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Details for Benchmark: MF0417

N 41° 18.783 W 088° 36.583 (NAD 83)

Altitude: 498.6

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

Location:
In LA SALLE county, IL View Original Datasheet
Designation:
M 141 RESET 1963
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found in good condition.

[Photos:]
photoMF0417
N 41° 18.742 W 088° 36.601

Found at the above coords.

[Photos:]
photoMF0417 with Initial Point geocoin
photoMF0417 setting (viewing southwest)

found

[Photos:]
photomf0417.jpg

Documented History (by the NGS)

1/1/1963 by ILDPW (MONUMENTED)
DESCRIBED BY ILLINOIS DEPARTMENT OF PUBLIC WORKS 1963 AT SENECA. AT SENECA, ABOUT 0.15 MILE SOUTH ALONG STATE HIGHWAY 170 FROM THE POST OFFICE, ABOUT 0.1 MILE SOUTH OF THE BRIDGE OVER THE ILLINOIS AND MICHIGAN CANAL, AND SET IN THE TOP OF THE SOUTH END OF THE WEST CONCRETE HEADWALL OF A 12-FOOT CONCRETE BOX CULVERT UNDER THE HIGHWAY, 35 FEET 4 INCHES WEST OF THE CENTERLINE OF THE HIGHWAY, 0.5 FEET NORTH OF THE SOUTH END OF THE HEADWALL.
1/1/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (IB) RECOVERED IN GOOD CONDITION.
8/15/1997 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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