Eighth Street Bridge, Road bridge over the Passaic River on the Passaic–Wallington line, New Jersey, United States

The Eighth Street Bridge is a road bridge over the Passaic River, linking Eighth Street in Passaic, Passaic County, with County Route 507 in Wallington, Bergen County, New Jersey. The 1914 Warren pony truss structure had a 282-foot total length, a 32.2-foot deck and an 85-foot Strauss bascule main span on a concrete substructure. Its 2019 replacement is 290 feet long with two lanes in each direction.

The first Eighth Street Bridge was built in 1914 as a Warren pony truss bascule span following a Strauss Bascule Bridge Company design, fabricated by F.R. Long - W.G. Broadhurst of Hackensack. It was fixed closed in 1977, its 300-ton counterweight removed after crumbling onto passing cars, and it closed permanently on July 24, 2017. A new 290-foot bridge, aided by $15 million in federal funds, was completed in August 2019.

The bridge links Eighth Street in Passaic with County Route 507 in Wallington, and Passaic and Bergen counties own it jointly. Its 1914 span followed a Strauss Bascule Bridge Company design and was fabricated by F.R. Long - W.G. Broadhurst of Hackensack. The original metal sidewalk railings survive, and the 300-ton counterweight was removed after it began crumbling onto passing cars.

The 2019 replacement carries two lanes in each direction and connects Eighth Street in Passaic with County Route 507 in Wallington. The river here lies 11.7 miles from Newark Bay, and the span is fixed, so no opening for boats occurs. The former 1914 bridge stood beside this alignment until its closure on July 24, 2017.

The 300-ton counterweight that once lifted the bascule span began crumbling onto passing cars and had to be removed; the gear sets, shafts and chain-operated manual mechanism stayed in place when the bridge was fixed shut. The State Historic Preservation Office found the structure of historical and engineering merit, listing it as ID#3426.