Bears and Buses
Bear cubs pad between park buses on July 3, 2012 in Denali National Park and Preserve. A new project seeks to monitor the landscape around the park's only road for environmental change.
A caribou crosses the road at Sable Pass in Denali National Park in front of a park bus. Only park vehicles are permitted on most of the park road.
A landslide covers part of Denali's Park Road 37 miles (60 kilometers) from the entrance to the park. The slide was discovered on Wed., Oct. 23, 2013.
Blocked Denali Road
Road crews have cleared this slide, which blocked part of Denali's Park Road that was already closed for the season.
Investigating Denali's Landslide
Park officials investiagte a landslide discovered on Oct. 23, 3013. By early November, crews had cleared the road.
Major Denali Landslide
An image of the Denali Park Road landslide, which moved tons of soil and rock over the park's only road.
Before the Landslide
An environmental monitoring project undertaken in the summer of 2013 reveals this groundwater seep along the Park Road at the point where the landslide occured. This seep could have been an early clue that the ground at this spot was unstable.
Seeping groundwater in summer 2013 marks the spot where a landslide would occur over the next winter.
Geologist Ron Karpilo has been photographing glaciers and landscapes in Alaska to track the receeding ice over time. Here, he snaps a shot of Muldrow Glacier in Denali National Park.
Polychrome Glaciers in 1916
July 18, 1916, Polycrome Glaciers, Denali National Park and Preserve, Alaska, United States. Image made by U.S. Geological Survey geologist Stephen Reid Capps. Geologist Ron Karpilo takes modern photographs from the same angle as old USGS shots, providing a record of ice loss in Alaska.
Polychrome Glaciers Today
Ron Karpilo's June 2011 photograph of the Polychrome glaciers from the same angle as the 1916 photograph reveal how much the ice has retreated.