South Tenth Street Bridge, most often called the Tenth Street Bridge, but officially dubbed the Philip Murray Bridge, is a suspension bridge spanning the Monongahela River in Downtown Pittsburgh, Pennsylvania. It is the only cable suspension bridge in Allegheny County and its main span is the longest span on the Monongahela River. The bridge was renamed on Labor Day 2007 for Philip Murray, the first president of the United Steelworkers of America. The bridge was built in 1931–33 and connects South Tenth Street on the South Side to Second Avenue and the Armstrong Tunnel under the Bluff. A staircase leads from the northern terminus of the bridge up to the campus of Duquesne University on the Bluff. In 2015, the bridge was one of 3 bridges to have bike specific lanes installed. It was listed on the National Register of Historic Places in 1986. Description The Tenth Street Bridge is long and has a main span of . It is the only conventional cable suspension bridge in Allegheny County, unlike the Three Sisters which use eyebars instead of cables. The two cables, each in diameter, are anchored in concrete vaults at either end of the span and travel over two towers resting on stone piers. Suspender cables, arranged in pairs which are spaced apart, transfer the load of the bridge deck to the main cables. There are 28 sets of suspender cables on the main span and 10 on each side span. The towers and railings are decorated with Streamline Moderne details, attributed to architect Stanley Roush. The bridge superstructure is painted in the signature "Aztec Gold" color used on several other downtown bridges in Pittsburgh. History First bridge A private toll bridge connecting what was then the borough of Birmingham to Pittsburgh at McKee Street (now South 10th Street) was first proposed by the Birmingham Bridge and Road Company, incorporated in 1837. The company also had license to construct a turnpike along Denman Street (South 12th Street) extending to the Monongahela and Coal Hill Turnpike (modern day Arlington Avenue and William Street). The project languished for many years until the company was reincorporated as the Birmingham Bridge Company in 1853, having fully abandoned plans to construct the turnpike. The company completed a three-span, covered wooden lattice truss bridge in 1859. In 1896, the city of Pittsburgh purchased the bridge for $305,000 and abolished the 1-cent toll. Second bridge The