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Details for Benchmark: CZ1020

N 32° 50.083 W 111° 41.333 (NAD 83)

Altitude: 1454.43

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
CASA GRANDE AZ MK 3
Marker Type:
reference mark disk
Setting:
massive retaining walls
Stability:
Probably hold position/elevation well.

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Found in good shape.

[Photos:]
photoCZ1020
photoCZ1020 w GPSr

Found in good shape, as described.

[Photos:]
photoCZ1020
photoCZ1020 Wider View

Found as described and in good condition....

Wish I could say the same for the bank of the irrigation canal next to the road, it has some BIG erosion going on....

found in good condition

[Photos:]
photocz1020 marker

Recovered in good condition. Handheld GPSr indicated coordinates of N 32 50 05.6 W 111 41 19.8 (DMS).

[Photos:]
photoCZ1020 CASA GRANDE AZ MK 3 closeup
photoWith the GPSr

Recovered as described, in good condition.

[Photos:]
photoCASA GRANDE AZ MK 3 / CZ1020
A close-up of the mark, with the GPSr.
photoCASA GRANDE AZ MK 3 / CZ1020
A close-up of the mark alone.
photoCASA GRANDE AZ MK 3 / CZ1020
A wide view of the general area, looking southeast.

[i]CZ1020_MARKER: DR = REFERENCE MARK DISK
CZ1020_SETTING: 37 = RETAINING WALL
CZ1020_STAMPING: CASA GRANDE U.S.G.S. AZIMUTH NO.3 1935
CZ1020_MAGNETIC: N = NO MAGNETIC MATERIAL
CZ1020_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
CZ1020_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
CZ1020+SATELLITE: SATELLITE OBSERVATIONS - December 05, 1991[/i]

Information on the marker confirmed by information in the description.

Azimuth mark is in good condition as found as described.

[Photos:]
photoCZ1020

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
01/01/1967 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1967 4.85 MI SE FROM CASA GRANDE. ABOUT 4.85 MILES SOUTHEAST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT CASA GRANDE, IN S 2, T 7 S, R 6 E, 0.2 MILE NORTHWEST OF THE RAILROAD UNDERPASS FOR INTERSTATE HIGHWAY 10, 4 1/2 POLES SOUTHEAST OF BENCH MARK W 278=1450(USGS), AT THE CROSSING OF THE RAILROAD AND AN IRRIGATION CANAL, AT THE JUNCTION OF TWO IRRIGATION CANALS, 103 FEET NORTHEAST OF THE NORTHEAST RAIL OF THE TRACK, 42 FEET SOUTHWEST OF THE CENTER LINE OF THE SOUTHWEST TRAFFIC LANE FOR STATE HIGHWAY 84, SET IN THE TOP OF THE SOUTHWEST CONCRETE WING WALL FOR THE FOUNDATION OF THE HEADGATE IN THE IRRIGATION CANAL LEADING NORTHWEST, 10 FEET SOUTHEAST OF THE CENTER LINE OF A DIRT ROAD WHICH IS ON THE NORTHWEST LEVEE OF AN IRRIGATION CANAL, 3.7 FEET SOUTHEAST OF A VERTICAL SECTION OF RAIL PROJECTING 3 FEET, AND ABOUT 3 FEET BELOW THE LEVEL OF THE TRACKS.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 RECOVERED IN GOOD CONDITION.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 RECOVERED IN GOOD CONDITION.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION.
12/05/1991 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 8.2 KM (5.10 MI) SOUTHEASTERLY ALONG STATE HIGHWAY 84 FROM THE JUNCTION OF STATE HIGHWAYS 93 (PINAL AVENUE) AND 287 (FLORENCE BOULEVARD) IN CASA GRANDE, IN TOP OF AND 1.0 M (3.3 FT) SOUTHEAST OF THE NORTHWEST END OF A CONCRETE RETAINING WALL BETWEEN TWO HEAD GATES AT THE T-JUNCTION OF TWO CANALS, 20.4 M (66.9 FT) SOUTHWEST OF THE HIGHWAY CENTERLINE, AND 0.6 M (2.0 FT) BELOW THE LEVEL OF THE HIGHWAY.

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 November 1993.
  • 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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