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Details for Benchmark: LZ0106

N 41° 25.483 W 076° 03.550 (NAD 83)

Altitude: 996.61

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

Location:
In WYOMING county, PA View Original Datasheet
Designation:
K 57
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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N 41° 25.478 W 076° 03.568

After we spent a few minutes examining the wrong pile of stones several hundred feet to the east, I spotted the abutment, still intact, through the trees. The disk was not located, although we did find an empty drillhole in the northeast end of the northwest bridge seat, as described. (The coordinates given above are for the drillhole on the abutment.) The station could not be positively identified, so at present its status must remain Not Found.

[i]A report on the status of this mark has been submitted to NGS, along with the following recovery note:[/i]

An empty drill hole was found at the location given in the description. The disk was not located.

Zhanna

[Photos:]
photoThe empty drill hole ...
photoEye-level view of the drill hole on the abutment.
photoView facing NW. My GPSr sits next to the drill hole.
N 41° 25.480 W 076° 03.565

[b]Mark not found.[/b]

This second order vertical control station is described as being set in the top of the northeast end of the northwest bridge seat. The historical description leads to the northwest abutment of what was once a railroad bridge over Bowman Creek in Noxen, but the railroad and the spans no longer exist. An empty drill hole was found at the described location for the station. There was no other evidence in sight which could be used to positively identify the station. At the suspected position a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 70.8 feet from the scaled coordinates listed on the NGS datasheet. ~Rich in NEPA~

[Photos:]
photoGPSr and an empty drill hole.
photoOverhead close-up of the drill hole.
photoEyelevel view of the described location.
photoOrientation view, facing northwest, drill hole indicated.
photoView facing remains of southeast abutment, drill hole indicated.

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 AT NOXEN. AT NOXEN, WYOMING COUNTY, ON THE LEHIGH VALLEY RAILROAD, ABOUT 700 FEET SOUTH OF THE STATION, ABOUT 150 FEET NORTH OF MILEPOST 199, 75 FEET SOUTH OF THE CENTER OF A MACADAM ROAD CROSSING, AT THE 120-FOOT 3-SPAN PLATE-GIRDER BRIDGE OVER BOWMANS CREEK, IN THE NORTHEAST END OF THE NORTHWEST BRIDGE SEAT, 6 FEET NORTHEAST OF THE CENTER LINE OF THE TRACK, AND ABOUT 6 FEET LOWER THAN THE TOP OF THE RAIL. A STANDARD DISK, STAMPED K 57 1934.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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