Case study:Restoration for fishery in the river Hammonjoki

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Location: 61° 3' 29.75" N, 25° 22' 1.05" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Finland
Main contact forename	Ismo
Main contact surname	Malin
Main contact user ID	User:Kasvio
Contact organisation
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Parent multi-site project
This is a parent project encompassing the following projects	No

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The river Hammonjoki was restored from seven different rapid sections by the end of year 2007. The source of the water in the river comes mainly from springs. Catchment area is 45 km2 and the river runs to the lake Vesijärvi. The river is highly appreciated among the fly fishers. The restoration plan was made in the Centre for Economic, Transport and the Environment of Uusimaa. Hämeen TE-Centre, The County of Hollola and the fishing ground of Lake Vesijärvi funded the project and there were plenty of volunteers working in the river during restoration work.

Previously the connectivity of the river was blocked by an old mill dam. The old dam is protected by the ‘National Board of Antiquities and Historical Monuments’ and it was not permitted to take it down totally, but it was possible to explode a hole into the dam to enable the fish migration. The bypass was constructed to the rapid section year 2007.

The river Hammonjoki inhabits populations of e.g. brown trout, brook trout, grayling and brook lamprey. It is the only river in the catchment area of Lake Vesijärvi where the trout can migrate to. The water quality is the best in the regoin because most of the water is produced through the springs. Brown trout is the only natural salmonid species of the river and is mainly found from the lower parts of the river. Brook trout is the most common species and abundant in the whole river, also in the small headwaters. Brook trout population originates from the fish farm upstream (Hatsina) stockings made in 1960´s. Recently there has also been seen stocking of rainbow trout for fisheries. The river Hammonjoki has had a distinct fishing section for fly fishing since 1990´s.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology 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 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