Project Safe Haven: Tsunami Vertical Evacuation Systems on Washington State's Pacific Coast [open pdf - 265KB]
From the Summary: "Washington State's Pacific coast faces the threat of large-scale earthquakes and tsunamis. To mitigate the risk, Washington is providing technical assistance to cities, counties, and tribes for construction of the Nation's first vertical evacuation structures capable of withstanding 9.0+ magnitude earthquakes and 30-foot waves. The project provides residents and visitors in coastal population centers a means of seeking safety without having to travel considerable distance to natural high ground."
Federal Emergency Management Agency: https://www.fema.gov/