This highway embankment fissured, spread and slumped on underlying alluvium. The road was built on thick deposits of alluvium and tidal estuary mud along Turnagain Arm of Cook Inlet near Portage, Alaska. These weakened deposits spread laterally away from the road center toward the edge of the embankment. This is the east approach to Twentymile River highway bridge at Portage.

Image Credit: U.S. Geological Survey