Bridge 777, Road-rail bridge in Krasnoyarsk, Russia

Bridge 777, also called Korkinsky Bridge, is a combined road and single-track railway bridge over the Yenisei in Krasnoyarsk. Its all-metal truss structure is 602 m long and 11.5 m wide, with the road deck and the rail line resting on shared piers. The piers were built for two railway tracks, but only one was laid.

Construction started in 1979 and was completed in 1984. The bridge was originally planned as a railway crossing, but during the works the decision was made to add a road deck. Classified as a strategic and even secret facility, it was kept in reserve for wartime use and not opened to traffic until around 1986. Its design number, 777, became its common name.

The bridge's nicknames come from its construction code: the project was labelled "object 777", hence "Three Sevens", and it is also called Korkinsky after the nearby village of Korkino. Until 2009 city commuter trains crossed it; a second railway track on the existing piers is now under discussion.

The bridge carries one railway track and a road deck on shared piers between the Sovetsky district side and the Leninsky district, with an exit toward Beryozovka. It is an active freight route, so access is by vehicle or train rather than a walking crossing; check conditions before planning to pass.

The bridge was built as a strategic and even secret facility: completed in 1984, it stood unused for a time, held in reserve for wartime. Its technical drawings labelled it object 777, which gave the nickname "Three Sevens". The piers were built for two railway tracks, but only one was ever laid.