Barrett Lake Trail lies in the Sierra Nevada near the famous Rubicon Trail. The Barrett Lake Trailhead is located at Dark Lake just North of Wrights Lake and 8 miles north of Highway 50. The Barrett Lake Jeep Trail is rated by some to be tougher than the Rubicon because there are no bypasses or alternate routes around tougher sections of trail. The trail is a dead-end, so you leave the way you came in and it is about 6 miles long.