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Details for Benchmark: DU1480

N 33° 24.600 W 111° 32.033 (NAD 83)

Altitude: 1753.79

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
1262 AC
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Found in good shape, as described.

[Photos:]
photoDU1480
photoDU1480 wGPSr

I blew it...I accepted the coordinates as being correct...since the other three on that knoll were quite accurate...so my GPSr was telling my that it was in the fenced yard just north of the knoll. I may go back, if I have the time.

Found it in good shape

[Photos:]
photoDU1480

Recovered as described, in good condition.

[Photos:]
photo1262 AC / DU1480
A close-up of the mark w/GPSr.
photo1262 AC / DU1480
A close-up of the mark alone.

Okay, this one was frustrating! We searched all around that blasted knoll. Finally after deciding to give up, there it was, right in front of us.

Found this benchmark shortly after logging in DU1317, a short distance away.

Bill & Jan

[Photos:]
photo1262AC

Documented History (by the NGS)

Unknown by AZDT (MONUMENTED)
01/01/1975 by AZDT (GOOD)
DESCRIBED BY ARIZONA DEPARTMENT OF TRANSPORTATION 1975 0.8 MI N FROM PALM SPRINGS. FROM MILEPOST 197, U.S. 60, 70, AND 80, WEST ON THE HIGHWAY FOR 0.1 MILES. RIGHT NORTH FOR 0.15 MILES TO THE EAST SIDE OF THE UNITED PRESBYTERIAN CHURCH. FROM THERE CONTINUE 0.05 MILES TO THE BASE OF A SMALL HILL. PACK TO THE WEST END OF THE HILL AND TO THE STATION. ABOUT 2/3 OF THE WAY TO THE TOP OF THE HILL. 50 FT. EAST OF THE WEST END OF THE HILL. AN AHD BRASS CAP, CEMENTED TO AN OUTCROPPING OF BEDROCK.
01/01/1984 by AZDT (GOOD)
RECOVERY NOTE BY ARIZONA DEPARTMENT OF TRANSPORTATION 1984 RECOVERED IN GOOD CONDITION. NEW DESCRIPTION FOLLOWS. 1.4 KM (0.9 MILE) SOUTHEAST ALONG U.S. HIGHWAY 60 FROM ITS JUNCTION WITH STATE HIGHWAY 88 AT APACHE JUNCTION. THENCE 0.3 KM (0.2 MILE) EAST ALONG BROADWAY RD. TO THE UNITED PRESBYTERIAN CHURCH, FROM THERE GO NORTH 0.08 KM. (0.05 MI.) TO THE BASE OF A SMALL HILL, PACK TO THE WEST END OF THE HILL AND TO THE STATION. ABOUT 2/3 OF THE WAY TO THE TOP OF THE HILL, 50 FEET EAST OF THE WEST END OF THE HILL. THE MARK IS AN AHD BRASS CAP, CEMENTED TO AN OUTCROPPING OF BEDROCK.

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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