The building of the reservoir resulted in the 'drowning' of the villages of Ashopton and Derwent (including Derwent Woodlands church and Derwent Hall). Ashopton stood roughly where the road to the Snake Pass met the Snake valley. The buildings in Ashopton were demolished before the reservoir was filled, but much of the structure of Derwent village was still visible during a dry summer some 14 years later. The narrow stone Packhorse Bridge over the Derwent was removed and rebuilt at the head of the Howden reservoir. The clock tower of the church had been left standing and the upper part of it was visible above the water level until 1947, when it was seen as a hazard and demolished with explosives on 15 December. en.wikipedia.org/wiki/Ladybower_Reservoir