Bällstaån
| Bällstaån | |
| Spångaån | |
| River | |
 |
|
| Country | Sweden |
|---|---|
| Source | Viksjö |
| - location | Järfälla |
| Mouth | Bällstaviken in Ulvsundasjön |
| Length | 10.5 km (7 mi) |
| Basin | 36 km2 (14 sq mi) |
Bällstaån or Spångaån (Swedish: "Stream of Bällsta/Spånga") is a small stream in northern . Flowing through the municipalities of Järfälla, Stockholm, Sundbyberg, and Solna, it empties in the bay Bällstaviken, the innermost part of Ulvsundasjön.
Some 1,4 km of the stream is passing through culverts and long stretches of it have been straitened out to form part of the local stormwater system. Notwithstanding, other sections are furnished with promenades and ponds and therefore considered as of local recreational interest. The municipalities sharing the catchment area, together with the county administrative board, are collaborating to improve water quality and the areas surrounding the stream.
Flowing from Viksjö in Järfälla, the stream starts as a ditch receiving considerable amounts of stormwater from the residential area Jakobsberg. After a bit more than 2 km, near Barkarby Airport, it dives into a short culvert before merging with another ditch (Veddsta dike) bringing water from a golf range, industrial and residential areas. It then passes under the traffic route E18 to continue 1 km through am open grassland in it natural meandering shape past some allotment-gardens near Tensta before reaching the ponds in the park of Hjulsta. The stream is guided under the central commercial district of Spånga through a tunnel 1.4 km long, opening out near Bromsten industrial area, and receiving stormwater from surrounding areas. It then flows past the residential neighbourhood Bällsta before reaching two ponds in a park and receiving water from a second ditch (Nälsta dike) bringing water from residential areas at Nälsta, Flysta, and Solhem. It then flows through the harness racing track Solvalla where the water is used for fountains during races. Downstream Solvalla, it becomes broad with a slow flow occasionally becoming stagnant. Bällstaån finally receives water from Rissne, Duvbo, and Sundbyberg before emptying into Bällstaviken under the bridge Löfströmsbron.
...
Wikipedia