Skip to content

Details for Benchmark: CG1052

N 31° 41.768 W 110° 50.885 (NAD 83)

Altitude: 9451

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

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

Reference Points

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

BALDY had some historical significance, as it was one of 13 principal triangulation stations in Arizona used by the USC&GS to observe the Texas-California Arc of Primary Triangulation, which was the first major triangulation surveying performed in Arizona. BALDY had been set by the USGS previously, and was occupied by the C&GS for observations on October 16 and 17, 1910. The other principal stations observed from BALDY were CZ1860 CATALINA (Mount Lemmon), CY1235 GRAHAM (Mt. Graham), CF0328 CHIRICAHUA (Flys Peak), DA1442 TABLE (Table Top Mountain), and DU2086 SUPERSTITION (122.5 miles (!) NNW near Apache Junction). BALDY was also used to observe several points to the south, which allowed the C&GS to tie in to previously performed surveys of the international border.

I searched today not for the station itself, which was destroyed when the Lookout Cabin built on its location, but for the original reference mark, a chiseled cross. I had calculated coordinates for it of 31° 41.775' N, 110° 50.877' W, roughly 60 feet northeast of the Lookout foundation. There I was able to spot first some chiseled lettering on the side of a rock, with an arrow pointing towards the top. Closer examination of the lettering revealed "RP" (reference point), and below that, "USGS" (the first S is backwards). And above the point of the arrow on the top of the rock, the rough chiseled cross!

[This entry was edited by southpawaz on Saturday, November 28, 2009 at 1:51:56 PM.]

[Photos:]
photoCG1052 BALDY RM chiseled cross
photoCG1052 BALDY RM Chiseled lettering RP USGS
photoCG1052 BALDY RM chiseled lettering and arrow
pointing to cross on top of the rock
photoCG1052 BALDY RM view SW to Lookout foundation

Sadly, this benchmark has gone missing.

[Photos:]
photoWhere have all the benchmarks gone?

A perfect hiking day with Sonorion!

[Photos:]
photoPhoto of benchmark

I've looked at the pictures posted for benchmark 'BALDY 2' and compared them to the picture I took (see attached). I've convinced myself that the benchmark I found is really 'BALDY' and not 'BALDY 2'. The rock it is set in is different and you can just about make out the marks "NO-1" instead of "NO-2" underneath the arrow.

[Photos:]
photobenchmark 'BALDY' on Mt Wrightson

Documented History (by the NGS)

01/01/1910 by USGS (MONUMENTED)
01/01/1935 by USGS (MARK NOT FOUND)
DESCRIBED BY US GEOLOGICAL SURVEY 1935 ON OLD BALDY OR SANTA RITA PEAK, A HIGH PROMINENT PEAK NEAR THE SOUTH END OF THE SANTA RITA RANGE, 11 MILES NORTHWEST OF CRITTENDEN AND 12 MILES NORTHWEST OF PATAGONIA, TOWNS ON THE SOUTHERN PACIFIC RAILROAD. STATION IS MARKED BY A U.S. GEOLOGICAL SURVEY TRIANGULATION STATION MARK CEMENTED INTO THE SOLID ROCK. THE REFERENCE MARK, WHICH IS IDENTICAL WITH THE U.S. GEOLOGICAL SURVEY REFERENCE MARK, IS A CROSS CUT IN THE TOP OF A ROCK AND 18.22 METERS (59.8 FEET) FROM THE STATION N 40 DEG 53 MIN E. THIS STATION WAS REPORTED LOST IN 1935, A LOOKOUT HOUSE HAVING BEEN BUILT OVER THE MARK.

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.

Advertising with Us