Pielinen water levels hit historic lows

Water levels in Lake Pielinen have dropped to exceptional lows this summer, with forecasts predicting a further 20-centimetre decline by late season, according to Sami Soosalu, a hydrologist at the Finnish Environment Institute.

Soosalu attributes the current conditions to a combination of drought in autumn 2024 and an unusually snow-scarce winter—the least snowy in over 60 years for Pielinen’s vast catchment area. Such water levels typically recur roughly once every 15 years. Early summer flood releases temporarily eased the situation by about 20 centimetres.

The shallow waters have exposed Kaiskunniemi, a 2.5-kilometre sand ridge near Hattusaari village in Loma-Koli, which locals use as a natural gauge for the lake’s level. The ridge, aligned with the Koli fell range, extends underwater nearly as far as Nurmes. At its base, a shallow stretch known as Kaiskun katkeama—usually submerged by over half a metre—now lies dry, forcing visitors to wade across when water is high.

Ilkka Tolvanen, chair of the Hattusaari fishing association and a longtime resident, notes the ridge’s central position in the lake makes water fluctuations highly visible. He recalls that crossings at Kaiskun katkeama often require rolled-up trousers and bare feet. This summer, vegetation like willow has emerged on the exposed ground.

Local residents have long advocated for regulated water levels to mitigate extreme swings, which can exceed 1.4 metres. Tolvanen argues that a variation of around 50 centimetres would be more manageable. Discussions on regulation have spanned decades, but no decisions have been made.

A path leads to Kaiskunniemi, flanked by deep potholes from past gravel extraction for Lieksa. The trail now features signage to protect the fragile terrain, shared with local ants. A designated fire pit has been added to prevent wildfires, and a communal kitchen allows visitors to heat meals.