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Details for Benchmark: GP0266

N 36° 41.200 W 111° 52.000 (NAD 83)

Altitude: 4842.39

Coordinates may not be exact. Altitude is POSTED and location is SCALED. (more info)

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
4850.71
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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N 36° 41.220 W 111° 52.032

Found this benchmark today in good condition.

[Photos:]
photoCloseup of the benchmark with GPS
photoWide view looking east
N 36° 41.219 W 111° 52.033

Survey Disk 4850.71 was recovered as described, in good condition. This mark is located at Milepost 555.1 of U.S. Highway 89A.

[Photos:]
photoGP0266 20060509 G (Coconino Co. AZ)
Survey Disk 4850.71 w/GPSr.
photoGP0266 20060509 C (Coconino Co. AZ)
Survey Disk 4850.71.
photoGP0266 20060509 B (Coconino Co. AZ)
Survey Disk 4850.71 from Eye Level.
photoGP0266 20060509 A1 W (Coconino Co. AZ)
West at Survey Disk 4850.71.
photoGP0266 20060509 A2 N (Coconino Co. AZ)
North at Survey Disk 4850.71.
photoGP0266 20060509 A3 N (Coconino Co. AZ)
North at Survey Disk 4850.71.
N 36° 41.221 W 111° 52.032

We got our 2nd FTR for the day! It is in good shape. John had to dig for this one.

[Photos:]
photo4850.71 along hwy 89A in Northern AZ.
photo4850.71 along hwy 89A in Northern AZ. w/GPSr
photo4850.71 looking down from road

Documented History (by the NGS)

01/01/1934 by AZHD (MONUMENTED)
DESCRIBED BY ARIZONA HIGHWAY DEPARTMENT (NOW AZDT) 1934 16.9 MI W FROM MARBLE CANYON. 16.9 MILES WEST ALONG U.S. HIGHWAY 89 FROM THE POST OFFICE AT MARBLE CANYON, COCONINO COUNTY, AT AN 8- BY 16-FOOT BOX CULVERT, AND IN THE CENTER OF THE TOP OF THE NORTH CONCRETE HEADWALL. AN ARIZONA STATE HIGHWAY DEPARTMENT STANDARD DISK, STAMPED 4850.71 913+28.0 1934.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in 1992. * This is a POSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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