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Details for Benchmark: GP0591

N 36° 25.999 W 111° 42.930 (NAD 83)

Altitude: 6520

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
SHINUMO
Marker Type:
triangulation station disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Recovered station and RMs in good condition. Did not find the Azimuth mark. (probably walked right over it).

Drove to the south end of Shinumo Altar and then drove cross country to the base of the butte. We passed 2 dwellings in the process before turning off the secondary trail.
From the base of the butte we glassed the slope for the best access to the top of the mesa and determined an area to the north of the station showed the most promise for ease of access (see pictures).

[Photos:]
photoSHINUMO west of Cedar Ridge, AZ.
photoSHINUMO & GPSr
photoSHINUMO RM 1
photoSHINUMO RM 2
photoSHINUMO looking south
photoSHINUMO looking east and down
The red circle is the station mark.
photoSHINUMO looking east and down to pickup
The red circle is the pickup.
photoSHINUMO Station looking north.
photoSHINUMO looking west
photoSHINUMO ascent route area
Red arrow is where the station is located. the green arrow is where we accessed the top of the mesa. The yellow arrow is where we descended.
photoStarting the ascent to SHINUMO.
photoSHINUMO descent area.
The start of the descent. The red circle is the pickup.
photoStarting the descent
photoThe descent looking at Andy and the pickup
photoSHINUMO's trail from about 1/3 of the way down
photoShinumo Altar west of Cedar Ridge, AZ
The arrow points to where the benchmark is located.

Documented History (by the NGS)

1/1/1903 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1903 LOCATED ABOUT 15 MI N. OF MOUTH OF LITTLE COLORADO RIVER, 7 MI E. OF COLORADO RIVER. ON HIGHEST POINT OF SOUTH END OF SHINUMO ALTAR, PROMINENT BALD MESA BUTTE. TO REACH FROM WILLOW SPRINGS, TAKE WAGON TO FOOT OF BUTTE. STATION MARK--STANDARD BRONZE TABLET, STAMPING UNKNOWN, CEMENTED IN LIMESTONE ROCK UNDER CENTER OF CAIRN 6 FT. HIGH AND 6 FT. IN DIAMETER. RMS--NONE SET.
1/1/1934 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1934 (CP) STATION IS LOCATED ON THE HIGHEST PART OF THE SOUTHEASTERN END OF SHINUMO ALTAR, A PROMINENT, BALD, FLAT-TOPPED BUTTE ABOUT 15 MILES NORTH OF THE MOUTH OF THE LITTLE COLORADO RIVER AND ABOUT 7 MILES EAST OF THE COLORADO RIVER. REACHED FROM THE CEDAR RIDGE TRADING POST ON U.S. HIGHWAY 89. GO WEST ON ROAD SOUTH OF TRADING POST AND FOLLOW THE MAIN-TRAVELED ROAD FOR 5.2 MILES PASSING TO NORTH OF TANK, THENCE ACROSS DAM AT NORTH END AND TURN RIGHT AT SOUTH END OF DAM AND FOLLOW MAIN-TRAVELED ROAD FOR 2.0 MILES, TAKE RIGHT FORK, FOLLOW ROAD TO FIRST CROSS ROAD, TAKE LEFT FORK AND CONTINUE FOR 5.3 MILES TO POINT OPPOSITE SOUTHERN BASE OF HILL, CAN TURN RIGHT HERE AND GO 0.2 MILE. CLIMB NORTH TO HIGHEST POINT OF HILL AND STATION. 15 MINUTES PACK. STATION MARK IS STANDARD U.S. GEOLOGICAL SURVEY MARK. AZIMUTH MARK 1/8 MILE NORTH-NORTHEAST ON SMALL ROCK LEDGE. REFERENCE MARKS NOS. 1 AND 2 ARE SET AS DESCRIBED.
1/1/1938 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (FGJ) ABOUT 27 MILES SOUTH OF THE MARBLE CANYON BRIDGE AND 8 MILES EAST OF THE COLORADO RIVER ON A LONE, PROMINENT, FLAT-TOPPED BUTTE KNOWN AS SHINUMO ALTAR. BUTTE IS ROCKY AND FAIRLY LEVEL ON TOP, STATION IS LOCATED ON THE SOUTHEAST END OF THE BUTTE. STATION MARK IS A STANDARD U.S. GEOLOGICAL SURVEY BENCH MARK (UNSTAMPED), SET IN OUTCROPPING BEDROCK. REFERENCE MARK NO. 1 IS NORTH-NORTHEAST OF STATION AND ABOUT 1 FOOT LOWER IN ELEVATION. REFERENCE MARK NO. 2, IS WEST-NORTHWEST OF STATION AND ABOUT 3 FEET LOWER IN ELEVATION. AZIMUTH MARK, IS NORTH-NORTHEAST OF THE STATION ON THE FIRST BLUFF NORTH OF THE STATION ON THE EAST SIDE OF BUTTE, APPROXIMATELY 250 METERS. STATION IS REACHED FROM CEDAR RIDGE TRADING POST BY GOING WEST ON DIRT ROAD, THE MAIN-TRAVELED ROAD, FOR 4.8 MILES TO A SMALL RESERVOIR ON THE LEFT. THENCE CONTINUE 2.1 MILES TO A FORK, TAKE RIGHT FORK AND FOLLOW THE MAIN-TRAVELED ROAD FOR 0.45 MILE TO CROSSROADS. THENCE TURN RIGHT AND GO 2.1 MILES TO A FORK, THENCE KEEP RIGHT FORK AND CONTINUE 1.25 MILES TO CROSS ROAD. THENCE CONTINUE STRAIGHT AHEAD TOWARD THE SOUTHWEST END OF THE BUTTE FOR 1.65 MILES, THENCE TURN RIGHT ACROSS COUNTRY FOR 0.15 MILE TO THE SOUTHEAST END OF BUTTE AND THE END OF TRUCK TRAVEL. FROM HERE PACK NORTH UP THE SLOPE TO THE HIGHEST POINT AND THE STATION SITE.
1/1/1953 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (LGT) THE STATION WAS RECOVERED AND ALL MARKS WERE FOUND IN GOOD CONDITION. THE PREVIOUS DESCRIPTION WAS FOUND TO BE ADEQUATE, BUT SOME DIFFERENCES IN DETAIL WERE NOTED. A COMPLETE NEW DESCRIPTION IS AS FOLLOWS-- THE STATION IS ABOUT 27 MILES SOUTH OF THE MARBLE CANYON BRIDGE AND 8 MILES EAST OF THE COLORADO RIVER, ON A LONE, PROMINENT, FLAT-TOPPED BUTTE KNOWN AS SHINUMOS ALTAR. THE BUTTE IS THE ONLY ONE IN THE VICINITY AND THE STATION IS ON THE HIGHEST POINT AT THE EXTREME SOUTHEAST END OF IT. TO REACH THE STATION FROM CEDAR RIDGE TRADING POST ON U.S. HIGHWAY 89 GO WEST ON THE DIRT ROAD LEADING PAST THE SOUTH SIDE OF THE STORE FOR 4.8 MILES TO AN EARTH RESERVOIR (LOOPS OF THE ROAD PASS TO THE RIGHT OR LEFT OF IT). CONTINUE WEST ON THE MAIN ROAD FOR 2.0 MILES TO A FORK. TAKE THE RIGHT FORK AND CONTINUE NORTHWEST, TOWARD THE BUTTE, FOR 4.5 MILES. THENCE BEAR RIGHT, ACROSS COUNTRY, FOR 0.15 MILE TO THE SOUTHWEST BASE OF THE BUTTE AND THE END OF TRUCK TRAVEL. FROM HERE PACK NORTH UP THE STEEP SLOPE TO THE TOP OF THE RIM AND THE STATION, ABOUT A 30-MINUTE PACK. THE STATION MARK IS A STANDARD U.S. GEOLOGICAL SURVEY BENCH MARK (UNSTAMPED) SET IN A 1-FOOT BY 2-FOOT BOULDER PROJECTING 2 INCHES ABOVE THE GROUND. IT IS NOT SET IN BEDROCK AS PREVIOUSLY STATED. IT IS 6 FEET NORTHEAST OF A 4-FOOT CAIRN. REFERENCE MARK 1 IS STAMPED SHINUMO NO 1 1934. IT IS SET IN BEDROCK FLUSH WITH THE SURFACE AND IS 18 INCHES LOWER THAN THE STATION MARK. IT IS A STANDARD USC AND GS DISK. REFERENCE MARK 2 IS STAMPED SHINUMO NO 2 1934. IT IS A STANDARD USC AND GS DISK SET IN BEDROCK FLUSH WITH THE SURFACE. IT IS ON THE WEST SLOPE OF THE RIDGE AND 3 FEET LOWER THAN THE STATION MARK. THE AZIMUTH MARK IS STAMPED SHINUMO NO 3 1934. IT IS A STANDARD USC AND GS REFERENCE DISK SET IN BEDROCK 1 FOOT NORTHEAST OF THE RIM OF A 2 FOOT LEDGE. IT IS ON THE SUMMIT OF THE NEXT RISE TO THE NORTH AND IS ACROSS A SHALLOW DRAW FROM THE STATION.
1/1/1953 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1953 RECOVERED IN GOOD CONDITION.
1/1/1972 by AZHD (GOOD)
RECOVERY NOTE BY ARIZONA HIGHWAY DEPARTMENT (NOW AZDT) 1972 GENERAL LOCATION ABOUT 15 MILES N OF THE MOUTH OF THE LITTLE COLORADO RIVER AND ABOUT 7 MILES E OF THE COLORADO RIVER. TO REACH AS PER USC AND GS DESCRIPTIONS AND RECOVERY NOTES. STATION MARK STD USGS BC SET IN BEDROCK UNSTAMPED. REFERENCE MARKS STD USC AND GS BCS SET IN BEDROCK COND GOOD. AZIMUTH MARK NOT OBSERVED.
1/1/1983 by AZDT (GOOD)
RECOVERY NOTE BY ARIZONA DEPARTMENT OF TRANSPORTATION 1983 (GH) THE STATION MARK, REFERENCE MARKS AND THE AZMUTH MARK WERE RECOVERED IN GOOD CONDITION. THE AZIMUTH MARK WAS SEARCHED FOR AND MISSED BY THE OBSERVING UNIT. A NEW ROUTE TO THE STATION FOLLOWS. TO REACH THE STATION FROM PAGE TRAVEL SOUTH ALONG U.S. HIGHWAY 89 FOR 43.0 MILES TO THE CEDAR RIDGE TRADING POST. TURN RIGHT ALONG INDIAN ROUTE 6110 AND TRAVEL WEST FOR 5.15 MILES TO A STOCK TANK ON THE LEFT. TRAVEL WEST FOR 1.95 MILES TO A FORK, TAKE THE RIGHT FORK FOR 0.6 MILE TO ANOTHER STOCK TANK ON THE RIGHT, CONTINUE WEST ALONG THE MAIN ROAD FOR 5.1 MILES TO A ROCK OUTCROP ON THE RIGHT NEAR THE ROAD. CONTINUE AHEAD SLOWLY ABOUT 0.1 MILE TO A SET OF DIM TRACKS ON THE RIGHT. TURN RIGHT TOWARD THE BUTTE FOR 0.3 MILE TO END OF TRUCK TRAVEL. PACK UP THE STEEP SLOPE TO THE RIM AND THEN AHEAD FOR ABOUT 100 YARDS TO A SLIGHTLY HIGHER OUTCROP AND THE STATION.

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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