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Details for Benchmark: ME1731

N 41° 40.796 W 087° 58.685 (NAD 83)

Altitude: 619.41

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

Location:
In COOK county, IL View Original Datasheet
Designation:
D 140
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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Found the mark in good condition.
Our Lady of Victory Convent is still here.

[Photos:]
photoME1731
photoLooking NE towards the entrance driveway

It's there! This benchmark is just a few hundred feet from my house, so after I noticed it listed, it became quite possibly the easiest find of my geocaching career. If it weren't so near a busy road, I might have gotten away with walking through the yard to it in my boxers. Then again, maybe that's a bad idea. ;)

Agree with Lemontster's comments, but the mark still stands. Coords were spot-on.

[Photos:]
photoME 1731

Found it. Some of the locating landmarks as listed in the 1947 documentation are no longer there, but the benchmark is clearly marked and in good shape.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 1.4 MI NE FROM LEMONT. ABOUT 1.35 MILES NORTHEAST ALONG THE CHICAGO-JOLIET ROAD FROM THE ALTON RAILROAD STATION AT LEMONT, AT THE ENTRANCE DRIVE WAY TO OUR LADY OF VICTORY CONVENT, 78 FEET NORTH OF THE NORTH CORNER OF A TWO STORY HOUSE, 40 FEET SOUTHWEST OF THE CENTER LINE OF THE DRIVE WAY, 18 FEET SOUTHEAST OF THE CENTER LINE OF THE ROAD, 1 FOOT NORTHWEST OF THE FENCE LINE, 5 FEET SOUTHEAST OF A TELEPHONE POLE, 2 FEET NORTHEAST OF A WHITE WOODEN WITNESS POST, ABOUT 1/2 FOOT ABOVE THE ROAD AND SET IN THE TOP OF A CONCRETE POST PROJECTING 4 INCHES.
01/01/1971 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 MARK NOT FOUND.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 ADDRESS FOR THE MARK-- 1220 MAIN STREET. FRANCISCAN SISTER COVENT 6 FT N.E. OF A POWERLINE POLE, 25 FEET S.W. OF BRICK PILLAR WITH LETTERS FRANCISAN SISTER COVENT.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (CEP) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (MBO) RECOVERED IN GOOD CONDITION.
05/02/1995 by PATRIC (GOOD)
RECOVERY NOTE BY PATRICK ENGINEERING INCORPORATED 1995 (BPG) RECOVERED AS DESCRIBED. ADDRESS FOR MARK-- 14700 MAIN STREET. FRANCISCAN SISTERS OF CHICAGO. STATION MARK IS 6 FT (1.8 M) SOUTHEAST OF A POWERLINE POLE, 9 FT (2.7 M) SOUTH OF THE SOUTH EDGE OF PAVEMENT OF MAIN STREET (CHICAGO AND JOLIET ROAD). STATION IS SUITABLE FOR G.P.S. OBSERVATIONS WHEN TREES ARE NOT IN FULL BLOOM.
08/02/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in October 1999.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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