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Details for Benchmark: ME2796

N 41° 52.945 W 087° 38.367 (NAD 83)

Altitude: 919

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

Location:
In COOK county, IL View Original Datasheet
Designation:
NEWS
Marker Type:
triangulation station disk
Setting:
in rock outcrop
Stability:

Reference Points

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Documented History (by the NGS)

01/01/1956 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1956 (WNM) THE STATION IS LOCATED ON THE HIGHEST PART OF THE PENTHOUSE ROOF OF THE CHICAGO DAILY NEWS BUILDING, 400 WEST MADISON STREET, AT THE INTERSECTION OF MADISON AND CANAL STREETS IN CHICAGO. THE ROOF IS ABOUT 8 FEET WIDE BY 14 FEET LONG AND IS SURROUNDED BY A BRICK WALL ABOUT 2 FEET HIGH. THE WALL HAS A 4 INCH CONCRETE SLAB ON THE TOP. THE ROOF SURFACE IS OF CONCRETE SLAB CONSTRUCTION AND IS COVERED WITH SHEET ROOFING MATERIAL, TAR AND GRAVEL. THE STATION MARK DISK IS SET IN A DRILL HOLE IN THE CONCRETE SLAB, IS COUNTERSUNK, AND CEMENTED WITH ROOFING CEMENT. A 2-1/2 INCH IRON PIPE WITH SCREW CAP EXTENDS FROM THE DISK THROUGH THE ROOFING MATERIAL, TAR AND GRAVEL AND PROJECTS 2 INCHES ABOVE THE SURFACE. THE MARK IS 10.3 FEET SOUTHWEST OF THE NORTHEAST CORNER OF THE PENTHOUSE WALL, 7.6 FEET NORTHWEST OF THE SOUTHEAST CORNER AND 3.2 FEET WEST OF THE EAST WALL, AND IS STAMPED NEWS 1956. REFERENCE MARK 1 IS SET WITH ROOFING CEMENT IN A DRILL HOLE ON TOP OF THE SOUTHWEST CORNER OF THE PENTHOUSE WALL. THE DISK IS STAMPED NEWS NO 1 1956. REFERENCE MARK 2 IS SET WITH ROOFING CEMENT IN A DRILL HOLE ON TOP OF THE NORTHWEST CORNER OF THE PENTHOUSE WALL. THE DISK IS STAMPED NEWS NO 2 1956. HEIGHT OF LIGHT ABOVE STATION MARK 1 METER.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 (JLO) THE STATION MARK, AND REFERENCE MARKS 1 AND 2 WERE RECOVERED AND FOUND IN GOOD CONDITION. THE DISTANCE AND DIRECTION TO REFERENCE MARK 1 AND REFERENCE MARK 2 COMPARED FAVORABLY WITH THE OLD DATA. A NEW DESCRIPTION FOLLOWS. THE STATION IS LOCATED IN DOWNTOWN CHICAGO, ON THE ROOF OF THE OLD CHICAGO DAILY NEWS BUILDING, NOW KNOWN AS 2 NORTH RIVERSIDE-PLAZA CORPORATION. IT IS IN THE NORTHEAST ANGLE OF THE INTERSECTION OF MADISON STREET AND CANAL STREET. THE ADDRESS FOR THE STATION IS 400 WEST MADISON AVENUE. STATION MARK, STAMPED---NEWS 1956---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN THE ROOFING MATERIAL AND IS COVERED BY A COPPER LINCOLN HAT THAT PROJECTS 3 INCHES ABOVE THE ROOF. IT IS 10.3 FEET SOUTHWEST OF THE NORTHEAST CORNER OF THE PENTHOUSE WALL, 7.6 FEET NORTHWEST OF THE SOUTHEAST CORNER OF THE PENTHOUSE WALL AND 3.2 FEET WEST OF THE EAST PENTHOUSE WALL. REFERENCE MARK 1, STAMPED---NEWS NO 1 1956---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE ON TOP OF THE SOUTHWEST CORNER OF THE PENTHOUSE WALL. REFERENCE MARK 2, STAMPED---NEWS NO 2 1956---, IS A STANDARD DISK CEMENTED IN A DRILL HOLE ON TOP OF THE NORTHWEST CORNER OF THE PENTHOUSE WALL. STATION 016 COC CAN BE USED AS THE AZIMUTH MARK. SEE DESCRIPTION THEREOF. HEIGHT OF LIGHT ABOVE THE STATION MARK WAS 1.6 METERS.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 1999.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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