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Details for Benchmark: LZ0500

N 41° 46.717 W 076° 47.317 (NAD 83)

Altitude: 1139.68

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

Location:
In BRADFORD county, PA View Original Datasheet
Designation:
1139 H USGS
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Still here - became obsessed with finding this BM and did!! But boy is it overgrown -

[Photos:]
photoTroy Disk
Overgrown area
N 41° 46.722 W 076° 47.326

I was staying in Troy this weekend and decided to search for a few local benchmarks. This one seemed like a likely candidate. I started out very early in the morning and located the abandoned railroad bed with no trouble. But the only landmark mentioned was a stone foundation I couldn't find; I knew better than to depend much on the coordinates; and the vegetation in the area was so thick (and sharp!) I didn't think I had much of a chance of seeing or getting near the mark. I walked up the railroad bed for some time and, not finding anything of interest or even a likely starting point, turned around and headed back. It was then that through the thorns and branches I spotted what looked like a stone wall -- and not at all far from the location given by the coordinates! Well, I just had to check it out, so I fought my way through and, once out on the foundation, saw the disk immediately. It's in very good condition, and coordinates and altitude were good.

Zhanna

[Photos:]
photoLZ0500, Bradford County, PA
photoThe stone foundation and the disk...
photoOuch!!!
photoThe nearby Troy station...
...which now serves some other purpose(though I'm not sure what that is).
photoCool old railroad sign.
photoThe creek running parallel to the railroad bed, on a foggy morning.

Documented History (by the NGS)

1/1/1899 by USGS (MONUMENTED)
1/1/1933 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1933 0.2 MI S FROM TROY. 0.2 MILE SOUTH ALONG THE PENNSYLVANIA RAILROAD FROM THE STATION AT TROY, BRADFORD COUNTY, AT THE NORTH SIDE OF THE FOUNDATION OF A WATER TANK, AND IN THE TOP OF THE COPING STONE. A UNITED STATES GEOLOGICAL SURVEY STANDARD DISK, STAMPED 1139 H 1899.
1/1/1945 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1945 RECOVERED IN GOOD CONDITION.
1/1/1983 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN GOOD CONDITION, NEW DESCRIPTION FOLLOWS. IN TROY, 0.2 KM (0.15 MI) EAST ALONG WILLOW STREET FROM THE POST OFFICE, THENCE 0.2 KM (0.1 MI) SOUTH ALONG AN OLD RAILROAD BED TO THE MARK ON THE RIGHT, 5.79 METERS (19.0 FT) WEST OF THE CENTER OF THE RAILROAD BED, 19.51 METERS (64.0 FT) WEST OF THE CENTER OF A BLACKTOP STREET, 2.74 METERS (9.0 FT) WEST OF THE NORTHEAST CORNER OF AN OLD FOUNDATION.

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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