Details for Benchmark: LC0729
N 40° 41.848 W 088° 44.712 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is ADJUSTED. (more info)
- In MCLEAN county, IL View Original Datasheet
- Marker Type:
- traverse station disk
- set into the top of a round concrete monument
- May hold, but of type commonly subject to surface motion.
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Documented History (by the NGS)
|01/01/1960 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1960 (CAA)
THE STATION IS LOCATED ABOUT 3-1/2 MILES NORTHEAST OF LEXINGTON, 3 MILES SOUTH-SOUTHWEST OF CHENOA, 1/2 MILE EAST OF U.S. HIGHWAY 66 AND ON THE ROAD RIGHT-OF-WAY.
TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 66 AND LEXINGTON ROAD AT THE WEST EDGE OF LEXINGTON, GO NORTHEAST ON U.S. HIGHWAY 66 FOR 3.35 MILES TO A CROSSROAD, CONTINUE NORTHEAST ON HIGHWAY 66 FOR 0.55 MILE TO A GRAIN ELEVATOR ON THE RIGHT, CONTINUE NORTHEAST ON HIGHWAY 66 FOR 0.6 MILE TO A CROSSROAD, TURN RIGHT AND GO EAST ON A GRAVELED ROAD FOR 0.25 MILE TO THE STATION ON THE RIGHT SIDE OF ROAD.
STATION MARK, A STANDARD TRAVERSE DISK SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH PROJECTS 1-INCH AND IS STAMPED BALLARD 1960. THE MARK IS 69 FEET SOUTHWEST OF A TELEPHONE POLE, 23 FEET SOUTH OF THE CENTER OF ROAD, 7.2 FEET EAST-NORTHEAST OF A WITNESS POST AND 4.5 FEET NORTH OF A FENCE.
REFERENCE MARK 1, A STANDARD REFERENCE DISK SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH PROJECTS 1-INCH AND IS STAMPED BALLARD NO 1 1960. THE MARK IS 52.5 FEET SOUTHWEST OF A WITNESS POST, 33 FEET WEST OF A TELEPHONE POLE, 19 FEET NORTH OF THE CENTER OF A ROAD AND 3 FEET SOUTH OF THE SOUTH EDGE OF A FIELD.
REFERENCE MARK 2, A STANDARD REFERENCE DISK SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH PROJECTS 2-INCHES AND IS STAMPED BALLARD NO 2 1960. THE MARK IS 34.5 FEET WEST OF A WITNESS POST, 24 FEET SOUTH OF THE CENTER OF A ROAD AND 3.5 FEET NORTH OF A FENCE.
AZIMUTH MARK, A STANDARD AZIMUTH DISK SET IN TOP OF A 12-INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND AND IS STAMPED BALLARD 1960. THE MARK IS 22 FEET NORTH OF THE CENTER OF A ROAD, 2.5 FEET WEST OF A TELEPHONE POLE AND 2 FEET WEST OF A WITNESS POST.
TO REACH THE AZIMUTH MARK FROM THE STATION, GO EAST ON GRAVELED ROAD FOR 0.3 MILE TO THE MARK ON THE LEFT SIDE OF ROAD.
THE DISTANCE BETWEEN R.M. NO. 1 AND R.M. NO. 2 IS 74.10 FEET OR 22.585 METERS.
|01/01/1961 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1961
3.5 MI SW FROM CHENOA. ABOUT 3.2 MILES SOUTHWEST ALONG U.S. HIGHWAY 66 FROM ITS JUNCTION WITH U.S. HIGHWAY 24 IN THE SOUTHWEST PART OF CHENOA, THENCE 0.3 MILE EAST ALONG A GRAVEL ROAD, ABOUT 0.10 MILE EAST OF A FARM HOUSE SOUTH OF THE ROAD, 23 FEET SOUTH OF THE CENTER LINE OF THE ROAD, 4.5 FEET NORTH OF A FENCE, 70 FEET SOUTHWEST OF THE THIRD TELEPHONE POLE EAST OF THE HOUSE, 7.2 FEET NORTHEAST OF A METAL WITNESS POST, 0.5 FOOT BELOW THE LEVEL OF THE ROAD, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.
- 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.