長野大橋, Bridge of National Route 18 in Nagano, Japan

Nagano Ohashi is a continuous girder bridge carrying National Route 18 across the Sai River, linking Tsunashima in Aokijima-machi with Kawai Shinden. It is 500.3 m long and 22 m wide, with four traffic lanes and walkways on both sides.

The bridge opened on 2 November 1969, linking the Nagano Bypass at a construction cost of about 1.9 billion yen. In April 1981 the Shinonoi Bypass opened in part, connecting to the Nagano Bypass via this bridge. The Oringi Bridge toll road opened downstream in December 1996 to relieve the crossing.

This structure serves as the primary connection point between southern Nagano City and the central district, playing a central role in local mobility patterns.

The bridge is easily accessible to all vehicles and pedestrians with clear routes for both. Traffic can be heavier during peak hours, so plan accordingly if crossing during rush time.

The bridge is 500.3 m long and 22 m wide, with four lanes and walkways on both sides, standing at an elevation of 336 m. Its continuous girder structure carries National Route 18 between Aokijima-machi Tsunashima and Kawai Shinden, linking the Nagano and Shinonoi bypasses.