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Railway viaduct, first constructed in 1858 by Joseph Mitchell with a plate girder span, which was replaced in 1906 by the present steel lattice girder span. A plaque from 1905 records Messrs Head Wrightson of Thornaby-on-Tees as contractors for the later span, with William Roberts, Engineer and William Whitelaw, Chairman, Highland Railway. The viaduct is constructed from tooled ashlar, with some bull-faced ashlar dressings. There is a 6 span approach at the West bank, and single approach span at the East bank. The West bank has 3 wide and 3 narrower rusticated and keystoned arch rings, the wider spans are close to the river bank, and are supported by bull-faced ashlar cutwaters. The East bank has a single arch ring, borne on bull-faced cutwaters. There are panelled pilastered end abutments, as well as string courses and ashlar copes. The approximate span of the steel girder bridge section is 250 feet (76 metres), and the overall span of the viaduct is 635 feet (194 metres). It is also known as the Spey (Orton) viaduct.
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Historic Environment Records (HER) 
Moray
HER -
NJ35SW0010 - BOAT O'BRIG VIADUCT