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Details for Benchmark: FH0805

N 35° 23.258 W 094° 25.779 (NAD 83)

Altitude: 438.97

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

Location:
In SEBASTIAN county, AR View Original Datasheet
Designation:
FORT
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Found in good condition visiting the fort today.

Out doing a little benchmarking with BasicPoke and grabbed this one.
We were not able to locate the reference marks.

Made the find on a windy & rainy day...still there

I had looked for this one last weekend with no luck. Came back today to go through the musuem and after looking at the write up on this we thought we would try it again. Front markers at the beginning of the sidewalk walk 30 feet toward the tree. The wife spotted it after a minute of looking, bushed the dirt away for the picture.

[Photos:]
photoFH0805 closeup
photoFH0805 scene

Found using better cords of secondgunman. The bench mark had a little dirt on it but was able to wipe off for a picture.

[Photos:]
photoFH0805
photoScene
N 35° 23.259 W 094° 25.779

This benchmark was a little difficult to find, but thanks to a prior picture I was able to find it by poking around with a pocket knife. There is a new monument-type structure on the southeast corner of the historic site, with a bronze plaque that says "Fort Smith National Historic Site / Gateway C". The disk is located exactly 30.8' from this monument, measured on a straight line from the southwest corner of the monument directly toward the large tree which stands ~50' to the west. The coordinates associated with this post are derived from GoogleEarth.

[Photos:]
photoFH0805 Close-up
photoFH0805 Set
photoFH0805 Scene
30.8' from the monument to the disk, directly toward the tree.
N 35° 23.247 W 094° 25.774

Coordinates are pretty good. The mark is maybe 0.25" underground. No digging was required, but it did take some serious brushing off to uncover it. The mark is on the line drawn between the tree in the 1959 description and the highest point of the stone structure on the south of gateway C, 15ft from the tree and 10.5m from the peak of the gateway.

This entry was edited by secondgunman on Friday, 03 September 2010 at 07:47:32.

[Photos:]
photoMarker
photoView 1
This image shows the marker in center frame (under my GPSr). On the very left side of the image you can just make out the gallows. On the right side you can see the courthouse building. This photo was taken at Gateway C, near the parking area at the corner of 3rd and Parker.
photoView 2
This photo shows the marker as seen from the tree. Gateway C and the maintenance building are in the background. The intersection of 3rd and Parker is visible through the "tree" on the right side of the photo.

Description has good coordinates, but since the reconstruction of the Fort Smith Historical Site Third Street no longer goes through to Parker Street. The NPS took out the street and filled in it in with dirt and grass. The former intersection of Parker and Third Street is a small parking lot by the NPS maintenance facility. The benchmark is east of an Oak Tree. Good hunt, enjoy the park.

OzarkMtnGhost

Documented History (by the NGS)

01/01/1935 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (CAS) STATION IS LOCATED IN THE CITY OF FORT SMITH, ARKANSAS, IN THE NW 1/4 SEC. 17, T 8 N, R 32 W ON LAND OWNED BY THE U.S. GOVERMENT AND OCCUPIED BY THE FORT SMITH WELFARE ASSOCIATION. THE MARK IS SET IN THE SE CORNER OF THE LOT, 171 FEET SE OF THE SE CORNER OF THE WELFARE ASSOCIATION BUILDING, 22 FEET NNE OF THE FENCE ON THE S SIDE OF THE LOT, 22 FEET WNW OF THE FENCE ON THE E SIDE OF THE LOT. MARK PROJECTS 2 INCHES. SURFACE, UNDERGROUND, REFERENCE AND AZIMUTH MARKS ARE STANDARD BRONZE DISKS SET IN CONCRETE. REFERENCE MARK NO.1 IS NNE OF THE STATION ON THE E EDGE OF THE LOT, 1 FOOT W OF FENCE, 176 FEET ESE OF THE SE CORNER OF THE BUILDING AND PROJECTS 10 INCHES. REFERENCE MARK NO.2 IS W OF THE STATION, 1 FOOT N OF THE FENCE ON THE S EDGE OF THE LOT, 113 FEET S OF THE SE CORNER OF THE BUILDING AND PROJECTS 10 INCHES. AZIMUTH MARK IS SSE OF THE STATION ON THE W SIDE OF THE STREET. IT IS 20 FEET WSW OF THE CENTER LINE OF THE STREET ABOUT 30 FEET N OF THE RAILROAD CROSSING AND PROJECTS 8 INCHES. ALL LIGHTS COME INTO VIEW AT 70 FEET.
01/01/1947 by AMS (GOOD)
RECOVERY NOTE BY US ARMY MAP SERVICE (NOW DMA) 1947 (MLC) STATION WAS RECOVERED IN GOOD CONDITION. THE MEASUREMENTS ARE CORRECT TO THE INSIDE EDGE OF THE CONCRETE SIDEWALK INSTEAD OF THE FENCE. STATION DISK IS STAMPED FORT 1935.
01/01/1959 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (FAR) THE STATION AND R.M. NO. 1 WERE RECOVERED AND FOUND IN GOOD CONDITION. THE STATION IS NORTHWEST OF THE INTERSECTION OF SOUTH 3RD STREET AND PARKER AVENUE, ABOUT 52 FEET NORTH OF THE CENTERLINE OF PARKER AVENUE, ABOUT 42 FEET WEST OF THE CENTERLINE OF SOUTH 3RD STREET AND ABOUT 15 FEET EAST OF A LONE TREE. R.M. NO. 1 IS NORTH-NORTHEAST OF THE STATION AT THE WEST EDGE OF THE SIDEWALK. R.M. NO. 2 WAS NOT FOUND. A ROCK AND WOOD ENCLOSURE HAS BEEN BUILT ABOUT 100 FEET WEST OF THE STATION AND THE MARK WAS PROBABLY DESTROYED WHEN THIS WAS DONE. A SEARCH WAS MADE FOR THE AZIMUTH MARK BUT IT WAS NOT FOUND. THIS MARK HAS PROBABLY BEEN DESTROYED BY STREET IMPROVEMENT.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 IN FORT SMITH. IN FORT SMITH, THE MARK IS AT THE OLD HISTORIC COURTHOUSE GROUNDS ON THE FORT SMITH HISTORIC SITE, 0.3 KM (0.2 MI) WEST ALONG ROGERS AVENUE FROM THE MAIN POST OFFICE, 15.85 METERS (52.0 FT) NORTH OF THE EXTENDED CENTER OF PARKER AVENUE, 13.05 METERS (42.8 FT) WEST OF THE CENTER OF THIRD STREET, 4.75 METERS (15.6 FT) EAST OF A MAPLE TREE. THE MARK IS 0.61 M ABOVE THIRD STREET.
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 established by classical geodetic methods and adjusted by the National Geodetic Survey in September 1999.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • 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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