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Details for Benchmark: NG0129

N 42° 04.733 W 087° 43.283 (NAD 83)

Altitude: 633.73

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

Location:
In COOK county, IL View Original Datasheet
Designation:
05 NO 3301
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Found in excellent condition.

I really like Cook County Highway Department disks, mainly because they're so huge.

[Photos:]
photo05 NO 3301 (NG0129) Closeup
photo05 NO 3301 (NG0129) Looking S at the church
I'm surprised, honestly, that a lawnmower hasn't messed that disk up seriously.

Found at 5:15 p.m. This disk is as described and in excellent condition.
-Lancacher

N 42° 04.738 W 087° 43.326

Found in good condition. The description gave me the impression that the disk would be closer to the church than it is to the road. In fact the opposite is true, the disk is easily viewed from the sidewalk.

[Photos:]
photo05 No 3301. Wilmette, IL.
Close-up of the disk with GPSr.
photo05 No 3301. Wilmette, IL.
View of the church. The red arrow marks the approximate location of the disk.

Documented History (by the NGS)

Unknown by IL-031 (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 0.6 MI W FROM WILMETTE. 0.55 MILES WEST ALONG LAKE AVENUE FROM THE VILLAGE HALL ANNEX, AT THE INTERSECTION OF LAKE AVENUE AND RIDGE ROAD, SET IN THE NORTH LAWN OF ST. JOSEPH CHURCH, 82.2 FEET EAST OF THE EAST CURB OF RIDGE ROAD, 73.3 FEET NORTH OF THE CENTER LINE OF THE NORTHWEST MAIN ENTRANCE TO THE CHURCH 23.9 FEET SOUTH OF THE SOUTH CURB OF LAKE AVENUE. A COOK COUNTY HIGHWAY DEPARTMENT DISK IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND AND ABOUT LEVEL WITH THE STREET. SEC 33, T 42 N, R 13 E.

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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