The threat of imminent collapse of the Oroville Dam emergency spillway continued to ease Monday morning, hours after authorities ordered the evacuation of more than 180,000 downstream residents upon discovering damage to the structure.
But there is still serious concern about the condition of the auxiliary spillway, and it’s unclear when residents will be able to return to their homes.
Crews worked through the night to shore up the emergency spillway at troubled Oroville Dam, racing to fortify the structure before a series of storms arrive Wednesday night.
Three storm systems will hit Northern California during the next six days, according to the National Weather Service. The first system will drop about an inch of rain in Oroville between 10 p.m. Wednesday and 4 p.m. Thursday. Greater amounts of precipitation will fall in the mountains northeast of Lake Oroville.
Forecasters are confident that the first two storm systems will not cause huge inflows into Lake Oroville. They are less confident about the third system, which is due around Tuesday. That storm could be bigger and warmer, meaning more rain and snowmelt streaming into Lake Oroville.