Zink’s team removes invasives like palm trees, giant reed and castor bean. Then they replant species that are normally found in the river. These plants act as filters for the water.

“Cleaning the river up basically gets it in a position where it can clean itself up,” Zink said. The result is improved habitat for local wildlife and a pleasant place for people to visit. “It’s a relief, you might say, from living in the city.”

At SDSU Mission Valley, work has now begun on the 34-acre River Park that will be open to all. The design of the park emphasizes the restoration of native plants and flood prevention. And the San Diego River Park Foundation aims to create a continuous trail along the entire 52 miles of the river from the mountains to the sea.

“I think the river is so important for human lives,” said professor of public health Eunha Hoh. “Humans are part of this ecosystem.”

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