The Alaska Way Viaduct is an elevated portion of Washington State Route 99 that runs through downtown Seattle and the industrial area just south of downtown. The viaduct is aging. In addition, it experienced damage in the Nisqually earthquake of 2001. As a result, it requires frequent inspection and maintenance to insure safety.
On October 18, 2008, during a planned semi-annual inspection, the Washington State Department of Transportation, King County and the City of Seattle hosted a hard hat tour of a portion of the structure.
Replacement options for the Alaska Way Viaduct are currently under review.