History
SR 512 originated as a road connecting Parkland, Midland and Summit with Puyallup that existed before 1900. By 1912, a road connecting what is now Lakewood to the Parkland–Puyallup road. These two roads became Secondary State Highway 5G (SSH 5G), which ran from Primary State Highway 5 (PSH 5) in Puyallup south to SSH 5N and west past the Tacoma–Mount Rainier branch of PSH 5 to PSH 1 south of Tacoma. Washington renumbered its highways in 1964 and SSH 5G was assigned to become SR 512 when the new system took effect in 1970. In 1970, the new system of state routes took effect and SR 512 was officially established. By 1972, the highway was expanded and reconstructed to become a divided freeway.
In 2002, the interchange with Interstate 5 was modified from a full cloverleaf to a partial cloverleaf. The Southbound I-5 ramp to SR 512 eastbound was removed. The Southbound to Westbound ramp was modified to accommodate for left turns. In the future, WSDOT plans to again reconstruct this interchange for a full freeway to freeway junction as part of the Interstate 5 HOV project.
Read more about this topic: Washington State Route 512
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