Crotty Dam

Crotty Dam
Crotty Dam at right, above King River gorge, Mount Jukes at left
Location of the Crotty Dam in Tasmania
Country	Australia
Location	West Coast Tasmania
Coordinates	42°09′35″S 145°37′00″E / 42.15972°S 145.61667°E / -42.15972; 145.61667Coordinates: 42°09′35″S 145°37′00″E / 42.15972°S 145.61667°E / -42.15972; 145.61667
Purpose	Power
Status	Operational
Opening date	1991 (1991)
Owner(s)	Hydro Tasmania
Dam and spillways
Type of dam	Embankment dam
Impounds	King River
Height	83 metres (272 ft)
Length	245 metres (804 ft)
Width (crest)	300 millimetres (12 in)
Dam volume	770×10^3 m3 (27×10^6 cu ft)
Spillways	1
Spillway type	Controlled and uncontrolled
Spillway capacity	245 m3/s (8,700 cu ft/s) chute on dam face 190 m3/s (6,700 cu ft/s) valve in tunnel
Reservoir
Creates	Lake Burbury
Total capacity	1,081,420 ML (38,190×10^6 cu ft)
Active capacity	1,065,000 ML (37,600×10^6 cu ft)
Catchment area	559 km2 (216 sq mi)
Surface area	53,250×10^3 m2 (573.2×10^6 sq ft)
Power station
Name	John Butters Power Station
Coordinates	42°09′21″S 145°32′04″E / 42.15583°S 145.53444°E / -42.15583; 145.53444
Operator(s)	Hydro Tasmania
Commission date	1992 (1992)
Type	Conventional
Hydraulic head	184 metres (604 ft)
Turbines	1 x 144 MW (193,000 hp) Fuji Francis turbine
Installed capacity	144 megawatts (193,000 hp)
Capacity factor	0.9
Annual generation	576 gigawatt-hours (2,070 TJ)
Website hydro.com.au/energy/our-power-stations/king-yolande

The Crotty Dam, also known earlier as the King River Dam, is a rockfill embankment dam with a controlled and uncontrolled spillway across the King River, between Mount Jukes and Mount Huxley, located in Western Tasmania, Australia.

The impounded reservoir is called Lake Burbury.

The dam was constructed in 1991 as part of the King River Power Development Scheme, by the Hydro Electric Corporation (TAS) for the purpose of generating hydro-electric power via the John Butters Power Station located 8 kilometres (5.0 mi) below the dam wall.

The Crotty Dam, together with the Darwin Dam, are two major dams that form the headwaters for the King River Hydroelectric Power Development. The dam is located in the upper reaches of the King River gorge where the river breaks through the West Coast Range. It captures the high rainfall in the catchment of the King River and allows diversion of water through a tunnel to the John Butters Power Station downstream of the dam.

The Crotty Dam wall, constructed with 770 thousand cubic metres (27×10^⁶ cu ft) of concrete faced rock and gravel fill core, is 83 metres (272 ft) high and 245 metres (804 ft) long. At 100% capacity the dam wall holds back 1,081,420 megalitres (38,190×10^⁶ cu ft) (43,000×106 cu ft) of water. The surface area of Lake Burbury is 53,250 hectares (131,600 acres) and the catchment area is 559 square kilometres (216 sq mi). The single uncontrolled and controlled spillway is capable of discharging 435 cubic metres per second (15,400 cu ft/s).