Idaho Falls starts Birch St & South Blvd roundabout—full closure ~30 days
Construction begins Sunday, July 12, 2026 on a new roundabout at Birch Street and South Boulevard. Plan for about 30 days of full closure.
The City of Idaho Falls says construction begins Sunday, July 12, 2026 on a new roundabout at the Birch Street and South Boulevard intersection—and during the main work period, the city expects the intersection to be fully closed to all traffic for about 30 days.
City officials also say the overall project is expected to take about 120 days, with completion targeted for late fall. The city adds that the schedule may change due to weather or unforeseen conditions, so residents should plan ahead and keep checking for updates.
Where the closure will be (and when it starts)
According to the city’s announcement, crews will close the Birch Street and South Boulevard intersection to all traffic beginning July 12, 2026 while work is underway. The city expects the full closure to last approximately 30 days.
What drivers and neighbors should expect the project to change
The city’s news release says the roundabout is designed to improve safety and traffic flow. It also notes several specific updates, including:
- Realigning the intersection so Birch Street meets South Boulevard at a right angle instead of a skew.
- Building a roundabout to reduce conflict points and improve visibility.
- Removing some on-street parking near the intersection to improve sight lines.
- Upgrading pedestrian and bicycle crossings to improve visibility and shorten crossing distances.
Detours will be posted—follow signs and allow extra time
The city says clearly marked detour routes will be in place during the closure. Motorists are encouraged to plan ahead, allow extra travel time, and follow all posted detour signs rather than relying on normal turning patterns through the work zone.
For ongoing updates and a clear picture of the planned layout, the city points residents to its Construction hub (which links to its interactive construction maps) and to the B irch Street / South Boulevard roundabout design map in its Document Center.
Project basics
The City of Idaho Falls identifies the contractor as DL Beck Inc.
Timeline warning
Even beyond the initial ~30-day full closure window, construction is expected to continue for about 120 days overall. Because the city says the schedule may change due to weather or unforeseen conditions, the practical takeaway is to watch for posted construction alerts and detour signage throughout the project.
Sources
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