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Details for Benchmark: KU1627

N 40° 56.850 W 073° 55.250 (NAD 83)

Altitude: 329.43

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

Location:
In BERGEN county, NJ View Original Datasheet
Designation:
D 40
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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This is the first benchmark I've found and recorded. I found it a few weeks ago but only looked into how to log benchmarks mow. Found it accidentally while out geocaching.

[Photos:]
photoBenchmark
photoBenchmark

Found as described.

[Photos:]
photoKU1627 "D 40" Apline, NJ
The former Yonkers Ferry Road is now the road from the park headquarters down to the Alpine boat basin. This is looking down the hill with the mark on the rock and the small culvert (from the description) further down.
photoKU1627 "D 40" Apline, NJ
Rock face with mark.
photoKU1627 "D 40" Apline, NJ
Closeup

Found it.® I coud see it from the car.

N 40° 56.879 W 073° 55.266

Very easy find by description. I got dropped off, found it within a minute, and had to walk down to the traffic circle. Oh, well.

[Photos:]
photoKU1627 Alpine Bergen NJ Close Up
photoKU1627 Alpine Bergen NJ View west
photoKU1627 with GPS and coordinates

Documented History (by the NGS)

01/01/1956 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1956 1.5 MI NE FROM ALPINE. 0.2 MILE EAST ALONG CLOSTER DOCK ROAD FROM THE ALPINE METHODIST CHURCH, 0.7 MILE NORTH ALONG U.S. HIGHWAY 9W, THENCE 0.6 MILE SOUTHEAST ALONG YONKERS FERRY ROAD, SET VERTICALLY IN THE EAST FACE OF A LARGE BOULDER, 95 FEET NORTH OF A SMALL CONCRETE CULVERT, 17 FEET WEST OF THE CENTERLINE OF ROAD, 1.7 FEET ABOVE THE GROUND.

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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