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Details for Benchmark: GP0526

N 36° 41.846 W 111° 37.970 (NAD 83)

Altitude: 6657

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
JACK
Marker Type:
survey disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

Must Read!

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Showing wear and tear but hanging in.

Recovered in POOR condition. The disk is loose. It appears as though the freezing and thawing over the years has taken its toll on this one.

From highway 89 head west on a dirt road heading to the relay towers (recommend having a 4X4). Park near the towers and follow the path of least resistance taken by the water run-off. (head north around the first knoll and then head for the benchmark.

[Photos:]
photoJACK in northen AZ
photoJACK as seen from the truck
Mark is right below the arrow.
photoJACK route picking
Recovery team just above the arrow.
photoJACK recovery team
photoJACK recovery team close up
photoJACK view southeast
photoJACK view east
Arrow points to our truck.
photoJACK view northeast
photoJACK view north
photoJACK view west
photoJACK view southwest
Left arrow points to BITTER and right arrow points to SHINUMO, both triangulation stations.
photoJACK view to a sinkhole that is 300 feet deep
photoJack as seen from Hwy 89
photoJack from below - on Hwy 89 A
photoJack from below - on Hwy 89 A long shot
photoJack - very long close-up
photoJack very long shot

Documented History (by the NGS)

01/01/1954 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1954 LOCATED ABOUT 25 MI NNW. OF CEDAR RIDGE TRADING POST, 8 MI S. OF NAVAJO BRIDGE. ON NORTHERNMOST AND HIGHEST OF TWO PROMINENT TWIN CRAGS ON ECHO CLIFFS, DIRECTLY ABOVE HEAD OF JACKASS CREEK. REACHED BY HELICOPTER. THERE ARE SEVERAL TRACK RDS. ABOUT 2 MI E. OF STATION. THE ONLY ROUTE OF ASCENT IS UP STEEP CREVICE, PARTIALLY BLOCKED BY TWO TREES, WHICH SLOPES UP TO TOP FROM E. STATION MARK--STANDARD TABLET STAMPED---JACK 1954---, CEMENTED IN DRILL HOLE IN SOLID SANDSTONE TOP. RMS--NONE SET.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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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