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Details for Benchmark: DU0459

N 33° 29.000 W 111° 28.233 (NAD 83)

Altitude: 2160.67

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
W 21
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Hi! Nana18 signed me in for a benchmark challenge and so I figure that I should find a few. This was one of them.

[Photos:]
photoDU0459 W21

Benchmark hunting.

[Photos:]
photo
photo

Recovered in good condition at N 33 28.998 W 111 28.255.

[Photos:]
photoDU0459(W 21) - Maricopa County AZ
photoDU0459 - Eye level
photoDU0459 - Looking NE

Found this mark in good condition at coords given by previous log.

[Photos:]
photoDU0459_W21 (1)
photoDU0459_W21 (2)

Found it while doing some geocaching.

Found as described and in good condition....

Found on an amazing adventure along the Apache Trail

Found while cruising historic Route 88.

This entry was edited by chevyragtop on Monday, 07 March 2011 at 16:31:33.

Recovered in good condition.

[Photos:]
photoCloseup of the mark
photoThe mark with my GPSr
photoLooks west; mark in foreground

Found it in good shape..

[Photos:]
photoDU0459

Found today.

[Photos:]
photoDU0459

Recovered in good condition. Handheld GPSr indicated coordinates of N 33 28.998' W 111 28.255'.

[Photos:]
photoDU0459 W 21 closeup
photoDU0459 W 21 wide shot looking west

Recovered as described, in good condition.

[Photos:]
photoW 21 / DU0459
A close-up of the mark, with the GPSr.
photoW 21 / DU0459
A close-up of the mark alone.
photoW 21 / DU0459
A wide view of the general area, looking northeast.

Found in good condition and as described.

[Photos:]
photoW 21 - Pinal County, AZ
photoW 21 - Pinal County, AZ
photoW 21 - Pinal County, AZ

Found in good condition
33.28.000N 111.28.255W Alt 2144'

[Photos:]
photoDU0459.JPG

N33 29.001 W111 28.255 2141 ft... found in good condition as described.

[Photos:]
photoDU0459 bm.JPG
photoDU0459 bm gps.JPG
photoDU0459 looking north.JPG
photoDU0459 looking southeast.JPG

Do not wear sandals while looking at this benchmark, as we did. Easily found, one of several along this road.

N 33° 29.004 W 111° 28.253

Found this one in good condition as well. I had an elevation of 2162 ft.

Enclosed are pictues of marker and area.

[Photos:]
photoGPSr and Marker
photoWitness Post and Marker
photoView to the West
photoSuperstions to the SE

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
01/01/1948 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1948 6.6 MI NE FROM APACHE JUNCTION. ABOUT 6.6 MILES NORTHEAST ALONG STATE HIGHWAY NO. 88 FROM APACHE JUNCTION, ABOUT 1.0 MILE SOUTHWEST OF GOVERMENT WELL, 47.5 FEET NORTHWEST OF THE CENTER LINE OF THE HIGHWAY, 2.2 FEET NORTHEAST OF A WHITE WOODEN WITNESS POST, ABOUT 2 FEET ABOVE THE LEVEL OF THE HIGHWAY, SET IN THE TOP OF A CONCRETE POST PROJECTING 6 INCHES.
01/01/1980 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 10.8 KM (6.7 MI) NORTHEAST ALONG STATE HIGHWAY 88 FROM THE JUNCTION OF U.S. HIGHWAY 60 AT APACHE JUNCTION, 1.6 KM (1.0 MI) SOUTH OF THE GOVERNMENT WELL, 0.7 KM (0.45 MI) SOUTH OF HIGHWAY MILEPOST 203, AT AN ISLAND FORMED BY TWO FORKS OF A DIRT ROAD LEADING NORTHWEST, 14.5 METERS (47.5 FT) NORTHWEST OF THE CENTERLINE OF THE HIGHWAY, 9.2 METERS (30.0 FT) NORTHEAST OF THE CENTERLINE OF THE DIRT ROAD, 7.3 METERS (24.0 FT) SOUTH OF THE CENTERLINE OF THE NORTH FORK OF THE ROAD. THE MARK IS 0.3 METERS SE FROM A WITNESS POST. THE MARK IS 0.3 M ABOVE 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 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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