The work on Blea Moss is one of 19 projects near Windermere
Environmentalists have built tiny dams in a Lake District valley to protect wildlife under threat from erosion.
Staff from the Lake District National Park Authority, Cumbria Wildlife Trust and the National Trust have used larch and stone to slow down water flow on Blea Moss in Little Langdale.
National Park ranger David Switzer said the area was an important habitat for insects including dragonfly.
The Windermere Reflections project is supported by the Heritage Lottery Fund.
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