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Details for Benchmark: AI5756

N 38° 35.201 W 078° 21.661 (NAD 83)

Altitude: 3603

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

Location:
In MADISON county, VA View Original Datasheet
Designation:
THORO ERDL AZ MK 2
Marker Type:
azimuth mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Found as described in good condition

[Photos:]
photoAI5756 on the Skyline Drive, VA
closeup of disk
photoAI5756 on the Skyline Drive, VA
the setting

Found as described.

Still there.

[Photos:]
photoTHORO ERDL AZ MK 2

Found in good condition, despite some minor vandalism.

[Photos:]
photoAI5756 - Closeup
photoAI5756 - Area View
Looking Northwest on Skyline Drive towards Thorofare Mountain Overlook. Arrow points to benchmark.

Found as described.
Recovery report submitted to the NGS.

[This entry was edited by NorthWes on Wednesday, October 17, 2007 at 9:37:57 PM.]

[Photos:]
photoAI5756 THORO ERDL AZ MK 2 (closeup) MADISON cy VA
photoAI5756 THORO ERDL AZ MK 2 (view SW) MADISON cy VA
Looking SW over the mark (back towards Skyland) to Skyline Drive.

Please see the complete recovery, including text and photos, at my website: [b][url=http://surveymarks.planetzhanna.com/surveymarks/ai5756/]AI5756 - THORO ERDL AZ MK 2[/url][/b].

Zhanna

This entry was edited by Zhanna on Friday, 07 December 2012 at 02:11:55 UTC.

Location as described in the NGS Data Sheet.

[Photos:]
photoTHORO ERDL AZ MK 2 -- Madison County, VA

As described.

[Photos:]
photoAI5756 AZ MK.JPG

Found during unsuccessful attempt to find HW3272. Badly beat up.

[Photos:]
photoAI5756- THORO ERDL AZ MK mark
photoAI5756- THORO ERDL AZ MK 2 site

Recovered as described. Fun to find.

[Photos:]
photoAI5756

I had just finished finding GC65C5 and was taking a breather and a couple of photos, when lo and behold this marker was immediately beneath my feet!

[Photos:]
photomysteryhouse
My first benchmark find!

Documented History (by the NGS)

01/01/1959 by CGS (MONUMENTED)
03/16/2000 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 THE STATION MAY BE REACHED FROM THE JUNCTION OF US HIGHWAY 211 AND SKYLINE DRIVE AT THORNTON GAP BY GOING SOUTH ALONG SKYLINE DRIVE FOR 3.9 MILES TO AZIMUTH MARK NO. 1 ON THE LEFT AT PINNACLE OVERLOOK. CONTINUE SOUTHERLY ON SKYLINE DRIVE FOR 5.85 MILES TO THE STATION ON THE LEFT, ABOUT 500 FEET SOUTHWEST OF THE STATION, ON THE SOUTH SIDE OF SKYLINE DRIVE, SET IN A DRILL HOLE IN OUTCROPPING BEDROCK. IN OUTCROPPING BEDROCK.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 2000.
  • The orthometric height was determined by GPS observations and a high-resolution geoid model.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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