Orkla (river)

Orkla^[1] is a river in Trøndelag and Innlandet counties in Norway. At 180 kilometres (110 mi) in length, it is the longest river in Trøndelag county. The river follows the Orkdalen valley, discharging into the Orkdal Fjord, an arm of the large Trondheimsfjorden, at the town of Orkanger.^[2]

Orkla
The mouth of the river at Orkanger
Interactive map of the river
Location
Country	Norway
Counties	Trøndelag, Innlandet
Municipalities	Oppdal Municipality, Orkland Municipality, Rennebu Municipality, Tynset Municipality
Physical characteristics
Source	Orkelsjøen
• location	Oppdal Municipality, Trøndelag
• coordinates	62.5102°N 09.8775°E / 62.5102; 09.8775
• elevation	1,058 metres (3,471 ft)
Mouth	Orkanger
• location	Orkland Municipality, Trøndelag
• coordinates	63.31927°N 09.841218°E / 63.31927; 09.841218
• elevation	0 metres (0 ft)
Length	179 km (111 mi)
Basin size	3,053 km2 (1,179 sq mi)
Discharge
• average	67.27 m3/s (2,376 cu ft/s)
Basin features
River system	Orkla
Tributaries
• left	Inna, Byna, Grana, and Resa
• right	Ya and Svorka

The river originates in the lake Orkelsjøen, a small lake (2.2 km² (0.85 sq mi)) near the watershed with the river Unna in the Glomma river system, in Oppdal Municipality in the Dovrefjell mountains. The river runs through Oppdal Municipality, Tynset Municipality, Rennebu Municipality, and Orkland Municipality. The municipalities are all in Trøndelag county, except for Tynset Municipality, which is in Innlandet county. Major towns and villages along the river include: Orkanger, Fannrem, Vormstad, Svorkmo, Storås, Meldal, Å (in Orkland Municipality); and Voll and Berkåk (in Rennebu Municipality).^{[citation needed]}

Orkla is a popular river for salmon fishing and the fourth largest in Norway by volume.^[2] About an 88-kilometre (55 mi) long stretch of the river through Orkland Municipality and Rennebu Municipality is used for salmon fishing throughout the season which typically runs from 1 June through 31 August.^[3]

The river is regulated by five power generation reservoirs, which were built between 1978 and 1985. The reservoirs have been a successful method of flood control preventing the river's major seasonal flooding.^[2] The decommissioned Eidsfossen Power Station stands along the river south of the confluence with the Ya River at Yset.^[4]

Name

The Old Norse form of the name was just Ork (still found in the names Orkanger, Orkdal, Orkland) and Orkelsjøen. The meaning of the name is unknown (maybe derived from the old Norse verb orka which means "to work" - the meaning of the name would then be "the river that works its way forward"). The name Orkla (with the diminutive ending -la) originally belonged to the uppermost part of the river (lying in Tynset Municipality, Innlandet), and the meaning of this name is probably "the small part of Ork".^[2]

See also

• List of rivers in Norway