US-12 between Junction Interstate 90 at Garrison and Helena including MacDonald Pass

Road Conditions:

Road conditions as of 10:15 PM MDT on Monday, July 15 are as follows: dry. Actual road conditions may vary from this report. Motorists are cautioned to be alert to changing conditions.


The following construction project is in effect: overlaying between 6.25 miles east of MacDonald Pass and 6.50 miles west of Junction Interstate 15 and US 287 South-Helena including delays up to 15 minutes and reduced speed (travelers can expect single lane closures and single lane traffic).


The forecast until 4:00 AM MDT on Tuesday, July 16: Skies will be mostly cloudy. Visibility will be ten miles changing to five miles in haze. There will be occasional thunderstorms changing to scattered very light rain. Winds will be calm. Temperatures will range from 52 to 64 F changing to 46 to 58 F.