on september 30, 2011, a pair of intertwined giant sequoias collapsed across the northernmost section of the main loop trail. later, during the winter of 2018/19, another giant sequoia fell across the first two from the southwest, destroying part of the newly constructed boardwalk. both events were determined to have been caused by heavy soil saturation during the unseasonably we winters of 2010/2011 and 2018/19.