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Details for Benchmark: QH0734

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N 45° 00.050 W 071° 31.767 (NAD 83)

Altitude: 1073.65

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

Location:
In ESSEX county, VT View Original Datasheet
Designation:
BOUNDARY REF MON 86
Marker Type:
boundary marker disk
Setting:
driven into the ground
Stability:
Mark of questionable or unknown stability.

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Found it 10/5/2008 irishfrog found QH0734 (NGS Benchmark)   Visit Log
[:D]

Found it 10/5/2006 Papa-Bear-NYC found QH0734 (NGS Benchmark)   Visit Log
Found in good condition.

Over the Columbus weekend I headed up to northern New Hampshire for some hiking, benchmarking and a bit of sight seeing. All the recovered marks (and all but one of the Not Founds) were boundary markers of one sort or another. Some were state boundary markers, some were US-Canada boundary markers and some were IBC triangulation stations (used when the US-Canada border was surveyed in 1915-1916).

Here's a trip report: (visit link)
And here's a set of photo albums: (visit link)

This particular monument is a New Hampshire/Vermont boundary marker. The boundary goes along the west bank of the Connecticut River, but the monuments are up on the Vermont side to provide a firm footing, so thet are all called "Reference Monuments" and the distance and direction to the boundary is stamped on each one. This one has a witness sign visible from the road and it's on a steep embankment, partially covered by dirt and grass.

I recovered another nearby monument, No. 84, which is not in the NGS database, and I've included a picture of it here. The topographic maps show all these monuments.

Logged with the NGS as "Recovered in good condition" on 10/12/2006.

I was back in the are in October 2007 and I bagged another one about 20 miles south (also non-NGS). It's marker no. 73, and it's in a very pretty spot on the west side of the Columbia covered bridge.

[This entry was edited by Papa-Bear-NYC on Wednesday, October 24, 2007 at 6:29:08 AM.]

Photos:
photoQH0734 "BOUNDARY REF MON 86", Beecher Falls VT
View of the witness post from the road. The marker is up slope from the witness post, partially buried.
photoQH0734 "BOUNDARY REF MON 86", Beecher Falls VT
photoQH0734 "BOUNDARY REF MON 86", Beecher Falls VT
photoBoundary Reference Monument 84, Beecher Falls VT
This is NH-VT Monument No. 84, a non-NGS mark, located nearby on the river road near the old power station.
photoBoundary Reference Monument 84, Beecher Falls VT
Closeup of NH-VT Monument No. 84, a nearby non-NGS mark.
photoVT-NH Reference Monument 73
Reference Monument 73 near the Columbia covered bridge.
photoVT-NH Reference Monument 73
Closeup.

Documented History (by the NGS)

1/1/1934 by VTNHBC (MONUMENTED)
8/11/1993 by VTAT (GOOD)
DESCRIBED BY VERMONT AGENCY OF TRANSPORTATION 1993 GENERAL LOCATION, CANAAN VILLAGE, 1.2 MI (1.9 KM) SOUTHWEST OF BEECHER FALLS,VT., AND 7.6 MI (12.2 KM) NORTH OF COLEBROOK,NH. TO REACH FROM THE INTERSECTION OF VT ROUTES 253, 114, AND 102 IN CANAAN VILLAGE GO NORTHEAST ALONG VT ROUTE 253 FOR 0.5 MI (0.8 KM) TO THE MARK ON THE RIGHT. IT IS 1.55 MI (2.49 KM) SOUTH ALONG VT ROUTE 253 FROM THE U.S./CANADA BORDER. STATION MARK IS A 12.5-CM DIAMETER VERMONT/NEW HAMPSHIRE BOUNDARY REFERENCE MARK DISK SET IN THE TOP OF A 30-CM SQUARE GRANITE MONUMENT SET TO A DEPTH OF 1.9 M (6.2 FT) AND PROJECTING 10-CM ABOVE GROUND SURFACE. IT IS ABOUT 96 M (315.0 FT) WEST OF THE CENTERLINE INTERSECTION OF VT ROUTE 253 AND A PAVED ROAD SOUTHEAST, 6.9 M (22.6 FT) SOUTH OF AND ABOUT 1.5 M (4.9 FT) LOWER THAN THE CENTERLINE OF VT ROUTE 253, 20.9 M (68.6 FT) NORTHWEST OF THE CENTERLINE OF THE PAVED ROAD, 2.7 M (8.9 FT) EAST OF POLE NO. 8B/19, 0.15 M (0.49 FT) NORTH OF A FIBERGLASS WITNESS POST.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in August 1994.
  • 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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