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Details for Benchmark: CZ1040

N 32° 46.539 W 111° 35.617 (NAD 83)

Altitude: 1527.97

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
195 1/2
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Looked for this mark, but did not find it. However, I did find a mark stamped A279 RESET at the same coordinates. Given the earlier descriptions of the poor condition of this mark, which was stamped A279, it would appear it has been removed and reset in a new foundation.

[Photos:]
photoIMAG0247
photoIMAG0248
photoIMAG0249

Recovered as described, in good condition. The boulder seems solid enough at this time, but I didn't try to move it, for fear that I actually might.

[Photos:]
photo195 1/2 / CZ1040
A close-up of the mark, with the GPSr.
photo195 1/2 / CZ1040
A close-up of the mark alone.
photo195 1/2 / CZ1040
A wider view of the area, looking generally north, showing the unusual monumentation technique. S 516 is there to the left.
N 32° 46.533 W 111° 35.621

Bench Mark 195 1/2 was recovered as described in POOR condition. It was deemed to be poor, due to the erosion around the base of the concrete.

This mark is about 3.5 feet northwest of Metal Rod S 516 (CZ2508).

[Photos:]
photoCZ1014 20050703 G
Bench Mark 195 1/2 w/GPSr.
photoCZ1014 20050703 C
Bench Mark 195 1/2.
photoCZ1014 20050703 B
Bench Mark 195 1/2 from Eye Level.
photoCZ1014 20050703 A1 N
North at Bench Mark 195 1/2.
photoCZ1014 20050703 A2 W
West at Bench Mark 195 1/2.

Recovered in questionable condition. The soil is eroding from beneath the concrete. It appears solid for now.

[Photos:]
photoA 279 in Pinal county, Az
photo195 1/2 showing the erosion of the concrete base.

Documented History (by the NGS)

Unknown by USGS (MONUMENTED)
01/01/1967 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1967 2.8 MI NW FROM ELOY. ABOUT 2.8 MILES NORTHWEST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT ELOY, IN S 35, T 7 S, R 7 E, 0.2 MILE SOUTHEAST OF THE CROSSING OF THE RAILROAD AND A ROAD, 15 POLES SOUTHEAST OF MILEPOST NUMBER 930, 5 POLES SOUTHEAST OF RAILROAD BRIDGE NUMBER 930.36, 47 FEET NORTHEAST OF THE NORTHEAST RAIL OF THE TRACKS, 91 FEET SOUTHWEST OF THE CENTER LINE OF STATE HIGHWAY 84, 22 FEET NORTHWEST OF A TELEGRAPH POLE, IN LINE WITH A ROW OF POLES, 2.0 FEET SOUTHEAST OF A METAL WITNESS POST, ABOUT 4 FEET BELOW THE LEVEL OF THE TRACKS, A U.S. GEOLOGICAL SURVEY DISK SET IN THE TOP OF A BOULDER WHICH IS REINFORCED WITH CONCRETE, ABOUT LEVEL WITH THE GROUND.
01/01/1980 by NGS (POOR)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 THE MARK IS 1.5 M BELOW THE RAILS. 18.7 KILOMETERS (11.6 MILES) SOUTHEAST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT CASA GRANDE, 0.4 KILOMETER (0.25 MILE) SOUTHEAST OF THE INTERSECTION OF THE RAILROAD AND HOUSER ROAD, 0.25 KILOMETER (0.15 MILE) SOUTHEAST OF RAILROAD BRIDGE 930.36, SET IN TOP OF A SMALL BOULDER WITHIN A 1- BY 1-METER CONCRETE APRON, PROJECTING 6 CENTIMETERS ABOVE GROUND LEVEL, 14.3 METERS (47 FEET) NORTHEAST OF THE NORTHEAST RAIL, 101.8 METERS (334 FEET) NORTHWEST OF STATE HIGHWAY 84 MILE POST 190 AND 27.7 METERS (91 FEET) SOUTHWEST OF THE CENTERLINE OF THE HIGHWAY. THE MARK IS 0.4 METERS SE FROM A WITNESS POST.
01/01/1980 by NGS (POOR)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 THE MARK IS 1.5 M BELOW THE RAILS. 18.7 KILOMETERS (11.6 MILES) SOUTHEAST ALONG THE SOUTHERN PACIFIC RAILROAD FROM THE STATION AT CASA GRANDE, 0.4 KILOMETER (0.25 MILE) SOUTHEAST OF THE INTERSECTION OF THE RAILROAD AND HOUSER ROAD, 0.25 KILOMETER (0.15 MILE) SOUTHEAST OF RAILROAD BRIDGE 930.36, SET IN TOP OF A SMALL BOULDER WITHIN A 1- BY 1-METER CONCRETE APRON, PROJECTING 6 CENTIMETERS ABOVE GROUND LEVEL, 14.3 METERS (47 FEET) NORTHEAST OF THE NORTHEAST RAIL, 101.8 METERS (334 FEET) NORTHWEST OF STATE HIGHWAY 84 MILE POST 190 AND 27.7 METERS (91 FEET) SOUTHWEST OF THE CENTERLINE OF THE HIGHWAY. THE MARK IS 0.4 METERS SE FROM A WITNESS POST.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION.
12/05/1991 by NGS (POOR)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 0.3 KM (0.20 MI) SOUTHERLY ALONG MAIN STREET FROM THE POST OFFICE IN ELOY, THENCE 4.5 KM (2.80 MI) NORTHWESTERLY ALONG STATE HIGHWAY 84, IN A 7 BY 20 INCH BOULDER SURROUNDED BY A MASS OF CONCRETE, 29.7 M (97.4 FT) SOUTH-SOUTHEAST OF A UTILITY PEDESTAL AND AN UNDERGROUND CABLE WARNING SIGN, 27.7 M (90.9 FT) SOUTHWEST OF THE HIGHWAY CENTERLINE, 14.4 M (47.2 FT) NORTHEAST OF THE NEAR RAIL OF THE SOUTHERN PACIFIC RAILROAD, 1.1 M (3.6 FT) SOUTHEAST OF BENCH MARK S 516, 1.0 M (3.3 FT) BELOW THE LEVEL OF THE HIGHWAY, AND 0.4 M (1.3 FT) SOUTHEAST OF A WITNESS POST. NOTE--THE GROUND HAS ERODED FROM AROUND THE CONCRETE MAKING THE BOULDER VERY LOOSE.
10/21/1992 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992 THE STATION IS LOCATED ABOUT 4.5 KM (2.8 MI) NORTHWEST OF ELOY IN A DIRT STRIP BETWEEN THE SOUTHERN PACIFIC RAILROAD TRACK AND STATE HIGHWAY 84, 0.3 KM (0.2 MI) SOUTHEAST OF THE CROSSING OF HOUSER ROAD AND 0.11 KM (0.07 MI) NORTHWEST OF HIGHWAY MILEPOST 190. OWNERSHIP--SOUTHERN PACIFIC RAILROAD. TO REACH THE STATION FROM THE JUNCTION OF STATE HIGHWAY 84 AND MAIN STREET IN ELOY (ACROSS TRACKS FROM THE TOWN WATER TANKS) GO NORTHWEST ON HIGHWAY 84 FOR 3.49 KM (2.17 MI) TO TUMBLEWEED ROAD ON THE RIGHT. CONTINUE AHEAD FOR 0.98 KM (0.61 MI) TO THE STATION ON THE LEFT. THE STATION IS SET IN A DRILL HOLE IN A PLANTED 0.2 M (0.7 FT) X 0.5 M (1.6 FT) X 1 M (3.3 FT) HIGH BOULDER SURROUNDED BY A LARGE MASS OF CONCRETE THAT PROJECTS 15 CM ABOVE GROUND DUE TO EROSION. LOCATED 30.0 M (98.4 FT) SOUTH FROM A TELEPHONE PEDESTAL, 27.7 M (90.9 FT) SOUTHWEST FROM AND 0.5 M (1.6 FT) LOWER THAN THE HIGHWAY CENTER, 14.4 M (47.2 FT) NORTHEAST FROM AND 1.5 M (4.9 FT) LOWER THAN THE NORTHEAST RAIL OF TRACK AND 0.4 M (1.3 FT) SOUTHEAST FROM A METAL WITNESS POST. DESCRIBED BY G.R. HEID.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in September 1992.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in November 1993.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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