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Details for Benchmark: LY1234

N 41° 27.150 W 075° 07.750 (NAD 83)

Altitude: 889.82

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
Y 235
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Exactly as described by Zhanna two and a half years ago. I am learning so much from her and from Rich.

N 41° 27.105 W 075° 07.812

Rich and I were in the area on this cloudy, cool Monday morning attempting a First Find on a new geocache. We had some time remaining after I located another nearby cache—one that Rich had already found—so we pulled out our pack of datasheets and noticed that this mark was very close by. It was a straightforward find because the proper boulder is the only one in the area even remotely the size described. We cleared the mark of an accumulation of soil and moss, and noted that the disk appeared to be in excellent condition. We could not, however, locate the pipe culvert mentioned in the description, so we took measurements from a nearby powerpole and culvert. The given to-reach directions were not checked.

[i]The following recovery note was submitted to NGS:[/i]

The station mark was recovered in good condition. The 2 foot pipe culvert could not be found. The station is approximately 62 feet SW of the NW end of a pipe culvert under the road and 90 feet NNE of PPL powerpole 31122/71789/N47871. Road T367 is now paved. To reach the station from the intersection of U.S. Route 6 and T367 (Decker Hollow Road), travel approximately 2.0 miles NE on T367 to the station on the left.

[Photos:]
photoLY1234, Pike County, PA
photoView of the boulder, facing east, showing Decker Hollow Road.
N 41° 27.093 W 075° 07.822

[b]Recovered in good condition.[/b]

This second order vertical control station is located on the top surface of a large boulder on the west side of Decker Hollow Road (T367) approximately 2.0 miles north from the intersection of PA Rt. 6. The historical description is no longer reliable. Station mark is 62 feet southwest of the northwest end of a pipe culvert under the roadway, 90 feet north-northeast of PPL powerpole 31122/71789/N47871, and 36 feet northwest of the centerline of the road. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record autonomous (non-corrected) coordinates which were 477 feet from the scaled coordinates listed on the NGS datasheet. The disk is now well exposed, in excellent condition, and the stamped designation is clearly legible. ~Rich in NEPA~

[Edit: corrected error in “to reach” distance.]

[last edit: 11/16/2003 1:11:26 PM PST]

[Photos:]
photoLY1234, “Y 235 1959,” Pike County, PA
photoGPSr and the station mark.
photoEyelevel view of station mark and surroundings.
photoOrientation view, facing east and Decker Hollow Road.
photoOrientation view, facing northeast, Zhanna at station mark.

Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 1 MI SW FROM KIMBLE. 1.05 MILE SOUTHWEST ALONG GRAVEL ROAD T367 FROM A STEEL BRIDGE OVER THE RAILROAD IN KIMBLES. SET IN TOP CENTER OF A 6 1/2 FOOT BY 5 1/2 FOOT BY 3 FOOT BOULDER, 25 FEET NORTH OF THE NORTHWEST END OF A 2 FOOT PIPE CULVERT UNDER THE ROAD, 35 FEET NORTHWEST OF AND 5 FEET ABOVE THE CENTERLINE OF THE ROAD.

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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