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Details for Benchmark: LY1235

N 41° 27.867 W 075° 07.600 (NAD 83)

Altitude: 834.11

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

Location:
In PIKE county, PA View Original Datasheet
Designation:
Z 235
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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This morning Rich and I revisited this mark, curious how it could've been damaged or removed as indicated in the previous log. We were pleased to find that [b]the mark is still intact[/b] on the northwest wingwall of the north abutment of the bridge over Decker Creek. There may have been a mixup with the opposite corner of the bridge (the southeast wingwall of the south abutment), where the concrete wingwall was indeed damaged.

Zhanna

[Photos:]
photoSoutheast wingwall, broken concrete.
photoLooking SE along Hendershot Rd. (T 495).
The bridge corner shown is not the one where the mark is located.
photoMark intact on NW wingwall.
photo Looking NE along Hendershot Rd. (T 495).
Zhanna stands near the mark.

We found the spot and compared it carefully to a picture that was taken by Zhanna in November 2003. It appears that the mark has been broken off along with a big chunk of concrete.

N 41° 27.871 W 075° 07.610

We traveled north along Decker Hollow Road (past the site of the elusive LY1233 - X 235) to Kimbles to continue our search for the 235 series marks. This mark required no searching. As described, it's set in the northwest wingwall of the north abutment of a concrete bridge along T495, less than 200 feet south-southeast of the intersection of Decker Hollow Road and T495. The mark is in good condition with legible stamping.

[I]A report on the condition of this mark has been submitted to NGS.[/I]

Zhanna

[Photos:]
photoLY1235, Pike County, PA
photoThe mark on the NW wingwall.
photoLooking SE along T495.
photoLooking NE from T495 ...
... to its intersection with Decker Hollow Road.
photoA closer look at that strange chimney.
N 41° 27.872 W 075° 07.609

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

This second order vertical control station is set in the top of the northwest wingwall for the north abutment of a bridge along Hendershot Road (T495) which spans Decker Creek. The historical description leads reliably to the station. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 51 feet from the scaled coordinates listed in the NGS datasheet. The mark is well exposed, in good condition, and the stamped designation is legible. ~Rich in NEPA~

[Photos:]
photoLY1235, "Z 235 1959," Pike County, PA.
photoGPSr and the station mark.
photoEyelevel view of station mark and setting.
photoOrientation view, facing southeast.
photoOrientation view, facing northwest, mark indicated

the biggest help was not only our GPS, but the fact that it is above the creek.

[last edit: 10/9/2003 8:44:53 PM PST]

[Photos:]
photoLY1235
Here it is! My co-ords weren't too far off....

Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 AT KIMBLES. 0.05 MILE SOUTHWEST ALONG A GRAVEL ROAD FROM THE STEEL BRIDGE OVER THE RAILROAD AT KIMBLES, ALSO 2.9 MILE NORTH ALONG GRAVEL ROAD T367 FROM THE JUNCTION OF U.S. HIGHWAY NO 6 AND T367. SET IN TOP OF THE NORTH WEST WINGWALL FOR THE NORTH ABUTMENT OF A 30 FOOT BRIDGE OVER DECKER CREEK, 180 FEET SOUTH OF A T GRAVEL ROAD, 15 FEET WEST OF THE CENTERLINE OF THE ROAD AND ABOUT LEVEL WITH 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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