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Details for Benchmark: NB0852

N 42° 53.600 W 077° 24.250 (NAD 83)

Altitude: 868.73

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

Location:
In ONTARIO county, NY View Original Datasheet
Designation:
W 160
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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This was a PITA. The benchmark is landlocked by private property, surrounded by small trees and brush having inch long needle sharp thorns, and on the wrong side of a small creek with no place to cross. As I type this, I'm drying out and have stopped bleeding. If one approaches the mark precisely from the south, there is a small path that allows easier access. It may be easier to follow the nearby power line right-of-way, but I did it on the edge of various fields. No posted signs were visible. Unlike many others around here, the rail bed has not been turned into a hiking trail, and though the rails have been removed, the ties remain. The entire rail bed is impassible due to overgrowth. Handheld coordinates are 42.89334N 77.40412W

[Photos:]
photoCloseup of disk
photoThe view from the rail bed- disk hidden on right

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1942 0.9 MI E FROM HOLCOMB. TO REACH FROM THE RAILROAD STATION AT HOLCOMB, PROCEED 0.9 MILE EAST ALONG THE NEW YORK CENTRAL RAILROAD, TO A 6X6 FOOT CONCRETE AND STONE CULVERT UNDER RAILROAD AND SITE OF BENCH MARK. BENCH MARK IS SET HORIZONTALLY IN THE EAST END OF THE NORTH HEADWALL. IT IS 180.0 YARDS WEST OF MILE POST NO. 7, 8.6 FEET NORTH OF AND 0.6 FOOT BELOW THE CENTERLINE OF TRACKS, 1.4 FOOT WEST OF THE EAST END OF CULVERT. A DISK SET IN DRILL HOLE
01/01/1942 by NGS (GOOD)

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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