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Work on Nepean Dam started in 1925, but was interrupted for a few years by the Depression and resumed in 1933. Materials were hauled on a standard gauge railway line from the main southern line near Bargo.

The dam was finally completed in 1935 and cost about $12.3 million. After several years of extremely low rainfall in the catchment, heavy rainfall in October 1938 saw the dam finally reach capacity and overflow via its spillway.

Nepean Dam was upgraded in 1992 at a cost of $30 million. It was strengthened by post-tensioned anchors and a downstream rockfill embankment and further safeguarded by a concrete lined side spillway on the right abutment.

Height: 82 metres

Length: 216 metres

Capacity: 70,170 megalitres

Catchment: 320 square kilometres

Lake: 3.3 square kilometres

Destinations to explore near Nepean Dam

Photos Courtesy Scott Westlake Photography

Distance & direction from Sydney: 95 Klms SW

Avon Dam Road, Bargo

 Tel: 1300 722 468

Nepean Dam

Historic Site, New South Wales

During Construction - ca. 1926 - 1935

Courtesy: Campbelltown City Library

Near Completion

Courtesy: State Records NSW