A bridge on U.S. 20-26 at Exit 26 in Caldwell, Idaho, will be fully replaced after a crash on August 4 left the structure too damaged to remain in service, the Idaho Transportation Department has announced. The bridge will stay closed to traffic until a new span is constructed, with no reopening date yet confirmed.
What Happened at Exit 26
The August 4 crash caused damage severe enough that state transportation officials determined repairs alone would not be sufficient to return the bridge to safe use. Rather than attempt a patch or partial fix, the Idaho Transportation Department determined a full replacement was the necessary course of action. The closure has remained in effect since the crash and will continue for the duration of the replacement project.
For Canyon County drivers who regularly use U.S. 20-26 through the Caldwell corridor, the bridge closure at Exit 26 adds another infrastructure challenge to a stretch of highway that sees heavy commuter and commercial traffic. The Treasure Valley’s continued growth has placed increasing pressure on roadways throughout the region, making bridge outages particularly disruptive to the daily routines of Canyon County families and businesses.
Temporary Traffic Signals Planned at Exit 25
To help manage the traffic impact from the closure, the Idaho Transportation Department is working to install temporary traffic signals at Exit 25, the interchange immediately west of the damaged bridge. Those signals are intended to provide drivers with a workable alternate route through the area while the replacement project moves forward.
The rerouting of traffic to Exit 25 will likely increase congestion at that interchange, particularly during morning and evening commute hours. Drivers traveling between Nampa and Caldwell, or accessing U.S. 20-26 from the Caldwell area, should plan for additional delays and allow extra travel time until the new bridge is complete.
Canyon County residents traveling in the area may also want to stay informed about other nearby infrastructure work. A pavement project on the I-84 Garrity Interchange ramp in Nampa has also prompted a temporary closure on that end of the county’s highway network, compounding travel disruptions for local commuters.
Impact on Canyon County Commuters and Commerce
Bridge replacements, while necessary for long-term safety and reliability, are among the more disruptive infrastructure projects a community can face. Unlike a simple lane closure or short-term maintenance window, a full bridge replacement typically requires an extended period of closure — often months — before a new structure is ready for traffic.
For the businesses and residents in and around Caldwell who depend on easy access to U.S. 20-26, the closure at Exit 26 represents a meaningful inconvenience. Truck drivers hauling agricultural products, commuters heading to jobs across the Treasure Valley, and families running daily errands will all feel the effects until the project wraps up.
The Idaho Transportation Department has not yet publicly announced a project timeline or estimated completion date for the replacement bridge. Cost figures for the project also had not been released as of this report.
What Comes Next
The Idaho Transportation Department is expected to move forward with design and procurement steps for the replacement bridge. In the meantime, the temporary traffic signals at Exit 25 will serve as the primary accommodation for displaced traffic in the corridor.
Drivers are encouraged to monitor ITD’s travel information resources for updates on the project timeline and any changes to the detour route. Canyon County commuters should also keep an eye on broader infrastructure conditions across the region — Idaho News is tracking transportation and infrastructure developments statewide.
Anyone with questions about the Exit 26 bridge replacement project can contact the Idaho Transportation Department directly through its official channels for the latest information on construction schedules and traffic impacts.