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Winter Research Library

Research Partners

Clear Roads - Clear Roads is an ongoing pooled fund research project aimed at rigorous testing of winter maintenance materials, equipment and methods for use by highway maintenance crews.

Pacific Northwest Snowfighters - The group's mission is to provide specifications for the highest quality products balancing quality of environment with providing the safest possible transportation system and maximum mobility for the traveling public during snow and ice conditions, within reasonable budgetary, product performance and environmental constraints.

Mountain Pass Highways

See the most recent Snoqualmie Pass Snowfall and Closure Data.

Historical opening and closing dates for North Cascades, Cayuse and Chinook Pass.

Keeping Snoqualmie Pass Open: WSDOT and the Washington State Patrol hosted a public meeting on November 14, 2006 to discuss winter operation methods, challenges, and and our innovative approach.


Map of DOT salt price comparison and five year average use. (pdf 477kb)

Snow and Ice Plan: The Snow and Ice Plan provides WSDOT maintenance crews the guidance and direction to assist in safe, efficient and consistent operations.