Kinnaird Bridge, Prestressed concrete road bridge in Castlegar, British Columbia, Canada

Kinnaird Bridge, officially Columbia Bridge, is a two-lane concrete road bridge over the Columbia River in Castlegar, British Columbia. It carries Highway 3 on four V-shaped supports, each made of two sets of three struts stiffened by two crossbeams, standing on massive pedestals. Two supports stand in the river and two on the shore, creating three 80-metre spans and two shorter side spans. The 365-metre deck is formed by cantilever sections on the V-supports linked by suspended girders.

The Kinnaird Bridge was completed in 1965, though some sources give 1960. It was designed by Italian engineer Riccardo Morandi, who was asked to avoid the steel truss bridges common in North America and instead proposed a concrete structure. Detailed planning was done with the Vancouver firm Choukalos, Woodburn, McKenzie. The bridge was named after the village of Kinnaird, which was incorporated into Castlegar in 1974. It underwent a major renovation between 2011 and 2012.

The bridge stands as an example of mid-20th century engineering innovation, representing a period of rapid infrastructure development in British Columbia.

The bridge can be accessed directly from Highway 3 and is open to traffic at all times. Visitors should note that this is a busy road crossing, so staying alert while on or near the structure is important for safety.

The deck rests on four V-shaped supports of three struts each, two standing in the Columbia River and two on shore, giving spans of 80 m and a 365 m roadway. The slightly bulging undersides of the deck sections soften the look of the 45 m high structure.