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Lower Arroyo Seco

Windsor Ave.
Altadena, CA 91001
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The Altadena hiking trail known as Lower Arroyo Seco begins with a flat, lightly winding path turning into an increasingly graded romp through pleasantly forested terrain, featuring deciduous trees that lend a surprisingly northern feel. You'll cross a rushing brook that turns into a small river in snow-melt season. The beginning of the hike passes the canyon inhabited by the aeronautics installation JPL, or Jet Propulsion Laboratories.


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