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First Freeway in the Western United States

Arroyo Seco Parkway (Pasadena Freeway 110), 1940. Courtesy of the California Department of Transportation.

The Pasadena Freeway (110), or “Arroyo Seco Parkway” as it was originally called, is on the U.S. National Register of Historic Places as the first freeway in the Western United States. It was opened to traffic in 1940. It is designated as a State Scenic Highway, National Civil Engineering Landmark, National Scenic Byway and is listed in the National Register of Historic Places.


Construction on the Arroyo Seco Parkway, 1938. Courtesy of the California Department of Transportation.