Billings Crews Begin Roundabout at Monad and 36th

Construction is underway to replace the intersection with a single-lane roundabout following a fatal crash in June.

Updated on Oct. 22, 2026 in Construction

A yellow industrial excavator digs at a suburban road intersection undergoing construction, with piles of gravel and new asphalt visible. — Billings city crews began work on a new roundabout at the intersection of Monad Road and South 36th Street, a safety project following a fatal crash. AI Illustration. Upload story photo >

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City workers started construction on a new single-lane roundabout at the intersection of Monad Road and South 36th Street West on October 19. The project aims to improve driver safety by forcing traffic to slow down in an area that saw a fatal crash earlier this year.

Why it matters

The intersection project is a strategic safety measure designed to decrease the frequency of high-impact collisions. Officials aim to replicate safety gains seen in other areas where traffic flow has been modified to prevent serious accidents.

The project is expected to last 35 days, with local authorities already maintaining 20 roundabouts across the Billings area. Nationwide data indicates that roundabouts reduce serious injury crashes by 76 percent in addition to the decrease in fatalities.

The details

Crews are currently working to convert the existing four-way intersection into a single-lane roundabout design that mandates lower vehicle speeds. Despite the closure, officials have reported that some drivers are continuing to ignore posted road closure signs at the site.

June 2026: A fatal crash occurred at the intersection.
October 19, 2026: Construction work began on the roundabout.
October 22, 2026: The second day of active construction took place.
November 2026: The construction project is estimated to reach completion.

Market Landscape

This construction initiative follows the precedent set by the fatal crash at the intersection in June 2026. The city is using established safety data to address the dangerous conditions that led to the earlier loss of life.

Drivers must adhere to the current road closures at Monad Road and South 36th Street West to ensure the safety of construction crews. Residents should expect temporary detours and traffic delays through November while the roundabout is installed.

The takeaway

Adhering to detour signage is critical to finishing the project on schedule during the 35-day window. Proper navigation of the site helps protect workers and prevents accidents while the transition to a safer intersection design is finalized.