The Third Biennial Report of the Oregon State Highway Commission is an official government publication detailing the activities, progress, and financial status of the Oregon State Highway Commission for the biennial period ending December 31, 1918. This comprehensive report provides an in-depth overview of the Commission's efforts to develop, improve, and maintain Oregon's highway infrastructure during a pivotal era of growth and modernization. It includes detailed accounts of road construction projects, maintenance activities, and the allocation of state and federal funds. The report features extensive statistical data, maps, and photographs illustrating the condition and expansion of Oregon's roadways, as well as challenges faced due to weather, terrain, and the impact of World War I on labor and materials. It also discusses legislative developments, policy recommendations, and the evolving relationship between state and county governments in the administration of highway projects. Through its thorough documentation and analysis, the report offers valuable insights into early 20th-century transportation planning and the foundational work that shaped Oregon's modern highway system.