Location: Segovia, Spain
In 1929 the Spanisch dammed the river Duratón and created the relatively small Burgomillodo reservoir. In 1953 new building techniques were developed and the dam was rebuild so to hold a capacity of 14 cubic hectometer. The reason for this sheer amount of volume is that over the years the river cut through the ground which mostly consisted of limestone and created a narrow and high valley.
The Burgomillodo reservoir is now Part of the “Natural Park Hoces del Río Duratón”. This park is part of the natura 2000 sites in Europe. When you go up the dam you can easily understand why it has this status. A place where people are drawn to. A large waterbody and nature surrounding it. Different birds of prey flying over the valley and quit water for water sport, kayaking and rowing. Everything you see is just beautiful. Even the town sitting below the hydropower instillation has a perfect spanisch setting with the old houses, bridge and a creek flowing below it.
There is only one thing overlooked, fish. A local dam engineer stated that he: did not suspects any significant numbers of fish in the reservoir with exception of some carp species.
There was a study conducted in 1990 about the characteristics of the river. This stated that the river below the dam where not optimal for fish live due to the lack of oxygen created by the different flows of the dam.
So even though the site is characterized as rich biodiversity if you look underwater you see quite the opposite.