The South Street Bridge is a historic Pratt truss bridge, carrying Vermont Route 31 across the Poultney River just south of the village center of Poultney, Vermont. Built in 1923, it is one of a small number of surviving Pratt through trusses in the state, and one of just three that survives from the period before the state's devastating 1927 floods. It was listed on the National Register of Historic Places in 2009 as Bridge 4.