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Details for Benchmark: CZ0491

N 32° 27.267 W 111° 12.267 (NAD 83)

Altitude: 1999.63

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
248+37.9
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found in good shape.

[Photos:]
photoCZ0491
photoCZ0491 w GPSr
N 32° 27.271 W 111° 12.284

Found in good shape, as described.

[Photos:]
photoCZ0491

Recovered on a run for some benchmarks.

[Photos:]
photoCZ0491

found on a benchmark run with Carmel

[Photos:]
photo248+37.9

Recovered as described, in good condition.

[Photos:]
photo248+37.9 / CZ0491
A close-up of the mark.

RECOVERED IN GOOD CONDITION

[Photos:]
photoDISK
BM DISK
photoSETTING
THE DISK IS SET IN THE CONCRETE HEADWALL OF A CULVERT UNDER THE WESTBOUND FRONTAGE ROAD OF INTERESTATE 10

Documented History (by the NGS)

1/1/1931 by AZHD (MONUMENTED)
1/1/1951 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1951 0.4 MI SE FROM MARANA. 0.4 MILE SOUTHEAST ALONG STATE HIGHWAY 84 AND SOUTHERN PACIFIC RAILROAD FROM THE POST OFFICE AT MARANA, AT THE SOUTHEAST CORNER OF THE MARANA SCHOOL YARD, AT A CONCRETE HIGHWAY BRIDGE, IN THE TOP OF THE CENTER OF THE NORTHEAST CONCRETE CURBING, 16 FEET NORTHEAST OF THE CENTER LINE OF THE NORTHWEST BOUND TRAFFIC LANE OF AND ABOUT 1 FOOT HIGHER THAN THE HIGHWAY.
1/1/1960 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1960 RECOVERED IN GOOD CONDITION.
1/1/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 34.4 KILOMETERS (21.4 MILES) NORTHWEST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT TUCSON, AT A 5-CHANNEL FRONTAGE ROAD (OLD U. S. HIGHWAY 84) CONCRETE BRIDGE IN THE TOP AND CENTER OF THE NORTHEAST HEADWALL, 34.5 METERS (113 FEET) SOUTHWEST OF THE SOUTHWEST RAIL, 8.6 METERS (28.2 FEET) NORTHWEST OF THE SOUTHEAST END OF THE HEADWALL AND 5.0 METERS (16.4 FEET) NORTHEAST OF THE CENTERLINE OF THE ROAD. THE MARK IS 0.3 M ABOVE THE ROAD.
2/4/1996 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1996 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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