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Details for Benchmark: QH0611

N 45° 17.983 W 071° 16.969 (NAD 83)

Altitude: 2260

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

Location:
In COOS county, NH View Original Datasheet
Designation:
MON 489 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.

On Saturday we worked our way up Indian Stream Road in Pittsburg. At the very northern end, we picked up a herd path heading north towards the boundary. Our goal was that northern point in New Hampshire that you may have noticed if you look closely at the map. The point is just past Monument 489, and we would pass by that first.

We got to the boundary vista with little problem and soon came to the Monument. From a distance it looked fine, but up close we could see a crack around the base of the granite. It looked damaged and possibly in danger of being broken off. Look at the last photo and see what you think.

After passing by this monument, we soon arrived at the northern point, and found the boundary line marker that marked the turniong point. It was numbet 489-5.

[Photos:]
photoQH0611 "MON 489 IBC", Pittsburg NH
Monument from a distance.
photoQH0611 "MON 489 IBC", Pittsburg NH
photoQH0611 "MON 489 IBC", Pittsburg NH
Closeup showing cracks at the base of the granite.
photoIBC Line Marker 489-5, Pittsburg NH
This disk marks the north pointing turn in the border. It's the 2nd northernmost point in NH, the point near Monument 475 being the northernmost.

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.
01/01/1950 by IBC (POOR)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1950 (RKL) BASE BADLY BROKEN. OLD CONCRETE WAS REMOVED TO A DEPTH OF ABOUT 8 INCHES AND REPLACED WITH NEW CONCRETE.
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 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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