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Details for Benchmark: CG1152

N 31° 57.771 W 110° 45.158 (NAD 83)

Altitude: 3434

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
GUARD
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Found easily, good condition.

[Photos:]
photoCG1152
N 31° 57.770 W 110° 45.160

Found in good shape, as described, though the mark has been painted white since the last log.

[Photos:]
photoCG1152

Located marker per description

[Photos:]
photoCG1152 GUARD marker

Found all three disks in very good condition.

[Photos:]
photoDisk 1
photoDisk 2
photoDisk3

The cattle guard mentioned in the description is no longer there.

Documented History (by the NGS)

01/01/1987 by AZDT (MONUMENTED)
DESCRIBED BY ARIZONA DEPARTMENT OF TRANSPORTATION 1987 (AT) THE STATION IS LOCATED 12 MILES EAST OF SAHUARITA, 5 MILES SOUTHWEST OF VAIL ALONG THE NORTH SIDE OF SAHUARITA ROAD. THE STATION MARK IS AN AZDT DISK STAMPED---GUARD 1987---. IT IS SET IN TOP OF A 10 INCH CONCRETE MONUMENT WHICH PROJECTS 4 INCHES. 98 FEET SOUTHEAST OF THE SOUTHEAST CORNER OF A CATTLE GUARD, 40 FEET SOUTH OF THE CENTER OF SAHUARITA ROAD AND 4 FEET NORTH OF THE WITNESS POST AND SIGN. REFERENCE MARK 1 IS AN AZDT DISK STAMPED---GUARD RM 1 1987---. IT IS SET IN TOP OF A 10 INCH CONCRETE MONUMENT. REFERENCE MARK 2 IS AN AZDT DISK STAMPED---GUARD RM 2 1987---. IT IS SET IN TOP OF A 10 INCH CONCRETE MONUMENT. TO REACH THE STATION FROM INTERSTATE HIGHWAY 10 AND HOUGHTON ROAD TRAFFIC INTERCHANGE 11 MILES EAST OF TUCSON. TRAVEL SOUTH ALONG HOUGHTON ROAD FOR 6.7 MILES TO SAHUARITA ROAD. TURN LEFT AND TRAVEL EAST ALONG SAHUARITA ROAD FOR 1.15 MILES TO A CATTLE GUARD AND THE STATION ON THE RIGHT.

Control Text

  • The horizontal coordinates were established by GPS observations 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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 X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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