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Details for Benchmark: DA1577

N 32° 45.088 W 112° 49.597 (NAD 83)

Altitude: 1039.1

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
BLACK
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:]
photoDA1577
photoDA1577 w GPSr
photoDA1577 Area

Recovered as described, in good condition.

[Photos:]
photoBLACK / DA1577
A close-up of the mark, with the GPSr.
photoBLACK / DA1577
A close-up of the mark alone.
photoBLACK / DA1577
A wide view of the general area, looking south from RM 1.
photoBLACK / DA1577
A close-up of RM 1.
photoBLACK / DA1577
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 14.9 MILES SOUTHWEST OF GILA BEND ALONG THE WEST RIGHT-OF-WAY OF STATE ROUTE 85. THE STATION IS AN ADOT HIGHWAY DIVISION DISK STAMPED BLACK P AND M GS 1975 AND IS SET IN A 10 INCH CONCRETE MONUMENT PROJECTING 0.3 FEET. THE MARK IS 175 FEET WEST OF THE CENTERLINE OF STATE ROUTE 85, 24 FEET EAST OF THE WEST RIGHT-OF-WAY FENCE LINE, 2.6 FEET EAST OF A WITNESS POST AND 26.2 FEET NORTHEAST OF UTILITY POLE 525. 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 IN THE WEST RIGHT-OF-WAY OF STATE HWY. 85, 24 FEET EAST OF RIGHT-OF-WAY FENCE, 42.3 FEET NORTH OF A WITNESS POST AND 176 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 LOCATED IN THE WEST RIGHT-OF-WAY OF STATE HWY. 85. THE MARK IS 25.2 FEET SOUTHEAST OF UTILITY POLE 525, 23 FEET EAST OF RIGHT-OF-WAY FENCE, 42 FEET SOUTH OF WITNESS POST AND 176 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. 80 FOR 0.91 MILES TO THE AJO-STATE ROUTE 85 TURNOFF. TURN RIGHT AND FOLLOW RAMP UNDER HWY. I-8 OVERPASS, CONTINUE SOUTHERLY ON STATE HWY. 85 TO MILE POST 15.15 (14.65 MILES) AND THE STATION IN THE WEST RIGHT-OF-WAY MARKED BY A WITNESS POST. 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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