At 3:27 a.m. PDT on August 6, 2010, the southern peak of Mount Meager collapsed in a series of major rockfalls. The rockfalls fell approximately onto Meager's weak and heavily saturated south flank where they destabilized a significant volume of material, forming a highly mobile, very rapid debris flow. The debris flow travelled the entire length of Capricorn Creek then inundated both the Meager Creek and Lillooet River valleys. Meager Creek was dammed for about 19 hours during which time water had built up behind the dam to create a long lake. The landslide dam ultimately failed into the Lillooet River valley, releasing roughly of water towards Pemberton with an average velocity of approximately . No deaths or injuries were associated with the event.