SAFE Bridges Act of 2017 Strengthen And Fortify Existing Bridges Act of 2017 This bill directs the Department of Transportation to establish a program to assist states to rehabilitate or replace bridges found to be structurally deficient. States shall use apportioned program funds for projects to rehabilitate and replace such bridges. The federal share of project costs is 100%. Prevailing rate of wage requirements for construction of federal-aid highways projects shall apply to such projects.