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Details for Benchmark: KV1496

N 40° 35.000 W 075° 28.467 (NAD 83)

Altitude: 373.4

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

Location:
In LEHIGH county, PA View Original Datasheet
Designation:
GREAT POINT C OF A
Marker Type:
triangulation station disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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The east west street that the mark is in the center of the "prolongation" of would be W Juniata, but it has been extended and turned. If the mark exists it would be in the back yard of one of the houses along the street. Chances are it was dug up during construction.

I could not find this marker based on the description. I beleive it is gone or covered over. The US Power Squadron reported that they recovered it on 01/28/02, but I think that they were documenting a false location. There is a smaller (8 inch) terra cotta pipe in the area where the benchmark should be, but this pipe houses a residential water valve, not a benchmark. I can't say for sure that benchmark is still there or not, I would need a metal detector to find it.

[last edit: 4/21/2003 12:01:17 PM PST]

Documented History (by the NGS)

01/01/1932 by PA0110 (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1932 AT ALLENTOWN. AT ALLENTOWN, LEHIGH COUNTY, AT GREAT POINT PARK, 0.3 MILE NORTHWEST OF THE MACK TRUCK CO. PLANT, 400 YARDS EAST OF LEHIGH STREET, 80 YARDS SOUTHWEST OF A LARGE BRICK DWELLING, ON THE PROLONGATION OF THE CENTERLINE OF AN EAST-AND-WEST STREET FROM LEHIGH STREET, AND ABOUT 18 INCHES UNDER GROUND. A BRONZE DISK SET IN CONCRETE IN THE TOP OF A 10-INCH TERRA-COTTA PIPE.
01/01/1932 by CGS (GOOD)

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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