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275:. Increased levels of pollutants and bacteria downstream Spånga is believed to stem from stormwater pipes but no source have been identified. Increased levels of metals, particularly copper, has been reported, and minor oil discharges are rather common with negative impact on local bird life.
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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
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As most of the inflow comes from settled grounds, including industrial areas and streets, the stream contains high levels of nutrients, metals and bacteria, with sediments contaminated with oil. The river receives 1400 kg/year of
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has been documented around the Lunda
Industrial Area. No rare species of bottom fauna were found during an inventory in 1999, the stream being quantitatively dominated by a few species. Noteworthy is the gastropod
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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
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municipalities sharing the catchment area, together with the county administrative board, are collaborating to improve water quality and the areas surrounding the stream.
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before reaching two ponds in a park and receiving water from a second ditch (Nälsta dike) bringing water from residential areas at
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206:. The stream is guided under the central commercial district of Spånga through a tunnel 1.4 km long, opening out near
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industrial area, and receiving stormwater from surrounding areas. It then flows past the residential neighbourhood
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in Järfälla, the stream starts as a ditch receiving considerable amounts of stormwater from the residential area
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190:) bringing water from a golf range, industrial and residential areas. It then passes under the traffic route
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reported at
Hjulsta Water Park. As stretches of the watercourse remain ice-free during winters, it attracts
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found near the residential area Bällsta. The stream is, nonetheless, important for various birds, including
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to continue 1 km through am open grassland in it natural meandering shape past some
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431:(in Swedish). Stockholm vatten. 2007-03-01. Archived from
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246:before emptying into Bällstaviken under the bridge
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202:before reaching the ponds in the park of
182:. After a bit more than 2 km, near
142:. Flowing through the municipalities of
134:: "Stream of Bällsta/Spånga") is a small
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457:"Bällstaån - Bällstaågruppens hemsida"
18:
7:
14:
31:
117:36 km (14 sq mi)
1:
459:(in Swedish). Bällstaågruppen
226:. It then flows through the
55:Physical characteristics
75: • location
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518:Rivers of Stockholm County
109:10.5 km (6.5 mi)
85:
59:
30:
308:lesser black-backed gull
158:, the innermost part of
154:, it empties in the bay
414:Vattenprogram, p 29.5-6
254:Environmental influence
513:Geography of Stockholm
336:Geography of Stockholm
263:
405:Vattenprogram, 29.3-4
271:and 16000 kg/year of
261:
489:59.3839°N 17.8974°E
485: /
287:has been made, but
378:2010-08-20 at the
295:Valvata piscinalis
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300:black-headed gull
196:allotment-gardens
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341:Rivers of Sweden
283:No inventory of
184:Barkarby Airport
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523:Norrström basin
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380:Wayback Machine
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316:Slavonian grebe
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279:Flora and fauna
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16:River in Sweden
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450:External links
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289:greater dodder
285:aquatic plants
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228:harness racing
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170:Catchment area
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435:on 2007-09-27
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262:Bällstaviken.
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248:Löfströmsbron
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174:Flowing from
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146:, Stockholm,
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461:. Retrieved
437:. Retrieved
433:the original
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312:herring gull
293:
282:
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188:Veddsta dike
187:
173:
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160:Ulvsundasjön
156:Bällstaviken
138:in northern
127:
123:
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100:Ulvsundasjön
96:Bällstaviken
492: /
429:"Bällstaån"
304:common gull
507:Categories
480:17°53′51″E
477:59°23′02″N
463:2007-06-05
439:2007-06-05
422:References
269:phosphorus
244:Sundbyberg
180:Jakobsberg
148:Sundbyberg
114:Basin size
393:Bällstaån
373:Bällstaån
140:Stockholm
124:Bällstaån
22:Bällstaån
376:Archived
330:See also
273:nitrogen
232:Solvalla
208:Bromsten
144:Järfälla
128:Spångaån
80:Järfälla
40:Location
25:Spångaån
346:Bällsta
212:Bällsta
204:Hjulsta
132:Swedish
45:Country
351:Spånga
314:, and
242:, and
236:Rissne
230:track
224:Solhem
222:, and
220:Flysta
216:Nälsta
200:Tensta
176:Viksjö
150:, and
136:stream
106:Length
68:Viksjö
64:Source
49:Sweden
357:Notes
320:ducks
240:Duvbo
198:near
152:Solna
91:Mouth
324:teal
322:and
192:E18
126:or
98:in
509::
398:^
386:^
365:^
310:,
306:,
302:,
250:.
238:,
218:,
162:.
466:.
442:.
130:(
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