(UPDATE, 10:55 a.m.) A snow and rain shower just came through the area, settling the dust and improving visibility. The MDT has flaggers in place and are letting traffic through at this time.
The also said that for now, S-228 to Highwood remains open and US 89 from Great Falls to Belt remains open.
(1st REPORT, 10:32 a.m.) The Montana Department of Transportation reports that US Highway 87 has been closed due to poor visibility caused by blowing dirt and dust.
The MDT says that road is closed at mile marker 14, about 12 miles north of Great Falls, near the Cascade/Chouteau county line, and that barricades are in place.
In addition, MDT says that blowing dirt is causing poor visibilty along US Highway 80 between Fort Benton and Geraldine.
The MDT recommend that drivers turn on their headlights, reduce their speed, and use caution.
The Montana Department of Transportation closed most of the road for several hours on Monday due to near-zero visibility caused by blowing dust and at least one crash. The road was open on Tuesday, but MDT cautioned drivers to be careful due to blowing dust.