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Details for Benchmark: AH7497

N 35° 10.700 W 103° 42.250 (NAD 83)

Altitude: 4015.52

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

Location:
In QUAY county, NM View Original Datasheet
Designation:
26+52.25
Marker Type:
survey disk
Setting:
retaining walls, concrete ledge, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered in good condition, as described. GPS (HH2) co-ordinates N 35Deg 10.731' W 103Deg 42.272'.

[Photos:]
photo26+52.25 / AH7497
A close-up of the mark, with the GPSr.
photo26+52.25 / AH7497
A close-up of the mark alone.
photo26+52.25 / AH7497
A wide view of the general area, looking east.

Found as described and at handheld coordinates N35-10.732 W103-42.270.

[Photos:]
photoAH7497 - the Mark
photoAH7497 in Tucumcari, NM
Looking northeast from the direction of the described pipe culverts, the mark is below the white notebook on the barbed wire fence.

Documented History (by the NGS)

Unknown by NMHC (MONUMENTED)
02/03/1999 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (GAS) 2.0 KM (1.25 MI) EASTERLY ALONG U.S. HIGHWAY 66 FROM THE JUNCTION OF STATE HIGHWAYS 104 AND 209 IN TUCUMCARI, 48.1 M (157.8 FT) NORTH OF THE EAST END OF THE MOST NORTHERLY OF 2 PIPE CULVERTS UNDER THE HIGHWAY, 31.9 M (104.7 FT) NORTHWEST OF A FENCE CORNER, 30.2 M (99.1 FT) NORTHEAST OF THE HIGHWAY CENTERLINE, 2.0 M (6.6 FT) BELOW THE LEVEL OF THE HIGHWAY, 0.4 M (1.3 FT) SOUTHWEST OF A WITNESS POST, 0.1 M (0.3 FT) NORTHEAST OF A FENCE, AND THE MONUMENT PROJECTS 0.1 M (0.3 FT) ABOVE THE GROUND SURFACE. NOTE--THE MONUMENT IS ON HIGHWAY RIGHT-OF-WAY.

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 April 2000.
  • 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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