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Details for Benchmark: LC1007

N 40° 27.033 W 089° 00.683 (NAD 83)

Altitude: 854.89

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

Location:
In MCLEAN county, IL View Original Datasheet
Designation:
E 164
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Got this one by luck. It's locked up in a fence because just a couple of feet above it the antenna it dangerous. But, I lucked onto a very nice guy who unlocked the gate for me and let me take a picture. Don't try to get inside the fence without permission and supervision. It's very dangerous.

[Photos:]
photoLC1007
This is at base of WJBC radio tower in Bloomington, IL.

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
01/01/1960 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1960 2 MI WSW FROM BLOOMINGTON. ABOUT 2.05 MILES WEST AND SOUTHWEST ALONG U.S. HIGHWAY 66 FROM ITS OVERPASS OVER THE ILLINOIS CENTRAL RAILROAD AT BLOOMINGTON, ABOUT 0.1 MILE EAST OF THE HIGHWAY, SET VERTICALLY IN THE EAST FACE OF CONCRETE BASE OF WJBC RADIO TOWER, AND ABOUT 2.3 FEET ABOVE GROUND.

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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