Barra de Santa Lucía Bridge, Swing bridge in Montevideo, Uruguay.

The Barra de Santa Lucía Bridge is a swing structure that crosses the Santa Lucía River where it meets the bay. The central section rotates to allow ships to pass through while the rest remains open for vehicle and pedestrian traffic.

Studies for a bridge over the Santa Lucía began in 1908, when the river was still crossed by raft, and the swing bridge opened in 1925. It was designed for rail use, but the tracks laid on it were used only at the inauguration, after which it carried road traffic. A full refurbishment in 2019 repaired the turning mechanisms and removed the railway tracks.

The bridge joins Montevideo and San José departments, and since the Alfredo Zitarrosa bridge took over Route 1 traffic it carries only local traffic between Santiago Vázquez and Ciudad del Plata. On 25 January 2025 the intendentes of both departments, Ana María Bentaberri and Mauricio Zunino, led a ceremony marking its centenary.

The bridge now carries only local traffic between Santiago Vázquez and Ciudad del Plata, since Route 1 shifted to the Alfredo Zitarrosa Bridge. Its 60 m central span swings open for tall sports boats, so crossings can pause while it rotates. The deck is 540 m long, with four 45 m spans on the left bank and three 100 m spans on the right.

The bridge was designed for rail use, but the tracks laid across it were used only on the opening day in 1925; the crossing then became a road bridge. The rails stayed in place until the 2019 refurbishment, when the rotating mechanisms were repaired and the tracks finally removed.