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Details for Benchmark: MG0022

N 41° 30.967 W 090° 26.850 (NAD 83)

Altitude: 576.89

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

Location:
In ROCK ISLAND county, IL View Original Datasheet
Designation:
RV 12
Marker Type:
rivet
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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I was in the area this evening to deliver a pizza to a friend who's stuck inside. Decided since I was less than half a mile away from this mark, I'd see if I could track it down. I found a decent spot to park in the alley and hoofed it over here. Thanks to the last set of coordinates from 2003, I was able to make the fast find on this mark. The rivet is still in good shape holding steady.

N 41° 30.985 W 090° 26.852

Found today on my way home from finding (or nearly finding) 5 other benchmarks. Approached from alley parking lot and went through trashed out wooded area to find.
Surveyors must be out re-marking these benchmarks, as this has a new stick and paint label, as do others in the area. (see pictures)

Hopefully, these new coordinates will help.

[last edit: 12/23/2003 12:52:34 PM PST]

[Photos:]
photoMG0022(2)
Close-up of the mark.
photoMG0022 (1)
As it looked today, looking west. Pretty hard to miss now.

I might give this up. My GPS had me in the alley, 25 yards South of here.

Found this one today, its close to home for me.

Second of four found today.

Second of two benchmarks we decided to find tonight. I was not familiar with rivets as benchmarks but this one was in place where advertised. It was an interesting area to look around in. There seems to be a makeshift camp in the woods along the tracks.

[last edit: 8/2/2002 5:29:17 AM PST]

[Photos:]
photoMG0022 Facing West
Along the tracks, as viewed facing west.
photoMG0022 Closeup
Close up view of the rivet benchmark.

Documented History (by the NGS)

Unknown by RIRR (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 AT EAST MOLINE. AT EAST MOLINE, ROCK ISLAND COUNTY, ON THE CHICAGO, ROCK ISLAND AND PACIFIC RAILWAY, 0.3 MILE WEST OF THE STATION, AT A BRIDGE, IN THE TOP OF THE SOUTH END OF THE WEST CONCRETE ABUTMENT, AND 50 FEET NORTH OF THE CENTERLINE OF THE TRACK AT 6TH STREET. A STANDARD MONEL-METAL RIVET.
08/16/1996 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1996 RECOVERED IN GOOD CONDITION.
06/06/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 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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