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Details for Benchmark: GP0103

N 36° 56.067 W 111° 28.567 (NAD 83)

Altitude: 3876.05

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
E 80
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Found:Good. Along the right side of the Highway, about .3 miles from the Dam Bridge. N 36° 56.086 W 111° 28.584. My HH coords are off a bit, but you will find it.

[Photos:]
photoGP0103 E 80 1957

We hiked all around, then literally stopped to see where we were in relation to the datasheet, and we were on it. HA!

[Photos:]
photoGP0103 E 80 near Page AZ
photoLOc of GP0103 E 80 near Page AZ

Found this while stopped closeby overnight. Good Condition.

During a trip around Page we searched and found this BM.
TFTBM says H_M_A @ 06-18-2012 @ 12:45 o'clock.

[Photos:]
photoThe Benchmark
and the GPS device.

Update for the Marker Type contest.

[Photos:]
photoE 80 contest photo
N 36° 56.090 W 111° 56.067

The offical history is pretty accurate, but it sure helps to have a metal detector along because of all the blow sand. The sand accumulates quickly on the flat areas.

[Photos:]
photoE-80 disk in front of N/S ridge
photoE-80 disk
Near the Glen Canyon Dam (Lake Powell).

Documented History (by the NGS)

01/01/1957 by BOR (MONUMENTED)
01/01/1962 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1962 0.3 MI E FROM PAGE. ABOUT 0.3 MILE EAST ALONG U.S. HIGHWAY 89 FROM THE NORTHEAST END OF THE GLEN CANYON BRIDGE AT PAGE, ARIZONA. 224 FEET EAST-SOUTHEAST OF THE JUNCTION OF THE HIGHWAY AND AN ASPHALT ROAD LEADING TO VISTA POINT, 91 FEET SOUTH-SOUTHEAST OF A TRAFFIC CONTROL LIGHT, 56 FEET NORTHEAST OF THE CENTERLINE OF THE HIGHWAY, 3.0 FEET SOUTHWEST OF THE BASE OF A SANDSTONE FORMATION, ABOUT 3 FEET ABOVE THE LEVEL OF THE HIGHWAY, AND SET IN THE TOP OF A SANDSTONE OUTCROP.
01/01/1983 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN GOOD CONDITION. NEW DESCRIPTION FOLLOWS. 0.5 KM (0.3 MI) SOUTHEAST ALONG US HIGHWAY 89 FROM THE NORTHEAST END OF THE GLEN CANYON BRIDGE IN PAGE, IN TOP OF THE EAST END OF A 42- BY 57-FOOT FLAT AREA OF SANDSTONE OUTCROP BETWEEN A 15- BY 15-FOOT KNOLL OF SANDSTONE PROJECTING 5 FEET ABOVE THE SURFACE OF THE GROUND AND A NORTH-SOUTH RIDGE OF SANDSTONE PROJECTING 10 FEET ABOVE THE SURFACE OF THE GROUND, 0.37 KM (0.23 MI) NORTHWEST OF MILEPOST 549, 17.1 METERS (56 FT) NORTHEAST OF THE HIGHWAY CENTERLINE, 71.4 METERS (234 FT) SOUTHEAST OF THE EXTENDED CENTER OF A PAVED ROAD LEADING SOUTHWEST, 1.3 METERS (4.5 FT) WEST OF THE BASE OF THE SANDSTONE RIDGE. THE MARK IS 1.3 METERS E FROM A WITNESS POST. THE MARK IS 0.6 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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