Today I was driving from Northern California to the Mojave Desert and decided to take a peek at the San Luis Reservoir water level. You can see my picture below. We are nearing the end of our annual dry season and the level is 20% of capacity according to the state statistics. I would have guessed that it was less than 10% from viewing the lake. This lake controls the flow of irrigation water to much of the central valley and the water is used for agriculture. San Luis reservoir mostly gets its water pumped in from elsewhere by the California Aqueduct.