UPDATE 11:15am
Wrecker crews will be working on clean-up and removal for the remainder of the day and possibly after dark. Please use the alternate route through West Yellowstone if you are traveling to Eastern Idaho.
08:30am
Emergency crews from Madison County and Hebgen Basin are responding to a vehicle roll over crash near Reynolds Pass on Montana 87. A wrecker recovery team will be working in the area for an extended period of time and may cause delays. Please use US Highway 287 through the Quake Lake area to travel south into Idaho.
Original source can be found here.