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Details for Benchmark: LA0024

N 40° 53.833 W 084° 03.817 (NAD 83)

Altitude: 777.36

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

Location:
In ALLEN county, OH View Original Datasheet
Designation:
M 168
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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N 40° 53.844 W 084° 03.837
Station recovered, as described, in good condition.

[Photos:]
photoM 168
Looking West
photoM 168
Coordinates
photoM 168
N 40° 53.843 W 084° 03.839

Station recovered in good condition. Coordinates listed above. Remove station description references to the DTIRR rail and sign, which has been abandoned, the fence line (fence corner still exists), the white wooden witness post, the power pole 683/153, all of which no longer exist. A carsonsite witness post stands one foot north of the station, and the station is flush with the ground surface.

[Photos:]
photoBM_LA0024_3.jpg
Looking NW
photoBM_LA0024_2.jpg
photoBM_LA0024_1.jpg

Documented History (by the NGS)

01/01/1954 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1954 1.6 MI S FROM COLUMBUS GROVE. ABOUT 1.6 MILES SOUTH ALONG THE BALTIMORE AND OHIO RAILROAD FROM THE STATION AT COLUMBUS GROVE, AT THE CROSSING OF BEGG ROAD, NEAR TELEPHONE POLE 141/15, 123 FEET EAST OF EAST RAIL OF B. AND O. RR, 34 FEET EAST OF EAST RAIL OF THE DETROIT, TOLEDO AND IRONTON RAILROAD, 22 FEET NORTH OF CENTER LINE OF BEGG ROAD, 19 FEET NORTHEAST OF A CROSSING SIGN FOR D.T.I. RR, 10 FEET EAST OF A CONCRETE FENCE CORNER POST, 2 FEET SOUTH OF A FENCE LINE, 5 1/2 FEET WEST OF POWER POLE NO. 683/153, 2 FEET EAST OF A WHITE WOODEN WITNESS POST, ABOUT 6 FEET BELOW LEVEL OF B. AND O. RR AND SET IN THE TOP OF A CONCRETE POST PROJECTING 3 INCHES.

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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