A guerrilla gardener installed a pop-up wetland in the LA River. Here's how — and why

toggle caption Courtney Theophin/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.

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"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 any 3D geometry at all in that river channel will trap sediment, will begin a micro-bloom of ecosystem."

toggle caption Courtney Theophin/NPR

The 36-year-old artist saw an amusing paradox — life sprouting from the metal cart — that planted the seed for his next project: a pop-up wetland in the middle of the LA River.

In a desolate part of downtown, he pushed large rocks from the riverbanks into the water and arranged them in loose, concentric circles. The structure would trap sediment, allowing life to take root.

In other words, Rosenberg produced a patch of watery land — like a marsh or swamp — to support plants and animals.

Over the course of 10 weeks, the simple assemblage of rocks spawned a totally new 10-by-20-foot green island in the middle of the 100-foot-wide channel.

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Rosenberg calls it performance art: a visual statement that carries a call to action. The wetland installation isn't quite what he'd call "impactful ecology," but rather a work of art to show environmental good can be low-tech and small-scale