Washington State Department of Transportation — I-90 Snoqualmie Pass East Project, Phases 1 and 2A

The Snoqualmie Pass is one of three major cross-mountain passes and is a crucial freight corridor and transportation network for Washington State. The Washington State Department of Transportation knew that in order to address the projected traffic growth, improve safety, and consider the environmental impact on a 15-mile stretch of Interstate 90 that an innovative solution was needed. This $564 million project took a collaborative approach in order to keep the environment as a top priority. Working with resource agencies, WSDOT put together an advisory group from the various agencies to ensure that their needs would be met. WSDOT also worked with biologists to identify and construct structures that connected wildlife habitats as well as provide a safe passage for them to move under or over the interstate, while ensuring the safety of drivers by reducing collisions with animals.