That sounds about right. While I can't vouch for ID roads, the highway from Idaho Falls to West Yellowstone and then on to Big Sky/Bozeman is a major thoroughfare - it gets plowed and sanded regularly. Lots and lots of truck traffic.
It isn't impassable by any means whatsoever, but do take it easy. Several fatal car accidents in that canyon...just be mellow. Speeding on icy twisty roads with all sorts of truck traffic = a bad idea. Amazing some people can't get that (myself included at times!).
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