Question: In what year was the camp opened that is between the city of Wodonga and the dam across the Murray River downstream of its junction with the Mitta River?

Context paragraphs:
Banimboola Hydroelectric Power Station: Banimboola Power Station is a hydroelectric power station on the Dartmouth Dam Regulating Pond (or Banimboola Pondage), downstream of Dartmouth Dam on the Mitta Mitta River in Victoria, Australia.  Banimboola has three turbo generators, with a generating capacity of 12.2 MW of electricity.  It is owned and operated by AGL Energy.

Mitta Mitta River: Mitta Mitta River, a perennial river and a direct tributary of the Murray River within the Murray-Darling basin, is located in the alpine district of Victoria, Australia.

Bonegilla Migrant Reception and Training Centre: The Bonegilla Migrant Reception and Training Centre was a camp set up for receiving and training migrants to Australia during the post World War II immigration boom.  The camp was set on 130 ha near the small town of Bonegilla in north east Victoria, between the Hume Dam and the city of Wodonga.  The site was a former World War II Australian Army base, and is adjacent to the current Latchford Barracks.  The camp opened in 1947 and operated until 1971, over which period it received over 300,000 migrants.  It is estimated that over 1.5 million Australians are descended from migrants who spent time at Bonegilla.

Dart River (Victoria): The Dart River, a perennial river of the North-East Murray catchment of the Murray-Darling basin, is located in the alpine region of Victoria, Australia.  It flows from the northwestern slopes of the Alpine National Park in the Australian Alps, south and joins with the Mitta Mitta River within Lake Dartmouth.

Big River (Mitta Mitta River, Victoria): The Big River, a perennial river of the North-East Murray catchment of the Murray-Darling basin, is located in the East Gippsland and alpine regions of Victoria, Australia.  It flows from the northern slopes of Falls Creek in the Australian Alps, joining with the Cobungra River near Anglers Rest to form the Mitta Mitta River.

High Country Rail Trail: The High Country Rail Trail is a 35 kilometre, part-gravel part-sealed rail trail on the northern border of Victoria, Australia.  It runs along the former Cudgewa railway line from Wodonga, along the edge of Lake Hume, to a point just east of the Mitta Mitta River, including a 600-metre bridge over Sandy Creek Inlet.  There are plans to eventually extend the trail as far as Cudgewa near Corryong.

Mitta Mitta, Victoria: Mitta Mitta is a small town in the Australian state of Victoria in the Mitta Mitta Valley.  It stands on the Omeo Highway and is 415 km from Melbourne, and is located on the Mitta Mitta River not far from Dartmouth Dam.  At the 2006 census, Mitta Mitta and the surrounding area had a population of 151.  The permanent town population is 31.

Hume Dam: Hume Dam, formerly the Hume Weir, is a major dam across the Murray River downstream of its junction with the Mitta River in the Riverina region of New South Wales, Australia.  The dam's purpose includes flood mitigation, hydro-power, irrigation, water supply and conservation.  The impounded reservoir is called Lake Hume, formerly the Hume Reservoir.  It is a gated concrete gravity dam with four earth embankments and twenty-nine vertical undershot gated concrete overflow spillways.

County of Bogong: The County of Bogong is one of the 37 counties of Victoria which are part of the cadastral divisions of Australia, used for land titles.  It is located south of the Murray River, east of the Ovens River, and west of the Mitta Mitta River.  Mount Bogong is located there, the highest mountain in Victoria.

County of Benambra: The County of Benambra is one of the 37 counties of Victoria which are part of the cadastral divisions of Australia, used for land titles.  It is located between the Mitta Mitta River in the west, and the Murray River to the north and east.  The town of Benambra is located near the southern edge.  The area of the county roughly corresponds with the Electoral district of Benambra.  Corryong is the largest town in the region.

Supporting paragraphs: Bonegilla Migrant Reception and Training Centre Hume Dam
Answer: 1947