A glacier remnant rapidly melts within a cirque below Sacajawea-Matterhorn Ridge in the Wallowa Mountains, Wallowa–Whitman National Forest, in the Columbia Plateau of northeastern Oregon, USA. The geology of the Matterhorn is a motley mix of limestone (fossilized reef) and volcanic rocks of the Martin Bridge Formation. From Wallowa Lake Trailhead, I hiked 7.7 miles one way with 3200 feet gain to Ice Lake plus 3.7 miles round trip with 2000 feet ascent and descent to Matterhorn Peak. I tented overnight at Ice Lake before returning 7.7 miles to the trailhead.
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