A large, slow-moving landslide on the west side of Portage Glacier poses a potential risk to employees at the Begich, Boggs Visitor Center, recreationists, and nearby facilities if it were to fail catastrophically. A large, sudden landslide could flow into Portage Lake and cause a significant tsunami, potentially threatening people from Whittier to Turnagain Arm.
Landslides are a widespread hazard throughout the state of Alaska. Together, with federal, state, and private partners, the Chugach National Forest is monitoring conditions of the Portage Valley landslide to support informed decision-making. The Forest evaluates environmental conditions, including precipitation forecasts and other indicators, to determine if a temporary closure of the Begich, Boggs Visitor Center is necessary. If conditions meet established thresholds, the Forest will take all appropriate actions to protect the safety of our employees and the public.
Forest users and recreationists should be aware that large, potentially catastrophic waves can occur without warning. Extra caution is advised during and immediately after periods of heavy rainfall, especially in summer and fall.
Current monitoring systems cannot issue real-time alerts to ensure safety. If an earthquake occurs, immediately seek higher ground on the shore. Consider adjusting travel or recreation plans during exceptionally wet conditions and always carry reliable emergency communication devices.
Chugach NF Geological Hazards
Camp Observer
