Heavy mid-September rains in northern Colorado caused landslides along with flooding. This slide occured on the northwest flank of Twin Sisters Peak near Rocky Mt. National Park near Aspen Lodge.
Saint Malo Retreat Center
Trees turned to matchsticks by a landslide near the Saint Malo Retreat Center in Allenspark, Colo.
Colorado Debris Flow
Hundreds of landslides and debris flows like this one at the Saint Malo Retreat Center in Allenspark, Colo., occured during the floods of September 2013.
The Saint Malo Retreat Center in Allenspark, Colo., barely missed being hit by a landslide caused by heavy rains.
Debris in Jamestown, Colo., after flooding created landslides in the mountain town.
Boulder Canyon Damage
Debris flow damage in Boulder Canyon in the wake of September's Colorado floods.
Stephanie Pappas, Live Science Contributor
Stephanie interned as a science writer at Stanford University Medical School, and also interned at ScienceNow magazine and the Santa Cruz Sentinel. She has a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science writing from the University of California, Santa Cruz.