Virtual Tour of US 99Santa Clarita Valley Pico Canyon Road / Lyons Avenue This section of US 99 was opened with three lanes in 1930. It was under construction through this area as early as 1928. In April 1949, US 99 was widened to a four-lane expressway from Pico Canyon Road to Saugus Junction. In … Continue reading US 99 – Pico Canyon Road