The third section of Foothill Boulevard is accessed by going south on Mountain and going east on Huntington Drive through the Los Angeles County cities of Monrovia and Duarte. Upon crossing the San Gabriel River into Irwindale, Huntington turns into Foothill Boulevard.
The third section of Foothill Boulevard is accessed by traveling south on Mountain Avenue and east on Huntington Drive, passing through the cities of Monrovia and Duarte. Upon crossing the San Gabriel River into Irwindale, Huntington becomes Foothill Boulevard.