The dam is located approximately north of . The other two storages used for Toowoomba are
Perseverance Dam and
Cressbrook Dam. Completed in 1942, the rockfill dam structure is high and long. The dam wall holds back the reservoir when at full capacity. From a
catchment area of , the dam creates an unnamed reservoir, with a surface area of at a maximum depth of when at full capacity. The uncontrolled un-gated spillway has a discharge capacity of . Cooby Dam's lowest usable storage volume was recorded at 8% in January 2010. The trial would test the re-use of recycled water into Toowoomba's drinking water supply. In 2008, an emergency
bore was used to extract water from the
Great Artesian Basin to supplement water supplies for the dam as drought conditions reduced supply to critical levels. == Recreational activities ==