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

Road Conditions:

Road conditions as of 7:30 PM MDT on Thursday, September 19 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: chip sealing between 6 miles west and 1.25 miles west of Junction Montana 141-Avon including delays up to 15 minutes, flaggers present, and reduced speed (travelers can expect loose gravel, grooved road surface, a pilot car in use, single lane traffic, and fresh oil). Motorcycles should consider alternate route.


The forecast until 1:00 AM MDT on Friday, September 20: Skies will be mostly cloudy becoming overcast. Visibility will be five miles. There will be continuous light rain changing to scattered very light rain. Winds will be 4 mph from the west-northwest. Temperatures will range from 44 to 58 F changing to 37 to 51 F.