System Status
Nero
Finland — dam levels — latest data & analysis
of total capacity
Stored
25893.0 MCM
Total Capacity
36990.0 MCM
Last Updated
2026-04-25
System Capacity
All 15 Dams
Inarijarvi
Inarijärvi
Stored: 10500.00 MCM
Capacity: 15000.0 MCM
Saimaa
Saimaa
Stored: 6300.00 MCM
Capacity: 9000.0 MCM
Paijanne
Päijänne
Stored: 2800.00 MCM
Capacity: 4000.0 MCM
Oulujarvi
Oulujärvi
Stored: 1750.00 MCM
Capacity: 2500.0 MCM
Lokka
Lokka
Stored: 980.00 MCM
Capacity: 1400.0 MCM
Porttipahta
Porttipahta
Stored: 945.00 MCM
Capacity: 1350.0 MCM
Pielinen
Pielinen
Stored: 770.00 MCM
Capacity: 1100.0 MCM
Kemijarvi
Kemijärvi
Stored: 595.00 MCM
Capacity: 850.0 MCM
Kiantajarvi
Kiantajärvi
Stored: 301.00 MCM
Capacity: 430.0 MCM
Nasijarvi
Näsijärvi
Stored: 224.00 MCM
Capacity: 320.0 MCM
Pyhajarvi
Pyhäjärvi
Stored: 175.00 MCM
Capacity: 250.0 MCM
Ontojarvi
Ontojärvi
Stored: 175.00 MCM
Capacity: 250.0 MCM
Nuasjarvi
Nuasjärvi
Stored: 140.00 MCM
Capacity: 200.0 MCM
Vuokkijarvi
Vuokkijärvi
Stored: 119.00 MCM
Capacity: 170.0 MCM
Koitere
Koitere
Stored: 119.00 MCM
Capacity: 170.0 MCM
How to Read This Dashboard
This dashboard tracks reservoir fill levels across Finland. Each card shows a dam's current water storage as a percentage of its total capacity. The system checks for new data every six hours — some upstream sources update daily, others weekly or monthly.
What the Numbers Mean
Percentage represents how full a reservoir is relative to its maximum design capacity. MCM (Million Cubic Metres) is the standard unit for measuring reservoir volumes. Below 20% capacity, evaporation losses accelerate, water quality degrades as sediment concentrates, and extraction becomes physically harder as water levels drop below outlet pipes.
Severity Indicators
Dams are colour-coded by fill level: red (critical) means below 20% of capacity, amber (warning) indicates 20–40%, and green (healthy) means above 40%. Click any dam card to explore its full history and year-on-year comparisons.