Third Street Railroad Trestle, Railway bridge in downtown Austin, United States.

The Third Street Railroad Trestle is a wooden railway bridge in downtown Austin that spans Shoal Creek with eleven sections supported by twelve supporting posts. The entire structure uses pressure-treated pine timber and features an open-deck design.

The bridge was built in 1922 by the International-Great Northern Railroad to replace an earlier structure from 1876 that served Austin's first railway connections. This new bridge was part of modernizing the railroad network in the region.

The trestle carried all freight traffic into Austin's downtown warehouse district and all passenger trains to the depot at Third and Congress. Its rails now stop at the creek banks, the rest of the line having been removed during neighbourhood redevelopment. The 2021 listing cited its role in the city's economic history.

The best place to view this bridge is from Shoal Creek's bank or the street below, where you can see the wooden structure clearly. Visitors should wear sturdy shoes if exploring the area, and watch for uneven ground.

This bridge is the last remaining wooden railway bridge in downtown Austin and was added to the National Register of Historic Places in 2021. That recognition honored its value as one of the final examples of this type of construction.