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Details for Benchmark: LY2401

N 41° 57.767 W 075° 34.983 (NAD 83)

Altitude: 926.57

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

Location:
In SUSQUEHANNA county, PA View Original Datasheet
Designation:
E 400
Marker Type:
bench mark disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

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This was very easy to see, even from the car. Mom got out and took a picture.

We were in the area logging a geocache and couldn't pass up the opportunity to see the benchmark disk set in the support pier of the viaduct. The benchmark is in good condition, although there is now spray painted graffitti above it (but not on the disk itself).

[Photos:]
photoThe disk.
photoBenchmark set in viaduct pier.
N 41° 57.786 W 075° 34.999

This was an easy find on a very cold and windy Sunday! I parked quite a distance down the road and walked along ice-covered sidewalks to the viaduct. The benchmark is easy to spot and is in good condition. This is a special one for me because my grandmother was born in Lanesboro and lived there until 1930. I remember going to Lanesboro see her old house when I was very young, and the viaduct made an impression on me even then.

Zhanna

[Photos:]
photoLY2401, Susquehanna County, PA
photoYou can even see it from the car...
... if you know where to look.
photoThe viaduct...

Documented History (by the NGS)

1/1/1982 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1982 IN LANESBORO. IN LANESBORO, SET VERTICALLY IN THE NORTH FACE OF THE MOST SOUTHERLY PIER OF A MASSIVE RAILROAD TRESTLE (STARRUCCA VIADUCT) OVER VIADUCT ROAD AND STARRUCCA CREEK, 7.20 METERS (23.6 FT) SOUTH OF THE CENTER OF VIADUCT ROAD. THE MARK IS 1.20 M ABOVE 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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