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Details for Benchmark: LC0665

N 40° 44.483 W 088° 52.900 (NAD 83)

Altitude: 751.62

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

Location:
In MCLEAN county, IL View Original Datasheet
Designation:
E 43
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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This one is in my current home town of Gridley. There will be a new tower constructed very soon. The foundation is finished but the tower has not arrived. I wonder if there will be a new benchmark placed.

Found in middle of Gridley just as described. Benchmarking wouldn't be nearly as much fun if they were all this easy - or, maybe it would. It's pretty worn down but can still be read.

[Photos:]
photoLC0665 in Gridley, Illinois
photoWater tower in Gridley, IL, LC0665 at base of it.

found

[Photos:]
photolc0665.jpg
photolc0665 1.jpg
photolc0665 2.jpg

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 AT GRIDLEY. AT GRIDLEY, MCLEAN COUNTY, ON THE TOLEDO, PEORIA AND WESTERN RAILROAD, 60 FEET NORTH OF THE CENTERLINE OF THE TRACK, AT THE SOUTHEAST LEG OF A WATER TOWER, IN THE TOP OF THE SOUTH CORNER OF THE CONCRETE PEDESTAL, AND ONE FOOT ABOVE GROUND. A STANDARD DISK, STAMPED 43 1934.

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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