Kaljasinski-Brücke, Railway and road bridge in Kalyazin, Russia

The Kalyazin Bridges are two separate crossings of the Volga on the R86 road and the Oktyabrskaya Railway, 247.5 km from Moscow South Port. Each is a three-span metal truss with a lower deck, spans of 105.5 m and 16.4 m clearance above the normal project level; the middle span is the navigable one. The road bridge stands about 1 km above the mouth of the Kashinka, hence its other name, Kashin Bridge.

The railway bridge opened in 1919 on the Kalyazin Post–195 km section of the Oktyabrskaya Railway. When the Uglich hydroelectric scheme raised the Volga's level in the late 1930s, new supports were built beside the old ones and the spans were moved onto them. The road bridge on the R86 followed in 1976–1979, designed by Lengiprotransmost and built by Mostootryad-19; it opened on 25 December 1979.

The bridges carry a second name, Kashin Bridge: the Kashinka flows into the Volga about 1 km downstream, and the Kalyazin bell tower stands 12.5 km away along the navigation channel. The navigable span is the middle one, so vessels pass between the piers under the central truss.

The bridges stand at the 247.5 km mark measured from Moscow South Port, and the navigable channel passes under the middle of the three 105.5 m spans, which rises 16.4 m above the normal design level. The railway bridge lies on the Kalyazin Post – 195 km section of the Oktyabrskaya Railway, while the road bridge carries the R86 highway. The Kashin Bridge name is also used, since the Kashinka flows into the Volga about 1 km downstream.

The bridge crosses a point in the river that is important for local boats and vessels, so the design had to provide sufficient clearance for water traffic. This makes it a special technical solution balancing transportation needs both above and below the waterway.