Print

MHG55403 - Fundamental bench mark, Loch Tarff

Summary

Loch Tarff fundamental bench mark (FBM), part of the Ordnance Survey's framework of permanent height markers.

Type and Period (1)

Protected Status

Full Description

NH 4221 0948 At a height of 297.88m, the position of the Loch Tarff FBM is given as 6.6m from N side of road and 95m W of a culvert (though these measurements cannot be reconciled with the modern map depiction).
Information from Mark Greaves (OS) 23 November 2011

An underground concrete chamber containing two permanent height markers, and marked at ground level by a granite pillar about a foot high. The two primary reference points lie underground and consist of a gun metal bolt and polished flint both set into fine granolithic concrete and protected by iron covers. A gun metal bolt on the granite pillar provides a third reference point.
There are currently 194 fundamental bench marks across the UK mainland (22 in Highland) which were built between 1911 and the early 1950s. They are established along the Geodetic lines of levels at approximately 30 mile intervals. Loch Tarff FBM records an altitude of 297.88m AOD. <1>

The Ordnance Survey Geodesy Team have asked to be notified of any development proposals which meet the following criteria:
1) If an FBM falls inside the boundary, or within 30m of the boundary of a proposed development upon completion.
2) If an FBM falls inside the boundary, or within 30m of the boundary of the "construction area" or any other temporary area of a proposed development.
They also wish to be notified in any other case where an FBM may be at risk of disturbance. Should an FBM be threatened they will create a new one nearby at their own expense before the threatened one is lost. This is to ensure the continuing integrity of this vital network. <2>

Sources/Archives (2)

Map

Location

Grid reference	Centred NH 4220 0947 (60m by 60m) (2 map features)
Map sheet	NH40NW
Civil Parish	BOLESKINE AND ABERTARFF
Geographical Area	INVERNESS

Finds (0)

Related Monuments/Buildings (0)

Related Investigations/Events (0)

External Links (2)