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Details for Benchmark: FH0806

N 35° 23.233 W 094° 26.000 (NAD 83)

Altitude: 407.96

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

Location:
In SEBASTIAN county, AR View Original Datasheet
Designation:
C 295
Marker Type:
vertical control disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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If the disk is still there we did not locate a disk during our search. We did locate the rod mentioned in a past post.

This entry was edited by bearbrew on Sunday, 03 March 2013 at 00:37:56 UTC.

After more hours of searching than I care to think about, I'm logging this one as a DNF. The large metal pole in the description is nowhere to be found. There is a large wooden flagpole at the old fort site at N 35° 23.263', W 094° 25.950'. Several conversations with Rangers from the Historic Site leave me convinced that this is the only large pole that has been anywhere near the old fort site for at least 25-30 years. Working from that assumption, I did a thorough visual inspection of the area 355 feet from that flagpole at bearings from 220-230 degrees. No disc was found, but there is a good deal of dirt covering the area. A more thorough inspection with a metal detector might uncover something. I did find something that resembles a railroad spike in the bedrock outcrop in this area, but there was no disk. The railroad spike thing can be found at N 35° 23.218', W 094° 26.006'.

On the assumption that there was a transcription error in the description, I also searched an area 355 feet from the flagpole to the NORTHwest of the flagpole. This area doesn't get anywhere near the bedrock outcrops or near the river. The only thing remotely promising was a green metal post, of the type that is sometimes used to support a Survey Marker sign. Unfortunately, I spoke with the man who placed the post (don't remember his name, sorry) and that post is there simply to hold up the chicken wire around the tree that it sits a foot or so from. He used it simply because he ran out of the orange posts he used on other trees in the area.

There IS a benchmark disk in the area of my SW search.....but it's the wrong marker. US Army Corps of Engineers marker POTEAUNAV is located at N 35° 23.195', W 094° 25.984'. The easiest approach to this marker at this time is from the tourist trail, through some reasonable brush that includes a small patch of poison ivy. At this time, it's not possible to approach this marker from the north along the rock outcropping.

Photos to follow as soon as I can find where I put them.

Took awhile to find this one, the coordinates gets you in the right area. Mine was about 50 feet off. Beautiful view of the Arkansas River. This is a fun hunt, just don't pull your hair out trying to find it. Remember the rock outcrop setting. Good Luck.

OzarkMtnGhost

Documented History (by the NGS)

01/01/1984 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 IN FORT SMITH. IN FORT SMITH, 0.3 KM (0.2 MI) WEST ALONG ROGERS AVENUE FROM THE MAIN POST OFFICE TO THE HISTORIC COURTHOUSE THEN WALK WEST ACROSS THE TRACKS AND ALONG THE TOURIST TRAIL TO THE SITE OF THE OLD FORT THE MARK IS A DISK SET IN AN OUTCROP OF BEDROCK AT THE EDGE OF THE ARKANSAS RIVER, 108.20 METERS (355.0 FT) SOUTHWEST OF A LARGE METAL POLE AT THE OLD FORT SITE. THE MARK IS 1.22 METERS NNE FROM A WITNESS POST. THE MARK IS 6.10 M BELOW LEVEL OF THE OLD FORT.
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION.
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (LDM) RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (MS) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (LDM) RECOVERED IN GOOD CONDITION.
11/01/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 RECOVERED IN GOOD CONDITION.

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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