Loch Doon Dam, Galloway Hydro Electric Power Scheme

Loch Doon Dam, part of the Galloway Hydro Electric Power Scheme, was designed by James Williamson with consulting engineers Sir Alexander Gibb and Merz and McLellan in 1936. It features a long, shallow curved-section concrete arch and gravity dam, which includes an elevated roadway along the crest supported by an arcade of shouldered arches over a fixed spillway on the northern side. To the southern side, there is a stepped eaves course. An octagonal fish ladder is located on the upstream face, which has a concrete outer shell and a continuous spiral of sequential octagonal pools inside. The roadway has a concrete parapet with larger piers that act as buttresses on the upstream face. Additionally, there is a control room on the upstream face, supported by corbelled brackets, featuring a single round-headed window in the center. The downstream face has a large fixed spillway with curved concrete wave-walls.