We ran into this one by chance. Got rained out at one spot and just started driving. Chateau is a cute little town with a grocery store, laundry mat, and some places to eat.

This camp ground it right out of town. Easy access. And internet.

Small no frills campground.

The gem is the reservoir access. Esp if it is earlier in the year and the river's are high. You can go here to get your feet wet earlier in the season.

Also convenient of you are on you way to Glacier. The view here never gets old.