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Details for Benchmark: OH1002

N 43° 47.483 W 117° 50.900 (NAD 83)

Altitude: 2755.51

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

Location:
In MALHEUR county, OR View Original Datasheet
Designation:
P 20
Marker Type:
chiseled square
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Maybe another RR spike in place of a chiseled square. See also OH0819.

[Photos:]
photoOH1002 P 20 1920
RR SPIKE - NOT A CHISELED SQUARE
photoOH1002 RR SPIKE
CEMENTED INTO CHISELED SQUARE?
photoOH1002 RR CULVERT 57.87
THIS IS THE CORRECT ONE AT THE RIGHT L/L

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1943 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1943 1.5 MI W FROM BOHNA. 1.5 MILES WEST ALONG THE UNION PACIFIC RAILROAD FROM THE STATION AT BOHNA, MALHEUR COUNTY, AND ON THE SOUTH HEADWALL OF CULVERT 57.87. A CHISELED SQUARE.

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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