Earlstoun Dam, Galloway Hydroelectric Power Scheme

Earlstoun Dam, part of the Galloway Hydroelectric Power Scheme, was designed by consulting engineer Sir Alexander Gibb and electrical engineers Merz and McLellan in 1936. The dam has a roughly U-shaped plan and consists of two distinct structural sections: one is an arch type and the other is a gravity type. It is constructed from reinforced concrete and features a continuous concrete parapet along the walkway.

To the left (west) is a fixed spillway with a roadway above, supported by narrow profile piers, with a deeper pier on the far left that forms a gateway to the walkway. In front of the spillway is a concrete wave-wall that sweeps around to the outflow from roller gates located at the center of the spillway section. Above the gates is a tower on the walkway that has shouldered arched openings and winding gear at the top.

On the right (east) side, there is an arched section with a small tower at the center, which has a valve-house directly beneath it at the base of the dam. This tower is supported by paired corbels that flank narrow round arched openings, with an additional corbel at the center supporting an advanced window panel that features a single round arched window in the middle.