Koivusaari

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Koivusaari island

Koivusaari (Finnish: [ˈkoi̯ʋuˌsɑːri]; Swedish: Björkholmen; literally the "Birch Island") is an island and a part of the district of Lauttasaari in Helsinki, Finland. The island hosts two yacht clubs and a former Nokia training centre. The current island of Koivusaari has been formed by combining the island of Koivusaari proper with the island of Leppäsaari to the south of it and expanding it. Since the late 1990s and early 2000s there have been plans to construct a new residential area on reclaimed land in Koivusaari, served by the Koivusaari metro station.

Koivusaari is the westernmost district of the entire southern part of Helsinki. Directly west from it is a bridge across the Keilalahti bay, crossing the municipality border to Espoo, after which comes Keilaniemi, the easternmost district of southern Espoo.

Koivusaari metro station is a Helsinki Metro station since the Länsimetro extension 2017. It is Helsinki's westernmost metro station.

The surface area of Koivusaari is about 13 hectares[1]:48 and it has a coastline of 1.7 kilometres.[2]:10 Mainly consisting of reclaimed land, the island is fairly low, and its highest points only rise about seven metres above sea level. There originally were two islands at the site of the current island of Koivusaari: the northern island of Koivusaari and the island of Leppäsaari (Swedish: Alholmen) to the south of it. The soil in the islands mainly consists of till, and they have been joined with reclaimed land, with a thickness of 1 to 3 metres between the islands. There are some small smooth cliff areas on the western part of Koivusaari. The islands of Koivusaari and Lauttasaari are located in an area of acidic minerals, and the cliffs in Koivusaari mainly consist of granite.[2]:22–23

The natural flora in Koivusaari are of the fresh soil blueberry type. The trees on the island consist of species in a mixed forest; mainly birch and pine. There are reeds on the northeastern and northwestern parts of the islands, and there are small lawn and bush areas on the built parts of the area. There is a small natural outcrop and meadow beach on the southern tip of the island with a diverse selection of coastal flora. The natural value of the area was already noticed in a 1991 study.[2]:22–23 The coastal meadow with a size of 0.1 hectares on the southern tip of the island was protected under the 2001 nature protection law.[3]:17 The flora in the southern tip includes grassleaf orache, Atriplex longipes, tall fescue, bearded couch, sand ryegrass, sea milkwort, silverweed, Silene vulgaris, bird's-foot trefoil, purple moor-grass, Odontites litoralis as well as lesser and greater centaury.[2]:22–23

The vertical granite boulder at the southern tip of the island is one of the largest boulders in Helsinki. The boulder is 5 metres tall and has an area of 8.5 × 4.5 metres (previously 6 metres, parts of the boulder have fallen off). It has been classified as a prominent landscape element with nature protection value.[4]

History

The islands of Koivusaari (Björkholm) and Leppäsaari (Alholmen) at the Senate Atlas of Finland.

There used to be two islands at the site of the current island of Koivusaari: the northern island of Koivusaari and the southern island of Leppäsaari. On a Russian topographical map made from 1902 to 1911 there were fisher settlements on Koivusaari. The islands of Koivusaari and Lauttasaari belonged to the municipality of Huopalahti, which was annexed to the city of Helsinki in early 1946. The eastern part of Koivusaari had already been filled with reclaimed land at the time, and it had been connected to Leppäsaari with a causeway. The street Jorvaksentie, opened for traffic in 1935 was built to pass through Koivusaari. This traffic connection led to the area being used as a landfill until the 1952 Summer Olympics, when the landfill was covered with soil. The landfill was located to the south of the highway. The area was used as landfill both by companies and by the Finnish Defence Forces, whose army boots and ammunition were found in the area during construction of electrical wire support beams.[3]:11

Until the widening of Länsiväylä in the 1960s, the southern part of Koivusaari was owned by the plumbing company Radiator, which had a workshop and a storeroom on the island. During the time of the company, toxic waste was dumped on the coast near the pier of the Finnish Sauna Society and pitch barrels were dumped on the middle part of the island. The city of Helsinki filled the island area with clay sludge and with reclaimed land made from the remains of buildings destroyed in the war. The island hosted a paint storehouse of the Nikator construction company, a junkyard with its storeroom and the companies Huber Oy and Transporter Oy. A-Elementti Oy had a temporary showroom in the area.[3]:11

In 2003, the island hosted the boating companies Selboat Oy and Flipper Market, the maritime branch of the exercise department of the city of Helsinki and the yacht clubs Nyländska Jaktklubben and Koivusaaren Pursiseura.[5]

Zoning

References

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