| Nidelva | |
| Pushpin Map: | Trøndelag#Norway |
| Pushpin Map Caption: | Location of the river |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type2: | County |
| Subdivision Name2: | Trøndelag |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Trondheim |
| Length: | 30km (20miles) |
| Discharge1 Avg: | 94m3/s |
| Source1: | Selbusjøen |
| Source1 Location: | Trondheim, Norway |
| Source1 Coordinates: | 63.2582°N 10.4637°W |
| Mouth: | Trondheimsfjorden |
| Mouth Location: | Trondheim, Norway |
| Mouth Coordinates: | 63.4438°N 10.4147°W |
| River System: | Nea-Nidelvvassdraget |
| Basin Size: | 3118km2 |
| Ports: | Trondheim |
Nidelva is a river in Trondheim Municipality in Trøndelag county, Norway. The name of the 30km (20miles) long river translates to "the River Nid" since the suffix elva or elven is the Norwegian word for "the river".[1] [2]
The Nidelva starts at the Hyttfossen waterfall which rises from Bjørsjøen, a small lake located just below Selbusjøen, the largest lake in the southern part of Trøndelag County. The Nidelva runs north through Klæbu, then to Tiller, and then through the city of Trondheim before reaching Trondheimsfjord by the island of Brattøra near Trondheim Central Station. The Nidelva is at its deepest at the Trongfossen, a deep ravine in the village of Klæbu. There are six hydro-electric power stations along the river. The Nidelva forms the last part of the Nea-Nidelvvassdraget watershed. The Nea River is a tributary which empties into Selbusjøen, which in turn flows into the Nidelva.[3]
The popular Norwegian waltz, Nidelven Stille og Vakker du er (English: "Nidelven quiet and beautiful you are"), was written by composer Oskar Hoddø (1916–1943). According to tradition, Hoddø wrote the waltz about the Nidelva River one night in late April 1940 while he was standing at Gamle Bybro in Trondheim.[4]