Case study:Restoration of Kostonjoki River

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Location: 65° 35' 20.76" N, 28° 13' 9.01" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Fisheries, Habitat and biodiversity, Social benefits
Country	Finland
Main contact forename	Jukka
Main contact surname	Tuohino
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for North Ostrobothnia
Contact organisation web site	http://www.ymparisto.fi/default.asp?node=27306&lan=fi
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Project summary

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Kostonjoki River is one of the tributaries of the River Iijoki. The River Kostonjoki was dredged for timber floating like many other tributaries of the River Iijoki. Before dredging in 1956-1958 there were 105 hectares of rapids and riffles in the Kostonjoki River. After dredging most of the riffles and rapids were destroyed and habitats of the migrating fish lost. Restorations of the Kostonjoki River took place in 2005-2012 as the aim of setting the condition of the water system closer to it´s natural state to enable the fish migration. Object of the restorations was to create pool-riffle variation, add natural water levels to rewater dried parts of the river and add stones and gravel to create habitats for migrating fish. Restorations were successful. Rapid and riffle areas of the Kostonjoki River grew 60% after restorations and densities of migrating fish increased.

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Catchment and subcatchment

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Site

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Name	The Kostonjoki River
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Pre-project morphology	Straightened, Over-widened
Reference morphology
Desired post project morphology
Heavily modified water body	No
National/international site designation
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Protected species present	Yes
Invasive species present	Yes
Species of interest	Trouts, European grayling, crabs, mussels
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Project background

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Reasons for river restoration

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Measures

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Monitoring

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Element	When monitored		Type of monitoring		Control site used	Result
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Image gallery

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Restoration of Kostonjoki River_Koitikoski torrent after restoration (photo.Eero Hiltunen)

Restoration of Kostonjoki River_Kutinkoski torrent after restoration (photo.Eero Hiltunen)

Restoration of Kostonjoki River_Kutinkoski torrent before restoration (photo.Eero Hiltunen)

Restoration of Kostonjoki River (photo: Eero Moilanen)

Restoration of Kostonjoki River_Restoration of Ala-Susikoski torrent (photo: Eero Moilanen)

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