It was built around the Pacific Electric Sierra Madre interurban railway line.
[1] The smaller and older portion of the road was originally Central Avenue in Sierra Madre, built some time in the 1860s or 1870s.
The road forms a "┌" shape, starting at Elevado Avenue in Arcadia heading west and ends at Huntington Drive in San Marino.
Floats are display the day after the Roses Parade on Sierra Madre Boulevard.
Much of the boulevard in Pasadena has large grass median strip area between the lanes, that was part of the Pacific Electric street car in the past.