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Details for Benchmark: OC2809

N 43° 59.383 W 071° 05.283 (NAD 83)

Altitude: 467

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

Location:
In CARROLL county, NH View Original Datasheet
Designation:
101 0500
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Easy find. Still fun.

[Photos:]
photoOC2809

Found easily.

[Photos:]
photo101 0500 , N.H.
photoRock with Benchmark

Found In Good Condition.

[Photos:]
photo OC2809
photo OC2809 SETTING

Easy to find- and a great one for first time!

Recovered at the described location in GOOD condition. The mark is surronded by three, evenly spaced drill holes, each about 2 foot off in radius. Stamped 101 0500 by the New Hampshire Department of Transportation.

[Photos:]
photoOC2809, 101 0500, NHDOT
photoOC2809, 101 0500, NHDOT
Showing the monumented ledge with two of the three drill holes triangulating the disk.

Survey disk was found in good condition as described.

[Photos:]
photoOC2809.jpg

Documented History (by the NGS)

01/01/1991 by NHDOT (MONUMENTED)
10/13/1992 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1992 THE STATION IS LOCATED IN CONWAY. TO REACH THE STATION FROM THE JUNCTION OF STATE ROUTE 113-WEST AND U.S. ROUTE 302 IN CONWAY, GO WEST FOR 0.35 MI (0.56 KM) ON ROUTE 113 TO THE STATION ON THE LEFT. ALSO, TO REACH THE STATION FROM THE JUNCTION OF STATE ROUTES 116 AND 113 IN CONWAY, GO EAST FOR 1.65 MI (2.66 KM) ON ROUTE 113 TO THE STATION ON THE RIGHT. THE STATION IS A STANDARD NHDOT DISK STAMPED---101 0500---SET IN THE TOP OF A 9-FT BY 8-FT PARTIALLY EXPOSED ROCK LEDGE PROJECTING 2.5-FT ABOVE THE GROUND AND 4-FT HIGHER THAN THE LEVEL OF THE HIGHWAY. LOCATED 160 FT (48.8 M) EAST FROM THE CENTER OF ODELL HILL ROAD, 134 FT (40.8 M) WEST FROM THE CENTER OF AN ASPHALT DRIVEWAY LEADING TO SACO WOODS, 100 FT (30.5 M) NORTHEAST FROM POWER POLE 333/456/PSNH/NET/205E/145, 62.5 FT (19.1 M) SOUTH FROM THE CENTER OF ROUTE 113, 38.5 FT (11.7 M) NORTHWEST FROM POWER POLE 933/NET/144/333/457/PSCO.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1997.
  • 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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