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Castle Mountain is a 6,680-foot (2,036 m) mountain summit located in Pierce County of Washington state. It is set on the boundary of Norse Peak Wilderness, on land managed by Mount Baker-Snoqualmie National Forest. It is situated three miles (4.8 km) north of Crystal Mountain ski area, and one mile west of the crest of the Cascade Range. Precipitation runoff from Castle Mountain drains into tributaries of the White River. The Pacific Crest Trail traverses the east slope of Castle's Southeast Peak.