Road work on US 12 between Helena and East Helena runs through mid-August

Crews were rebuilding US Highway 12 between Helena and East Helena in a nearly $3.8 million pavement preservation project that runs from about mile marker 46 to mile marker 50. The work is scheduled to continue into mid-August, keeping a busy commuter and freight route under traffic control all summer.

The Montana Department of Transportation said the project includes milling the roadway surface, applying high-friction surface treatment in parts of the corridor, crack sealing, repairing bridge and deck elements, updating guardrail, and adding new pavement markings. That mix goes beyond a fresh top layer of asphalt. It is aimed at extending the life of the highway while improving traction and safety on a stretch that carries more than 17,000 vehicles a day on parts of the corridor.

For drivers, the practical effect is slower travel between the two communities and more stop-and-go movement through the work zone. MDT said motorists may see reduced speeds, single-lane traffic control, and brief turn-lane or side-street closures. That will affect daily commutes, school travel, delivery trucks, and East Helena businesses that depend on steady access from Helena and the surrounding county.

The project also fits into a larger transportation picture on US 12 in the Helena area. MDT has already been studying safety and traffic changes farther east in southeast Helena through the Lola Shephard Intersection Improvement Project, where the agency tied the need for changes to a high frequency of crashes from vehicles turning left from Lola Street onto westbound US 12. Public and stakeholder input was held in March 2019 and September 2020, and MDT said after fall 2024 outreach that the current design was not moving forward, with construction tentatively set for 2027 if design and funding are completed.

MDT’s broader safety messaging underscores why the highway work matters now. The agency says Montana summers bring more traffic as visitors head to national parks, lakes, small towns, and scenic highways, and it puts its workforce at more than 2,000 people statewide. MDT also said that as of June 15, 2026, 65 people had died on Montana roads this year, down from 86 at the same point in 2025. In that context, the US 12 work between Helena and East Helena is less a patch job than a season-long effort to keep one of Lewis and Clark County’s main connectors open, safer, and usable under heavier summer traffic.