Burnside Bridge, Bascule bridge in Old Town Chinatown, Portland, US

Burnside Bridge is a 1926 bascule bridge carrying Burnside Street across the Willamette River in Portland, Oregon. Designed by Ira G. Hedrick and Robert E. Kremers with a lifting mechanism by Joseph Strauss, it has a concrete deck, a 251 ft center span, and Italian Renaissance towers with decorative metal railings.

The first Burnside Bridge, a wrought-iron and steel swing-span truss, opened on July 4, 1894. Its 1926 replacement was part of a $4.5 million bond; a contract scandal led to the recall of three Multnomah County commissioners. The new bridge opened on May 28, 1926, and was listed on the National Register of Historic Places in November 2012.

Burnside Street was renamed in 1891 after Daniel Wyman Burnside, a businessman who backed the 1866 dredging of the Willamette. The Portland Saturday Market, held mostly under the bridge's west end for years, was reoriented in 2009 but still shelters a few vendor stalls at its north end. The unauthorized Burnside Skatepark occupies the space under the east end.

The bridge carries Burnside Street with three TriMet bus routes; one of its six lanes was removed in 1995 for bicycle lanes. It is designated a Regional Emergency Transportation Route, the only non-freeway bridge used by emergency vehicles. Stairs added with the Eastbank Esplanade (2001) connect to the riverbank path, and the stairways rest on separate pilings because the bridge cannot bear extra weight.

Hidden inside the piers are massive counterweights that balance the structure when it opens. These concealed mechanical components make it one of the heaviest of its kind in America.