The LA River snakes through 52 miles of Southern California.
Along most of its path from Ventura County to Long Beach it's guided by concrete, but it wasn't always this way. Before it was covered in concrete, the riverside was green and home to an abundance of plants and wildlife.
This week, Mayor Eric Garcetti is making the pitch to make it that way again. He's been in Washington, DC to ask the White House for help on giving the L.A. River a makeover. It's a plan that could cost more than $1 billion.
For a look at the history of the river, and what could change for the people and wildlife along its route, we're joined by KPCC's Patt Morrison, author of the book "Rio LA: Tales from the Los Angeles River."
Then, KPCC Washington correspondent Kitty Felde joins the show with more on Garcetti's efforts in DC.