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Details for Benchmark: LC1683

N 40° 21.100 W 088° 46.300 (NAD 83)

Altitude: 788.73

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

Location:
In MCLEAN county, IL View Original Datasheet
Designation:
F 297
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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Found right by town of LeRoy. Cords I got were N40.21.094 W 088.46.303. Easy but muddy find.

[This entry was edited by wvhillbilly59 on Wednesday, March 07, 2007 at 5:13:29 PM.]

[Photos:]
photoF297
Muddy and icy, inside, but there.

Documented History (by the NGS)

01/01/1986 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1986 16.7 KM (10.4 MI) NW FROM FARMER CITY. 16.7 KM (10.35 MI) NORTHWESTERLY ALONG U.S. HIGHWAY 150 FROM ITS JUNCTION WITH STATE HIGHWAY 54 IN FARMER CITY, AT THE WEST EDGE OF THE CITY LIMITS OF LEROY, 0.2 KM (0.1 MI) WEST OF THE INTERSECTION OF HEMLOCK STREET, 16.8 M (55.1 FT) NORTH OF A UTILITY POLE, 9.1 M (29.9 FT) SOUTH OF THE CENTERLINE OF THE HIGHWAY, 6.3 M (20.7 FT) EAST OF A GUY WIRE ANCHOR, AND 0.8 M (2.6 FT) WEST OF A UTILITY POLE. NOTE--ACCESS TO DATUM POINT IS HAD THROUGH A 5-INCH LOGO CAP. THE MARK IS 0.3 METERS E FROM A WITNESS POST THE MARK IS 0.6 M ABOVE THE HIGHWAY.

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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