Valve Gatehouse, Loch Sloy Dam, Sloy Awe Hydro Electric Scheme

The Valve Gatehouse at Loch Sloy Dam is part of the Sloy Awe Hydro Electric Scheme, designed by engineer James Williamson for the North of Scotland Hydro Electric Board's technical panel in 1936 and built from 1946 onwards. This large buttress dam features an access roadway that oversails prominent arcaded buttresses, with a fixed spillway integrated into the center alongside a control tower, dominating the upper reaches of the Inveruglas water. The structure is primarily made of shuttered concrete, with some reinforced concrete used for the parapet and the gatehouse control tower. The downstream face is battered, supported by deep buttresses with rounded-headed gaps between them. A large central buttress forms the fixed spillway, which includes a central rib that integrates with a dispersal valve at the base and the control tower at the parapet. The top of the dam features a parapet with small buttressed piers rising from the center of the main buttresses.

The Tunnel Intake and Dispersal Valve Gatehouse is located directly adjacent to the upstream face of the dam on a large concrete pier that incorporates intakes for the tunnel and dispersal valve beneath the waterline. The southeast elevation has large panelled teak vehicular access doors, while the southwest and northeast elevations feature paired narrow rectangular windows.