Argentina and Brazil have restricted access to major attractions at Iguazu Falls after heavy rainfall drove the Iguazu River to its highest flow of 2026, forcing park authorities to close exposed walkways, trails and viewing areas.
On the Brazilian side, the river reached 11.8 million liters per second on Monday, Oct. 12, according to Urbia+Cataratas, the concessionaire that manages visitor access at Iguazu National Park. The volume was nearly eight times the river’s usual flow of 1.5 million liters per second. By Tuesday, the flow had eased to 10.5 million liters per second, but the concessionaire warned it could rise to 13 million in the following hours.
The restrictions differ between the two national parks. Brazil has closed its main walkway toward the falls and several other attractions, while Argentina has limited access to specific circuits and trails as conditions change.
Which attractions are closed in Argentina and Brazil?
On the Argentine side, authorities temporarily closed tourist access on Monday as the river rose, then reopened the park with restrictions. A route-by-route notice published by the Iguazu Argentina operator at 2 a.m. on Wednesday, Oct. 14, listed the Devil’s Throat circuit as closed because of the rising river and the Green Trail as closed because of weather conditions. The operator listed the other circuits as operating normally, although separate local reporting described restrictions affecting the Upper and Lower circuits. Visitors should check official updates before setting out because access conditions can change as the river rises.
(@cronistaespana)In Brazil, the main walkway that takes visitors closer to the falls has been closed since Sunday, Oct. 11, when the river’s flow reached about 8.8 million liters per second. On Tuesday, workers removed its protective railings to allow water to pass more freely and reduce resistance against the structure.
The Brazilian park also closed the São João Circuit and Espaço Usina. Staff removed furniture from Espaço Usina to prevent damage, while the lower viewpoint at Espaço Naipi was closed. Park authorities kept the Cataratas Trail open, allowing visitors to access part of the park during the high-water event.
How does the park respond to high water?
The Brazilian park follows a safety protocol that links access restrictions to the river’s flow and whether it is expected to keep rising. The main walkway closes when the flow exceeds 8.5 million liters per second and continues to increase. When the flow reaches between 9 million and 12 million liters per second and is still rising, crews remove the railings to help water pass through the area.
Removing the railings does not mean the walkway is safe for public use. Reopening depends on the flow falling to 8.5 million liters per second or below, a technical assessment and authorization from a specialized engineer. Teams monitor the river hourly during periods of elevated flow.
The latest surge followed heavy rainfall across Paraná and the wider river basin. Given rapid water level fluctuations, park managers evaluate each trail, site and facility individually instead of assuming all visitor zones carry the same level of risk.
What role could El Niño play?
The rainfall has drawn attention to the expected 2026–2027 El Niño, a climate pattern associated with unusually warm surface waters in the central and eastern tropical Pacific. El Niño can alter rainfall patterns across South America, although its effects vary by location and season. Reports have linked the current weather to the climate pattern, but the available evidence does not establish how much El Niño contributed to this particular river surge.
Argentine authorities had taken preventive action before the latest rise. In September, the National Parks Administration said crews had dismantled the Devil’s Throat circuit walkways in August to protect infrastructure and visitors from high water. Other attractions and services were operating normally.
The event underscores the need for preparations that account for sudden changes in river levels. Park managers must assess water conditions and the safety of exposed infrastructure before allowing visitors to return to affected areas.
Urbia+Cataratas has not announced when the Brazilian park’s main walkway will reopen. The concessionaire’s protocol requires the river to fall to the specified threshold before technical staff inspect the structure and authorize access. Until then, the Cataratas Trail remains the principal confirmed walking route available on the Brazilian side. In Argentina, visitors should consult the park’s latest circuit-by-circuit notice before planning their visit.