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Details for Benchmark: LC0757

N 40° 49.850 W 088° 40.533 (NAD 83)

Altitude: 663.95

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

Location:
In LIVINGSTON county, IL View Original Datasheet
Designation:
REED RM 1
Marker Type:
reference mark disk
Setting:
set into the top of a round concrete monument
Stability:
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)
01/01/1961 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1961 3.8 MI SW FROM PONTIAC. ABOUT 3.3 MILES SOUTHWEST ALONG U.S. HIGHWAY 66 FROM ITS JUNCTION WITH STATE HIGHWAY 116 IN THE SOUTHWEST PART OF PONTIAC, THENCE 0.4 MILES WEST ALONG A GRAVEL ROAD, THENCE 0.1 MILES NORTH ALONG A GRAVEL ROAD, AT A FARM HOUSE ON THE WEST SIDE OF THE ROAD, 18 FEET EAST OF THE CENTER LINE OF THE ROAD, 0.5 FEET WEST OF THE FENCE, 152 FEET SOUTH OF THE EXTENDED CENTER LINE OF THE FARM DRIVE WEST, 45 FEET EAST OF A POWER POLE WITH A TRANSFORMER, 443 FEET EAST OF TRAVERSE STATION REED, 47.5 FEET EAST-NORTHEAST 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 RECOVERED IN GOOD CONDITION.

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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