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Details for Benchmark: GP0149

N 36° 08.367 W 111° 09.583 (NAD 83)

Altitude: 5122.7

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
H 50
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered in good condition as described in the 1983 log.

[Photos:]
photoH 50 along hwy 160 on Navajo Reservation AZ
photoH 50 Looking SW towards Mt.s at Flagstaff, AZ

Documented History (by the NGS)

1/1/1934 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1934 5.0 MI NE FROM TUBA CITY. 5.0 MILES NORTHEAST ALONG THE OLD TONALEA ROAD FROM TUBA CITY, COCONINO COUNTY, 4-1/2 POLES SOUTHWEST OF AN ANGLE IN A ROW OF POLES, 90 FEET NORTH OF THE CENTERLINE OF THE ROAD, AND IN LINE WITH THE ROW OF POLES. A STANDARD DISK, STAMPED H 50 1934 AND SET IN THE TOP OF A CONCRETE POST. NOTE-- TUBA CITY, JUNCTION OF U.S. HIGHWAY 164 AND STATE HIGHWAY 264. 3.6 MILES NORTHEAST OF ALONG U.S. HIGHWAY 164. THENCE 0.35 MILE EAST ON SIDE ROAD. 4 1/2 POLES SOUTHWEST OF AN ANGLE IN A ROW OF POLES. 80 FT. NORTH OF THE CENTERLINE OF THE ROAD, AND IN LINE WITH THE ROW OF POLES. SET IN A CONCRETE POST PROJECTING 0.6 FT. A USC AND GS BENCH MARK STAMPED H 50 1934.
1/1/1983 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN GOOD CONDITION. A NEW DESCRIPTION FOLLOWS. 6.7 KM (4.15 MI) NORTHEASTERLY ALONG U.S. HIGHWAY 160 FROM ITS JUNCTION WITH STATE HIGHWAY 264 IN TUBA CITY, 0.1 KM (0.05 MI) SOUTHWEST OF MILEPOST 326, 144.8 METERS (475.0 FT) SOUTHEAST OF THE CENTERLINE OF THE HIGHWAY, 43.9 METERS (144.0 FT) EAST OF A UTILITY POLE, 24.4 METERS (80.1 FT) NORTH OF THE CENTER OF A TRACK ROAD, AND 23.8 METER (78.1 FT) WEST OF A UTILITY POLE. THE MARK IS 0.3 METERS E FROM A WITNESS POST. THE MARK IS 1.2 M ABOVE THE HIGHWAY.

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.
  • 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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