This two-lane highway winds through the San Gabriel Mountains northeast of Los Angeles for 66 miles.
The western end of the Angeles Crest Highway begins in La Cañada Flintridge, and ends at the junction of SR138. The western end is known as the Angeles Crest Scenic Byway. At a peak of 7,903 feet this is also one of the highest highways in California.
Originally constructed as a fire road in 1929, the paved highway was completed in 1956 and used prison labor for much of the construction.