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Details for Benchmark: MF1169

N 41° 47.100 W 089° 52.333 (NAD 83)

Altitude: 683.41

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

Location:
In WHITESIDE county, IL View Original Datasheet
Designation:
X 47
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.

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I decided to celebrate May Day by checking out a bunch of benchmarks on the way out to Dixon, Illinois. I found this benchmark just as described. I agree with the last finder...looks like someone took an ax to this benchmark! Huge gash down the center of it.

N 41 47.098 W 89 52.332

[Photos:]
photoMF1169

There is a nice pile of firewood just to the north of the benchmark. They must not have hurt the ax too much. An easy find.

[Photos:]
photoMF1169 Close-up
photoLooking to the southwest.

Found POOR. The disk has a deep gouge in it. My guess: from an ax. The disk is located as previously described, and at the south end of a large, oval woodpile. Handheld coordinates are N41-47.092 W089-52.330.

[Photos:]
photoMF1169 BMDisk X 47
photoMF1169 BMDisk X 47 in Whiteside Co., IL
Looking east from the center of Round Grove Road, the disk is at the orange witness post with the white notebook on it, center.

Documented History (by the NGS)

01/01/1934 by CGS (MONUMENTED)
01/01/1944 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1944 AT ROUND GROVE. AT ROUND GROVE, WHITESIDE COUNTY, ON THE CHICAGO AND NORTH WESTERN RAILWAY, 4 POLES WEST OF THE STATION, AT A ROAD CROSSING, 48 FEET EAST OF THE CENTERLINE OF THE ROAD, 45 FEET NORTH OF THE CENTERLINE OF THE TRACK, 4 FEET SOUTHWEST OF A POLE, AND ABOUT 2 FEET LOWER THAN THE RAIL. A STANDARD DISK, STAMPED X 47 1934 AND SET IN THE TOP OF A CONCRETE POST.
08/22/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 RECOVERED IN GOOD CONDITION.
05/01/1999 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1999 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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