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Details for Benchmark: AH5040

N 45° 35.788 W 122° 35.611 (NAD 83)

Altitude: 47

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

Location:
In MULTNOMAH county, OR View Original Datasheet
Designation:
TRAV1
Marker Type:
spike
Setting:
driven into the ground
Stability:
Mark of questionable or unknown stability.

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Recovered at the adjusted coordinates. The top of the rod was at a slight angle.

  • Found at 0.4 feet south of the south edge of the asphalt bike path.
  • Found at 50 feet east-southeast from a white “NO MOTORIZED VEHICLES ALLOWED” signpost. (The signpost is a substantial metal I-beam or section of railroad rail.)
  • The top of the rod is 0.25 feet underground.

We were unable to confirm the distance from the runway extension.

[Photos:]
photoAH5040 - Rod Cap - Portland, Oregon
photoAH5040 - Rod top.
Note that it is at an angle.
photoAH5040 - Coordinates.
(Photo included for Spring 2009 “Settings” contest.)
photoAH5040 Eye level view.
The top of the photo is roughly south-southwest.
photoAH5040 - Looking east-southeast alone bike path.
The rod is at lower right.
photoAH5040 - Looking east-southeast with sign.
The yellow arrow points at the location of the rod. On the right side foreground is the back of the “No Motorized Vehicles” sign.

Documented History (by the NGS)

01/01/1992 by MGSINC (MONUMENTED)
DESCRIBED BY MINISTER AND GLAESER 1992 (DRP) THE STATION, TRAV1, IS LOCATED ALONG THE SOUTH SHORE OF THE COLUMBIA RIVER NEAR THE PORTLAND INTERNATIONAL AIRPORT ALONG THE NORTH SIDE OF MARINE DRIVE APPROXIMATELY 1000 FEET EAST OF THE NORTHERLY EXTENTION OF RUNWAY 2-20. THE STATION IS A 1/2 INCH DIAMETER IRON ROD DRIVEN INTO THE GROUND ALONG THE SOUTH EDGE OF THE PAVED BIKE PATH.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in November 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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