The rain has started to return in Northern California and will continue over the next few days, but officials aren't as concerned about the upcoming weather so much as the damage already done to the Oroville Dam's already compromised main spillway.

The risk of flooding has dropped substantially, but Butte County Sheriff Kory Honea warned residents Wednesday that they remain in "an emergency situation."

How do you fix crippled Oroville spillway? Tons of rocks and sandbags

With new storms approach, work will continue Tuesday at Oroville Dam to shore up a damaged emergency spillway that prompted the evacuation of more than 100,000 residents.

What are workers doing?

Drops: Helicopters are dropping sacks of rocks into a hole created by erosion. Dump trucks are also bringing in more rocks to patch other spots and create slurry.

Road: They're also building a gravel road out to where the helicopters are dropping the rocks. Then the trucks can drive out and create a slurry to deposit.

"You're putting rocks in a hole. Then you're putting slurry in to solidify it," said Chris Orrock, spokesman for the Department of Water Resources. "When water comes down, it will hit that patch and roll off."

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