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Details for Benchmark: MB0743

N 41° 00.733 W 080° 49.133 (NAD 83)

Altitude: 1085.27

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

Location:
In MAHONING county, OH View Original Datasheet
Designation:
ELL 24
Marker Type:
survey 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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This marker is below the road surface at the intersection of two country roads. I had to dig through several inches of mud to see the marker. My GPS coordinates were: N 41° 0.740, W 80° 49.139.

[This entry was edited by shorbird on Tuesday, January 17, 2006 at 4:10:42 AM.]

[Photos:]
photoMark with cover, Ellsworth Twp. OH
photoMark in road with cover off, Ellsworth Twp, OH
photoCloseup of mark in road, Ellsworth Twp, OH
photoLooking north from ELL 24, Ellsworth Twp OH
This view is looking north on Knauf Rd. from the marker.
photoLooking west from the marker, Ellsworth Twp OH
This view is looking west on Berlin Station Rd. from the marker.

Documented History (by the NGS)

Unknown by OH-099 (MONUMENTED)
01/01/1950 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1950 2.8 MI SE FROM ELLSWORTH. ABOUT 2.0 MILES EAST ALONG U.S. 224 FROM THE POST OFFICE AT ELLSWORTH, THENCE ABOUT 0.85 MILE SOUTH ALONG KNAUF ROAD, AT THE INTERSECTION OF THE CENTERLINE OF BERLIN STATION-ELLSWORTH LAKE ROAD AND THE CENTERLINE OF KNAUF ROAD. A MAHONING COUNTY DISK SET IN THE TOP OF A PRECAST CONCRETE POST, WHICH IS SET IN A CAST IRON WELL AND COVERED WITH A CAST IRON COVER STAMPED WITH A LARGE M. THE MARK IS ABOUT 8 INCHES BELOW THE SURFACE OF THE HIGHWAY.
08/22/1996 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1996 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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