Interstate 705 (abbreviated I-705, also known as the Tacoma Spur) is a short Interstate Highway spur route of Interstate 5 located entirely within Tacoma, Pierce, Washington, United States. I-705 serves as the connector between Interstate 5, Downtown Tacoma, Tacoma's waterfront, North Tacoma, and the Tacoma Dome. I-705 was the last portion of the Interstate Highway System to be constructed in Washington.