Julius Lookout Mount Isa, Queensland, Australia
By dahumbug on 08-Jun-24. Waypoint TP13736

Trig Point used for construction of Lake Julius Lookout circa 1976

Lake Julius was formed following the construction of Julius Dam in 1976 for irrigation and town water storage. The dam wall is located just below the junction of the Leichhardt River and Paroo Creek some 70 kilometres (43 mi) North East of Mount Isa. With a catchment area of 4,845 square kilometres it has a full supply capacity of 107,500 megalitres (3,800×106 cu ft), a surface area of 1,255 hectares (3,100 acres) with an average depth of 8.9 metres (29 ft).

The dam is unique in Queensland and is a concrete multiple arch and buttress type structure, with the spillway discharging over the tops of the arches. The spillway crest is 18.3 metres (60 ft) above bed level. The arch barrels, founded on a triangular arch base, are constructed in independent arch rings and are hinged at buttress springing lines. The spillway is a precast superstructure and the dissipation slab at ground level is post tensioned to the foundation rock.

The dam has a total storage capacity of 107,500 megalitres (3,800×106 cu ft), and has a full supply level of 223.54m AHD.