# Lagoa dos Patos flooding in Brazil

> Live situation record from CLSTR: https://clstr.news/situations/lagoa-dos-patos-flooding-in-brazil
> Updated: 2026-08-11T19:32:46.000Z. Sources: 2. Developments: 2.

The Lagoa dos Patos lagoon in southern Brazil experienced fluctuating water levels due to heavy rains and wind. In early August, water levels in Rio Grande peaked at 88.2 cm, exceeding the 80 cm flood threshold, before receding to 69.8 cm by mid-morning.

By mid-August, the situation escalated as water levels in Rio Grande reached 109.7 cm, nearly 30 cm above the established flood mark. While levels showed some fluctuation, authorities remained on alert due to projections suggesting further rises. In São Lourenço do Sul, municipal authorities initiated emergency structural interventions, including the construction of earth embankments to protect the Praia das Nereidas waterfront and reinforced containment works near Arroio Carahá to prevent urban flooding.

## Timeline

### 2026-08-11: Lagoa dos Patos water levels exceed flood thresholds in Brazil

Rising water levels in Lagoa dos Patos have triggered flood alerts in Rio Grande and emergency barrier construction in São Lourenço do Sul to protect coastal areas.

2 sources. https://clstr.news/cluster/lagoa-dos-patos-water-levels-exceed-flood-thresholds-in-brazil

### 2026-08-03: Lagoa dos Patos Flood Peaks Then Recedes in Rio Grande, Brazil

Lagoa dos Patos in Rio Grande, Brazil, briefly exceeded the 80 cm flood line, peaking at 88.2 cm before dropping to 69.8 cm by morning, amid heavy rains and wind influences.

2 sources. https://clstr.news/cluster/lagoa-dos-patos-flood-peaks-then-recedes-in-rio-grande-brazil

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Cite as: Lagoa dos Patos flooding in Brazil. CLSTR, https://clstr.news/situations/lagoa-dos-patos-flooding-in-brazil