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Details for Benchmark: DA1556

N 32° 53.439 W 112° 44.939 (NAD 83)

Altitude: 830.4

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
GAF
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.

[Photos:]
photoDA1556
photoDA1556 w GPSr

Recovered as described, in good condition.

[Photos:]
photoGAF / DA1556
A close-up of the mark, with the GPSr.
photoGAF / DA1556
A close-up of the mark alone.
photoGAF / DA1556
A wide view of the general area, looking south from RM 1.
photoGAF / DA1556
A close-up of RM 1.
photoGAF / DA1556
A close-up of RM 2.

Documented History (by the NGS)

01/01/1975 by AZDT (MONUMENTED)
DESCRIBED BY ARIZONA DEPARTMENT OF TRANSPORTATION 1975 (TT) THE STATION IS LOCATED ABOUT 4 MILES WEST-SOUTHWEST OF GILA BEND ALONG THE WEST RIGHT-OF-WAY OF STATE ROUTE 85. THE STATION IS AN ADOT HIGHWAY DIVISION DISK STAMPED GAF P AND M GS 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT PROJECTING 0.3 FEET. THE STATION IS 94 FEET WEST OF THE CENTERLINE OF STATE ROUTE 85, 106 FEET EAST OF THE WEST RIGHT-OF-WAY FENCE AND MARKED BY A WITNESS POST 3 FEET TO THE WEST. REFERENCE MARK 1 IS AN ADOT HIGHWAY DIVISION DISK STAMPED RM 1 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT. THE MARK IS 106.5 FEET EAST OF RIGHT-OF-WAY FENCE, 43.3 FEET NORTH OF A WITNESS POST, 3.5 FEET EAST OF A LINE OF UTILITY POLES, 71 FEET SOUTH OF UNMARKED UTILITY POLE, AND 94 FEET WEST OF CENTERLINE OF STATE HWY. 85. REFERENCE MARK 2 IS AN ADOT HIGHWAY DIVISION DISK STAMPED RM 2 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT. THE MARK IS 105.5 FEET EAST OF A RIGHT-OF-WAY FENCE, 43.2 FEET SOUTH OF A WITNESS POST AND 94 FEET WEST OF CENTERLINE OF HWY. 85. TO REACH THE STATION FROM MARTIN AVE AND U.S. 80 IN GILA BEND, GO WEST 0.91 MILES TO THE AJO AND STATE ROUTE 85 TURNOFF, TURN RIGHT AND FOLLOW RAMP UNDER I-8 UNDERPASS AND CONTINUE SOUTHERLY ALONG STATE ROUTE 85 TO MILE POST 4.52 (4.0 MILES) AND STATION ON THE WEST RIGHT-OF-WAY. HEIGHT OF LIGHT ABOVE STATION MARK 1.5 METERS.

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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