Glennies Creek Dam is a 67 metres high, concrete faced, rock fill embankment dam located on Glennies Creek near Singleton, New South Wales, Australia. Glennies Creek is a tributary of the Hunter River in the foothills of the Barrington Tops National Park. The lake is up to 16 kilometres long, and has a capacity of 283 000 megalitres.
The dam was built primarily to replace water withdrawn from the upper Hunter River for electricity generation. Geotechnical problems included weathered, non-welded tuff in the dam foundation and toppling slope failures in welded tuff in the unlined spillway cutting. The dam was constructed by the New South Wales Department of Water Resources and was completed in 1983. The lake impounded by the dam is now known as Lake St Clair.
Glennies Creek Dam spillway is an unlined cutting in welded ash flow tuff which supplied the entire rock fill requirement for the construction of the dam embankment. The spillway excavation was designed to be located entirely in welded tuff and not to encroach on either the underlying non-welded tuff or the overlying sandstone, both of these rock types being much inferior to the welded tuff as a rock fill construction material.
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