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Details for Benchmark: LY2642

N 41° 20.394 W 074° 46.039 (NAD 83)

Altitude: 482

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
CS PEIRCE AZ MK
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Following our recovery of the CS PEIRCE triangulation station ([URL=http://www.geocaching.com/mark/details.aspx?PID=ly2641]LY2641[/URL]) and reference mark #1, and an unsuccessful search for reference mark #2, Rich and I headed across the highway to look for the azimuth mark. We found the correct powerpole, but no mark was found near its base. We concluded that if the mark is still in place, it has been paved over and is therefore not easily accessible.

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

The correct powerline pole was located, but the mark could not be found. It may have been paved over. No witness post exists at this location.

Zhanna

[Photos:]
photoLooking NE toward powerpole 71 and Routes 6 & 209.
The suspected location of the mark.

[B]Mark not found.[/B]

This azimuth mark for triangulation station CS PEIRCE was searched for and not found. The historical description leads to the appropriate powerpole, the directions and distances from the station to the azimuth mark seem to fit, but the entire area around the suspected location appears to have been paved over since the time the mark was monumented. It's possible the mark is still there but under a layer of asphalt. The witness post was not found either. For further information and photos of the site see [B]LY2641[/B] (http://www.geocaching.com/mark/details.asp?PID=LY2641). ~Rich in NEPA~

Documented History (by the NGS)

1/1/1979 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1979 (RGP) THE STATION IS LOCATED ABOUT 6 MILES SW OF PORT JERVIS, 2-1/4 MILES NE OF MILFORD AND ON ROAD RIGHT-OF-WAY. TO REACH FROM THE POST OFFICE IN MILFORD, GO E ON WEST HARFORD STREET FOR 0.15 MILE TO THE INTERSECTION OF HIGHWAYS 6, 206 AND 209. TURN LEFT AND GO NE ON HIGHWAYS 6 AND 209 FOR 2.3 MILES TO THE STATION ON THE RIGHT. THE STATION MARK IS A STANDARD AZIMUTH MARK DISK STAMPED C S PEIRCE 1979, SET IN THE TOP OF A 10-INCH ROUND CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE. IT IS 29 FEET SE OF THE CENTER OF HIGHWAYS 6 AND 209, 4.0 FEET SW OF A POWERLINE POLE NUMBERED 71 AND 1.8 FEET SW OF A WITNESS POST. FOR ADDITIONAL INFORMATION SEE THE DESCRIPTION FOR STATION C S PEIRCE.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in September 1999. No horizontal observational check was made to the station.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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