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April 12, 1929, as a National Monument
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"President Franklin D. Roosevelt signs Presidential Proclamation No. 2312 enlarging Arches National Monument." - https://www.nps.gov/articles/arch-timeline.htm
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Rock fall happened at an arch
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"President Dwight D. Eisenhower signs Presidential Proclamation No. 3360 adjusting the boundaries of Arches National Monument." - https://www.nps.gov/articles/arch-timeline.htm
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"President Richard M. Nixon signs Public Law 92-155 changing Arches from a National Monument to a National Park." - https://www.nps.gov/articles/arch-timeline.htm
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another rock fall
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Winter Olympic torch carried through Arches.
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