11 Inches of Rain in 24 Hours Sends Water Surging Into Lake Oroville
An intense round of storms delivered staggering rainfall to the Northern Sierra, with up to 11 inches of rain falling in just the past 24 hours—and Lake Oroville is already feeling the impact.
Lake Oroville, California’s second-largest reservoir, is now receiving about 67,000 cubic feet of water per second as runoff pours in from surrounding watersheds. That’s the equivalent of nearly 3,000 Olympic-sized swimming pools every hour, a clear sign of just how saturated the region has become.
The surge comes as much of Northern California deals with widespread flooding from days of heavy rain. Communities from the North Coast to the Sacramento Valley and the Sierra foothills have reported flooded roads, swollen rivers, and emergency responses for stranded residents. In places like Redding, low-lying neighborhoods and major roadways have already seen significant flooding, while mountain regions continue to absorb rain and snowmelt higher up.
While Lake Oroville still has substantial capacity to manage inflows, state and local officials closely monitor rapid increases like this during major storm events. Reservoirs across the state play a key role in flood control, capturing runoff that might otherwise overwhelm downstream rivers.
With additional storms in the forecast, authorities are urging residents near waterways to stay alert, avoid flooded roads, and prepare for conditions that can change quickly as Northern California remains locked in an active and volatile weather pattern.
