Sapphire Lake is a lake located in the Trinity Alps Wilderness area, in Northern California. The lake sits in a granite bowl, where it is fed by rainwater that runs down the surrounding mountains. Sapphire Lake sits just southwest of, and approximately 300 feet above Emerald Lake. The surface of the lake is 5882 feet above sea level.Visitors can access the lake by hiking the Stuart Fork Trail and continuing past Emerald Lake.