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Replace Ghiglione Bridge

Project Description

Spanning a large drainage channel at mile 42 of Denali Park Road, the Ghiglione Bridge has been deemed seismically deficient and identified for retrofitting or replacement. After careful analysis, FHWA determined that the cost to retrofit the existing bridge was nearly as much as it was to replace it. Eliminating the bridge and replacing it with a large culvert crossing was identified in the Value Analysis process as the most economically affordable option, but park management decided there is more value in constructing the new bridge upstream in a manner that will be consistent with the cultural landscape.

Project Partners

  • Denali National Park and Preserve (DENA)
  • Federal Highway Administration – Western Federal Lands Highway Division (FHWA-WFLHD)

Scope of Work

  • The proposed project includes the following:
  • Routing the park road upstream and onto the original 1930’s park road alignment for use as a bypass during the project;
  • Constructing a bridge in the drainage channel approximately seventy to one hundred feet upstream of the existing bridge;
  • Excavating the eastern and western approach ridge noses to meet corner radius standards. Material from the existing approaches would also be used as fill as it is reclaimed as the road is realigned to the north and narrowed to meet road design standards and;
  • Dismantling the old bridge and waste at MP 70 pit

Anticipated Timeline

  • March 2013: Project kick off
  • July 2015: Survey and mapping
  • September 2017: Scoping review
  • January 2018: Preliminary Type, Size, and Location (TS&L) review
  • April 2018: Preliminary design review
  • June 2019: National Park Service (NPS) National Environmental Protection document (NEPA)
  • July 2019: FHWA NEPA document
  • May 2019: 70% Plan-in-hand review
  • September 2019: Obtain permit
  • September 2019: 95% Plans, Specification and Estimate (PS&E) Review
  • November 2019: Obtain Park’s approval
  • December 2019: Project sign off
  • December 2019: Shelf Project
  • August 2020: Project Signoff
  • Fall 2022: Award 
  • Summer 2025/2026: Construction 

Project Photos