The Montana Department of Transportation plans to replace two bridges over Trail Creek and one culvert at Canyon Creek on Highway 43 west of Wisdom. The Trail Creek bridges were built in 1961and have neared the end of their lifetime. Although they are still safe for travel, rehabilitation and maintenance is no longer practical due to deterioration. The culvert at Canyon Creek is too small, causing heavy spring runoff to overflow onto the highway.
The new bridge structures and culvert will serve the community well into the future. Design plans include:
- Upgraded railing and slightly wider design than the old bridges.
- No pier in the stream allows more water to flow through and restores Trail Creek to a more natural flow.
- Larger design allows more water to flow through and prevents overflowing onto the roadway.
Accelerated Bridge Construction (ABC)
MDT will use Accelerated Bridge Construction (ABC) methods for replacing the Trail Creek Bridges. ABC is a fast-tracked construction technique that uses pre-fabricated bridge components to replace the old bridges.
Compared to typical bridge construction, the ABC method:
- Will reduce the construction time of the bridges by 2-3 months.
- Requires fewer traffic delays.
- Has a smaller environmental impact.
- Is comparable in cost.
- Will require a short period of complete closure (typically 2-3 days) to install each bridge.
Watch a video example of the ABC method.
The project is located 17 miles west of Wisdom on Highway 43 near the May Creek Campground. The construction work zone is approximately 1.3 miles long.