Case study:Sågarsfors

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Location: 60° 12' 59.21" N, 24° 14' 42.69" E

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Project overview

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Status	Complete
Project web site	http://www.ely-keskus.fi/fi/ELYkeskukset/uudenmaanely/Ajankohtaista/Julkaisut/julkaisusarja/2011/Sivut/Kunnostuksenvaikutuksetvuollejokisimpukkaan%28Uniocrassus%29.aspx
Themes	Fisheries, Habitat and biodiversity
Country	Finland
Main contact forename	Esa
Main contact surname	Lehtinen
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa
Contact organisation web site	http://www.ely-keskus.fi/fi/ELYkeskukset/uudenmaanely/Sivut/default.aspx
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

After restoration. Photo by Esa Lehtinen

Project summary

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The old water power mill at Sågarfors in River Siuntionjoki formed a complete obstacle for migrating fish. The dam was removed and a nature-like bypass channel was constructed to improve the conditions for migrating fish.

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Image gallery

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Before dam removal (Jukka Jormola)

Before dam removal (Jukka Jormola)

Work (Jukka Jormola)

After dam removal (Jukka Jormola)

After dam removal (Jukka Jormola)

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Siuntionjoki River Basin River basin Subcatchment River name Siuntionjoki River Area category 100 - 1000 km² Area (km2) 230 km²23,000 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Organic (i.e. Peat) Ecoregion Fenno-Scandian Shield Dominant land cover Waterbody ID Site Edit site Name Sågarsfors dam WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Ponded Reference morphology Artificial channel Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Sea trout (Salmo trutta), freshwater pearl mussel (Margaritifera margaritifera) 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 1 - 10 m³/s Mean annual discharge (m3/s) 2,8",8" is not declared as a valid unit of measurement for this property. Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 500500 m <br />0.5 km <br />50,000 cm <br /> Project started 2006/01/01 Works started 2007/09/02 Works completed Project completed 2010/12/31 Total cost category 50 - 100 k€ Total cost (k€) 100100 k€ <br />100,000 € <br /> Benefit to cost ratio Funding sources Centre for Economic Development, Transport and the Environment for Uusimaa, SYKE Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Centre for Economic Development, Transport and the Environment fo Uusimaa 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 Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Building of submerged weirs and pits, Introduction of gravel, Creation of fish passes 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