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Details for Benchmark: OH0820

N 43° 58.000 W 117° 16.383 (NAD 83)

Altitude: 2270.36

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

Location:
In MALHEUR county, OR View Original Datasheet
Designation:
G 21
Marker Type:
chiseled square
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Name for this outlined chiseled square dates it to 1920.

[Photos:]
photoOH0820 G 21 1920
photoOH0820 NE
RR CULVERT 17.62

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1935 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1935 2.1 MI SW FROM VALE. 2.1 MILES SOUTHWEST ALONG THE UNION PACIFIC RAILROAD FROM THE STATION AT VALE, MALHEUR COUNTY, ABOUT 125 FEET SOUTHWEST OF THE TRESTLE OVER BULLY CREEK, IN THE NORTHWEST HEADWALL OF CULVERT 17.62, 9 INCHES FROM THE SOUTHWEST END. 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 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
  • 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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