1. Bridges

2. References

3. Bibliography

Stocksundet is a strait in Stockholm County in Sweden. It connects the Edsviken sea inlet, to the west, with the Lilla Värtan strait and eventually the Baltic sea, to the east. The strait also forms the border between the suburb of Stocksund in Danderyd Municipality, to the north, and the suburb of Bergshamra in Solna Municipality, to the south. The strait is approximately {{convert|2|km}} long and varies in width between {{convert|90|m}} and {{convert|250|m}}, whilst its depth varies between {{convert|6|m}} and {{convert|15|m}}.

Stocksundet is supposed to have received its name from the logs (Swedish: "stock") which used to be laid out in the water to stop invading ships in the early Middle Ages. This name then led to the place name of Stocksund, on the north side of the sound, and to the heraldry shield of the then Stocksund Municipality between 1955 and 1966.{{cite needed|reason=Looks like it has been translated by a previous editor from WP:SV, but that doesn't have a cite for this either|date=August 2017}}

By the 1400s, the road between Roslagen and Stockholm crossed Stocksundet, and by the 17th century, a ferry was provided. In 1716 the first bridge across the Stocksundet was built, principally to facilitate the movement of troops to the west in the event of an attack by Russia. Since then, there have been a total of seven bridges built across the strait.^[1]

Bridges

From west to east, the strait is spanned by a bridge for the Stockholm metro, a road bridge for the European route E18, and a bridge for the Roslagsbanan narrow gauge commuter railway. Over time there have been seven bridges across the Stocksundet:

• The first bridge was built in 1716 the first bridge was built. It was a floating bridge with a drawbridge that could be opened to allow boat traffic to pass. Despite needing frequent repairs, the bridge lasted until September 1824, when it was destroyed in a violent storm.^[1]{{sfn|Andrén et al.|2011|p=57}}

• In 1825-1826 a new {{convert|90|m|adj=on}} long bridge was built in five sections between stone caissons and including a swing section. The bridge was superseded as a road bridge with the opening of a new bridge in 1936, but remained in use a pedestrian and bicycle bridge until the winter of 1957/8. The land ends of the bridge are still visible, along with the bridge house.^[1]{{sfn|Stocksunds Köping|Folke Rengmark|1963|p=80}}^[2]

• In 1885 a railway bridge was constructed to carry the narrow gauge Roslagsbanan. The bridge carried a single track, and was {{convert|98|m|adj=on}} long, and comprised two fixed spans of {{convert|36.6|m}} together with a {{convert|25|m|adj=on}} pivoting span. This bridge was replaced by a new bridge, on a different alignment, in 1996, and was demolished two years later. One of the bridge piers still exists within the stait, and the land ends of the bridge are visible.^[3]{{sfn|Andrén et al.|2011|p=64}}

• Between 1934 and 1936, a modern concrete arch bridge was built a little further west than the 1826 road bridge. It had a span of {{convert|90|m}} and was {{convert|16|m}} wide, carrying two {{convert|1.5|m|adj=on}} walkways, two {{convert|2|m|adj=on}} bicycle lanes, and a {{convert|9|m|adj=on}} carriageway. This bridge had a relatively short life, and was replaced in 1990, being demolished in order to make way for its replacement.^[4]{{sfn|Andrén et al.|2011|p=59}}

• In 1978 a bridge was built to carry the extension of the Stockholm metro to Mörby centrum station. The bridge is {{convert|240|m}} long, and consists of a four-span curved concrete structure, with a navigation clearance of {{convert|13|m}}. The bridge carries twin tracks, and the line runs in tunnel at each end of the bridge.{{cite needed|reason=I translated this from WP:SV, which uses a cite of Eniro sjökort, but I cannot locate this|date=August 2017}}

• By the 1980s, the 1936 road bridge was no longer able to carry the increasingly intensive road traffic, and it was decided to replace it with two new parallel bridges for the Norrtälje road (E18) (one for north and one for south-traffic). The first of these bridges was completed in 1990, enabling the 1936 bridge to be demolished to make way for the second new bridge, which opened in 1992. The bridges have two large and one small span each, with the largest span of {{convert|122|m}}, with a navigation clearance of {{convert|12|m}}. The bridges are respectively {{convert|15.5|m}} and {{convert|19.5|m}} wide, carrying three northbound and four southbound lanes, together with pedestrian and cycle facilities.{{sfn|Andrén et al.|2011|p=59-61}}

• In 1996 a new railway bridge was built for the Roslagsbanan, located {{convert|100|m}} west of the 1885 bridge, as part of the reconstruction of the line to double track. The new alignment necessitated the relocation of Stocksund station. The new bridge was designed by architect {{ill|Laszlo Marko|sv}} and is a concrete structure with four spans. It is {{convert|215|m}} long and has a navigation clearance of {{convert|8|m}}, somewhat lower than the adjacent road and metro bridges.{{cite needed|reason=I translated this from WP:SV, which uses a cite of Eniro sjökort, but I cannot locate this|date=August 2017}}

References

Bibliography

• {{cite book |first1=Gunnar |last1=Andrén |first2=Gunnar |last2=Balsvik |first3=Marianne |last3=Bengtsson |first4=Karl Henrik |last4=Bennet |first5=Arne |last5=Elfström |title= Nya Stocksundsboken |year = 2011|publisher = Hjalmarson & Högberg Bokförlag AB |location = Stockholm |language = Swedish |isbn = 978-91-7224-146-6 |ref={{harvid|Andrén et al.|2011}}}}
• {{cite book |last1=Stocksunds Köping |last2=Folke Rengmark |title=Bocken om Stocksund |publisher=Folke Rengmark |year=1963 |language=Swedish}}

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