Ladybower Dam, Plug Hole, Derbyshire, UK
The Ladybower Dam was built between 1935 and 1943, and took a further two years to fill (1945). The building of the dam wall was undertaken by the Scottish company of Richard Baillie and Sons. The two viaducts, Ashopton and Ladybower, needed to carry the trunk roads over the reservoir, were built by the London firm of Holloways, using a steel frame clad in concrete. Both firms encountered mounting problems when World War Two broke out in 1939 making labour and raw materials scarce. The opening ceremony for the reservoir was carried out on Tuesday September 25th 1945 by King George VI accompanied by Queen Elizabeth, later to become the Queen Mother.
During the 1990s the wall was raised and strengthened to reduce the risk of 'over-topping' in a major flood.
The dam's design is peculiar in having two totally enclosed bellmouth overflows (locally named the 'plugholes') at the side of the wall. The easterly overflow originally had a walkway around it but this was dismantled many years ago.
(Thanks to Kraigsta for the description).
Being used for a book cover in Oct 2009.