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Details for Benchmark: DV1230

N 33° 03.650 W 112° 14.950 (NAD 83)

Altitude: 1302.44

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
H 422
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Recovered as described, in good condition.

[Photos:]
photoH 422 / DV1230
A close-up of the mark, with the GPSr.
photoH 422 / DV1230
A close-up of the mark alone.
photoH 422 / DV1230
A wide view of the general area, showing the updated railroad bridge.

Documented History (by the NGS)

01/01/1980 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1980 2.0 KM NE FROM MOBILE. 2.0 KILOMETERS (1.25 MILES) NORTHEAST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE NELSON ELEMENTARY SCHOOL IN MOBILE, SET IN TOP OF THE NORTHWEST END OF THE SOUTHWEST CONCRETE ABUTMENT OF RAILROAD BRIDGE 885.53, 1.8 METERS (6 FEET) NORTHWEST OF THE NORTHWEST RAIL. THE MARK IS 1.5 M BELOW TRACKS.

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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