I was looking at some CA reservoir capacity charts. There seems to be a repeating pattern. There will be several years of full capacity after successful seasonal inflows, then OK capacity, and then low capacity. Then the cycle starts over again. I can see Lake Oroville filing up from near historic lows last year. It did it in 2019.
On average, there is barely enough water.
I remember driving across a bridge over a river on the way from San Francisco to Yosemite in 1977. There was a sign on the bridge “No Diving”. You could barely even see the river some hundreds of feet below, much less even hit it from diving off the bridge.
It was, of course, an empty reservoir. Things haven’t changed much in the last 46 years.