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Details for Benchmark: DA1442

N 32° 45.200 W 112° 07.520 (NAD 83)

Altitude: 4376

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
TABLE
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

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Had a great hike up Tabletop today. Thanks Southpawaz for the history lesson. I saw 3 markers, did not realize there are 4 up here.

Recovered station TABLE, along with RM E (chiseled cross), RM NNW (1936), and RM 2 (1960 eccentric), all in good condition.

As a side note, TABLE has some historical significance, as one of the principal stations set during the 1908-1911 Texas-California arc of primary triangulation. This was the first major triangulation surveying done by the USC&GS in Arizona, making this one of the oldest triangulation stations set by the USC&GS in Arizona. The section across Arizona was surveyed in 1910-11, and stretched from Deming, NM to stations in California near Yuma and Needles, and also tied in to previous surveys of the southern border near Nogales and Yuma. Eleven of the principal stations in Arizona were newly set by the USCG&S, and the two other stations used were set previously by the USGS. Of these thirteen stations, fewer than six remain intact as originally set. Note that the surface of the station disk is flat, rather than domed. This style of disk was in use until circa 1920, when the USCG&S switched to domed disks.

[This entry was edited by southpawaz on Thursday, November 12, 2009 at 1:42:21 PM.]

[Photos:]
photoDA1442 TABLE closeup
photoDA1442 TABLE wide view looking north
photoDA1442 TABLE RM E (chiseled cross)
photoDA1442 TABLE RM E view to station
photoDA1442 TABLE RM NNW (1936)
photoDA1442 TABLE RM 2 (1960 eccentric)

I was so glad to have made it to the top, that all I could think of was getting back down. So, I jumped on ths "benchmark", only to now realize that it was a reference point disk. I just didn't pay attention. So, I'm sure we stood on the triangulation disk, but didn't record it.

[Photos:]
photoRef
photoRef with GPSr

Found this Benchmark while hiking on Tabletop with very good friends.

We did not find the second reference station, but we did find one of them as well as this triangulation point.

[Photos:]
photoStation

Found this one while geocaching on Table Top mountain. Still in good shape.

Found all three marks in great condition.

-Wily Javelina

[Photos:]
photoTriangulation Station (DA1442)
photoReference Mark
photoReference Mark #2
N 32° 45.228 W 112° 07.513

I found this on the summit of Table Top Mountain, near my Table Top Mountain geocache which on placed on this day. The above coordinates are for the cache.

[Photos:]
photoBenchmark photograph
Photo by geocacher n4/c (http://www.geocaching.com/profile/default.asp?A=7594), taken Feb. 2, 2002.

Documented History (by the NGS)

01/01/1910 by CGS (MONUMENTED)
01/01/1921 by USGS (GOOD)
DESCRIBED BY US GEOLOGICAL SURVEY 1921 RECOVERED IN GOOD CONDITION. NOTE--CAIRN 10 FT HIGH WAS BUILT OVER DISK.
01/01/1936 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1936 ON THE HIGHEST POINT WHICH IS THE NORTHWEST END, OF THE NORTHEAST KNOB OF TABLE TOP MOUNTAIN, ABOUT 24-1/2 MILES WESTSOUTHWEST OF CASA GRANDE AND ABOUT 8 MILES SOUTH OF STATE HIGHWAY NO. 84. MARKED BY A STANDARD BRONZE DISK. THE REFERENCE MARK, A STANDARD BRONZE REFERENCE DISK, IS 7.897 METERS (25.91 FEET) FROM STATION N 08 DEG 47 MIN W. A CROSS CUT IN THE TOP OF A LARGE FLAT ROCK IS 3.80 METERS (12.5 FEET) FROM STATION N 85 DEG 46 MIN E.
01/01/1960 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (NES) STATION WAS RECOVERED AND THE STATION MARK AND REFERENCE MARK 1 WERE FOUND IN GOOD CONDITION. THE ORIGINAL DESCRIPTION IS ADEQUATE. REFERENCE MARK 2 WAS ESTABLISHED AND OCCUPIED AS AN ECCENTRIC POINT IN ORDER TO SEE OVER THE RIM OF THE MOUNTAIN TO ROAD STATIONS LIN AND CREST. A NEW DESCRIPTION TO REACH THE STATION FOLLOWS-- REACHED FROM THE POST OFFICE IN STANFIELD BY GOING WESTERLY ON STATE HIGHWAY 84, FOR 16.8 MILES TO THE VEKOL OVERPASS, LEAVE HIGHWAY 84, CROSSING ON THE OVERPASS, AND FOLLOW GRADED ROAD SOUTHERLY FOR 2.0 MILES TO FORKS, TAKE LEFT FORK SOUTHEAST FOR 0.8 MILE TO A CONCRETE BLOCK HOUSE ON THE LEFT, CONTINUE SOUTHEASTERLY ON GRADED ROAD FOR 1.4 MILES TO FORKS, TAKE RIGHT FORK, SOUTHEAST, FOR 4.5 MILES TO END OF TRUCK TRAVEL JUST AFTER PASSING OLD SHED ON THE RIGHT, FROM END OF TRUCK TRAVEL PACK SOUTHERLY UP CANYON, KEEPING TO THE LEFT OF DEEP WASH, FOR ABOUT 3/4 MILE TO WHERE CANYON FORKS, KEEP TO THE LEFT UP TO A SADDLE FROM WHICH THE STATION HILL IS VISIBLE (THE HIGHEST AND LEFT ONE OF TWO PEAKS TO THE SOUTHEAST), FROM HERE PACK SOUTHEASTERLY TO HIGHEST PART OF HILL AND STATION. THE STATION MARK IS SET IN A MASS OF CONCRETE ABOUT 1 FOOT BELOW THE GROUND SURFACE AND IS SURROUNDED BY A ROCK WALL ABOUT 2 FEET HIGH. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED TABLE NO 2 1960, CEMENTED IN A DRILL HOLE IN A LARGE BOULDER ABOUT 6 FEET LONG AND 3 FEET WIDE AND PROJECTING 1-1/2 FEET. IT IS 59.631 METERS OR (195.66 FT) NORTH-NORTHWEST OF THE STATION. NO OBSERVATIONS WERE MADE FROM THE TRUE STATION AT THIS DATE.

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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