Case study:Dam removal in River Stenån

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Location: 57° 8' 43.61" N, 12° 29' 31.94" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Sweden
Main contact forename	Katarina
Main contact surname	Vartia
Main contact user ID
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Contact organisation web site
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Parent multi-site project
This is a parent project encompassing the following projects	No

Stenån River Valley (photo.Outi Laamanen)

Project summary

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Dam was removed in the River Stenån to help the salmon and other migratory fish to swim upwards the stream. Also other measures to impove fish migration and reproduction has been made by biotope improvements. Wood depris and rocks and gravel has been added to stream bed. Now the stream meanders and flows through a lovely maple forest. Also the stream and lakee in the Stenån water system are acidified and limed since 1986.

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Image gallery

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(photo. Maria Arola)

Removed dam (photo. Outi Laamanen)

Another removed dam, downstreams (photo. Maria Arola)

Meandering stream (photo. Maria Arola)

(photo. Maria Arola)

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Stenån-Hovgårds kvarn WFD water body codes WFD (national) typology WFD water body name River Stenån Pre-project morphology Embanked Reference morphology Desired post project morphology Heavily modified water body No National/international site designation EU - Special Protected Area Local/regional site designations Natura 2000 Protected species present Yes Invasive species present No Species of interest The freshwater pearl mussel, Salmon Dominant hydrology Dominant substrate River corridor land use Intensive agriculture (arable), Woodland Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information