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Details for Benchmark: QH0577

N 45° 14.020 W 071° 25.434 (NAD 83)

Altitude: 1916

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

Location:
In COOS county, NH View Original Datasheet
Designation:
MON 503 IBC
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

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I spent a productive 4 day weekend in Northern New Hampshire and Vermont in late September. From Friday noon till Monday noon. The weather on Friday and Monday was great, but Saturday and Sunday were rainy. But luckily we escaped the worst of the rain which came late in the day for both Saturday and Sunday.

The targets were all boundary monuments and related marks: Boundary Monuments, Reference Monuments and Triangulations stations used in the boundary survey done from 1914-1919. The Reference Monuments were not in the NGS database, so I include them as "extra credit" stations logged with the nearest NGS station.

I arrived Friday around noon after a drive from the Boston area and explored the lower part of Halls Stream Road, which starts in Beecher Falls (part of Canaan Vermont) and goes up along the east side of the stream (which forms the US / Canada boundary) into New Hampshire.

Sunday the 27th was our big push to the very end of Halls Stream Road. The goal was the boundary monuments at the very end of the land portion of the border (called the Highlands) and to look for reference monuments along the upper portion of Halls Stream. We started at the gate on Halls Stream Road (about 10 miles up) and the road slowly deteriorated and got boggier. Finally we started in at a log yard and bushwhacked up to the border vista. We soon found a herd path, probably used by hunters which showed signs of ATV use. We hit the border just east of Monument 504, but decided to first trek back to Monument 503, close to a mile back along the vista.

The monument was the granite type which was used to replace damaged or broken cast iron monuments (which were originally set in the 1840s) and from the inscription on the base it was renewed in 1993.

[This entry was edited by Papa-Bear-NYC on Wednesday, October 21, 2009 at 11:16:05 AM.]

[Photos:]
photoQH0577 Monument 503, Pittsburg NH
Closeup showing the base.
photoQH0577 Monument 503, Pittsburg NH
The monument, partly hidden in the vegetation of the vista.

Rather than the usual cast iron, this was a granite post marked "Reset 1993"

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.
01/01/1969 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1969 (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 May 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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