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Details for Benchmark: QH0625

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N 45° 00.806 W 071° 30.128 (NAD 83)

Altitude: 1079

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

Location:
In ESSEX county, VT View Original Datasheet
Designation:
MONUMENT 518
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

Reference Points

Nearest

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Found it 4/21/2007 Zorro8561 found QH0625 (NGS Benchmark)   Visit Log
Found it today with the family in our first trip to USA
Was easy just near the border
Watchman was asking why i want picture of that thing hihihi


Found it 10/5/2006 Papa-Bear-NYC found QH0625 (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 mark is a special IBC boundary monument. It was one of only 13 (out of 775) cast iron posts set in 1845 which were larger than the others (5 feet vs. 3 feet above ground) and were set at significant turning points of the border. This one, no. 518, was set just west of Halls Stream (the northwestern most tributary of the Connecticut River) where it crosses the 45th parallel. It is the point were the border changes from following the stream south for approximately 25 miles from the northern mountains of New Hampshire, to where it goes straight west along the (old survey of) the 45th parallel to the Saint Lawrence River.

I checked with the customs and border patrol guys at the Beecher Falls customs station and they couln't think of a reason not to OK my walk along the short section from the road over to the stream. The pictures tell the rest of the story.

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

[This entry was edited by Papa-Bear-NYC on Friday, October 13, 2006 at 5:27:22 PM.]

Photos:
photoQH0625 "MONUMENT 518", Beecher Falls, VT
View from Route 253 along the boundary vista towards Halls Stream. Monument 518A is in the foreground near the road and this station, Monument 518, is in the distance.
photoQH0625 "MONUMENT 518", Beecher Falls, VT
Closeup of munument. It stands about 5 feet high above the concrete base.
photoQH0625 "MONUMENT 518", Beecher Falls, VT
View looking east towards Halls Stream (which is obscured by the trees and bushes).
photoQH0625 "MONUMENT 518", Beecher Falls, VT
View looking west. Notice the vista cut through the trees past the road into the distance. It goes in a nearly straight line all the way to the Saint Lawrence River.

Documented History (by the NGS)

1/1/1845 by IBC (MONUMENTED)
DESCRIBED BY INTERNATIONAL BOUNDARY COMMISSION 1845 STATION MARK--A SPECIAL-TYPE CAST-IRON POST ABOUT 58 IN HIGH. SET IN A CONCRETE BASE 5X5X5 FEET DEEP. NOTE--THIS DESCRIPTION HAS NOT BEEN FIELD CHECKED.
1/1/1927 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1927 (FHB) A NEW ELEVATION WAS DETERMINED FOR MONUMENT IN 1927.
1/1/1980 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1980 (DD) MONUMENT WAS 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 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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