Agnes Vaille Falls is a waterfall on the southern slopes of Mount Princeton in central Colorado, above Chalk Creek in San Isabel National Forest near Chalk Lake. Long known as a short, popular hike of about half a mile from County Road 162, it is also linked to a deadly rockslide on September 30, 2013, in which five hikers were killed and another was injured. The slide was thought to have been triggered in part by the 2013 Colorado floods. Afterward, the U.S. Forest Service closed the trail, and officials later warned of a reroute because of continuing rockslide danger.