This dataset is used as a general reference layer of Seismic Lifelines identified by the Washington State Department of Transportation (WSDOT). It is maintained by the WSDOT Office of Emergency Management. Updates to this dataset are on an as needed basis. This dataset is a snapshot of Seismic Lifelines along the roadway system, effective 12/31/2019. Data provided here is used by WSDOT's transportation partners, government entities, schools, private businesses, and the general public.