The Open Rivers Programme is delighted to support the successful removal of the Virtaankoski Dam, another important step forward in river restoration in Finland. The project, led by Sysmän Tainionvirta Oy, marks a significant achievement in reconnecting 8.5 km of free-flowing river habitat and revitalising the Tainionvirta River ecosystem.
About the dam
Located in the village of Virtaa, Sysmä, the Virtaankoski Dam had been obstructing the natural flow of the Tainionvirta River since the 1910s. The hydroelectric power plant, built in 1956, ceased operations in 2012 when fisheries authorities mandated the construction of a fishway before resuming electricity generation. However, this requirement was never met, and the dam remained an obstacle to fish migration.
Thanks to the collaborative efforts of environmental organisations and local stakeholders, the demolition phase has now been successfully completed. By mid-April 2025, the final restoration work will be finished, including the construction of a new bridge.
Virtaankoski dam – Mika Viitanen, Kalastus Kanava
Dam removal: a win for nature and people
The removal of the Virtaankoski Dam is a significant victory for migratory fish species, particularly the endangered Salmo trutta (brown trout) and Coregonus lavaretus (whitefish). These species rely on open waterways for spawning and survival, and the newly reconnected river will provide critical habitat for their life cycles.
Additionally, a one-hectare fry production area is being established at Virtaankoski, offering a safe and undisturbed environment where young trout can grow before embarking on their migration. This initiative is expected to boost the annual production of trout fry to 750-1,100 individuals, strengthening the population in both the Tainionvirta River and Lake Päijänne.
Virtaankoski dam demolition, January 2025 – Nino Kinnunen
Beyond fish populations, the project will have far-reaching ecological benefits. The return of benthic organisms, insects, and native vegetation will contribute to a healthier and more diverse riverine environment.
The benefits of restoring the Tainionvirta River extend to the recreation and tourism sectors, creating a vibrant natural landscape for locals and visitors alike. This aligns with the objectives of the Salpausselkä UNESCO Global Geopark and strengthens the tourism potential of the Päijät-Häme and Sysmä regions in Finland.
The success of the Virtaankoski project serves as an inspiring example for similar river restoration efforts across Europe and beyond. With each dam removal, we are moving closer to a future where free-flowing rivers thrive, supporting biodiversity, local communities, and sustainable ecosystems.
