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Details for Benchmark: LC0752

N 40° 48.454 W 088° 41.237 (NAD 83)

Altitude: 669.53

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

Location:
In LIVINGSTON county, IL View Original Datasheet
Designation:
OCOYA
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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Found in good condition.

[Photos:]
photoLC0752

Still here and under a bunch of mud.

[Photos:]
photoLC0752 (Ocoya)

Found today.

[Photos:]
photoLC0752
Near Pontiac, IL

Super easy! Witness posts mark these well.

[Photos:]
photoLC0752
LC0752 in Ocoya Township near Pontiac, IL

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (CAA) STATION IS LOCATED ABOUT 6.0 MILES SOUTHWEST OF PONTIAC, ABOUT 1/4 MILE WEST-NORTHWEST OF OCOYA AND ABOUT 1/4 MILE WEST OF U.S. HIGHWAY 66. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 66 AND U.S. HIGHWAY 24 IN THE WEST EDGE OF CHENOA, GO NORTHEAST ON U.S. HIGHWAY 66 FOR 5.4 MILES TO GRAIN ELEVATOR ON RIGHT AT OCOYA, CONTINUE NORTHEASTERLY ON U.S. HIGHWAY 66 FOR 0.15 MILE TO TO CROSSROAD, TURN LEFT GO WEST ON GRAVELED ROAD FOR 0.25 MILE TO STATION ON RIGHT AS DESCRIBED. STATION MARK IS A STANDARD TRAVERSE DISK SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET ABOUT 2 INCHES BELOW THE SURFACE OF THE GROUND AND THE DISK IS STAMPED OCOYA 1960. THE MARK IS 23 FEET NORTH OF THE CENTER OF ROAD, 11 FEET EAST OF CENTER OF FIELD ENTRANCE, 4.8 FEET SOUTH OF FENCE CORNER AND 3.2 FEET SOUTH OF THE WITNESS POST. REFERENCE MARK 1, A STANDARD REFERENCE DISK SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND AND THE DISK IS STAMPED OCOYA NO 1 1960. THE MARK IS 48.2 FEET EAST OF THE WITNESS POST, 21 FEET NORTH OF THE CENTER OF ROAD, 15 FEET WEST-NORTHWEST OF A CONCRETE CULVERT HEADWALL AND 1 FOOT SOUTH OF FENCE. REFERENCE MARK 2 IS A STANDARD REFERENCE DISK SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND AND THE DISK IS STAMPED OCOYA NO 2 1960. THE MARK IS 50 FEET SOUTH OF THE WITNESS POST, 23 FEET SOUTH OF THE CENTER OF ROAD AND 1 FOOT NORTH OF THE FENCE. AZIMUTH MARK IS A STANDARD AZIMUTH DISK SET IN THE TOP OF A 12 INCH SQUARE CONCRETE POST WHICH IS SET FLUSH WITH THE SURFACE OF THE GROUND. THE MARK IS 26 FEET SOUTH OF THE CENTER OF ROAD, 11 FEET EAST OF CENTER OF DRIVEWAY LEADING TO RICHARD CRADOCKS FARM HOME, 1.8 FEET EAST OF THE WITNESS POST AND 1 FOOT NORTH OF THE FENCE. TO REACH THE AZIMUTH MARK FROM THE STATION, GO WEST 0.4 MILE TO THE AZIMUTH MARK ON SOUTH SIDE OF ROAD AS DESCRIBED. HEIGHT OF LIGHT ABOVE STATION MARK 2 METERS.
01/01/1961 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1961 5.5 MI NE FROM CHENOA. ABOUT 5.3 MILES NORTHEAST ALONG U.S. HIGHWAY 66 FROM ITS JUNCTION WITH U.S. HIGHWAY 24 IN THE SOUTHWEST PART OF CHENOA, THENCE 0.2 MILES WEST ALONG A GRAVEL ROAD AT A FENCE CORNER AND A FIELD ENTRANCE NORTH OF THE ROAD, 24 FEET NORTH OF THE CENTER LINE OF THE ROAD, 11 FEET EAST OF THE CENTER LINE OF THE FIELD ENTRANCE, 5 FEET SOUTH OF THE FENCE CORNER, 61 FEET WEST OF THE WEST END OF THE NORTH HEADWALL OF A CONCRETE PIPE CULVERT, 3.2 FEET SOUTH OF A METAL WITNESS POST, ABOUT LEVEL WITH THE ROAD, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 (CLN) THE STATION MARK, REFERENCE MARKS 1, 2 AND THE AZIMUTH MARK WAS RECOVERED IN GOOD CONDITION. THE DISTANCE AND DIRECTION TO THE REFERENCE MARKS CHECKED FAVORABLY. THE PREVIOUS DESCRIPTION AND TOO REACH ARE ADEQUATE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--ABOUT 6 MILES SOUTHWEST OF PONTIAC.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
09/04/1990 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990 STATION MARK RECOVERED IN GOOD CONDITION. OTHER MARKS NOT SEARCHED FOR. STATION IS ALSO A BENCH MARK. STATION IS LOCATED ABOUT 9 KM (5.6 MI) SOUTHWEST OF PONTIAC, 0.5 KM (0.3 MI) NORTHWEST OF OCOYA, IN A WEED STRIP BETWEEN A GRAVEL ROAD AND A CULTIVATED FIELD, AT A LONE STEEL FENCE POST WITH BRACE POINTING INTO FIELD, IN EAST CENTRAL SECTION 8, T 27 N, R 5 E. OWNERSHIP--DEPARTMENT OF TRANSPORTATION. TO REACH FROM THE JUNCTION OF INTERSTATE HIGHWAY 55 AND STATE HIGHWAY 116 (EXIT 197) AT PONTIAC, GO EAST ON HIGHWAY 116 FOR 2.35 KM (1.46 MI) TO A CROSS HIGHWAY (OLD HIGHWAY 66). TURN RIGHT, SOUTH, FOR 2.78 KM (1.73 MI) TO THE STATE POLICE BARRACKS ON THE RIGHT. CONTINUE SOUTHWEST ON HIGHWAY FOR 5.47 KM (3.40 MI) TO A CROSSROAD (PAVED EAST, GRAVEL WEST). TURN RIGHT, WESTERLY, ON ROAD 1250 N FOR 0.39 KM (0.24 MI) TO THE STATION ON THE RIGHT. STATION MARK IS SET IN THE TOP OF A 30-CM SQUARE CONCRETE POST 5 CM BELOW GROUND. IT IS 7.5 M (24.6 FT) NORTH OF, AND 0.3 M (1.0 FT) LOWER THAN THE ROAD CENTER, 1.5 M (4.9 FT) SOUTH OF THE LONE FENCE POST, 0.4 M (1.3 FT) EAST OF A FIBERGLASS WITNESS POST, 0.4 M (1.3 FT) NORTH OF A METAL WITNESS POST, 18.5 M (60.7 FT) WEST OF THE WEST END OF A SMALL CONCRETE CULVERT HEADWALL, AND 22.1 M (72.5 FT) NORTHWEST OF WEST END OF A SMALL CONCRETE CULVERT HEADWALL ACROSS THE ROAD.
05/06/1997 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1997 (AJL) THE STATION IS LOCATED ABOUT 48 KM (29.80 MI) NORTHEAST OF BLOOMINGTON, 9 KM (5.60 MI) SOUTH-SOUTHWEST OF PONTIAC, 1 KM (0.60 MI) EAST-SOUTHEAST OF INTERSTATE HIGHWAY 55, IN A STRIP OF WEEDS BETWEEN A CULTIVATED FIELD AND A GRAVEL ROAD. OWNERSHIP--ILLINOIS DEPARTMENT OF TRANSPORTATION. TO REACH FROM THE OVERPASS AT THE JUNCTION OF INTERSTATE HIGHWAY 55 AND STATE HIGHWAY 116 (EXIT 197) ON THE WEST SIDE OF PONTIAC, GO EAST ON HIGHWAY 116 FOR 2.35 KM (1.45 MI) TO A CROSS HIGHWAY, OLD STATE HIGHWAY 66. TURN RIGHT, SOUTH, ON THE HIGHWAY FOR 2.78 KM (1.70 MI) TO THE STATE POLICE HEADQUARTERS ON THE RIGHT. CONTINUE AHEAD, SOUTH, ON THE HIGHWAY FOR 5.47 KM (3.40 MI) TO A CROSSROAD (PAVED LEFT AND GRAVEL RIGHT) JUST BEFORE A LARGE GRAIN ELEVATOR ON THE LEFT. TURN RIGHT, WEST, ON THE DEAD END GRAVEL ROAD (ROAD 1250) FOR 0.38 KM (0.25 MI) TO THE STATION ON THE RIGHT. THE STATION IS SET IN A 30 CM SQUARE CONCRETE POST RECESSED 5 CM BELOW THE GROUND. IT IS 18.8 M (61.7 FT) WEST OF THE NORTH END OF A STEEL CULVERT UNDER THE GRAVEL ROAD, 7.8 M (25.6 FT) NORTH OF AND 0.3 M (1.0 FT) LOWER THAN THE ROAD CENTER, 7.9 M (25.9 FT) WEST OF THE EAST END OF A STEEL CULVERT UNDER A FIELD ROAD, 3.8 M (12.5 FT) WEST OF THE CENTER OF A FIELD ENTRANCE ROAD, 0.3 M (1.0 FT) EAST OF A FIBERGLASS WITNESS POST, 0.3 M (1.0 FT) NORTH OF A STEEL WITNESS POST, AND 0.2 M (0.7 FT) SOUTH OF A 0.5 M (1.6 FT) SQUARE CONCRETE BLOCK PROJECTING 30 CM.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1998.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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