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Details for Benchmark: KV0598

N 40° 43.767 W 074° 00.400 (NAD 83)

Altitude: 19.8

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

Location:
In NEW YORK county, NY View Original Datasheet
Designation:
C 403
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found in good condition as described. Most of the stampings are legible through the paint, and the black marker is a nice touch.

[Photos:]
photoC403 Disk
photoC403 Setting

Found it.
I take some paint out from the benchmark.

[Photos:]
photoKV0598
photoKV0598

Seen it during my stay in New York City.

TFTB

[Photos:]
photoKV0598.

Found it during my trip in New York.

Found with a lot of paint on it.

[Photos:]
photoC 403
photoSetting
N 40° 43.775 W 074° 00.420

Painted over several times, can't read disk inscriptions but someone has marked an outline of the disk in chalk or something similar.

Read GPS coordinates of 40 43.775N, 74 00.420W from handheld mobile phone: LG Nexus 5. Altitude reading of 85 ft.

[Photos:]
photoMarked disk

Came along during a tour through Lower Manhattan.

Still there, still painted over and difficult to spot unless one is right up on it. I feel like returning with some paint remover. Only kidding. Not really.

Another mark found on the way to the Event. A game of baseball was being played nearby.

[Photos:]
photoKV0598 close up

Found it easily enough but it is painted over. If I lived in NYC I'd come over with some paint thinner and 'fix this one up'!

Found this one during my walk through New York City.

Found during one of our recent trips to Manhattan.

took my "long walk home" (14 to wtc) down Hudson tonight and hit a bunch of these. Can't believe i missed them before. I walked by yesterday totally oblivious to their presence.

Recovered as described by other posters, painted over.

[Photos:]
photoKV0598 "C 403" setting, Hudson & Clarkson, NYC
View of wall with ball field behind. The painted over mark is about 18" to the right of the scar in the wall and about 4 feet off the ground, just before a long vertical streak in the concrete.
photoKV0598 "C 403", Hudson & Clarkson, NYC
Painted over mark.
N 40° 43.774 W 074° 00.399

We found this mark as described, set in the south face of a gray-painted, curved concrete wall partially surrounding the southeast corner (Hudson & Clarkson Streets) of the James J. Walker ballfield. The benchmark was hard to spot beneath the thick layer of gray paint. The paint also makes the stamping difficult to distinguish, but with some effort it can still be read.

[i]A report on the condition of this mark has been submitted to NGS, along with the following recovery note:[/i]

Recovered in good condition. Concrete wall and disk have been painted over but designation is still legible. Autonomous (non-corrected) handheld GPS coordinates for the station are 40 43 46.43(N) 074 00 23.96(W).

Zhanna and Aaron

[Photos:]
photoKV0598, New York County, NY
photoThe mark is very difficult to spot ...
... even from just a few feet away.
photoThis high concrete wall ...
... surrounds the southeast corner of the ballfield.

Found this as described, in good condition.

Note, however, that the city painted the disc the same color as the concrete wall. It is easy to miss this one! I walked past it twice before I found it.

[last edit: 9/26/2003 11:30:08 AM PST]

Documented History (by the NGS)

1/1/1974 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1974 AT NEW YORK. AT NEW YORK, IN THE BOROUGH OF MANHATTEN, AT THE INTERSECTION OF HUDSON AND CLARKSON STREETS, SET VERTICALLY IN THE SOUTH FACE OF CONCRETE WALL AT THE SOUTH EDGE OF THE PLAY AREA, 30.3 FEET EAST OF THE EAST CURB OF HUDSON STREET, 14.1 FEET NORTH OF THE NORTH CURB OF CLARKSON STREET AND 3.3 FEET ABOVE THE SIDEWALK.

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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