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Stephen A. Long Expedition travels the plains and are the first non-Indians to see Longs Peak.
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the rocky mountain national park was created in January 26, 1915
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Rocky Mountain National Park dedicated in Horseshoe Park
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Trail Ridge Road constructed
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Colorado-Big Thompson Project and Alva B Adams tunnel completed under Park
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Establishment and designation of the Continental Divide National Scenic Trail
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Lawn Lake dam collapses - flood kills 3 people and severely impacts Estes Park
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Hidden Valley becomes a ski area; closed in 1992 and removed by 2002
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Grand Ditch breach occurs
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Hidden Valley reopens for winter sledding and summer picnics
