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Details for Benchmark: LC0733

N 40° 43.212 W 088° 44.180 (NAD 83)

Altitude: 747.32

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

Location:
In MCLEAN county, IL View Original Datasheet
Designation:
FLAP
Marker Type:
traverse station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Still there where cords say it will be.

[Photos:]
photoLC0733 (FLAP)

Found it in good condition. Cords were right on.

[Photos:]
photoLC0733(FLAP) near Chenoa, Illinois

Documented History (by the NGS)

01/01/1960 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1960 (CAA) STATION IS LOCATED ABOUT 4-1/2 MILES NORTH-NORTHEAST OF LEXINGTON, ABOUT 2.0 MILES SOUTH-SOUTHWEST OF CHENOA AND ON THE EAST SIDE OF U.S. HIGHWAY 66 BETWEEN THE HIGHWAY AND THE RAILROAD TRACKS. TO REACH FROM THE JUNCTION OF U.S. HIGHWAY 66 AND STATE ROUTE 24 IN THE WEST EDGE CHENOA, GO SOUTH-SOUTHWEST 1.6 MILES TO CROSSOVER, TURN LEFT (EAST) CROSSING U.S. HIGHWAY 66 AND THEN GO NORTH-NORTHEAST ON RIGHT-OF-WAY FOR 0.05 MILE TO STATION AS DESCRIBED. STATION MARK IS A STANDARD TRAVERSE DISK STAMPED FLAP 1960, IS SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND. THE MARK IS 72 FEET SOUTHEAST OF THE CENTER OF U.S. HIGHWAY 66, 44.5 FEET SOUTHEAST OF A DRAIN OUTLET, 44 FEET NORTHWEST OF THE WEST RAIL OF RAILROAD TRACKS AND 28.6 FEET SOUTH WEST OF A TRIANGLE BLAZED TELEGRAPH POLE. REFERENCE MARK 1 IS A STANDARD REFERENCE DISK STAMPED FLAP NO 1 1960, IS SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND. THE MARK IS SET 71 FEET SOUTHEAST OF THE CENTER OF U.S. HIGHWAY 66, 44.5 FEET NORTHWEST OF WEST RAIL OF RAILROAD TRACKS AND 6.2 FEET NORTH OF A TRIANGLE BLAZED TELEGRAPH POLE. REFERENCE MARK 2 IS A STANDARD REFERENCE DISK STAMPED FLAP NO 2 1960, IS SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND. THE MARK IS 72 FEET SOUTHEAST OF THE CENTER OF U.S. HIGHWAY 66, 68.5 FEET SOUTHWEST OF A TRIANGLE BLAZED TELEGRAPH POLE AND 44 FEET NORTHWEST OF THE WEST RAIL OF RAILROAD TRACKS. NO AZIMUTH MARK SET AT THIS STATION. CHENOA, ST. JOSEPH CATHOLIC CHURCH SPIRE MAYBE USED AS A AZIMUTH. HEIGHT OF LIGHT ABOVE STATION MARK 3 METERS.
01/01/1961 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1961 1.5 MI SW FROM CHENOA. 1.5 MILES SOUTHWEST ALONG U.S. HIGHWAY 66 FROM JUNCTION OF U.S. HIGHWAY 66 AND U.S. HIGHWAY 24 IN THE SOUTHWEST PART OF CHENOA, AT JUNCTION OF DRIVE EAST TO A FARM HOUSE, 72 FEET SOUTHEAST OF THE CENTER LINE OF THE NORTH BOUND LANE OF U.S. HIGHWAY 66, 43 FEET NORTHWEST OF THE NORTHWEST RAIL OF THE SOUTH BOUND TRACK OF THE GULF MOBILE AND OHIO RAIL ROAD, 256 FEET NORTHEAST OF THE CENTER LINE OF THE DRIVE, 29 FEET SOUTHWEST OF THE THIRD TELEGRAPH POLE NORTHEAST OF DRIVE, 1 FOOT ABOVE THE LEVEL OF THE HIGHWAY, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 1999.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • 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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