Access Emerald Lake via the Stuart Fork Trail, a 27. 2-mile round-trip hike (13 miles one-way) through the Trinity Alps Wilderness with 4,552 feet of elevation gain. Free wilderness permits are required and can be obtained at the Weaverville Ranger Station.

The trail follows Stuart Fork and reaches Emerald Lake at approximately 5,500 feet elevation, where visitors will find old mining equipment and opportunities for fishing and paddling; continue another 600 feet of elevation gain to reach the scenic Sapphire Lake.