Alsina Bridge, Road bridge in Nueva Pompeya, Buenos Aires, Argentina

The Alsina Bridge is a steel structure spanning the Riachuelo River with six traffic lanes and neo-colonial architectural elements at both ends. The crossing incorporates a rolling lift mechanism system that allows boats to pass through when needed.

The first crossing at this location was a wooden bridge built in the mid-19th century. The current steel structure was completed in 1938, replacing multiple earlier constructions that had served the area.

The bridge is a recurring subject in Argentine music, painting and poetry, and its monumental profile has made it an icon of the southern suburbs. It appears in tango lyrics and in paintings of the Riachuelo. The name Alsina recalls Valentín Alsina, used for two earlier crossings at the same spot; since 2015 the official name honours Ezequiel Demonty, a young man thrown into the river by police officers of the 34th precinct.

Vehicles use two ramps with a 2.75% gradient; pedestrians reach the deck by stairs, so those with reduced mobility cannot cross on foot. The single track of the former Midland Railway, now Belgrano Sur, runs beneath the provincial-side ramp. The roadway carries six 3 m lanes.

The bridge has a movable span with a 42.50 m clear opening between supports, and counterweights and deck weigh 1,410 tonnes on each span. When the bascule is open, its highest point reaches 59 m above the roadway. The fixed spans measure 65.33 m each, and the deck sits 11.5 m above the ramps.