Nidelva near Blakstad in Froland
|Main source||Haugsjåsund, Telemark|
|River mouth||Arendal, Aust-Agder|
|Basin size||4,000 km2 (1,500 sq mi)|
|Length||210 km (130 mi)|
Nidelva in Aust-Agder is the main river in the Arendal drainage basin. It is formed by the confluence of two rivers, Nisserelva and Fyreselv. The river flows into the Skagerrak at Arendal. The total length of the system is 210 kilometres (130 mi), the watershed covers 4,000 square kilometres (1,500 sq mi). Sixteen hydro-electric power stations are built along the river, making this one of Norway's most controlled drainage systems.
Salmon can be found 22 kilometres (14 mi) up the river, where the Evenstad power station is located. At Rygene, the average waterflow is 110 cubic meters per second (m³/s), but the highest recorded was in the autumn of 1987, with 1200 m³/s.
View of the River Nid by John William Edy
|Wikimedia Commons has media related to Nidelva, Aust-Agder.|
- Energilink.no entry on Evenstad power station (Norwegian)
- Comparing upriver spawning migration of Atlantic salmon Salmo salar and sea trout Salmo trutta A.G Finstad, F. Økland, E.B. Thorstad, T.G. Heggberget, Journal of Fish Biology, 2005
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