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Details for Benchmark: KU4057

N 40° 55.702 W 073° 55.592 (NAD 83)

Altitude: 423

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

Location:
In BERGEN county, NJ View Original Datasheet
Designation:
INDIAN HEAD 1921
Marker Type:
drill hole
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

Must Read!

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I spent a sunny (but cold) Saturday hiking along the Palisades from Greenbrook Sanctuary to the NY-NJ state line. I worked my way through 6 triangualtion stations and found almost everything I was looking for. I spent almost half of my time at [url=http://www.geocaching.com/mark/details.aspx?PID=ku4051]KU4051 "HIGH POINT"[/url] and managed to find 4 of 5 reference marks plus a witness mark, but alas, not the ststion mark. Still all-in-all a very productive day.

This station was about a mile past the entrance to Greenbrook Sanctuary, where I started. It consist of a drill hole in a rock outcrop but there is also a nearby USE station (not in the NGS database) that was built on a concrete platform that sticks way out over thin air. Only the drill hole and impression of the USE station survive, but the spot is quite impressive. USE stands for the United States Engineers - parent of the US Army Corps of Engineers.

There was no way I could verify the 21.9 meters (71' 10") given in the description for the distance between the two stations using a tape (look at the last picture and you'll see why). So I set a waypoint at the USE station and then walked to KU4057 and checked the distance with the Go To function of my GPS. It fluctuated betweem 66 and 73 feet, so I was satisfied I had the right drill hole. Besides there were no other candidate holes in the area.

[Photos:]
photoKU4057 INDIAN HEAD, The Palisades, NJ
View showing the rock ledge with KU4057 and the platform with the USE station.
photoKU4057 INDIAN HEAD, The Palisades, NJ
Rock ledge with drill hole.
photoKU4057 INDIAN HEAD, The Palisades, NJ
Close up of drill hole.
photoUSE Station near KU4057, The Palisades, NJ
The concrete floor of the observation platform.
photoUSE Station near KU4057, The Palisades, NJ
Closeup of the old USE station. Only the drill hole and impression of the disk remain.
photoKU4057 INDIAN HEAD, The Palisades, NJ
View from the observation platform back to the rock ledge where the station was set. You are literally standing over the cliff edge.

Found with Harry Dolphin and Andy Bear.

[Photos:]
photoKU4057 Benchmark with GPS
photoKU4057 Benchmark with GPS
photoKU4057 Benchmark with Andy Bear

Found it.® With Harry Dolphin and Borress.

[Photos:]
photoKU4057 - View to east towards Yonkers.

Park at Alpine Lookout from the Palisades Parkway. Hike south along the Long Path. GPS coordinates and distance from U.S.E. station match. Drill hole is 1/2" rather than 1/4".

[Photos:]
photoKU4057
photoKU4057
With view to north of U.S.E. Station

Documented History (by the NGS)

01/01/1921 by NY6820 (MONUMENTED)
DESCRIBED BY CITY OF YONKERS NEW YORK 1921 STATION IS A 1/4-INCH DRILL HOLE IN LEDGE OF ROCK AT TOP OF THE PALISADES, NEAR EDGE OF CLIFF ON PROPERTY OF MANUEL RIONDA, ABOUT OPPOSITE SUNSET PARK, YONKERS. IT IS 21.9 METERS SE OF A U.S.E STATION WHICH IS PARTLY ENCLOSED BY AN IRON FENCE THAT IS BUILT ALONG THE EDGE OF THE CLIFF.
01/01/1930 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1930 (CAE) STATION RECOVERED. NOT OCCUPIED OR USED IN THE 1930 WORK.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in September 1999.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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