Açude Passagem Das Traíras is a gravity dam reservoir located on the Rio Seridó, within the Piranhas-Açu river basin, situated on the boundary of the municipalities of São José do Seridó, Jardim do Seridó, and Caicó in the Seridó region of Rio Grande do Norte. Completed in 1994, the dam is a roller-compacted concrete structure standing 25.5 meters high, with a total storage capacity of approximately 49.7 million cubic meters and a maximum operational water level of 193.32 meters. It is the fourth largest reservoir in the Seridó region.

The reservoir's designated uses include water supply for the urban areas of Jardim do Seridó and northern Caicó, irrigation, flood control, fish farming, and recreational activities. The name refers to the traíra, a fish common to the Caatinga biome.

Paddlers should be aware of a significant safety history associated with this structure. Beginning in 2015, inspections by SEMARH/RN and the Agência Nacional de Águas (ANA) identified precarious structural conditions in the dam. In 2017, a safety water level of 185 meters — corresponding to roughly 6% of total capacity, or approximately 3 million cubic meters — was established to reduce rupture risk. In April 2018, ANA formally directed SEMARH/RN to open the reservoir's valves to maintain this safety level. Repair and rehabilitation works on the dam structure and hydromechanical equipment were ongoing as recently as 2024. Anyone planning to paddle this reservoir should verify the current structural status and any operational restrictions with SEMARH/RN before visiting, as water levels may be managed well below full capacity and access could be subject to safety-related limitations.