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Details for Benchmark: QH0512

N 45° 19.824 W 071° 00.241 (NAD 83)

Altitude: 2211

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

Location:
In OXFORD county, ME View Original Datasheet
Designation:
MON 471 IBC
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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On Tuesday the 12th, Pierre, my hiking partner and I hiked Marble Mountain and the two peaks of Saddle Hill which lie on the Maine-Canada border near the village of Notre Dame des Bois. We gained access to the border via the trails of Sentiers frontaliers. From Notre Dame de Bois we drove on the dirt Route du 10e Range and turned left on Chamin du 10e Rang Est. We parked about 2 kilometers past the turn.

The border swath is a 20 meters wide cleared path along the boundary. Boundary monunments were set in 1845 and occur about every mile or two and are numbered from east to west. The triangulation stations were set in 1915 when the boundary was surveyed via trangulation. Triangulation stations were on boundary peaks or on peaks up to several kilometers from the boundary on either side.

This monument was located at the base of and to the south of Marble Mountain and was in good condition. The vegetation in the area was somewhat overgrown and the monument was nearly obscured from view.

This monument also has an IBC bench mark on it's base. This mark is not un the NGS database although the USGS has used them for map control.

[Photos:]
photoQH0512 "MON 471 IBC", Maine-Canada border
photoQH0512 "MON 471 IBC", Maine-Canada border
photoQH0512 "MON 471 IBC", Maine-Canada border
Many of the monuments have embedded bench marks such as this. They are not in the NGS database, although the USGS has used them for map control.

Documented History (by the NGS)

01/01/1845 by IBC (MONUMENTED)
DESCRIBED BY INTERNATIONAL BOUNDARY COMMISSION 1845 CAST - IRON POST, 6 FEET LONG, WHICH IS NOW SET IN A CONCRETE BASE 3 FEET SQUARE WITH THE TOP OF THE CAST - IRON POST RISING 3 FEET ABOVE THE SURFACE OF THE BASE.
01/01/1965 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1965 (HGD) STATION RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1998.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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