Foothill Boulevard (Southern California)
Foothill Boulevard is a major street in Los Angeles and San Bernardino counties, stretching over 60 miles through the foothills of the San Gabriel and San Bernardino Mountains. Much of it is the historic Route 66, which gives many spots a 1950s diner-and-diner-like feel.
The route starts in Newhall Pass in the Sylmar area of Los Angeles, near the southern end of State Route 14. It begins as a two-lane road, runs alongside I-5 truck lanes until Balboa Boulevard, then widens to four lanes. It passes through Lake View Terrace, the Sunland-Tujunga area, the Crescenta Valley, Glendale, and La Cañada Flintridge, ending at Oak Grove Drive on the La Cañada Flintridge–Pasadena line.
In Pasadena, Foothill Boulevard resumes at Walnut Street/Greenwood Avenue, then goes through Lamanda Park, Altadena, and San Gabriel toward Arcadia and Monrovia. It connects with I-210 at several ramps and crosses into Monrovia, ending near Mountain Avenue and Deodar Lane. The stretch between Arcadia and Monrovia aligns with the historic 1926–1940 US 66 route.
The Azusa segment begins at Huntington Drive at the Irwindale line, curves east, crosses Irwindale Avenue, and continues into Azusa. East of Cerritos Avenue, Alosta Avenue forks southeast to follow the Historic US 66 path toward Citrus Avenue at the Azusa–Glendora line. Glendora marks part of Route 66 on Alosta Avenue.
The final leg runs from Amelia Avenue in Glendora to San Dimas, then to La Verne where Foothill Boulevard becomes SR 66 again and continues through Pomona, Claremont, and into Upland. It passes through Rancho Cucamonga and Rialto, then re-enters San Bernardino at Pepper Avenue and ends at Nuñez Park, where it splits into 4th Street and 5th Street/SR 66.
Maintenance is handled by Caltrans and local jurisdictions.
This page was last edited on 3 February 2026, at 00:33 (CET).