Walupt Creek Loop Trail Professional Review and Guide
"More a triangle than a loop, this route offers breathtaking views from the summit of Nannie Peak—just as you might expect from the site of a former fire lookout tower. There’s more than views to this hike, though. You’ll find wonderful wildflower meadows along the crest of Nannie Ridge a clear, cold swimming experience in Sheep Lake, a walk along the spine of the Cascades on the Pacific Crest Trail, and a cool forest hike in the Walupt Creek valley.
The trail is short and gentle enough to enjoy as a long day hike, but the fine (though few) campsites at Sheep Lake, with their astounding views of Mount Adams (especially at sunset, when the alpenglow has the snowy peak of Adams aflame with orange light), can be too tempting to pass up, as many backpackers can attest."