The Alaska Department of Transportation and Public Facilities, in cooperation with the Federal Highway Administration (FHWA), is developing a project to improve culverts and drainage infrastructure within the Parks Highway corridor between Milepost 99-163. Throughout the project corridor, various culverts and drainage infrastructure are exhibiting signs of deterioration including pipe corrosion, drainage channel blockage, inlet and outlet scouring, and other deficiencies. Approximately 200 culverts in the project corridor are anticipated to be evaluated and potentially improved with this project; many were installed more than 50 years ago when the Parks Highway was initially constructed. The Department is focusing on improving the culverts in the most critical condition first.
The project is being developed in phases for design and construction. The project team is currently in the process of designing Phases 1 and 2. Remaining Phases will be developed at a later date.
Phase 1: Replace and/or upgrade 10 culverts that are among the most critical condition and pose the most risk to the highway if they fail. The culverts addressed in Phase 1 are shown in red on the adjacent figure. Design is currently underway and is expected to be completed in late fall 2023.
Phase 2: Replace the existing 144-inch culvert at Railroad Creek with a bridge; it is shown in yellow on the adjacent figure. Design is currently underway and is expected to be completed in early 2024.
Future Phases: Upcoming project phases will address roughly 200 culverts in the project corridor. Improvements to the 12 culverts identified in the figure as "Future Phase" will be prioritized as they are currently in poor condition. During summer 2023, the project team will begin ranking roughly 70 additional culverts and collecting environmental and preliminary engineering data at Horseshoe Creek (MP 159.8).