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Details for Benchmark: NZ0940

N 42° 26.433 W 122° 59.917 (NAD 83)

Altitude: 1138.08

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

Location:
In JACKSON county, OR View Original Datasheet
Designation:
Z 748
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01/01/1988 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1988 8.2 KM (5.10 MI) EAST FROM GOLD HILL. 8.2 KM (5.10 MI) EASTERLY ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE JUNCTION OF FOURTH STREET IN GOLD HILL, NEAR THE EAST END OF A 40 BY 350 FOOT AREA OF OUTCROPPING BEDROCK, 1.3 KM (0.80 MI) WEST OF THE GOLD RAY DAMN, 21.6 M (70.9 FT) NORTHEAST OF THE NEAR RAIL, AND 6.9 M (22.6 FT) SOUTHWEST OF THE CENTER OF A DIRT ROAD. THE MARK IS 0.3 METERS NE FROM A WITNESS POST THE MARK IS 1.0 M ABOVE THE ROAD.

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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