Argentina temporarily closes Iguazu Falls after El Niño-fuelled surge in water levels

Argentine authorities temporarily closed tourist access to Iguazu Falls because intense rain caused the Iguazu River to rise rapidly. Officials feared the river could burst its banks, creating dangerous conditions for visitors. The decision was a precaution, not a permanent closure.

The closure began when river flow exceeded 12,000 cubic metres per second. That was more than six times the river’s average rate. Park director José María Hervás said it kept raining, while water released from upstream dams was not falling. Together, these conditions kept adding water to the river.

Officials later reported a gradual decline in the flow. That improvement reduced the immediate flooding risk and allowed the area to reopen to tourists on Tuesday. The episode shows how quickly rainfall and dam releases can change access to a major natural attraction.

Iguazu Falls is a vast waterfall system recognised by Unesco as one of the world’s largest and most impressive waterfalls. Its scale makes it a major natural landmark and tourist destination. The falls stretch across approximately 2,700 metres, giving visitors access to a broad series of cascades rather than a single narrow drop.

The falls sit on the border of Argentina and Brazil. The article focuses on Argentina’s Iguazu National Park, where officials control tourist access on the Argentine side. The Iguazu River supplies the water that moves through the falls and continues across the border region.

This shared location means conditions can affect tourism on both sides, although the closures mentioned involved Argentina’s park. In this case, unusually high river flow led Argentine officials to close access briefly. The reopening followed a gradual decline in the river’s volume.

A flow of 12,000 cubic metres per second describes the volume of water passing through the river every second. One cubic metre is a sizeable box of water, so 12,000 cubic metres each second represents an immense and rapidly moving amount. The figure signals unusually powerful river conditions.

The article says this flow was more than six times the river’s average rate. In simple terms, the river was carrying over six times its usual volume at that moment. Heavy rainfall drove the increase, and upstream dams were also releasing water into the Iguazu River.

Such a sharp rise matters because it can make riverbanks unstable and raise the risk of flooding. That is why park officials closed tourist access as a precaution. When the flow later began a gradual decline, officials judged that reopening was possible the next day.

When heavy rain falls quickly, rivers can receive more water than their channels and banks can safely contain. Water levels then rise fast. If the rise continues, the river may burst its banks and flood nearby land. At a waterfall and national park, that can make paths and viewing areas unsafe.

The Iguazu case shows how two sources can combine. Rain was continuing, according to park director José María Hervás. At the same time, the volume of water released from dams upstream on the Iguazu River was not falling. Those extra inputs pushed river flow above 12,000 cubic metres per second, more than six times average.

Officials closed tourist access as a precaution against these dangers. The park reopened only after the river’s flow began a gradual decline. The event demonstrates why changing river levels must be monitored closely during intense rainfall.

Iguazu National Park officials closed the Argentine side during 2023 and 2024 because flooding affected the area during a previous El Niño cycle. The closures were safety measures linked to unusually wet conditions and rising water. They show that the current disruption is part of a repeated pattern rather than an isolated event.

El Niño can bring global changes in winds and rainfall, along with erratic weather conditions. The article connects the earlier closures specifically with flooding caused by the previous El Niño cycle. In the current episode, heavy rain and water released from upstream dams pushed the Iguazu River above six times its average flow.

These earlier closures provide important context for the latest decision. Officials already had experience restricting access when flooding made the park risky. The current reopening was possible after the river’s flow gradually declined, but the repeated closures show how weather patterns can affect tourism.

El Niño is a climate pattern that begins in the equatorial Pacific. Changes in winds allow huge amounts of heat to escape from the ocean and warm the atmosphere. The pattern changes winds and rainfall around the world, often producing erratic weather conditions in distant regions.

Its effects can reach Argentina. The article reports that Argentina’s coastal region recently experienced above-average rainfall similar to rainfall seen during strong El Niño events. That extra rain can swell rivers, especially when water continues to be released from upstream dams. At Iguazu, the combined water inputs pushed flow above 12,000 cubic metres per second.

El Niño grows during the Northern Hemisphere autumn and peaks in December, but its impacts continue into the following year. This timing helps explain why a Pacific climate pattern can affect rainfall and flooding risks in Argentina. It also makes the pattern important for planning and public safety.

Human-caused global heating may influence El Niño by making these climate events more intense, according to scientists cited in the article. El Niño already changes winds and rainfall worldwide. If its intensity increases, its effects on regional weather can become more disruptive, including heavier or more unusual rainfall.

The article connects this concern with Argentina’s recent conditions. Its coastal region received above-average rainfall similar to that seen during strong El Niño events. At Iguazu, continued rain combined with water released from upstream dams. The river then exceeded 12,000 cubic metres per second, more than six times its average rate.

The article does not give a precise measure of how much global heating increases rainfall or river flow. It does state that scientists think warming is making El Niño’s more intense. That possibility matters because stronger events could increase flooding risks and lead to more closures around vulnerable places such as Iguazu Falls.