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Details for Benchmark: ME1726

N 41° 40.567 W 087° 59.917 (NAD 83)

Altitude: 597.46

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

Location:
In COOK county, IL View Original Datasheet
Designation:
F 140
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found with lemon16 on our 2nd annual "Benchmark Hunting in the Snow" outing.

found it

Found in good condition.

[Photos:]
photoME1726 Setting
photoLooking North
photoME1726
N 41° 40.572 W 087° 59.994

Found close to the above coords; I marked a WP as I drove away soaked from the rain! Regardless, the mark's published coords are about 350 feet off.

The mark is in good shape and currently it rather hidden from view by two unused US mailboxes on that corner of the building. See pics.

[Photos:]
photoME1726: looking NNE
photoME1726

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 AT LEMONT. AT LEMONT, SET VERTICALLY IN THE SOUTHEAST FACE AT THE SOUTH CORNER OF THE POST OFFICE BUILDING, 1 FOOT NORTHEAST OF THE SOUTH CORNER AND 2.5 FEET ABOVE THE GROUND.
01/01/1971 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 RECOVERED IN GOOD CONDITION.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
01/01/1983 by MARCHE (GOOD)
RECOVERY NOTE BY MARCHESE AND SONS 1983 RECOVERED IN GOOD CONDITION.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (MBO) RECOVERED IN GOOD CONDITION.
10/20/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (MBO) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (MBO) RECOVERED IN GOOD CONDITION.
08/02/1997 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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