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

Road Conditions:

Road conditions as of 9:00 AM MDT on Sunday, March 29 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: guardrail work between 6.25 miles east of MacDonald Pass and 6.50 miles west of Junction Interstate 15 and US 287 South-Helena including reduced speed limited to 35 MPH (travelers can expect single lane closures).


The forecast until 3:00 PM MDT on Sunday, March 29: Skies will be mostly clear becoming overcast. Visibility will be ten miles changing to five miles. There will be widely scattered very light snow changing to scattered very light rain. Winds will be 4 mph from the south-southwest changing to 9 mph gusting to 18 mph from the southwest. Temperatures will range from 27 to 37 F changing to 40 to 58 F.