Case study:Restoration of Oulujoki River

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Location: 64° 59' 59", 25° 33' 49"
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Project overview

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Status In progress
Project web site
Themes Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology
Country Finland
Main contact forename Anne
Main contact surname Laine
Main contact user ID
Contact organisation Centre for Economic Development, Transport and the Environment for North Ostrobothnia
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
projects
Merikoski fishway
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Project summary

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The River Oulujoki was former known as an excellent salmon river. In the early 1940´s started constructions of the waterpower plants and fish migration was hindered. Nowadays there are seven waterpower plants in the River Oulujoki and the whole river is harnessed for water production.

Restorations of the Oulujoki River started at 1998 as the aim of restoring the river for recreation, fishing, and tourism. Merikoski fishway was the first step towards more natural river corridor and enabling migrating fish to rise up to the lower reaches of the river. In the beginning of 2009 North Ostrobothnian and Kainuu Centres for Economic Development, Transport and the Environment and Finnish Game and Fisheries Research Institute started the project “Oulujoki fishways - planning and supportive actions” funded by European Regional Development Fund. The object was to recreate habitats and reproduction areas for trout for the whole river length. As part of this project fishway plans for six other water power plants was made.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment



Site

Name Oulujoki River
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest Salmon, Trouts
Dominant hydrology Artificially regulated
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category 100 - 1000 m³/s
Mean annual discharge (m3/s) 259
259 m³/s
259,000 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started 2009
Works started
Works completed
Project completed
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Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
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Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Hydropower, Barriers to fish migration
Hydromorphology Continuity for organisms
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Creation of fish passes, Creation of fish spawn nursing places
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

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Physico-chemical quality elements

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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



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Supplementary Information

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