Montana Department of Transportation

ROUNDABOUTS

About Roundabouts

Purpose for Roundabouts

History of Roundabouts

How to Use a Roundabout

Roundabouts in Montana

Currently there are three single-lane roundabouts in operation on the state highway system:

In Montana City at the intersection of Jackson Creek Road and Colonial Drive (Secondary 282 and Secondary 518).
Off the new South Helena Interchange at the intersection of Saddle and Colonial drives in Helena.
On the West Reserve Loop at the intersection of Stillwater and West Reserve drives in Kalispell.

Several multilane roundabouts are in the planning stages for the Billings area.