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Details for Benchmark: CZ2061

N 32° 46.613 W 111° 39.204 (NAD 83)

Altitude: 1506.6

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
AK 51
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:

Reference Points

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Found in good shape, as described.

[Photos:]
photoCZ2061
photoCZ2061 Wider View
photoCZ2061 Petals
photoCZ2061 Petals from the NW

Recovered as described, in good condition.

[Photos:]
photoAK51 / CZ2061
A close-up of the mark, with the GPSr.
photoAK 51 / CZ2061
A close-up of the mark alone.
photoAK 51 / CZ2061
A wide view of the general area, looking east.

After finding out about this series of benchmarks in the Casa Grande area, that are similar to the ones near my [url=http://www.geocaching.com/seek/cache_details.aspx?guid=6d6ac28b-2223-4855-ae20-283eecb62368] Lonesome Bush Cache, [/url] we had to come and check them out.

We came over here from the other side of the Casa Grande Mountains and benchmark [url=http://www.geocaching.com/mark/details.aspx?PID=CZ2314] CZ2314. [/url] We drove down this road and found this benchmark in the desert brush. There are likely more down the road, but given its current state of disrepair, we chose not to go at that time. We left and headed down Sunland Gin Road to locate more benchmarks, including the one still left within the town [url=http://www.geocaching.com/mark/details.aspx?PID=CZ2166] CZ2166. [/url]

Reportedly these benchmarks were for camera alignment and resolution studies. There are others believed to be in the area consisting of lines of different length and some with a bullseye pattern, but I have not found them or seen reports of them as yet.

This benchmark is not visible in the aerial photo, however part of that intersection is not as readily visible, so it may still be there.

Documented History (by the NGS)

1/1/1966 by DMA (MONUMENTED)
DESCRIBED BY DEFENSE MAP AGENCY 1966 T-7-S. R-7-E. IN SECTION 32 NEAR THE NORTHWEST CORNER. THE STATION MARK IS A CORPS OF ENGINEERS, U.S. ARMY DISK CENTERED IN THE TOP OF A ROUND CONCRETE POST 8 INCHES IN DIAMETER PROJECTING 0.4 FOOT ABOVE THE SURFACE OF THE GROUND. THE MARK IS STAMPED--AK 51 1966 ARMY MAP SERVICE. THE STATION MARK IS LOCATED 242 FEET SOUTH OF THE CENTERLINE OF EAST-WEST ROAD. 130 FEET EAST OF THE CENTERLINE OF NORTH-SOUTH ROAD. 81 FEET EAST OF THE CENTERLINE OF NORTH-SOUTH LEVEE. 202 FEET SOUTH OF THE CENTERLINE OF EAST-WEST LEVEE. TO REACH FROM THE JUNCTION OF STATE ROUTES 84 AND 93 IN CASA GRANDE, ARIZONA GO SOUTHEAST ON 84 AND 93 FOR 6.4 MILES TO ARIZONA CITY ROAD. TURN RIGHT AND GO SOUTH ON ARIZONA CITY ROAD FOR 3.2 MILES TO CROSSROAD. TURN LEFT AND GO EAST 1.0 MILE TO THE STATION SITE.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1993.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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