Puente Nanay, Cable-stayed bridge in Loreto, Peru.

Puente Nanay is a cable-stayed bridge over the Nanay River, linking Bellavista-Nanay in northern Iquitos with Santo Tomás del Nanay. Its total length is 2,283.5 metres, with a 438-metre cable-stayed main span and approach viaducts. Two 80-metre concrete towers rise from the river, and the deck carries two lanes in each direction.

Construction began in 2017 under President Pedro Pablo Kuczynski and finished in 2021, coinciding with Peru's bicentennial independence celebration. The project marked a major infrastructure milestone for the Amazon region.

The bridge carries the name of the Nanay River it crosses, and its opening in November 2021 coincided with the bicentennial of Peru's independence. It forms the first stretch of the planned road from Iquitos to San Antonio del Estrecho on the Colombian border, a route long served only by river boats and ferries.

The bridge carries two lanes in each direction and is open to motorcycles, cars and heavy vehicles; the sources record no pedestrian walkway, so cross by vehicle. Its 20 m clearance over the Nanay lets river boats pass beneath. The deck runs from Bellavista-Nanay, at the end of Av. La Marina, to Santo Tomás del Nanay.

The deck rests on steel girders because Iquitos has no aggregates for structural concrete, so structural steel was used where needed despite the cost. The cable-stayed span is 438 metres long and clears the Nanay by 20 metres, letting river boats pass beneath.