Skip to content

Details for Benchmark: MG0021

N 41° 30.983 W 090° 26.683 (NAD 83)

Altitude: 578.06

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

Location:
In ROCK ISLAND county, IL View Original Datasheet
Designation:
V 52
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

The earth appears to have been moved and may be buried.

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 AT EAST MOLINE. AT EAST MOLINE, ROCK ISLAND COUNTY, ON THE CHICAGO, ROCK ISLAND AND PACIFIC RAILWAY, 7 POLES WEST OF THE STATION, AT A STREET CROSSING, 66 FEET EAST OF THE CENTERLINE OF 7TH STREET, 22 FEET NORTH OF THE CENTERLINE OF THE NORTH MAIN TRACK, AND 3 FEET WEST OF A POLE. A STANDARD DISK, STAMPED V 52 1934 AND SET IN THE TOP OF A CONCRETE POST.
05/09/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JEB) MARK NOT FOUND.
08/16/1996 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1996 MARK NOT FOUND.
06/06/1997 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1997 MARK NOT FOUND.

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.

Advertising with Us