Thanks to a stormy winter and spring, Lake Shasta’s water level is almost a third higher than it usually is in mid-October. The state’s largest reservoir at Shasta Dam, nine miles north of Redding, was 71% full on Monday, according to the California Department of Water Resources. That’s 130% of what the lake usually holds on that date, according to the state. … Last summer, Shasta Lake was also able to cover water demands it usually shares with Trinity Lake. That allowed Trinity Lake reservoir to keep water it stored in spring, and additional water it gained from mountain snow melt in summer.