Eric from KCMO on 9/2/2025 3:36:11 PM:
I would suggest avoiding the trail and anywhere within 100 miles of it during the Sturgis motorcycle rally and probably one week before and after. I have no problem with the riders or rally, you should realize the event draws hundreds of thousands of people to the region. This influx will crowd the attractions, any/all camping or lodging, restaurants, etc. Many will bring or rent side by side ATVs and those are lawfully on the roads, highways and may often cross the trail. It just seems like you’ll have a better Mickelson experience by planning around Sturgis. Again, I’m not opposed and I hope they also have a great experience. The rally brings a great deal of revenue to the state. It’s usually the first full week of August, but use your google skills to verify. 
I don’t recall seeing many posts about snakes in general, but if you are paying attention they should be easy to see and thus avoid. 
The Mick crosses under the paved driveway leading to the Crazy Horse Memorial. It’s worth riding up to and touring the museum. They charge a vehicle admission fee, including bikes. In the parking lot there is a highly visible bike rack across from the museum entrance. 
I rode southbound on a Thursday and Friday in late august, trail traffic was light. I had a good experience at Chalet Motel. Don’t miss Purple Pie Place.