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Details for Benchmark: GP0152

N 36° 07.800 W 111° 14.283 (NAD 83)

Altitude: 4940.18

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
L 50
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found it today at 8:28a.

[Photos:]
photoL 50

No change in structure.

[Photos:]
photoGP0152 L 50 1934
photoGP0152 NNW

Found as described. The building is in ruins.

[Photos:]
photoL 50 at Tuba City's old school house in AZ.
photoL 50 With GPSr
photoThe Tuba City's old school house step/GPSr

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 IN TUBA CITY. AT TUBA CITY, COCONINO COUNTY, ON THE TONALEA-TUBA CITY ROAD, AT THE FRONT ENTRANCE TO THE PUBLIC SCHOOL, 75 FEET NORTH OF THE CENTERLINE OF THE ROAD, IN THE TOP OF THE BOTTOM CONCRETE STEP OF THE SCHOOL, AND 6 INCHES FROM THE EAST EDGE. A STANDARD DISK, STAMPED L 50 1934. NOTE-- TUBA CITY POST OFFICE. 0.5 MILE NORTHWEST OF ALONG MAIN STREET, THENCE 1 BLOCK EAST, AT THE FRONT ENTRANCE OF A PRIVATE BUILDING FORMERLY USED AS A SCHOOL, 75 FT. NORTH OF THE CENTERLINE OF THE STREET. 17 FT. SOUTH AND 17 FT. WEST OF THE SOUTHEAST CORNER OF THE BUILDING IN THE TOP OF THE BOTTOM CONCRETE STEP AND 6 INCHES FROM THE EAST EDGE. A USC AND GS BENCH MARK STAMPED L 50 1934.
1/1/1983 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS. 1.6 KM (1.0 MI) NORTHWEST ALONG STATE HIGHWAY 264 FROM ITS JUNCTION WITH U.S. HIGHWAY 160 IN TUBA CITY, THENCE 0.2 KM (0.1 MI) EAST ALONG A PAVED STREET, IN THE EAST END OF THE BOTTOM STEP OF THE SOUTH ENTRANCE TO THE TUBA CITY SUB-STATION OF THE NAVAJO POLICE (THE OLD TUBA CITY SCHOOL BUILDING), 22.9 METERS (75.1 FT) NORTH OF THE CENTERLINE OF THE STREET, 8.0 METERS (26.2 FT) SOUTHWEST OF THE SOUTHEAST CORNER OF THE BUILDING, AND 5.2 METERS (17.1 FT) SOUTH OF THE CENTER OF THE ENTRANCE. THE MARK IS 1.3 M ABOVE THE STREET.

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 June 1991. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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