Project: I-90 Snoqualmie Pass East Project – Snow Avalanche Risk Evaluation for a Bridge Structure

Client: Jacobs Engineering

The I-90 Snoqualmie Pass East Project provided highway improvements to the existing 15 mile section of highway from Hyak to Easton in Washington State. This included the replacement of an old avalanche protection shed and the expansion of the highway to six lanes. Avalanche risk along this section of I-90 was mitigated with the construction of two 365 m bridges physically separating the highway from the hillside and allowing clearance beneath the bridges for avalanche flow. Dynamic provided critical conceptual information for the bridge design, delivered design specifications and was retained to provide consultation during the construction phase which was completed in the fall of 2018.