Montana Department of Transportation


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Public Involvement

East Helena Viaduct – Phase 2

Project Overview

The East Helena Viaduct Project was commenced in April 2018 to improve the safety of a 2.2 mile stretch of U.S. Highway 12/287 from Shephard Way in Helena to Wylie Drive in East Helena. Phase 1 of the project completed in May 2018, MDT installed concrete barriers on the bridge to prevent drivers from crossing the roadway centerline.

Phase 2 of the project, which is scheduled to begin in July 2018, will include the construction of a raised median installed before and after the road curves near the bridge; bridge improvements that include repairs to the concrete driving surface and a friction treatment to enhance traction; and the installation of overhead lighting to improve driver visibility.

Project Timeline

Phase 2 of project construction is slated to begin the week of July 9, 2018 and end around the first week of November 2018. Some construction items, such as striping, may be completed in the spring of 2019.

Project Map

East Helena Viaduct project map
Click to view a larger image of the project map.

Impacts to the Public

Do the Zipper Merge!
The MDT is going to use the traffic control method called the zipper merge during peak travel times to ensure that traffic moves as fluidly as possible through the construction area. MDT will install ample signage to direct drivers to properly use zipper merging. View a video on how the zipper merge works.

The public can expect reduced speeds, single lane traffic, and should plan for extra travel time of 10 to 15 minutes in the area.

There is also a 12-ft width restriction in place until the end of construction in November 2018.

For the most up-to-date travel information be sure to check the MDT Construction Report (look for US-12 - from Shephard Way in Helena to Wylie Drive in East Helena).