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Arroyo Seco at sunset

Preserving our watersheds and native species through advocacy, community involvement, and restoration.

ASF Home: Welcome
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Who We Are

The Arroyo Seco Foundation was founded a century ago with the mission of protecting the Arroyo Seco, a canyon and stream running south from the San Gabriel Mountains which converges with the Los Angeles River near Elysian Park.  The organization was reconstituted in 1989 to advocate for the preservation of the watershed, including protection and restoration of the native flora and fauna.

We have worked in the Arroyo Seco to restore habitat, monitor the local population of rainbow trout, advocate for changes to enable steelhead trout to return, and operate a native plant nursery in Hahamongna Watershed Park.

ASF Home: About

What We Do

Hahamongna Native Plant Nursery

Hahamongna Native Plant Nursery

Watershed Projects

Project information coming soon!

Trout Scouts

Trout Scouting information coming soon!


Event information coming soon!
ASF Home: Projects

Get involved!

  • Volunteer at the nursery

  • Become a Trout Scout

  • Save water and support native wildlife by landscaping with native plants

  • Donate to support the mission

P.O. Box 91622

Pasadena, CA 91109

(626) 630-1931

Thanks for submitting!

ASF Home: Contact Us

Donate now to support ASF's mission!

The Arroyo Seco Foundation is a nonprofit,

tax-exempt charitable organization under

Section 501(c)(3) of the Internal Revenue Code.

(tax ID number 95-4328068)
Donations are tax-deductible as allowed by law.


Thanks for donating!

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ASF Home: Donate

Show your love for two great local institutions at the same time!

Join Vroman's Bookstore Gives Back program (it's free!) and choose ASF as your recipient organization. 

Every time you make a purchase, a portion of the proceeds will be donated to the Arroyo Seco Foundation!

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