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Details for Benchmark: KU1153

N 40° 53.283 W 073° 50.550 (NAD 83)

Altitude: 98.75

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

Location:
In BRONX county, NY View Original Datasheet
Designation:
Y 351
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found in good condition as described. Well, good as far as the mark disk, although covered with enough paint to mostly obscure the stampings. However, the level line seems to have been cleared, and the benchmark would be useful.

[Photos:]
photoY351 Disk
photoY351 Setting

covered with so amny coats of paint as to be illegible. But the mark is still there.

cool bench make.. never knew these existed till now

Found as described in good condition.

There is a fairly heavy layer of paint on the mark but you can make out the designation. Of the letters of "Y 351", the "Y" and the "1" stand out, the "5" is so-so and the "3" is a bit harder to make out.

[This entry was edited by Papa-Bear-NYC on Tuesday, April 18, 2006 at 4:31:09 PM.]

[Photos:]
photoKU1153 "Y351", Grenada & Edson, Bronx NY
View of the apartment building from across Granada Place with the mark outlined.
photoKU1153 "Y351", Grenada & Edson, Bronx NY
Of the letters of "Y 351", the "Y" and the "1" stand out, the "5" is so-so and the "3" is a bit harder to make out.

Found this BM while working in the area.

Documented History (by the NGS)

01/01/1952 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1952 AT NEW YORK. AT NEW YORK, IN BOROUGH OF BRONX, AT INTERSECTION OF GRENADA PLACE AND EDSON AVENUE, AT EDENWALD APARTMENT HOUSES (NOW UNDER CONSTRUCTION), 134 FEET SOUTH OF CENTER LINE OF GRENADA PLACE, ABOUT 12 FEET EAST OF THE EXTENDED WEST CURB LINE OF EDSON AVENUE, SET VERTICALLY IN THE NORTH FACE OF CONCRETE FOUNDTION OF APARTMENT BUILDING NO. 38-45 BAYCHESTER AVENUE, 0.8 FOOT EAST OF NORTHWEST CORNER OF NORTHWEST WING OF BUILDING AND ABOUT 2 1/2 FEET ABOVE GROUND.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (GFW) RECOVERED IN GOOD CONDITION.
09/13/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 RECOVERED IN GOOD CONDITION.

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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