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Details for Benchmark: DA1466

N 32° 59.463 W 112° 29.851 (NAD 83)

Altitude: 1592.2

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

Location:
In MARICOPA county, AZ View Original Datasheet
Designation:
OCAPOS
Marker Type:
triangulation station disk
Setting:
in rock outcrop
Stability:

Reference Points

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Recovered as described, in good condition. After visiting this site, one can see why this location was chosen for the mark. Although the hill is not so high, it has a commanding view of most of the valley, in all directions.

[Photos:]
photoOCAPOS / DA1466
A close-up of the mark, with the GPSr.
photoOCAPOS / DA1466
A close-up of the mark alone.
photoOCAPOS / DA1466
Looking generally east from the Station Mark.
photoOCAPOS / DA1466
Looking generally north from the Station Mark.
photoOCAPOS / DA1466
Looking generally south from the Station Mark.
photoOCAPOS / DA1466
The view generally to the west.
photoOCAPOS / DA1466
A close-up of RM 1.
photoOCAPOS / DA1466
A close-up of RM 2.

Documented History (by the NGS)

01/01/1936 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1936 (JB) ON THE SUMMIT OF A LOW, ROCKY HILL LYING IN THE PASS JUST SOUTH OF THE ESTRELLA RANGE, 50 MILES WEST-NORTHWEST OF CASA GRANDE, 12 MILES EAST-NORTHEAST OF GILA BEND, 5 MILES WEST OF THE SOUTHERN PACIFIC RAILROAD STATION AT ESTRELLA, THREE-FOURTHS MILE EAST OF THE ABANDONED RAILROAD CAMP OCAPOS, IN THE CENTER OF THE ROUNDED SUMMIT OF THE SMALL, DETACHED HILL, ON ITS HIGHEST POINT. MARKED BY A STANDARD BRONZE DISK. REFERENCE MARK NO. 1, A STANDARD BRONZE REFERENCE DISK, ON THE CREST OF THE SUMMIT, IS 5.515 METERS (18.09 FEET) FROM STATION. REFERENCE MARK NO. 2, A STANDARD BRONZE REFERENCE DISK, AT THE WEST EDGE OF THE SUMMIT, ON THE RIDGE LINE, IS 9.352 METERS (30.68 FEET) FROM STATION. THE AZIMUTH MARK, A STANDARD BRONZE DISK, IS ON THE CASA GRANDE HIGHWAY, 25 YARDS EAST OF THE GRADE CROSSING OF THE SOUTHERN PACIFIC RAILROAD, 23 FEET NORTH OF THE CENTER OF THE HIGHWAY, 4 FEET SOUTHWEST OF A TELEPHONE POLE, AND IS 0.3 MILE FROM STATION N 13 DEG 20 MIN W.
01/01/1944 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944 (JM) STATION RECOVERED. A REVISED DESCRIPTION FOLLOWS-- REACHED FROM GILA BEND BY GOING E ON HIGHWAY 84 TO THE APPROACH OF AN OVERPASS ABOUT A MILE FROM THE CENTER OF TOWN. THERE TAKE A GRAVEL ROAD TO THE LEFT AS THE HIGHWAY TURNS RIGHT, AND GO 12.6 MILES TO WHERE THE RAILROAD CROSSES THE ROAD. OCAPOS IS IN THE CENTER OF THE ROUNDED SUMMIT OF THE SMALL DETATCHED HILL, ON ITS HIGHEST POINT.
01/01/1949 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949 (TCC) STATION IS 5.1 MILES W ALONG THE SOUTHERN PACIFIC CO. RAILROAD FROM THE STATION AT ESTRELLA, THENCE 0.3 MILE SE OF BRIDGE 869.67, ON THE SUMMIT OF A LOW ROCKY HILL, AND ON ITS HIGHEST POINT. STATION MARK IS A BRONZE STATION DISK SET IN THE TOP OF OUTCROPPING BEDROCK FLUSH WITH THE GROUND. REFERENCE MARK 1 IS A BRONZE REFERENCE DISK STAMPED OCAPOS NO 1 1936 AND IS 18 FEET SE OF THE STATION. IT IS SET IN THE TOP OF OUTCROPPING BEDROCK PROJECTING ABOUT 0.5 FOOT ABOVE THE GROUND. REFERENCE MARK 2 IS A BRONZE REFERENCE DISK SET IN THE TOP OF OUTCROPPING BEDROCK PROJECTING ABOUT 1 FOOT ABOVE GROUND. IT IS STAMPED OCAPOS NO 2 1936 AND IS 31 FEET N OF THE STATION.
01/01/1958 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (LFV) STATION AND REFERENCE MARKS RECOVERED IN GOOD CONDITION. AZIMUTH MARK WAS NOT SEARCHED FOR. DESCRIPTION BY T.C.C. IN 1948 ADEQUATE AND CORRECT.
01/01/1960 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (WWH) THE STATION, REFERENCE, AND AZIMUTH MARK WERE RECOVERED AND FOUND TO BE IN GOOD CONDITION. THE STATION WAS NOT OCCUPIED AT THIS DATE. A COMPLETE DESCRIPTION FOLLOWS. THE STATION IS ON THE HIGHEST POINT OF A LOW ROCKY HILL, 12 MILES EAST OF GILA BEND, 5 MILES WEST OF ESTRELLA ON THE SOUTHERN PACIFIC RAILROAD AND 0.3 MILE SOUTHEAST OF RAILROAD BRIDGE NO. 869.67. TO REACH FROM THE JUNCTION OF U.S. HIGHWAY 80 AND STATE HIGHWAY 84, 1.0 MILE EAST OF GILA BEND, GO EAST ON U.S. HIGHWAY 80 ABOUT 75 YARDS TO A SIDE ROAD RIGHT. TURN RIGHT, SOUTH AND EAST, PER SIGN MARICOPA ON GRAVEL ROAD ALONG THE NORTH SIDE OF THE SOUTHERN PACIFIC RAILROAD AND GO 12.2 MILES TO A RAILROAD GRADE CROSSING, 0.6 MILE EAST OF RAILROAD MILE POST 869. TURN RIGHT, CROSS TRACKS, AND GO 0.05 MILE TO END OF TRUCK TRAVEL AT ANOTHER SET OF RAILROAD TRACKS. PACK SOUTHEAST ACROSS FLAT LAND AND UP ROCKY RIDGE TO THE HIGHEST POINT AND THE STATION. A 30 MINUTE PACK. THE STATION MARK, STAMPED OCAPOS 1936, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN BEDROCK FLUSH WITH THE GROUND AND 39 FEET SOUTHEAST OF A 15 FOOT CACTUS. REFERENCE MARK NO. 1, STAMPED OCAPOS NO 1 1936, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN BEDROCK PROJECTING 4 INCHES AND ABOUT 6 INCHES LOWER THAN THE STATION. REFERENCE MARK NO. 2, STAMPED OCAPOS NO 2 1936, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A BOULDER PROJECTING 1-1/2 FOOT AND ABOUT 6 INCHES LOWER THAN THE STATION. THE AZIMUTH MARK, STAMPED OCAPOS 1936, IS A STANDARD DISK SET IN A SQUARE CONCRETE POST FLUSH WITH THE GROUND, 64-1/2 FEET EAST AND 21-1/2 FEET NORTH OF A RAILROAD GRADE CROSSING, 63 FEET EAST OF THE EAST RAIL OF THE RAILROAD, 57-1/2 FEET SOUTHEAST OF A TELEPHONE POLE, 3 FEET LOWER THAN THE ROAD AND SOUTHEAST OF RAILROAD BRIDGE NO. 869.67.
01/01/1972 by AZHD (GOOD)
RECOVERY NOTE BY ARIZONA HIGHWAY DEPARTMENT (NOW AZDT) 1972 GENERAL LOCATION GILA BEND - PHOENIX TO CASA GRANDE TO REACH AS PER USC AND GS DESCRIPTION AND RECOVERY NOTES STATION MARK STD. USC AND GS B.C. REFERENCE MARKS GOOD

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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