Permafrost thaw and Denali’s park road
Thawing ice-rich ground destabilised a section of Denali’s road. NPS’s 2025 account explains the decision to bridge the active landslide rather than continually repair the slipping road.
The bridge was completed in September 2026, but public bus access to the west end was expected for the 2027 visitor season. Completion and service reopening are separate claims.
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Evidence and its scope
| Claim | Period and scope | Source |
|---|---|---|
| NPS links acceleration of the Pretty Rocks landslide to permafrost thaw and records the August 2021 road closure. | 2021 closure; January 2025 assessment | Open source |
| NPS announced bridge completion while public bus service to the west end was expected to resume in 2027. | 3 September 2026 | Open source |
Possible requirement roles
- An ecosystem and its managementIdentify the ecosystem’s scale and processes.; Explain interactions and human pressures.; Do not attribute every change to a single cause.
- Place and changing meaningsDefine the neighbourhood or place.; Combine numerical indicators with lived experience.; Compare whose perceptions and outcomes the evidence represents.
Recall the evidence
Case-recall questions load here. The sourced evidence remains available below.
Practise using the evidence
Apply a related skill
Contours and relief · Gradient · Source evaluation
Related lessons
Climate change: evidence, causes and responses · Cold environments: permafrost, ecosystems and access · Carbon cycles: stocks, fluxes and changing feedbacks
Build a better answer
Use a fresh resource to practise selecting evidence and explaining its significance.