The Blue Mountains Dams are a series of six dams in the Blue Mountains which supply water to the Blue Mountains and Sydney, Australia. The Dams are managed by the WaterNSW. Water in this scheme may be supplemented from the Fish River Scheme. Cascade Dams There are three dams built on the Cascade Creek, near Katoomba, known as Cascade numbers 1, 2 and 3. The Middle Dam was first, completed in 1908. It is tall; long; and holds . The Lower Cascade Dam is an earthfill embankment dam with a central concrete core which was completed in 1926. It is high; long; and holds . The Upper Cascade Dam is another earthfill embankment dam, built in 1938. It is high; long; and it holds . Middle Cascade Dam is a "Darley-Wade" dam named after the series of dams designed by L.A.B Wade, a prominent dam engineer of the era and CW Darley who designed the first constant radius thin-arch dam in Australia (Lithgow 1). It was originally constructed in 1908 as a buttress section before being raised to a constant radius arch dam to satisfy the increasing water demand of the area. Stage 1, known originally as "Katoomba Dam" was a curved buttress dam built to a height of 7.6m. The dam was built with every intent for future raising. The dam was raised by filling in the spaces of the buttresses with concrete. The right abutment consists of a gravity section to increase the effectiveness of the arch action and due to unsuitable foundations for an arch abutment. Lake Medlow and Greaves Creek Dams The heritage-listed Lake Medlow and Greaves Creek Dams were built on the Adams and Greaves Creeks respectively. Lake Medlow Dam was the first concrete thin arch, high stress dam built in New South Wales, and is one of the thinnest dams in the world. It is high; long; and holds . Greaves Creek Dam is also a concrete arch dam, it was completed in 1942. It is high; long; and holds . Sydney Water decommissioned the Greaves Creek Treatment Plant. Woodford Creek Dam Woodford Creek Dam is a concrete arch dam which was built on the junction of Woodford Creek and Bulls Creek and completed in 1928. It was subsequently raised several times. It is high and long. Water is no longer drawn from Woodford Dam. In late 2009 Woodford Dam surrounds were opened up