Details for Benchmark: CG0356
N 31° 58.667 W 110° 30.867 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In PIMA county, AZ View Original Datasheet
- A 313
- Marker Type:
- bench mark disk
- massive structures
- Probably hold position/elevation well.
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Documented History (by the NGS)
|01/01/1952 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1952
4.9 MI W FROM MESCAL. 4.9 MILES WEST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE RAILROAD STATION AT MESCAL, AT THE U.S. HIGHWAY 80 OVERPASS 1019.67, SET VERTICALLY IN THE EAST FACE OF THE NORTHEAST COLUMN OF THE NORTHWEST CONCRETE PIER, 9.1 FEET NORTHWEST OF THE NORTHWEST RAIL, 4 FEET ABOVE THE GROUND, 1.6 FEET SOUTH OF THE NORTH EDGE OF COLUMN, ABOUT 3 FEET HIGHER THAN THE TRACKS.
|01/01/1960 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1960
RECOVERED IN GOOD CONDITION.
|01/01/1979 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
4.9 MILES WEST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT MESCAL, AT INTERSTATE 10 AMOLE OVERPASS, BETWEEN THE TWO FREEWAY BRIDGES, SET VERTICALLY IN THE EAST FACE OF THE NORTHEAST COLUMN OF THE NORTHWEST CONCRETE PIER (FORMER U. S. HIGHWAY 80 OVERPASS 1019.67), 9 FEET NORTHWEST OF THE NORTHWEST RAIL, 1.5 FEET SOUTH OF THE NORTH EDGE OF THE COLUMN AND 4 FEET ABOVE THE GROUND. THE MARK IS 3 FT ABOVE TRACKS.
- 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.