The national park extends south as far as the Wollondilly River, west of Mittagong, New South Wales. This area was greatly affected by the construction of Warragamba Dam from 1948 to 1960. This required the flooding of the Burragorang Valley, which created Lake Burragorang and in the process cut the southern part of the Blue Mountains off from areas to the east, for example Camden, Picton and Bargo. Properties and homesteads in the southern part of the mountains were forced to close down, leaving many derelict homes and ruins. These included Bran Jan House and Kowmung House on Scotts Main Range,Treks in New South Wales, Neil Paton (Kangaroo Press) 1986, pp. 83-84 as well as Twin Peaks, south of Yerranderie.
The national park extends south as far as the Wollondilly River, west of Mittagong, New South Wales. This area was greatly affected by the construction of Warragamba Dam from 1948 to 1960. This required the flooding of the Burragorang Valley, which created Lake Burragorang and in the process cut the southern part of the Blue Mountains off from areas to the east, for example Camden, Picton and Bargo. Properties and homesteads in the southern part of the mountains were forced to close down, leaving many derelict homes and ruins. These included Bran Jan House and Kowmung House on Scotts Main Range,Treks in New South Wales, Neil Paton (Kangaroo Press) 1986 pp. 83-84 as well as Twin Peaks, south of Yerranderie.