Europe's great rivers are shrinking under heat and drought, and the Danube, Rhine and Loire are showing how fast summer can redraw the continent

Europe’s major rivers are shrinking as heat and drought reduce flows, creating knock-on effects for transport, ecosystems and households. In the Netherlands, exposed sand and mud have grounded houseboats, cargo ships are running at roughly 20% capacity, and a Rhine passenger vessel ran aground near Bonn before being freed by a freighter. Mid-July, the Dutch government declared a Level 2 “actual water shortage,” shifting from flood-focused emergency planning to scarcity management, including less frequent lock operation to limit saltwater intrusion and possible changes to weirs, pumps and water withdrawals. Deltares reports the Rhine’s average July flow at Lobith hit its lowest level ever, alongside warmer temperatures increasing risks of algal blooms and oxygen loss.