Europe's rivers are drying up: Po, Danube, and Rhine at record lows in 2026

The 2026 European heatwave has pushed the Po, Danube, and Rhine rivers to historic lows, triggering nuclear plant shutdowns, crop losses in Italy's Po Valley, severe disruption to inland shipping, and a mounting energy and economic crisis that underscores Europe's vulnerability to climate-driven water stress.

Record-low water levels

• Rhine: Water levels fell to the lowest in nearly 150 years at key gauging points. At Kaub (the critical shallow chokepoint), levels dropped below 30 cm — hitting 27 cm on July 30 . Record lows were also recorded in Cologne and at Lobith on the German-Dutch border .
• Danube: Record-low levels were measured across multiple stretches from Hungary to Romania and Bulgaria, with the riverbed so exposed it revealed long-submerged relics including a mammoth skeleton .
• Po: At Cremona, the river fell to 8.59 meters below the hydrometric zero on July 30 — 1 cm lower than the previous record from the severe 2022 drought . Flow rates dropped by up to 80% .

Nuclear power plant shutdowns: Hungary and Romania

• Hungary — Paks plant: The Soviet-era Paks plant, which supplies nearly half of Hungary's electricity, was forced to largely shut down for the first time in its 44-year history because the Danube was too low to provide cooling water . Prime Minister Péter Magyar warned on July 31 that the shutdown could last weeks . By August 4, the plant came within "a few millimeters" of a complete forced shutdown overnight .
• Romania — Cernavodă plant: Low Danube levels forced Romania to shut down both of its nuclear reactors for the first time ever — the first was taken offline on July 26, the second on July 29 . The energy ministry declared a state of emergency . To keep the remaining working reactor running, Romania resorted to blasting a rock outcrop in the Danube riverbed on August 3 to redirect cooling water flow .
• At least six nuclear power plants across Europe were closed or operating at reduced output due to heat and low river levels, with at least ten reactors affected overall .

Crop disruptions in Italy's Po Valley

The Po Valley drought alert was raised to "high" on July 30, with more than 100 municipalities in Piedmont and Lombardy facing drinking water shortages, some relying on tanker trucks . Farmers reported reduced crop yields, increased irrigation demand, and severe heat stress on livestock . At Cremona, the extreme heat made the ground so hot that farmers worried seeds would die before germinating . Italy placed all 27 of its major cities on the highest heat alert on August 5 as a fourth summer heatwave baked the country .

Reduced inland shipping capacity

• Rhine: Barges were forced to sail only partially loaded, driving up freight rates sharply . Analysts said the disruptions posed a "cost and logistics threat" to Germany's fragile industrial recovery . Shallow water meant loads had to be split across multiple vessels, compounding costs .
• Danube: Similar cargo restrictions hit barge traffic across Hungary and Romania, and Romania's navy attempted to divert water from other rivers into the Danube to maintain navigability .
• S&P Global reported that the record lows at key chokepoints snarled flows of fuel, chemicals, metals, and grains along both rivers .

Broader economic and systemic infrastructure vulnerabilities

The cascading impacts — lost nuclear generation, higher shipping costs, disrupted commodity flows, and crop losses — reduced company earnings and stoked fears about the economic toll of prolonged heat and erratic rainfall . In Hungary, the government switched off decorative and non-essential lighting at all state institutions — including parliament, Buda Castle, and the Chain Bridge — to save electricity . Prime Minister Magyar called for cuts in electricity use during peak hours . The European Commission prepared to convene an emergency meeting of its Electricity Coordination Group over the crisis .

Scientists and officials across reports attributed the extreme conditions to the climate emergency, noting that Europe's river-dependent infrastructure — nuclear cooling, hydropower, industrial feedstock transport, and agricultural irrigation — was not designed for the recurrent drought and heatwave regime now emerging . The crisis is widely described as a systemic vulnerability: one climate shock simultaneously hitting energy, food, transport, and water supply across a continent.