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Arroyo Seco Confluence Cleanup - Friends of the Los Angeles River

  • Arroyo Seco Confluence 475 North San Fernando Road Los Angeles, CA, 90031 United States (map)

It’s time to roll up your sleeves and show your love for the LA River – the Great LA River CleanUp’s back for 2017! Registration is open now – join today and be part of the largest urban river cleanup in America.

Last year 9,000 volunteers shattered records at the 2016 CleanUp and hauled off more than 70 tons of trash. This year we’re going to tear up the record books again with another record-breaking CleanUp!

The Arroyo Seco Confluence is mostly concrete where the 5 and 110 Freeways intersect.  There are red-legged stilts on the concrete and swallows nest under the bridge.  Downtown Los Angeles is where it is because of this confluence – ditches or “zanja” were dug from the River to supply water to the Pueblo.

Located under the Pasadena Freeway is the Confluence of the Arroyo Seco and the Los Angeles River. In 1769, the Portola expedition’s Father Juan Crespi described this area as “very well lined with large trees, sycamores, willows, cottonwoods, and very large live oaks.” This concrete-lined site is just downstream from the natural-bottomed Glendale Narrows. You’ll see red-legged stilts in the shallow water and swallows flying overhead – you can find their mud nests under the bridge.

To participate you must register and turn in a completed waiver at the CleanUp.