Construction work damages endangered crayfish habitat in Leppävirta, agency to compensate

A subcontractor’s machinery disturbed a stream on a roadwork site in Leppävirta, North Savo, causing sediment to cloud the water and threaten a population of highly endangered freshwater crayfish, Yle reports.

The Finnish Transport Agency (Väylävirasto) has acknowledged the error and confirmed that all parties involved were aware of the crayfish presence before tree clearing began. The agency stated that the stream crossings were performed by a subcontractor, though the cause of the incident remains unclear.

Freshwater crayfish require clear water to survive, and increased turbidity can suffocate them. The species is highly sedentary and will not flee degraded conditions. If the population is lost, recovery could take several years, according to Hannu Viitanen, chair of the local fishing area cooperative.

The Transport Agency will investigate the extent of the damage and begin negotiations with the water area’s cooperative on compensation and restoration measures. Future bridge construction and stream realignment plans will incorporate stricter protections for crayfish habitats.

A permit application for the upcoming work is under review by the Finnish Licensing and Supervision Authority, with a decision expected by early autumn.