERN END OF LAWRENCE COUNTY ON THE EAST RIGHT OF WAY OF ALA 101, ABOUT 8.29 KM (5.15 MI) NORTH OF TOWN CREEK AND ABOUT 12.96 KM (8.05 MI) NORTHWEST OF COURTLAND. TO REACH THE STATION FROM THE JUNCTION OF ALA 101 AND ALA 184, (MILE POST 20.95 ON ALA 101) ABOUT 8.03 KM (5.00 MI) NORTH OF TOWN CREEK, DRIVE NORTH ON ALA 101 FOR 0.24 KM (0.15 MI) TO MILE POST 21.10 AND THE STATION ON THE RIGHT. THE STATION IS 14.11 M (46.29 FT) WEST-NORTHWEST OF A SERVICE POWER POLE, 14.42 M (47.31 FT) EAST OF THE CENTERLINE OF ALA 101, 27.68 M (90.81 FT) SOUTH-SOUTHWEST OF A TRANSFORMER POWER POLE, 33.77 M (110.79 FT) NORTH-NORTHWEST OF A POWER POLE, 35.88 M (117.72 FT) WEST-SOUTHWEST OF THE TOMBSTONE OF JUNE ALLEN 1868 - 1923, AND 36.36 M (119.29 FT) WEST-SOUTHWEST OF THE TOMBSTONE OF ELLA CARTER STELLE 1876 - 1945. STATION 40-11 1990 MAY BE USED AS AN AZIMUTH FOR THIS STATION.
1/28/1992 by (GOOD)
RECOVERED 1992 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in December 1992.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • 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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