Sunday marked the 20-year anniversary of the Happy Isles rockfall, one of the most devastating rockfalls in Yosemite’s history. At 6:52 pm on July 10, 1996, two rockfalls detached in quick succession from the rim of Yosemite Valley east of Glacier Point. Approximately 90,000-180,000 tons of rock slid down a bedrock ramp and went airborne, … Continue reading Happy Isles Rockfall = One of the Most Devastating Rockfalls in Yosemite’s History. [Video]