Thousand Island Lake is in the Ansel Adams Wilderness outside of Mammoth, California. You need permits to camp overnight, and there are multiple trails to hike in on. You need to submit for a permit on the trail you plan to hike to reach the lake. You can find more information about the permitting process here. During peak Summer months you also need to take a shuttle to the trailhead. Since we went at the end of September we were able to park at the trailhead.

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