The expressway section of SR 500 was constructed in the 1970s and 1980s to relieve the congested Fourth Plain Boulevard, but full interchanges were deferred due to budget issues. A section between Andresen Road and 112th Avenue, including the interchange with I-205, opened in December 1976. A  section from St. Johns Road to Andresen Road was opened in November 1983 and was followed by an extension west to I-5 in 1984.
The expressway section of SR 500, constructed in the 1970s and 1980s to alleviate congestion on Fourth Plain Boulevard, had its full interchanges delayed due to budget issues. A segment between Andresen Road and 112th Avenue, including the I-205 interchange, opened in December 1976. Another section from St. Johns Road to Andresen Road was launched in November 1983, followed by an extension westward to I-5 in 1984.