He made first ascents of many peaks and routes in the Rocky Mountains, particularly in Colorado, including Lizard Head in the San Juan Mountains, Ellingwood Ridge on La Plata Peak in the Sawatch Range, and Crestone Needle in the Sangre de Cristo Range.
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Many mountain features are named for him, on peaks such as Middle Teton, on which Ellingwood made the first ascent, the Ellingwood Ridge of La Plata Peak, and the Ellingwood Arete ascent of Crestone Needle; the fourteener Ellingwood Point, near Blanca Peak in southern Colorado, is named for him as well.
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