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Details for Benchmark: CG0979

N 31° 52.213 W 110° 16.977 (NAD 83)

Altitude: 4009

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

Location:
In COCHISE county, AZ View Original Datasheet
Designation:
JUAN
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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The triangulation station and two Reference Marks were found...

[Photos:]
photoA closeup of the Mark
photoJuan vicinity looking North
photoJuan RM1 closeup
photoJuan RM1 vicinity looking at the mark
photoJuan RM2 closeup
photoJuan RM2 vicinity looking toward the mark

Triangulation Station JUAN was recovered in good condition.

[Photos:]
photoCG0979 20060514 G (Cochise Co. AZ)
Triangulation Station JUAN w/GPSr.
photoCG0979 20060514 C (Cochise Co. AZ)
Triangulation Station JUAN.
photoCG0979 20060514 B (Cochise Co. AZ)
Triangulation Station JUAN from Eye Level.
photoCG0979 20060514 A1 S (Cochise Co. AZ)
South at Triangulation Station JUAN.
photoCG0979 20060514 A2 E (Cochise Co. AZ)
East at Triangulation Station JUAN.

Documented History (by the NGS)

01/01/1946 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (CAE) STATION IS LOCATED ABOUT 7 MILES, AIRLINE, SSE OF BENSON, ABOUT 4-1/2 MILES, AIRLINE, SW OF ST. DAVID, AND ABOUT 0.1 MILE NE OF THE SAN JUAN SIDING ON THE SOUTHERN PACIFIC RAILROAD. IT IS NOT A PROMINENT POINT, BUT IS ON THE HIGHEST POINT OF A FLAT ROLLING MESA. TO REACH THE STATION FROM ST. DAVID, PROCEED TOWARD BENSON ON U.S. HIGHWAY 80 FOR 1.4 MILES TO A PAVED ROAD LEADING TO THE LEFT AT A SIGN APACHE POWDER COMPANY. THIS IS AT THE W END OF A STEEL BRIDGE OVER THE SAN PEDRO RIVER AND JUST AFTER CROSSING A RAILROAD TRACK. TURN LEFT ON THE PAVED ROAD AND CONTINUE FOR 0.9 MILE TO A GRAVEL ROAD LEADING TO THE RIGHT. THIS IS JUST AFTER CROSSING A SMALL WOODEN BRIDGE. TURN RIGHT AND CONTINUE FOR 0.6 MILE TO A FORK, KEEP THE RIGHT FORK AND CONTINUE FOR 2.1 MILES TO THE STATION ON THE RIGHT. THIS IS ABOUT 0.1 MILE BEFORE REACHING A GATE ENTERING THE RAILROAD RIGHT-OF-WAY. THE STATION MARK IS A BRONZE STATION DISK, STAMPED JUAN 1946, AND SET IN A 10-INCH-SQUARE CONCRETE POST PROJECTING ABOUT 4 INCHES. IT IS ON THE HIGHEST POINT OF THE FLAT MESA, 81 FEET WNW OF THE CENTER OF THE ROAD, 250 FEET N OF THE S GATEPOST, AND 12.1 FEET S OF A WHITE WITNESS POST. UNDERGROUND MARK IS A BRONZE STATION DISK SET IN CONCRETE. REFERENCE MARK 1 IS A BRONZE REFERENCE DISK, STAMPED JUAN NO 1 1946, AND SET IN A CONCRETE POST 10 INCHES SQUARE PROJECTING ABOUT 3 INCHES. IT IS NE OF THE STATION AND ABOUT LEVEL WITH IT. REFERENCE MARK 2 IS A BRONZE REFERENCE DISK, STAMPED JUAN NO 2 1946, AND SET IN A CONCRETE POST 10 INCHES SQUARE PROJECTING ABOUT 1 INCH. IT IS NW OF THE STATION AND ABOUT LEVEL WITH IT. AZIMUTH MARK IS A BRONZE AZIMUTH DISK, STAMPED JUAN 1946, AND SET IN A 10-INCH-SQUARE CONCRETE POST ABOUT FLUSH WITH THE SURROUNDING GROUND. IT IS ABOUT 1/2 MILE SE OF THE STATION, 19.5 FEET ENE OF THE RIGHT-OF-WAY FENCE, AND 4.4 FEET ENE OF A WHITE WITNESS POST. TO REACH THE MARK FROM THE STATION, CONTINUE TO THE GATE AT THE ENTRANCE TO RIGHT-OF-WAY. AT THIS POINT TURN LEFT ON A TRACK LEADING S ALONG THE FENCE AND CONTINUE FOR 0.4 MILE TO THE MARK WHICH IS TO THE RIGHT OF THE ROAD, THAT IS, BETWEEN THE ROAD AND THE RIGHT-OF-WAY FENCE.
01/01/1986 by AZDT (GOOD)
RECOVERY NOTE BY ARIZONA DEPARTMENT OF TRANSPORTATION 1986 (ART) THE STATION MARK, REFERENCE MARKS AND THE AZIMUTH MARK WERE RECOVERED AS DESCRIBED IN 1946. A NEW ROUTE TO THE STATION FOLLOWS. TO REACH THE STATION FROM THE POST OFFICE IN ST. DAVID TRAVEL WEST AND NORTH ALONG U.S. HIGHWAY 80 FOR 2.0 MILES TO THE APACHE POWDER PLANT ROAD ON THE LEFT. TURN LEFT FOR 1.35 MILES TO AN OLD PAVED ROAD ON THE RIGHT. TURN RIGHT CROSSING A CATTLE GUARD AND TRAVEL 0.55 MILE TO A DIRT ROAD ON THE LEFT. TURN LEFT AND TRAVEL SOUTH FOR 2.95 MILE TO A GAS LINE CROSS ROAD, CONTINUE AHEAD FOR 0.05 MILE TO THE STATION ON THE RIGHT. TO REACH THE AZIMUTH MARK FROM THE STATION CONTINUE SOUTH FOR 0.1 MILE TO A ROAD FORK. TAKE THE LEFT FORK FOR 0.2 MILE TO THE MARK ON THE LEFT.

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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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