During the drought that ended in 2016, the level of Lake Shasta was even lower than this. With the replenishing rains that followed and refilled the reservoir, the water level came up to where this sign is located. It's hard for me to imagine that volume of water being replaced in one year. In order to catch the boat across the lake to visit Lake Shasta Caverns, visitors take a series of steps from the ticket office/gift shop located up the hill from here, and then proceed down a traill to the boat..