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Details for Benchmark: LX1129

N 41° 26.500 W 073° 58.600 (NAD 83)

Altitude: 10.33

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

Location:
In PUTNAM county, NY View Original Datasheet
Designation:
U 42
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Today was another hot and humid day in the Greater NY area, but it was better than last week. I worked my way south along the Hudson River from Breakneck Ridge to Cold Spring. I hit about 50%: found 4, DNF 3. They are mostly near the RR, and keeping safe kept me away from a few other possible finds, but I count it as a good day.

I found this one after finding [url=http://www.geocaching.com/mark/details.aspx?PID=LX1131]LX1131 V42[/url]. That mark was on the north side of the tunnel and this one was on the south side. But I got to this mark without the suicidal idea of walking through an active RR tunnel by skirting around on the old road (now a rough path) which circles the point along the shoreline. When you come back to the tracks, you are right at this mark.

As usual, the scaled coordinates are pretty bad (but at least they're on this side of the tunnel).

Here's my own Google map showing the mark (with corrected coordinates). You can even see the faint sign of the old road which skirts around the point: [url=http://members.bellatlantic.net/~vze2h6gy/papabear/BM_Station_GMap.html#z=18&t=hyb&width=960&height=800&title=1&object={station:%22LX1129%22,lat:41.441693,lng:-73.97736,designation:%22U%2042%22,status:%22Found%22,date:%226/14/2008%22,scaled:1,scaled:2,type:%22Bench%20mark%20disk%22,agency:%22CGS%22,condition:%22Good%22}]LX1129 GMap[/url].

[This entry was edited by Papa-Bear-NYC on Saturday, June 14, 2008 at 6:13:44 PM.]

[Photos:]
photoLX1129 "U 42", Putnam County, NY
View of the south entrance to the RR tunnel. The mark is near the far southwest corner.
photoLX1129 "U 42", Putnam County, NY
View of tunnel wall with mark.
photoLX1129 "U 42", Dutchess County, NY
Closeup of disk

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1955 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1955 1.8 MI N FROM COLD SPRINGS. 1.85 MILES NORTH ALONG THE NEW YORK CENTRAL RAILROAD FROM THE STATION AT COLD SPRINGS, ABOUT 0.45 MILE NORTH OF MILE POST NY 54, SET VERTICALLY IN SOUTH FACE OF CONCRETE WALL ON WEST SIDE OF SOUTH ENTRANCE TO A RAILROAD TUNNEL, 25 1/2 FEET WEST OF WEST RAIL OF WEST TRACK, 1 FOOT EAST OF WEST END OF CONCRETE WALL, ABOUT 5 FEET ABOVE GROUND AND ABOUT 2 1/2 FEET ABOVE LEVEL OF TRACK.

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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