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Details for Benchmark: RD0005

N 45° 32.683 W 122° 23.417 (NAD 83)

Altitude: 55.99

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

Location:
In MULTNOMAH county, OR View Original Datasheet
Designation:
POST RM 1
Marker Type:
reference mark disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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Quick easy find. As always be aware of traffic around. Still in very good condititon!!

[Photos:]
photoreference mark---POST RM 1 close up
photoreference mark--POST RM 1 facing North

Walked right to it.

[Photos:]
photoDSC02250
actual benchmark
photoGPS coordinates at mark
photolooking west

Happy to find this one, but watch out for the cars!

[Photos:]
photoReference Mark 1
photoReference Mark one and coordinates
45,32.691N, 122,23.438W

Documented History (by the NGS)

1/1/1956 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1956 0.5 MI N FROM TROUTDALE. 0.2 MILE WEST ALONG EAST COLUMBIA STREET FROM THE POST OFFICE AT TROUTDALE, THENCE 0.3 MILE NORTH ALONG A PAVED ROAD, AT TROUTDALE JUNCTION, IN T 1 N-R 3 E, AT THE SOUTHEAST CORNER OF A CONCRETE OVERPASS, IN TOP OF THE EAST END OF THE SOUTH CONCRETE CURBING, 23.5 FEET SOUTH OF THE CENTER LINE OF THE SOUTH LANES OF U.S. HIGHWAY 30, AND ABOUT 1/2 FOOT HIGHER THAN THE HIGHWAY.
1/1/1966 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1966 RECOVERED IN GOOD CONDITION.
1/1/1987 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION, THE DESCRIPTION IS ADEQUATE. NOT LEVELED THIS SURVEY.
1/1/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (FV) RECOVERED IN GOOD CONDITION.
6/28/1994 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1994 RECOVERED IN GOOD CONDITION.

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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