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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.

What We Do

Hahamongna Native Plant Nursery


Trout Scouts

Hahamongna Native Plant Nursery

Click below to download
reports related to our
Streamflow Enhancement Program

Watershed Projects

Arroyo Currents

Click below to download
our quarterly newsletter

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Trout Scouting information coming soon!
Project information coming soon!

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

Thanks for submitting!

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.


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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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