Winooski Street Bridge, officially known as Building 31, is a historic bridge spanning between Duxbury and Waterbury, Vermont. It spans 208 feet long over the Winooski River. Much of the bridge is original today.

The Winooski Street Bridge was built in 1928 with steel produced by the Bethlehem Steel Corporation. It is one of two heavily trafficked bridges across the Winooski River in Waterbury. Bridge 31 serves as the primary route for residents of rural Duxbury to travel to the center of Waterbury village and the nearby interstate corridor from the west. L. H. Shoemaker created the initial blueprints for the bridge, which were dated March 17, 1928, and Arthur Bishop, chief bridge engineer for the Vermont Agency of Transportation, gave his approval.

Since its rehabilitation in 1997, the bridge has maintained a high level of integrity in terms of its location, design, setting, materials, workmanship, feeling, and associations. According to the Vermont Historic Bridge Program’s Preservation Plan for Metal Truss Bridges, the building will continue to be used as a highway bridge for generations to come. It received the great honor of being listed in the National Register of Historic Places on August, 9, 2006. Winooski Street Bridge can be found on the NRHP by its reference number 06000703.