OROVILLE, Calif. (KGO) -- Nearly 200,000 people are still under mandatory evacuation orders Monday night over fear the Oroville Dam emergency spillway could fail.
RELATED: Water level drops at Oroville Dam, evacuations continue
Emergency officials say they are worried that erosion will move into a concrete wall under the spillway, sending a wall of water into the valley threatening homes and businesses.
The spillway eroded over the weekend and with more rain on the way they're in a race against time.
Click here for more stories, photos and videos on the Oroville Dam.
VIDEO: Oroville Dam emergency spillway at risk of failing
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