A guerrilla gardener installs a pop-up wetland in the LA River : NPR

LOS ANGELES — To many locals, the Los Angeles River — hugged by concrete embankments and heavy vehicle traffic — hardly seems like a river at all.

The waterway bisecting the city was converted to a giant storm drain nearly a century ago to contain flood waters. Today, it's an extension of the urban network of concrete, running beneath freeways and bridges as it collects all kinds of refuse: spent tires, scrap metal, trash thrown from car windows.

But when Doug Rosenberg came upon a shopping cart tipped over in the river's shallow waters back in 2020, he saw the potential to meet nature halfway.

"It had begun to bloom some greenery around it, and there was a great blue heron perched on the cart, hunting in this little spot," Rosenberg recalled. "That was when it clicked for me — that a