A thawing rock glacier underneath a 100-yard section of the road going through Polychrome Pass is causing the road to slump.
"Dave Schirokauer"
Denali Park glacier surging for the first time since 1957
The Muldrow Glacier is moving about 20 meters per day right now, over 100 times faster than its non-surge speed of 16 centimeters a day. The last time it surged was in 1956-57.