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Altgran Bridge (Culcairn Bridge)
Culcairn, near Alness, Highland, Scotland
associated engineer
John Smeaton
date  1777
era  Georgian  |  category  Bridge  |  reference  NH608663
ICE reference number  HEW 2548
In a report of 1772, Smeaton named this structure Altgran Bridge after the river it crosses. However, that river is now called Glass and the bridge is more usually known as Culcairn Bridge after the village it serves. Culcairn Bridge carries a minor road running north-east along the north shore of Cromarty Firth.
Altgran is probably the most northerly bridge designed by Smeaton. Its original single masonry arch is now quite hard to see, as the structure has been widened on both sides. Smeaton's masonry can only be seen from below, accessible only at low water.
The 1777 bridge replaced an earlier timber one at this site. Smeaton's arch has a span of 15.2m and was 4.9m wide. It has a 400mm deep chamfered springer course and a stone invert, both now hidden.
Research: ECPK
reference sources   CEH SHIJS
Location

Altgran Bridge (Culcairn Bridge)