I-84, Blacks Creek Interchange
The bridge has reached the end of its lifespan and is in need of replacement
The existing bridge has been patched to last through construction of the new bridges. The replacement bridges will be constructed off of the roadway and then slid into place after it is built.
Ramps will also be upgraded to meet standards for the 80 MPH speed limit.
Innovative Bridge Construction
This project will be executed using an Accelerated Bridge Construction method known as Slide-In Bridge Construction. The new bridges will be constructed off to the side of the interstate. Once complete, traffic will be shifted to one side of the interstate, the old bridge demolished, and the new bridge slid into place. The same method will be repeated for the other bridge.
Watch the process for a bridge in McCall
In comparison to traditional bridge construction methods, Slide-In Bridge Construction significantly reduces the amount of time each bridge needs to be closed, providing greater safety, mobility, and economic opportunity for Idaho.
This step of the project is anticipated to start in summer 2020.
- Through the winter, two lanes in each direction will remain open on I-84
- Traffic will be crossed over into a two-lane, two-way configuration in the late Spring 2020 to accommodate demo of old bridge and slide of new bridge
Blacks Creek Road
For current project impacts, visit Idaho 511
- The road will be closed underneath the bridge structures intermittently
- Access to ramps on and off I-84 will remain open, with rare exceptions