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Details for Benchmark: PB0678

N 43° 55.900 W 121° 21.133 (NAD 83)

Altitude: 4267.14

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

Location:
In DESCHUTES county, OR View Original Datasheet
Designation:
D 459
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Benchmark #358. Found in good condition at described location. Volcanoguy

[Photos:]
photoPB0678
N 43° 55.926 W 121° 21.118

A short walk from the old highway to the east. In good condition as described.

[Photos:]
photoCloseup of benchmark.
photoLooking southwest at highway.
Benchmark in foreground.

This was a neat one... set directly into lava rock and very accessible from the highway. There is not much of a shoulder on the road though, so be careful. The post supporting the witness sign is there, but the sign is not. Also, this is an interesting BM Because the sides are raised up so the BM is sort of a 'knob' rather than set flush with the ground. This is a State Highway Dept BM.

[Photos:]
photoThe BM. Note raised sides and St. Hwy Dept.
photoThe setting around the Mark.
The actual WP is missing, the white sign you see is very close by but is not the WP.

Documented History (by the NGS)

01/01/1954 by ORHD (MONUMENTED)
07/21/1988 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1988 15.1 KM (9.40 MI) SOUTHERLY ALONG U.S. HIGHWAY 97 FROM THE SOUTH JUNCTION OF U.S. HIGHWAY 20 IN BEND, ON A LEDGE AT THE SOUTHWEST BASE OF A DOME SHAPED LAVA OUTCROP, 33.5 M (109.9 FT) EAST OF THE CENTERLINE OF THE HIGHWAY, 15.2 M (49.9 FT) NORTH OF THE CENTER OF A TRACK ROAD, 0.6 M (2.0 FT) NORTHEAST OF A STATE WITNESS POST, AND 1.5 M (4.9 FT) BELOW THE LEVEL OF THE HIGHWAY.

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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