Commenced in 1949 and completed in April 1953, the Rocky Creek Dam is a minor dam located in the Northern Rivers region of New South Wales, situated approximately north of Lismore. The dam is the principal component of the Rous County Council bulk supply network for the region, experiencing population growth. The dam was built by Dayal Singh under contract to the Rous County Council. The dam wall is made up of about of rock, soil, clay and concrete and is high and long. At 100% capacity the dam wall holds back of water at
AHD. The surface area of Rocky Lake is and the catchment area is The area was once used for logging but is now has a conserved and generally pristine catchment environment. The uncontrolled spillway is capable of discharging .
Water supply Water from the lake is used as a potable water supply by Rous County Council to the region. It is the primary water source to the centres of Alstonville, Ballina, Byron Bay, Evans Head, and Lismore. Water is pumped from the lake a short distance to the Nightcap Water Treatment Plant and then this water is provided to the region generally through gravity reticulation. The water available from the Rocky Creek Dam is usually considered very reliable because of the nature of the catchment and the areas climate. However, in 2003 the water level at the dam dropped below 20% and the region was subject to severe water restrictions. Because of this it was decided by Rous County Council to augment the Rocky Creek Dam supply by developing another source on the
Wilsons River near Lismore treating it at an upgraded Nightcap Water Treatment plant at Rocky Creek Dam. The emergency Wilsons River source was completed in 2003 and the fully developed Wilsons River source and upgrade of the Nightcap Water Treatment Plant was completed in 2008. == Recreation ==