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Details for Benchmark: DA1530

N 32° 27.558 W 112° 52.355 (NAD 83)

Altitude: 1418.6

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
MEAD
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:]
photoDA1530
photoDA1530 w GPSr
photoDA1530 Area

Recovered as described, in good condition.

[Photos:]
photoMEAD / DA1530
A close-up of the mark, with the GPSr.
photoMEAD / DA1530
A close-up of the mark alone.
photoMEAD / DA1530
A close-up of RM 1.
photoMEAD / DA1530
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 34.9 MILES SOUTHWEST OF GILA BEND AND 6 MILES WEST-NORTHWEST OF AJO ALONG THE EAST RIGHT-OF-WAY OF STATE ROUTE 85. THE STATION IS AN ADOT HIGHWAY DIVISION DISK STAMPED MEAD P AND M GS 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT. THE MARK IS 0.45 MILES SOUTH OF MEAD RD., 61 FEET EAST OF STATE HWY. 85 CENTERLINE, 37.5 FEET WEST OF THE EAST RIGHT-OF-WAY FENCE, 3.1 FEET EAST OF A WITNESS POST, AND 62 FEET EAST OF HWY. CENTERLINE. REFERENCE MARK 1 IS AN ADOT HIGHWAY DIVISION DISK STAMPED RM 1 1975 AND IS SET IN A 10 INCH CONCRETE POST IN THE EAST RIGHT-OF-WAY OF STATE HWY. 85. THE MARK IS 74 FEET EAST OF HWY CENTERLINE, 41 FEET NORTH-NORTHEAST OF A WITNESS POST AND 26 FEET WEST OF EAST RIGHT-OF-WAY FENCE LINE. REFERENCE MARK 2 IS AN ADOT HIGHWAY DIVISION DISK STAMPED RM 2 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT IN THE EAST RIGHT-OF-WAY OF STATE HWY. 85, 97 FEET EAST OF HWY. CENTERLINE, 36-1/2 FEET SOUTHEAST OF A WITNESS POST AND 2 FEET WEST OF EAST RIGHT-OF-WAY FENCE LINE. 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 THE I-8 OVERPASS, CONTINUE SOUTHERLY ON STATE HWY. 85 TO MILE POST 35.8 (35.3 MILES) AND STATION IN THE EAST 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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