ETR Big Island Bridge

The ETR Big Island Bridge is a Pratt through truss bridge located near Green River, Wyoming, which carries Sweetwater County Road CN4-4 across the Green River. The bridge was built from 1909 to 1910 by contractor Charles G. Sheely. It was named the Big Island Bridge after the Big Island region of Wyoming, which the bridge connected to other parts of the state. The 352 ft, two-span bridge is one of the older Pratt through truss bridges in Wyoming, and its spans, each 155 ft long, are some of the longest on bridges of this design in the state.

The bridge was added to the National Register of Historic Places on February 22, 1985. It was one of several bridges added to the NRHP for their role in the history of Wyoming bridge construction.