This pristine California landmark is back to capacity !! And there is no more beautiful environment, than this peaceful, yet breath-taking sanctuary. Shasta Lake is a reservoir in Shasta County, within the Whiskeytown–Shasta–Trinity National Recreation Area. The rains came this winter, fueled by the El Niño pattern, and have replenished the lake. It's been such a beneficial rainy season that Shasta Lake is now at 109 percent of historical capacity for this time of year, according to Climate Central. This is the first time in three years that the lake has reached these levels.