Highway 99, known as the Pacific Highway in different sections, has a rich history in California, Oregon, and Washington. Established in 1926, it played a vital role in connecting cities in the Central Valley of California before the Interstate system was created. In Oregon, it split into 99E and 99W, passing through key agricultural areas and retaining its charm despite the introduction of Interstate 5. In Washington, it was known as the Pacific Highway, with iconic features like the Alaskan Way Viaduct and Aurora Bridge. While overshadowed by I-5, Highway 99 remains a significant local and regional route, reflecting the cultural and economic development of the American West. Efforts to preserve its legacy highlight its importance in shaping the history and landscape of the region.