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Details for Benchmark: LY1150

N 41° 22.350 W 075° 04.717 (NAD 83)

Altitude: 1411

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
H 237
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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[B]Station mark removed.[/B]

NGS has directed that the mark be removed in order to eliminate confusion and errors. Zhanna and I returned to the site on this date to extricate the disk from the remaining piece of the boulder. ~Rich in NEPA~

[Photos:]
photoProcess of carefully removing the station mark.
photoOverhead close-up, mark detached from stem.
photoRich, the Destroyer of Benchmarks ... NOT!
Even though it was necessary, I felt bad about doing it.
photoZhanna displays the unfortunate casualty.
It was an exciting day, but a sad one nonetheless.
N 41° 22.363 W 075° 04.736

[B]Station is destroyed.[/B]

This second order vertical control station was set in the top of large boulder along the west-bound shoulder of Blooming Grove Road, roughly 2.6 miles east of the intersection with Rt. 402, and roughly 1 mile west-northwest of the intersection with Rt. 739 at Lords Valley. The historical description leads reliably to the station. However, the boulder has been destroyed (speculation is it was hit by a snowplow or bulldozer), and the chunk of rock with the mark still in it was simply placed atop the pile of rubble as if nothing happened! At the point where the station was found, a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 117.3 feet from the scaled coordinates listed in the NGS datasheet. ~Rich in NEPA~

[I]Note:[/I] Zhanna has submitted an official recovery report to NGS.

[Photos:]
photoLY1150, "H 237 1959," Pike County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing north, Blooming Grove Rd.
photoOrientation view, Zhanna at station.
photoOrientation view, Zhanna at station.

Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 11 MI SE FROM HAWLEY. 8.5 MILE SOUTHEAST OF HAWLEY TO THE GOOD SHEPHERD CHURCH THENCE 2.55 MILE EAST ALONG A BLACKTOP ROAD, SET IN TOP AND 1 FOOT NORTHWEST OF THE SOUTHEAST CORNER OF A 10 FOOT BY 12 FOOT BY 3 FOOT BOULDER WHICH IS ON THE RIGHTAWAY OF THE BLACKTOP ROAD, 12 FEET NORTH OF THE CENTERLINE OF THE ROAD. ALSO 0.35 MILE WEST OF THE GEORGE BLAIN MAIL BOX AND HOME.

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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