Trinity Mountain is the highest point in the Trinity Mountains, a subrange of the Boise Mountains in Boise National Forest, Idaho with a summit elevation of 9,451 feet (2,881 m). It is located 11.63 miles (18.72 km) from Steel Mountain, its line parent, giving it a prominence of 2,371 feet (723 m). Trinity Mountain is within the watershed of the South Fork Boise River.
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