Lake Moawhango is a small lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 located with the New Zealand Army

New Zealand Army

The New Zealand Army , is the land component of the New Zealand Defence Force and comprises around 4,500 Regular Force personnel, 2,000 Territorial Force personnel and 500 civilians. Formerly the New Zealand Military Forces, the current name was adopted around 1946...

's Waiouru

Waiouru

Waiouru is a small town in the centre of the North Island of New Zealand. It is on the North Island Volcanic Plateau, 25 kilometres south-east of Mount Ruapehu, and in the Ruapehu District....

 Training area. It is fed by tributaries running off the slopes of Mt Ruapehu, and feeds water into the Tongariro River

Tongariro River

The Tongariro River is a river in the North Island of New Zealand. It originates in the Central Plateau of the North Island where it is fed by numerous Tributaries that flow off the surrounding hill ranges and mountains such as Mount Ruapehu...

 Hydro scheme via the Moawhango Tunnel. The lake is dammed at the southern end.

Lake Moawhango contains a large population of wild rainbow trout

Rainbow trout

The rainbow trout is a species of salmonid native to tributaries of the Pacific Ocean in Asia and North America. The steelhead is a sea run rainbow trout usually returning to freshwater to spawn after 2 to 3 years at sea. In other words, rainbow trout and steelhead trout are the same species....

, and while these are easily caught, they very rarely exceed 2 lbs in size.