Iguazú Falls closed amid flood warnings linked to El Niño

Iguazú Falls was closed because the river became exceptionally swollen after heavy rainfall. Authorities restricted movement and access to public-use areas because visitor safety could be threatened by powerful currents, rapidly changing water levels, and flooded or damaged paths. The closure also reflects the continuing release of water from upstream dams.

The river’s flow exceeded 12,000 cubic metres per second, compared with its average level. Earlier El Niño-related flooding destroyed walkways in the Devil’s Throat section. Those losses show how flooding can affect both people and infrastructure, not only the view of the falls.

The park administration did not give a reopening date. Director José María Hervás said the measure was precautionary because rain continued and dam releases were not falling. Access will depend on safer river conditions and public areas.

The Iguazú River’s flow rose above 12,000 cubic metres per second. The article says that was more than six times the river’s average level. This comparison shows the scale of the surge more clearly than the raw number alone: the river was carrying several times its usual volume.

Such a large increase matters at a waterfall because water moves with much greater force through the river and surrounding channels. The park administration and the company operating the tourist circuit therefore restricted access to public-use areas. The closure was described as temporary and precautionary.

The rise followed heavy rainfall, while water released from upstream dams was also not falling. Authorities did not specify when the site would reopen. Further rain forecasts linked to El Niño could prolong the unusually high flow and delay safe access.

El Niño raises temperatures in the tropical Pacific and changes broader weather patterns. Those changes can shift where rain-bearing systems form and move. As a result, some regions receive unusually heavy rainfall, while others become more prone to drought. The article also says El Niño can exacerbate global warming.

In Argentina, the National Meteorological Service reported excess rainfall along the coastal region. It said the pattern through September was similar to averages during strong El Niño events. Rainfall initially may be relatively small, but the service warned that it increases as the year progresses.

That matters because already-wet rivers can rise further when more rain arrives. Forecasts pointed to additional rain, while the Paraná and Uruguay rivers were also rising. The article says the strongest increases were expected during the austral summer and autumn of 2027.

The park had already experienced serious flooding during El Niño episodes in 2023 and 2024. Those floods destroyed walkways in the Devil’s Throat, or “Garganta del Diablo,” section of the tourist circuit. The damage showed that rising water could make visitor infrastructure unsafe or unusable.

This time, park authorities acted before the expected event. In August, they closed the Devil’s Throat section and removed its walkways as a precaution. They were preparing for weather similar to, or more powerful than, the earlier floods. Removing the structures reduced their exposure to flood damage.

The broader park was later closed after the Iguazú River’s flow exceeded 12,000 cubic metres per second. Heavy rain continued, and upstream dam releases were not falling. Meteorologists warned that the current El Niño could become the strongest on record, increasing concern about further impacts.

River levels at Iguazú Falls reflect water entering the river from rainfall and water being released upstream. Heavy rain increases the amount of water flowing through the basin. Dam releases can add another surge, especially when reservoirs or operators send water downstream. Both effects can combine to produce unusually powerful flows.

The park director said it “just keeps raining” and that the volume released from dams upstream on the Iguazú River was not falling. At the same time, the river’s flow exceeded 12,000 cubic metres per second, more than six times its average level. The combination explains why authorities treated conditions as dangerous.

High flow can force closures and threaten visitor infrastructure. The park had previously lost walkways during floods in 2023 and 2024. With further rain forecast and releases still elevated, access may remain restricted until river conditions improve.

When major rivers rise, water can spread into low-lying riverside communities. Residents may need to leave homes and other exposed areas. Floodwater can also disrupt transport and damage public infrastructure, although the article specifically reports evacuations rather than listing every type of damage.

The Uruguay River’s rising levels forced dozens of people to evacuate from riverside areas in Concordia, Entre Ríos province, and Paso de los Libres, Corrientes province. These evacuations show the immediate human consequence of higher water. The Paraná was also running well above normal.

The Yacyretá entity reported Paraná flows 37 percent above historical averages in September and 40 percent higher so far in October. Forecasts called for more rain linked to El Niño. If levels continue rising, more riverside communities could face evacuations and prolonged disruption.

El Niño begins with warmer-than-usual conditions in the tropical Pacific, but its effects extend through changes in atmospheric weather patterns. Those changes can influence where moisture gathers, where rain falls, and where dry conditions develop. This is why one climate pattern can affect distant regions differently.

The article links El Niño with increased risks of both droughts and floods. In Argentina’s coastal region, the National Meteorological Service reported excess rainfall similar to the average during strong El Niño events. Elsewhere, the same broad pattern can produce drier conditions rather than heavier rain.

These effects matter because they can build over time and affect rivers, communities, and ecosystems far from the Pacific. Argentina’s service warned that excess rainfall increases as the year progresses, especially during the austral summer and autumn of 2027. That raises concern about further flooding.