STUDIO CITY (CBS) — Clean up the LA River this weekend!

Shelly Backlar, Director of Friends of the LA River, visited the KCAL9 studios Thursday to talk about tThe 23rd Annual La Gran Limpieza: The Great Los Angeles River CleanUp on Saturday from 9AM to Noon at 15 locations.

More than 4,000 volunteers are expected to pull 25 tons of trash from the Los Angeles River.

The LA River is over 50 miles long, the headwaters starting in Canoga Park running through Los Angeles to Long Beach, with multiple tributaries. It was a natural, seasonal river before it was channelized by the US Army Corps of engineers over decades in the 1930’s – 1960’s.

For more information, visit Friends of the LA River online.