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Details for Benchmark: DA1542

N 32° 29.466 W 112° 52.915 (NAD 83)

Altitude: 1341.9

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
CORNEZ
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:]
photoDA1542
photoDA1542 w GPSr
photoDA1542 Area

Recovered as described, in good condition.

[Photos:]
photoCORNEZ / DA1542
A close-up of the mark, with the GPSr.
photoCORNEZ / DA1542
A close-up of the mark alone.
photoCORNEZ / DA1542
A wide view of the general area, looking north from RM 1.
photoCORNEZ / DA1542
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 32.7 MILES SOUTHWEST OF GILA BEND AND 8.2 MILES WEST-NORTHWEST OF AJO ALONG THE WEST RIGHT-OF-WAY OF STATE HWY. 85. THE STATION IS AN ADOT HIGHWAY DIVISION DISK STAMPED CORNEZ P AND M GS 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT. THE STATION IS 97 FEET WEST OF THE CENTERLINE STATE HWY. 85, 2.2 FEET EAST OF THE WEST RIGHT-OF-WAY FENCE AND 2.3 FEET WEST OF A WITNESS POST. 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 43-1/2 FEET SOUTH OF A WITNESS POST, 2 FEET EAST OF THE WEST RIGHT-OF-WAY FENCE LINE AND 97 FEET WEST OF HWY. CENTERLINE. 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 42-1/2 FEET NORTH OF A WITNESS POST, 2-1/2 FEET EAST OF WEST RIGHT-OF-WAY FENCE LINE AND 97 FEET WEST OF HWY. CENTERLINE. TO REACH THE STATION FROM MARTIN AVE. AND U.S. HWY. 80 IN GILA BEND, GO WEST ON U.S. HWY. 80 FOR 0.91 MILES TO THE AJO-STATE ROUTE 85 TURNOFF. TURN RIGHT AND FOLLOW RAMP UNDER I-8 OVERPASS, CONTINUE SOUTHERLY ON STATE ROUTE 85 TO MILE POST 33.55 (33.05 MILES) AND STATION IN THE WEST RIGHT-OF-WAY. HEIGHT OF LIGHT ABOVE STATION MARK 1.5 METERS.
02/16/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 RECOVERED IN GOOD CONDITION.

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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