For more information on the Arroyo Seco Canyon, see GORP's Arroyo Seco feature.

The ride begins at the corner of Ventura Ave. and Windsor St. in West Altadena. You can park in the paved lot immediately south of this intersection. There are two paved roads leading north into the canyon. The left (west) one descends into the parking lot of Cal Tech's Jet Propulsion Laboratory. You enter the road to the right (east) by riding around a locked yellow gate. Immediately, you will see a JPL ONLY sign. Ignore it; it should be on the other road.

Passing along the site of the old Angeles Crest Highway into Arroyo Seco Canyon, the Arroyo Seco trail utilizes sandy dirt roads to explore this forgotten drainage. Traveling along the gurgling stream, riders cross back and forth over 10 bridges throughout the trek.