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Yosemite NP records 85 rockslides in 2017—a record

There were many large and consequential rockfalls in Yosemite National Park in 2017, with a record 85 events (including rockfalls, rockslides, and debris flows) documented.

The cumulative volume of these events was about 36,800 cubic meters. Although this is not the largest annual volume recorded, greater volumes in previous years were typically dominated by one very large event (for example, the 46,700 cubic meter rockfall from Ahwiyah Point in 2009), whereas the cumulative volume for 2017 resulted from several large and medium-sized rockfalls.


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