Yosemite National Park will reopen the Mirror Lake Loop hiking trail tomorrow, Thursday, October 18, 2012, at 5:00 p.m. The five mile loop that follows Tenaya Creek around Mirror Lake in Yosemite Valley has been closed since March 28, 2009 due to a large rockfall from Ahwiyah Point near Half Dome. https://www.nps.gov/yose/learn/news/mirrorlakeloopopens.htm