Shasta Lake, the largest reservoir in California, hit full capacity in the spring of 2025. 

After weeks of relentless winter storms, all of California’s key reservoirs are swelling past their historical levels for this time of year.

California’s largest reservoir, Shasta Lake, is at 123% of its historical average for this time of year, measuring at 72% capacity as of Monday, according to the California Department of Water Resources. 

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The reservoir’s current surface elevation is 1,019 feet, which is not far from its full capacity, according to Monday data from the Bureau of Reclamation, the agency that oversees the reservoir. When Shasta is full, the elevation is 1,067 feet above sea level. 

Lake Oroville, the state’s second largest reservoir, is also trending higher than its seasonal norm. The reservoir is........

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