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Details for Benchmark: FQ0448

N 35° 12.283 W 111° 38.650 (NAD 83)

Altitude: 6994.83

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

Location:
In COCONINO county, AZ View Original Datasheet
Designation:
A 492
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Decided to come find this benchmark while caching in Flagstaff this morning. Nice and easy to find.

[Photos:]
photoA 492
The disk in the rock
photoA 492
Witness post

Found bench mark as described with intact marker stake. Coordinates with my GPSr N35 12.289 W111 38.666. See attached photo.

[Photos:]
photoA492 Benchmark off San Francisco St. / Flagstaff

Got it w/witness post intact.

[Photos:]
photoBM Flagstaff Upper SanFranSt0003_2

I had looked before and had a tough time. Kinda popped up right before my eyes!

Recovered in good condition.

[Photos:]
photoA 492 in Flagstaff AZ
photoA 492 view south

You can do this without getting out of your car!

Found on the way to a less easy benchmark.

[Photos:]
photoA 492, Flagstaff, AZ
photoLooking S along E edge of San Francisco St

Saw this one on the way to find the YOU cache during our Flagstaff trip.

N 35° 12.287 W 111° 38.666

Benchmark recovered as described, in good condition.

[Photos:]
photoBenchmark w/GPSr
photoBenchmark
photoNorth at Benchmark
photoEast at Benchmark

Documented History (by the NGS)

01/01/1982 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1982 4.7 KM (2.9 MI) NORTH FROM FLAGSTAFF. 3.7 KM (2.3 MI) NORTHEAST ALONG US HIGHWAY 89 FROM THE JUNCTION OF INTERSTATE HIGHWAYS 17 AND 40 IN FLAGSTAFF, THENCE 1.0 KM (0.6 MI) NORTH ALONG SAN FRANCISCO STREET, IN TOP OF A VOLCANIC OUTCROP AT THE NORTH END OF A CUT, 8.2 METERS (27 FT) EAST OF THE CENTER OF SAN FRANCISCO STREET, 87.7 METERS (288 FT) SOUTH OF THE CENTER OF EAST SWITZER CYN DRIVE, 22.8 METERS (75 FT) NORTH OF A POWER POLE WITH A STREET LIGHT. THE MARK IS 0.3 METERS W FROM A WITNESS POST. THE MARK IS 1.0 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.
  • 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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