Union Peak is a heavily eroded shield volcano in the Cascade Range of central Oregon, located along the Cascade Crest less than 7 miles (11.3 km) southwest of the rim of Crater Lake. Ice age glaciers eroded away most of the flanks of the volcano, leaving numerous deep cirques surrounding a central glacial horn. This is the same process that formed the summit horns of Three Fingered Jack, Mount Washington, Howlock Mountain, and Mount Thielsen from other shield volcanoes farther north in the Oregon Cascades.

Union Peak
Union Peak with Mount McLoughlin in the background as seen from Crater Lake.
Highest point
Elevation	7,714 ft (2,351 m)[1]
Prominence	1,509 ft (460 m)[2]
Coordinates	42°49′52″N 122°13′24″W[1]
Geography
Location	Crater Lake National Park Klamath County, Oregon, U.S.
Parent range	Cascade Range
Topo map	USGS Union Peak
Geology
Mountain type	Shield volcano[3]
Volcanic arc	Cascade Volcanic Arc

Union Peak is located within Crater Lake National Park,[3] and the summit was used as a post for fire lookouts from the 1930s to the 1950s. A 5.5-mile (8.9 km) trail leads to the summit from the Pacific Crest Trail off Oregon Route 62.

References