Nipigon River Bridge, Cable-stayed road bridge near Nipigon, Ontario, Canada

The Nipigon River Bridge is a cable-stayed crossing of the Nipigon River near Nipigon, Ontario, carrying Highway 11 and Highway 17. Its two parallel spans hold four lanes in total, the first cable-stayed design of its kind in Ontario. Two pale tan concrete pylons rise above the deck, each edged with a row of small dark rectangular recesses, and thin white cables fan diagonally from their upper sections to the roadway.

A steel deck truss bridge was built here in 1937 beside a Canadian Pacific Railway crossing; it was replaced in 1974 by a steel plate girder structure. Work on the cable-stayed replacement began in 2013 as a $106 million project, and the first span opened on November 29, 2015. The second span was completed in 2018, giving two lanes in each direction.

The bridge carries Highway 11 and Highway 17, the Trans-Canada Highway, over the Nipigon River. Its name comes from the river and the nearby town of Nipigon. The crossing is a single point of failure in Canada's National Highway System: when it closed in January 2016, traffic between eastern and western Canada had to detour through the United States.

The bridge carries Highway 11 and Highway 17 as part of the Trans-Canada Highway, with two lanes in each direction since late 2018. The 1974 crossing it replaced had a pedestrian walkway added on its north side during mid-2000s rehabilitation; check locally for current foot access on the cable-stayed spans. The nearest town is Nipigon, Ontario.

The January 10, 2016 failure began with 40 bolts of 22 mm diameter holding a main deck girder to the northwest bearing; all failed progressively under loads beyond their capacity. The closure severed Canada's road network for 17 hours, and 200 metric tons of concrete Jersey barriers were set on the deck to weigh it down.