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Details for Benchmark: QH0623

N 45° 00.807 W 071° 29.982 (NAD 83)

Altitude: 1093

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

Location:
In COOS county, NH View Original Datasheet
Designation:
REF MON 517
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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Found on a Northern Geo-Journey

I just got back from a 5 day hiking trip to the Boundary Range - the ridge line that forms the border between the US and Canada along New Hampshire and western Maine. The area is very remote and the only passage in most parts of the area is over dirt logging roads. I drove up Wednesday and crossed over to Woburn Quebec which is a few miles past the Coburn Gore Maine border crossing, where US Route 27 crosses into Canada. I hiked Wednesday afternoon, Thursday and Friday from the Canadian side and then Friday night crossed into Pittsburg New Hampshire where US Route 3 terminates. Saturday morning I was met by a friend and spent Saturday and Sunday morning hiking from the US side.

This station is a drive up which I recovered on the drive back from northern NH to the Boston area. It is on the Vermont/New Hampshire line just east of Halls Stream (which is the Quebec/New Hampshire border). It's on that little piece of Vermont which lies south of the (old version of the) 45th parallel, east of Halls Stream and west of the Connecticut River. Take the bridge over the Connecticut River from Route 3 to Beecher Falls Vermont. Go right on the first road and then left on Halls Stream Road which is just after the bridge over Halls Stream. The Vermont / New Hampshire line is in about 1/4 mile north. The station is in front of a large maple tree on the left (west) side of the road. It is an IBC triangulation tablet set on the top of the remnant of an old cast iron boundary monument, now cut off near the base.

This is not actually a boundary monument, since the boundary line is the center of the stream about 100 yards to the west. This monument was erected as a reference monument and is aligned with the boundary line west of Halls Stream which follows the (old version of the) 45th parallel.

See the recover log for the history of this station.

Logged as "recovered in good condition" with the NGS on 8/29/2006.

[This entry was edited by Papa-Bear-NYC on Thursday, August 31, 2006 at 8:22:52 AM.]

[Photos:]
photoQH0623 "REF MON 517" area, VT/NH border
View from across the road. The station is at ground level between the edge of the road and the tree.
photoQH0623 "REF MON 517" area, VT/NH border
The tree with the witness sign visible. The mark is in front of the sign.
photoQH0623 "REF MON 517", VT/NH border
Note on the top and right of the frame the top of the old cast iron post which was cut off near the base. I assume they filled the "stump" of the old post with concrete and mounted the disk, although I didn't see what was down under the disk. It was starting to rain so I didn't spend very long here.
photoQH0623 "REF MON 517", VT/NH border
Another view. Note on the top and right of the frame the top of the old cast iron post which was cut off near the base. I assume they filled the "stump" of the old post with concrete and mounted the disk, although I didn't see what was down under the disk. It was starting to rain so I didn't spend very long here.

Documented History (by the NGS)

01/01/1845 by IBC (MONUMENTED)
DESCRIBED BY INTERNATIONAL BOUNDARY COMMISSION 1845 STATION MARK--A CAST-IRON POST ABOUT 38 IN HIGH SET IN A CONCRETE BASE 3X3X3 FEET DEEP.
01/01/1949 by IBC (POOR)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1949 (DFC) CAST-IRON POST SPLIT ALONG LENGTH. POST BONDED TOGETHER.
01/01/1960 by IBC (POOR)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1960 (NWS) BROKEN CAST-IRON POST CUT OFF NEAR BASE AND TABLET SET.
01/01/1971 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1971 (WMS) LOCATED ON THE EXTENSION OF THE WEST LINE INTERNATIONAL BOUNDARY ACROSS HALLS STREAM. RECOVERED ON THE WEST SIDE OF THE ROAD, ABOUT 2 FEET FROM THE TOP OF THE SHOULDER. IT IS ABOUT 1 FOOT BELOW THE SURFACE OF THE ROAD. STATION MARK--A CAST-IRON POST BROKEN OFF ABOUT 4 INCHES FROM CONCRETE BASE WITH A TABLET IN THE TOP.
01/01/1980 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1980 (DD) RECOVERED IN GOOD CONDITION AS DESCRIBED IN 1971.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in May 1998.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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