The Arnold River is located in the west of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

's South Island

South Island

The South Island is the larger of the two major islands of New Zealand, the other being the more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, to the south and east by the Pacific Ocean...

. It is the outflow of Lake Brunner

Lake Brunner

Lake Brunner is the largest lake in the northwestern South Island of New Zealand, covering an area of 40 km². The lake's outflow is the Arnold River, a tributary of the Grey River. The lake lies 31 kilometres to the southeast of Greymouth...

, which it links with the Grey River. The Arnold River flows northwest for 20 kilometres, joining the Grey immediately above the town of Brunner

Brunner, New Zealand

Brunner is a town in the northwest of New Zealand's South Island. Together with Taylorville and Dobson to the south-west, it had a population of 672 at the 2006 census. It is 12 kilometres to the east of Greymouth, on the south bank of the Grey River. It is on the Midland Line railway near its...

, some 15 kilometres from the Tasman Sea

Tasman Sea

The Tasman Sea is the large body of water between Australia and New Zealand, approximately across. It extends 2,800 km from north to south. It is a south-western segment of the South Pacific Ocean. The sea was named after the Dutch explorer Abel Janszoon Tasman, the first recorded European...

. It is a popular spot for whitewater kayaking

Whitewater kayaking

Whitewater kayaking is the sport of paddling a kayak on a moving body of water, typically a whitewater river. Whitewater kayaking can range from simple, carefree gently moving water, to demanding, dangerous whitewater. River rapids are graded like ski runs according to the difficulty, danger or...

 and trout fishing.

The Arnold Power Station

Arnold Power Station

The Arnold Power Station is a hydroelectric facility fed from Lake Brunner on the Arnold River in West Coast, New Zealand, owned and operated by TrustPower. The plant is rated at 3 MW and has an average annual output of 25 GWh.- Development :...

 is located on the river close to its confluence with the Grey. TrustPower

TrustPower

TrustPower Limited is a New Zealand electricity generation and electricity retailing company, listed on the New Zealand stock exchange.TrustPower is New Zealand's fifth largest electricity generator and the fourth largest electricity retailer , serving 260,000 customers throughout New Zealand...

, which operates the current hydroelectric station, has a proposal for another hydro-electricity scheme on the river.