Early on a spring morning in the Peak District last year. I sat around for quite a while waiting for the sun to get high enough to light up both of the towers on the dam.
Wikipedia says: The Howden Reservoir is a Y-shaped reservoir, the top of the three in the Upper Derwent Valley, England. The western half of the reservoir lies in Derbyshire, whereas the eastern half is in South Yorkshire, the county border running through the middle of the reservoir, following the original path of the River Derwent. Tributaries include the River Westend, Howden Clough and Linch Clough, and the longest arm is 2 km in length. Below the dam, the River Derwent flows immediately into Derwent Reservoir and subsequently the Ladybower Reservoir. To the east of the reservoir stands the hill of Featherbed Moss, one of the highest in the area at 545 m.
Work commenced on the dam's construction in July 1901 and completed in July 1912. The works involved constructing a temporary village at Birchinlee, or "Tin Town", for the workers, and a temporary railway line from the main line at Bamford. The dam is of solid masonry construction, and 117 ft tall (36 m), 1,080 ft long (330 m). and impounds 1,900,000 imperial gallons (8,600 kl) of water, from a catchment area of 5,155 acres (20.86 km2).