Barragem do Estreito is a reservoir located in the rural zone of Francisco Macedo, in the southern interior of Piauí, Brazil, situated between the municipalities of Francisco Macedo and Padre Marcos. Completed in 2007, the dam has a storage capacity of approximately 23.9 to 26 million cubic meters of water and extends roughly 7 kilometers in length, making it a substantial body of water for the region.

The reservoir is fed primarily by the Rio Curimatá, supplemented by smaller streams and açudes in the surrounding area. It serves as the water supply for the neighboring city of Padre Marcos. The dam wall features a central spillway, and when the reservoir reaches maximum capacity, water overtops this structure in a visually striking overflow — an event that has occurred multiple times since the dam's inauguration, drawing large crowds of visitors from across the microrregião de Picos.

The reservoir has established itself as a notable tourist destination in the area. The shoreline supports commercial activity including bars, snack stands, and small businesses, and the Tibungo Park Aquático is located nearby. The site attracts swimmers and anglers in addition to general visitors, indicating that the water is used for recreational contact. The area around the dam can experience significant vehicle and pedestrian traffic, particularly when the reservoir is at or near full capacity.

Paddlers should be aware that when the dam overtops, the overflow can flood portions of the adjacent roadway PI-243, which may affect access. The structure itself has been inspected by the Defesa Civil Estadual do Piauí and found to be free of cracks or leakage risk. The reservoir sits in the semi-arid interior of Piauí, where rainfall is seasonal and water levels can vary considerably; the dam has reached full capacity only a handful of times since 2007, suggesting that high water levels are not guaranteed year-round. The rainy season in this region typically drives water levels up, while extended dry periods can reduce the reservoir significantly.

Paddling access points, launch ramps, and paddling-specific regulations have not been identified for this reservoir.