August 2025

In celebration of California Biodiversity Week September 6-13

Arroyo Seco Biodiversity Day

Sunday, September 7, 3 pm, San Rafael Confluence

credit: SIWI

What is it?  Why does it matter?  How can you make a difference?

Tour two vital hotspots in the Arroyo Seco:

  • San Rafael Confluence

  • San Pascual Park

At the junction of three cities (Pasadena, South Pasadena, and Los Angeles) on the Arroyo Seco stream

Celebrate three key Arroyo species:

  • Southern Steelhead

  • Monarch Butterfly

  • Least Bell's Vireo

Bring a sign or banner about protecting nature and biodiversity!

Speak Up for Nature!
Restore the Arroyo Seco Stream and Watershed

We would like to know what you think: stewards@arroyoseco.org